P P P P P NO SUBJECT DATE EFFECTIVITY

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1 SERVICE LETTER INDEX The following is a numerical list of all active Service Letters. Check Effectivity column for Service Letters applicable to your aircraft Model. Those not included are obsolete and will not be reissued. C C C C C 1 X CARBURETOR AIR FILTER SERVICE NOTES Jun-53 MODEL 520 AND X COWL ATTACH ANGLE REINFORCEMENT Jun-53 MODEL X INSTALLATION-ENGINE-DRIVEN HYDRAULIC... 6-Aug-53 MODEL 520 AND VACUUM PUMPS 4 X PROPELLER FEATHERING Aug-53 MODEL 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), X INSPECTION AND ADJUSTMENT OF MIXTURE Sep-53 MODEL 520 AND 560 CONTROL LINKAGE 6 X MIXTURE CONTROL OPERATION Sep-53 MODEL X REDUCTION OF DRAFTS IN FORWARD SECTION... 9-Dec-53 MODEL 520 S/N 1 THRU 74, 76 OF CABIN BY SEALING NOSE WHEEL WELL THRU 99, 101 THRU 103, 105 THRU 108, 110, 112, 114 AND X LYCOMING S.B Jan-54 MODEL X INSPECTION OF WHIP ANTENNAS Jan-57 MODEL X PROCEDURE FOR SERVICING MAIN LANDING Mar-54 MODEL 520 AND 560 GEAR STRUTS 15 X RESTARTING OF ENGINES AFTER... 8-Apr-54 MODEL 520 AND 560 SHUTDOWN DURING FLIGHT SUP. NO. 1 (4/30/54) 17 X THROTTLE OPERATING PROCEDURE Apr-54 MODEL 520 AND X REPLUMBING OF VACUUM GAUGE PIPING... 7-Jun-54 MODEL 520 S/N 1 THRU 135, 137, 138, 141, 143 AND X RE-RIGGING OF ELEVATOR CONTROL LINKAGE Aug-54 MODEL 520 TO OBTAIN MORE CLEARANCE BETWEEN CONTROL WHEELS AND FRONT SEATS 25 X EFFECT OF NEW GRID TYPE AIR Oct-54 MODEL 520 STRAIGHTENER (REF. S.B. 25) 26 X INSPECTION OF FUEL VENT LINES Oct-54 MODEL 520 AND 560 S/N 21 THRU X DAMAGE TO NOSE WHEEL DRAG LINK SUPPORT... 5-Nov-54 MODEL 520 AND 560 S/N 1 THRU STRUCTURE AND RH WALL OF NOSE WHEEL 190 WELL 28 X USE OF JACOB GASKET NO. 763 FOR Nov-54 ALL MODEL 520 WHICH HAVE MOUNTING HYDRAULIC PUMP EXPERIENCED OIL LEAKS AT HYDRAULIC PUMP MOUNTING PAD. 29 X PERIODIC REPLACEMENT OF HYDRAULIC Nov-55 MODEL 520 SYSTEM FILTER CARTRIDGE 30 X FORWARD SEAT TRACK STOPS Jan-55 MODEL 520 AND X INSPECTION AND MODIFICATION OF MAIN... 3-Feb-55 MODEL 520 AND 560 S/N 1 THRU LANDING GEAR DOWNLOCK VALVE X RELOCATION OF CYLINDER HEAD... 2-Mar-55 MODEL 560 S/N 155 THRU 198 TEMPERATURE THERMOCOUPLE AND X INSPECTION AND REPAIR OF OUTBOARD Jun-55 MODEL 520 AND 560 AILERON HINGE BRACKETS 38 X REVISED FLAP OPERATING PROCEDURE Aug-55 MODEL 520, 560 AND 560A 39 X INSPECTION AND REPAIR OF AFT FUSELAGE... 8-Oct-58 MODEL 560A AND 560E STRINGER AND FRAME 43 X FRONT ENGINE MOUNT FITTING RETAINING NUT Jan-56 MODEL 560A S/N 231 THRU X NOSE LANDING GEAR CYLINDER ASSEMBLY... 3-Feb-56 MODEL 560, 560A AND 680 SPACER INSTALLATION WITH ELECTROL NOSE GEAR 46 X USE OF CARBURETOR HEAT Mar-56 MODEL 520, 560 AND 560A 47 X USE OF FUEL BOOST PUMPS May-56 ALL MODELS 49 X INSPECTION OF RUDDER TRIM TAB FLEX CABLE... 5-Jun-56 MODEL 560A AND 680 S/N 296 THRU X SUP. 1 INSPECTION REPLACEMENT AND Oct-58 MODEL 560A, 560E AND 680 S/N ADDITION OF FRAME CLIPS IN THE RIGHT 231 THRU 610 AND LEFT NACELLES 54 X IMPORTANCE OF POWER ENRICHMENT AS... 1-Oct-56 MODEL 680 APPLIED TO MODEL 680 AERO COMMANDER TC187 REVISED FEBRUARY 2011 PAGE 1 OF 17

2 56 X INSPECTION OF SEAT BELT ATTACHMENT... 4-May-57 MODEL 520, 560, 560A, 560E AND X INSPECTION OF FLAP AND LANDING GEAR... 4-May-57 ALL MODELS S/N 1 THRU 570 SELECTOR HANDLES 62 X INSTALLATION OF LARGER OIL COOLER GILL Nov-57 MODEL 560A, 560E AND 680 MOUNTED ON LOWER HALF OF ENGINE EQUIPPED WITH GO-480-G1B6 COWLING OR GSO-480-B1A6. 63 X MAXIMUM OIL INLET TEMPERATURES FOR Nov-57 MODEL 560A AND 560E WITH ENGINES LISTED EQUIPPED GO-480-G1B6, AND MODEL 680 EQUIPPED GSO-480-B1A6 64 X ROLL PIN REPLACEMENT--MAIN LANDING GEAR Dec-57 MODEL 560A S/N 231 THRU 499 DRAG BRACE LINK 65 X CABIN HEATER CYCLING SWITCH ADJUSTMENT Dec-57 MODEL 520, 560, 560A AND 680 S/N 75, 88, 100, 131 THRU X PROPELLER GOVERNOR ANTI-ICING SHIELD Dec-57 MODELS WITH WOODWARD PROPELLER GOVERNORS MOUNTED ON ENGINE REDUCTION GEAR HOUSING 67 X ENGINE THROTTLE BRACKET MOUNTED ON Dec-57 MODEL 680 S/N 231 THRU 490 SUPERCHARGER HOUSING 69 X RIB REPAIR--INBOARD FLAPS... 6-Mar-58 MODEL 560A, 560E AND 680 S/N 231 THRU X SKIN CRACKS--UPPER WING SURFACE... 9-May-58 MODEL 560A, 680 AND 560E S/N 231 AND SUBS 71 X RECOMMENDED ENGINE OIL CHANGE TIME May-58 MODEL 560E, 680E AND X INBOARD RIB REPAIR-NACELLE CLOSEOUT... 4-Jun-58 ALL MODELS S/N 231 THRU X INSPECTION OF THROTTLE CONTROL CABLE... 8-Oct-58 MODEL 560A AND 560E S/N 312 AND THROTTLE CONTROL ROD END THRU 630..ATTACHING BOLT 75 X MODIFICATION-ENGINE OIL BREATHER SYSTEM... 3-Mar-59 ALL MODELS S/N 231 THRU X SECURING MAIN LANDING GEAR DOWN LOCK... 9-Mar-59 ALL MODEL 500, 560E, 680, 680E, SWITCH WIRES 720, UP TO AND INCLUDING S/N A X X CRACKING OF THE LANDING GEAR TRUSS Oct-60 ALL MODELS S/N 231 THRU 892 ATTACH ANGLE EXCEPT X GENERATOR BLAST TUBE POSITIONING Jun-59 MODEL 500 S/N 618 THRU X INSPECTION OF MANIFOLD AND OIL PRESSURE Jun-59 ALL MODELS S/N 231 THRU 749 LINES AT FUSELAGE STATION X BATTERY RELAY TERMINAL INSULATION Jun-59 MODEL 500, 560E AND 680 S/N 671 THRU X REMOVAL OF THE FUSELAGE NOSE Nov-59 MODEL 520, 560, 560A, 560E, 680, CAP SCREEN 680E, AND 500 S/N 75, 100, 131 AND SUBS 82B X X ICE SHIELDS INSTALLATION Oct-66 ALL PROP-DRIVEN MODELS REV. NO. 1 (1/15/69) AND REV. NO. 2 (7/24/70) 84 X X IMPROVEMENT OF STARTER AND MAGNETO... 3-Mar-60 ALL MODELS S/N 231 THRU 893 SWITCH INSTALLATION EXCEPT 871 AND X COMPLIANCE WITH WOODWARD Jun-60 ALL MODELS EQUIPPED WITH GOVERNOR CO. S.B WOODWARD GOVERNORS MODEL (CHANGE LETTERS N THRU AC) AND MODEL (ORIGINAL THRU E) 86 X X SCINTILLA S.B. 434B Jun-60 ALL MODELS EQUIPPED WITH S6-20, -21 AND S6L/RN-200, -201, -201, -204 AND -205 MAGNETOS 87A X X INSPECTION AND REPAIR OF AILERON AND Oct-62 ALL MODELS S/N 1 THRU 1776 ELEVATOR HINGE BRACKETS AND FORWARD SPARS 88 X X GOODYEAR SERVICE INFORMATION LETTER Aug-60 MODEL 680, 680E, 560E, 720, MODEL 560A, 500, 500A WITH 3-SPOT GOODYEAR BRAKES 89 X REPLACEMENT OF 1M12-G PROP GOVERNOR Aug-60 MODEL 500 WITH WOODWARD PART NO X X TORQUING OF AN737TW CLAMPS LOCATED... 6-Oct-60 ALL MODELS WITHIN FUEL AND OIL CELLS PAGE 2 OF 17 REVISED DECEMBER 2002

3 91 X INSPECTION OF TE332 TYPE 11 INDIVIDUAL... 8-Dec-60 MODEL 520 AND 560 S/N 1 THRU RECLINING SEATS X SERVICING MAIN LANDING GEAR ACTUATING... 8-Dec-60 ALL MODELS S/N 231 THRU X INSTALLATION OF IMPROVED GENERATOR... 8-Dec-60 MODEL 500A S/N 893 THRU 980 DRIVE PULLEY RETAINING NUT 94 X INSTALLATION OF CORRECTLY CALIBRATED... 8-Feb-61 MODEL 680F S/N 920 THRU 990 OIL DIPSTICK AND IMPROVEMENT OF WEIGHT LESS 958, 966, 968, 972, 975, AND BALANCE DATA AND X INSTALLATION OF FUEL FLOW GAGE PITOT VENT Apr-61 MODEL 500B S/N 893 THRU X INTERPRETATION AND CALIBRATION OF DUAL May-61 MODEL 520 S/N 1 THRU 130 SCALE FUEL QUANTITY GAGE 98A X X INSPECTION AND MODIFICATION OF May-63 ALL MODELS S/N 871, 875 AND UPPER NACELLE 891 THRU X X LYCOMING S.B May-61 MODEL 500 AND 500B 101 X CHANGE OF PROPELLER BLADE Jun-61 MODEL 500B S/N 893 THRU 1014 FEATHERED PITCH ANGLE LESS X INSPECTION AND INSTALLATION INSTRUCTIONS... 6-Jul-61 MODEL 560F AND 680F --HARTZELL PROPELLER 103 X MODIFICATION OF ENGINE COOLING SYSTEM Jul-61 MODEL 680F S/N 871 THRU 1059, PART I, II, III LESS 925, 928, 934, 935, 937, 938, 939, 942, 944, 945, 953, 956, 958, THRU 972, 986, 988, 991, 1000, 1001, 1003, 1005, 1016 THRU 1019, 1021 THRU 1050 PART IV Jul-61 MODEL 680F S/N 871 THRU X HORIZONTAL STABILIZER MODIFICATION Aug-61 MODEL 680F S/N 871 THRU 1064, LESS 934, 1016 AND X IMPORTANCE OF MAIN LANDING GEAR Aug-61 MODEL 500A, 500B, 560F AND SERVICING 680F 106 X X ELIMINATION OF THE SUPERCHARGER BEARING Aug-61 MODEL 680, 680E AND 680F THERMOCOUPLE & ASSOCIATED EQUIPMENT ON COMMANDERS WITH LYCOMING GSO-480-A1A6, GSO-480-B1A6, & IGSO-540B1A ENGINES 107 X HARTZELL PROPELLER BULLETIN NO Aug-61 MODEL 500 EQUIPPED WITH 1M12 HAMILTON-STANDARD GOVERNORS 108 X PROTECTION OF ENGINE DURING INCLEMENT Aug-61 MODEL 500A, 500B, 560F AND WEATHER 680F S/N 871 AND SUBS 109 X INSPECTION OF FUEL SYSTEM DRAIN TUBING Aug-61 MODEL 520 AND 560 S/N 1 THRU X X GOODYEAR SERVICE BULLETIN DATED Oct-61 MODEL 680, 560E, 680E, 720, 26-SEP-61 AND ON 560A, 500, 500A, 500B, 560F AND 680F EQUIPPED WITH GOODYEAR 24X7.7 WHEEL ASSY. 111 X INSPECTION AND REPAIR OF AFT OUTBOARD Oct-61 MODEL 500A, 500B, 560F AND COWL DOORS 680F S/N 871, 875 AND 893 THRU X X REPLACEMENT OF TEE FITTING IN VACUUM Oct-61 ALL MODELS S/N 231 THRU 1088 LINE AFT OF FUSELAGE STATION EQUIPPED WITH GOODRICH TYPE LIGHT WEIGHT DEICER SYSTEM 113 X X REPAIR OR REPLACEMENT OF BATTERY Oct-61 ALL MODELS EQUIPPED WITH MANIFOLD VENT NIPPLE AC-78 EXIDE BATTERIES 114A X X INSPECTION OF RUDDER AND ELEVATOR Jun-62 ALL MODELS S/N 151 THRU X X GROUND OPERATIONAL CHECK OF FUSELAGE Oct-61 ALL MODELS SO EQUIPPED NOSE CAP AND/OR FUEL VENT HEATERS 116 X INSPECTION AND REPLACEMENT OF ENGINE Dec-61 MODEL 500B, 560F AND 680F S/N EXHAUST STACK ASSEMBLIES 871 THRU X REPLACEMENT OF VACUUM AIR-OIL Dec-61 MODEL 500A S/N 951 THRU 1125, SEPARATOR 500B S/N 929 THRU 1125, 560F AND 680F S/N 893 THRU X INSPECTION AND REPLACEMENT OF ENGINE... 7-Feb-62 MODEL 500A AND 560F S/N 871 INDUCTION AIR CONTROL VALVES AND THRU 1170 MOUNTING SHAFTS 119 X HARTZELL PROPELLER BULLETIN NO Feb-62 MODEL 500B S/N 893 THRU X INSPECTION/REPAIR OF UPPER NACELLE Mar-62 MODEL 500A, 500B, 560F AND SKIN 680F 121 X MODIFICATION OF LEAR-ROMEO ENGINE Mar-62 MODEL 500B, 560F S/N 893 THRU DRIVEN FUEL PUMPS-MODEL RG 9080 SERIES 1166 REVISED DECEMBER 2002 PAGE 3 OF 17

4 122 X BENDIX S.B. NO Mar-62 MODEL 500B, 560F S/N 893 THRU X INSPECTION AND REPLACEMENT OF CIRCUIT... 4-May-62 MODEL 520, 560, 560A, 560E, 500 BREAKER PANEL INSULATOR AND 680 S/N 1 THRU X X ELEVATOR TORQUE TUBE-INSPECTION AND MOD.. 1-Jun-62 ALL MODELS S/N 1 THRU X X INSTALLATION OF ANTI-SPRAY BAFFLE IN... 1-Jun-62 ALL MODELS S/N 151 THRU 1250 AFT FUSELAGE EQUIPPED WITH SP-3 AUTOPILOT 126 X LYCOMING S.B. NO Jul-62 MODEL 500B AND 560F 128 X X BATTERY OVERBOARD DRAIN ASSY Aug-62 ALL MODELS S/N 1 THRU X X INSPECTION OF MAIN LANDING GEAR TRUSS Aug-62 ALL MODELS S/N 231 THRU 892, AT ENGINE FIREWALL LESS 871 AND X X INSPECTION--MAIN LANDING GEAR ACTUATING... 7-Sep-62 ALL MODELS S/N 871, 875 AND CYLINDER BODY 893 THRU X INCREASED ENGINE OIL PRESSURE GAGE LIMITS.. 12-Sep-62 MODEL 500B 132 X IMPROVED ENGINE SHUTDOWN PROCEDURES Sep-62 MODEL 680F AND 680F(P) 133 X HARTZELL S.L. NO Sep-62 MODEL 500A S/N 875 THRU X POSITIVE ATTACHMENT OF ENGINE Sep-62 MODEL 500 S/N 618 THRU 892 INDUCTION AIR BOX CONTROL ARMS TO CONTROL ARM SHAFTS 135 X X INSPECTION--MAIN LANDING GEAR DRAG Nov-62 ALL MODELS S/N 871, 875 AND BRACE CLEARANCES 893 THRU X X MOISTURE DRAIN HOLES FOR ELECTRICAL... 2-Jan-63 ALL MODELS S/N 875, 893 THRU WIRING BUNDLES 1266, EXCEPT 1190, 1216, 1228, 1235, 1236, 1243, 1244, 1246, 1252, 1262 AND A X ENGINE CRANKCASE BREATHER... 8-Feb-63 MODEL 500A, 500B, 560F, 680F MODIFICATION AND 680F(P) S/N 875, 893 AND SUBS 138 X INSPECTION AND/OR REPLACEMENT OF Feb-63 MODEL 560F, 680F AND 680F(P) ENGINE ALTERNATE AIR DUCTS S/N 871, 893 THRU 1260, EXCEPT 920, 1206, 1216, 1220, 1228, 1234, 1236, 1238, 1243, 1244, 1246, X USE OF ENGINE ALTERNATE AIR DURING COLD Feb-63 MODEL 680F AND 680F(P) WEATHER OPERATION 141 X X INSPECTION AND REPAIR OF RUDDER PEDAL... 8-May-63 ALL MODELS S/N 1 THRU 1070 HORN ASSEMBLY 142 X X INSPECTION AND REPAIR OF OUTBOARD May-63 ALL MODELS S/N 231 AND SUBS AILERON WING HINGE BRACKETS 143 X INSPECTION AND REPAIR OF ENGINE MOUNT... 4-Jun-63 MODEL 520 AND 560 S/N 1 THRU BEAM ASSEMBLY X INSPECTION AND REPAIR OF LOWER ENGINE... 1-Jul-63 MODEL 500A, 500B, 560F, 680F COWLING AND 680F(P) 145 X INCREASING SIZE OF RIVETS IN WINDSHIELD... 6-Aug-63 MODEL 680F(P) S/N 875 THRU CENTER POST X CORROSION OF UPPER ENGINE NACELLE... 6-Aug-63 MODEL 500A, 500B, 560F, 680F SURFACES AND 680F(P) 147 X RESETTING FUEL BOOST PUMP PRESSURE... 7-Aug-63 MODEL 680F, 680F(P) AND 680FL S/N 871 THRU A X X GOODYEAR S.B. DATED 18-Jun May-72 MODEL 500, 500A, 500B, 500S, 500U, 560E, 560F, 680, 680E, 680F, 680FL, 720, AND 680FL(P) EQUIPPED WITH GOODYEAR WHEEL ASSY P/N , OR X FUEL SYSTEM MODIFICATION Sep-63 MODEL 500A S/N 871 THRU X UNITED SYSTEMS CORP. REPORT NO Sep-63 MODEL 680F(P) S/N 871 THRU X X INSPECTION OF ENGINE FUEL PRIMER... 3-Jan-64 ALL MODELS THRU S/N 1390 SWITCHES AND INSTALLATION OF SWITCH EQUIPPED WITH ENGINE FUEL GUARDS PRIMER SYSTEMS 153 X BENDIX SCINTILLA S.B. NO Jan-64 MODEL 680F, 680F(P) AND 680FL S/N 871 THRU 1372, EXCEPT 1354, 1357, 1358, 1360, 1365, 1366, 1367, 1368, 1369, X ELIMINATION OF EXCESSIVE PROPELLER Jan-64 MODEL 500A, 500B, 560F, BLADE BEARING FRICTION PREPARED IN COMPLIANCE WITH HARTZELL S.L F(P) AND 680FL, EQUIPPED WITH MODEL HC-A2XF, HC-A3XK AND HC-B3Z30 PROPS PAGE 4 OF 17 REVISED DECEMBER 2002

5 156A X REPAIR OR REPLACEMENT OF LANDING GEAR Jan-65 MODEL 500A, 500B, 560F, 680F AND WING FLAP SELECTOR VALVE ARM AND AND 680FL S/N 1131 THRU 1450; COLLAR ASSEMBLIES, AND INSPECTING AND 680F(P) S/N 1048 THRU 1450 RIGGING OF SELECTOR VALVE 157 X X INSPECTION AND MODIFICATION OF ENGINE Mar-64 ALL MODELS S/N 871 THRU 1390 BREATHER VENT TUBE AND PLATE ASSY 158 X INSPECTION AND ADDITION OF RIVETS IN... 1-Apr-64 MODEL 500A, 500B, 560F, 680F, FUSELAGE FRAMES AT STATION F(P), AND 680FL S/N 871 OR THRU 1397, EXCEPT 1324, 1376, 1382, 1385, 1391, 1395, X X INSPECTION AND REPAIR OF FUEL CELL Apr-64 ALL MODELS S/N 1 AND SUBS FILLER CAPS 160 X INSPECTION AND MODIFICATION OF OIL May-64 MODEL 560F, 680F, 680F(P), COOLER VERNATHERM VALVE AND OUTLET 680FL S/N 893 THRU 1330 PORT FITTING 161 X X FUEL PRESSURE FLUCTUATION DUE TO... 1-Jun-64 ALL MODELS EQUIPPED WITH PRESENCE OF VAPOR IN FUEL SUPPLY FUEL INJECTION ENGINES HARTZELL S.L X HARTZELL S.L. NO. 36, DATED 3-Aug Nov-64 MODEL 560F, 680F, 680F(P) AND REVISION NOTICE ( ) INCORPORATED 680FL S/N 893 AND SUBS 163 X X BENDIX CORPORATION BULLETIN NO. 2268A Dec-64 ALL MODELS EQUIPPED WITH M-4B AUTOPILOT 164 X INSPECTION/REPAIR OF UPPER ENGINE MOUNT Jan-65 MODEL 500B S/N 871 THRU X INSPECTION AND MODIFICATION OF Jan-65 MODEL 680F(P) S/N 1048 THRU HYDRAULIC RESERVOIR DIPSTICK X BATTERY VENT INSTALLATION... 3-Feb-65 MODEL 500A, 500B, 560F, 680F AND 680FL S/N 871 THRU X AFT OUTBOARD COWL DOORS-INSPECTION May-65 MODEL 500A, 500B, 560F, 680F, AND REPAIR 680F(P), 680FL AND 680FL(P) THRU S/N X PROPELLER PITCH CONTROL ASSY-INSPECTION May-65 MODEL 500A 169 X COOLER INSTALLATION-ENGINE OIL May-65 MODEL 680F, 560F, 680F(P) AND 680FL S/N 893 THRU R X APPROVED FUELS AND OILS Dec-79 MODEL 680T, 680V, 680W, 681 AND A X MAIN CABIN DOOR MODIFICATION Jan-66 MODEL 680FL(P) S/N THRU X X X RECOMMENDED CABIN HEATER INSPECTION... 9-Dec-65 ALL MODELS EQUIPPED WITH TIMES JANITROL CABIN HEATERS 173 X INSPECTION, MOD AND/OR REPLACEMENT OF Dec-65 MODEL 560, 560A AND 560E S/N CARBURETOR AIR GRID ASSEMBLY 151 THRU X TAILLIGHT BULB REPLACEMENT Dec-65 MODEL 500A, 500B, 560F, 680F AND 680F(P) S/N 871 AND SUBS; MODEL 500U, 680FL AND 680FL(P) S/N 1261 THRU X INSPECTION OF AFT END OF EXHAUST STACK Jan-66 MODEL 560F AND 680F 177 X REROUTING OVERHEAD ELECTRICAL... 6-May-66 MODEL 680FL AND 680FL(P) S/N WIRING BUNDLE 1261 THRU X VENT INSTALLATION-CABIN SUPERCHARGER May-66 MODEL 680F(P) AND 680FL(P) HYDRAULIC MOTOR SN 871 THRU X X IDENTIFICATION OF O-RING SEALS May-66 ALL PROP-DRIVEN AIRCRAFT USING SKYDROL HYDRAULIC FLUID 180 X INSPECTION OF HYDRAULIC HIGH PRESSURE May-66 MODEL 680F(P) AND 680FL(P) LINES IN NACELLE AREA S/N 1048 THRU X ENGINE CONTROL ROD END MODIFICATION Jun-66 MODEL 500A, 500B, 560F, 680F, 680F(P), 680FL, 500U, 680FL(P) S/N 871 THRU X INSTALLATION OF NOISE SUPPRESSOR Jul-66 MODEL 680F(P) S/N 1048 THRU PRESSURIZATION OUTFLOW VALVE 1439; MODEL 680FL(P) S/N 1471 THRU X DC CONTACTOR BOX WIRING MODIFICATION Oct-66 MODEL 680T S/N 1532, 1534, 1538 THRU 1550, 1554 THRU, 1560, 1563 THRU 1571 AND X INSTALLATION OF IMPROVED CABIN... 4-Nov-66 MODEL 680T S/N 1532, 1534, PRESSURE DIFFERENTIAL SWITCH 1538 THRU 1550, 1554 THRU 1560, 1563 THRU 1571 AND X MODIFICATION OF EGT SYSTEM PITOT STATIC Nov-66 MODEL 680T S/N 1532, 1534, HOSE INSTALLATION 1538 THRU 1550, 1554 THRU 1560, 1563 THRU 1571 AND 1588 REVISED DECEMBER 2002 PAGE 5 OF 17

6 186 X X MAIN LANDING GEAR UPLOCK ARM MOD Nov-66 MODEL 500A, 500B, 500U, 680F, 680F(P), 680FL, 680FL(P) AND 680T S/N 871 THRU X OVERHEAD SWITCH PANEL BUS CIRCUIT Nov-66 MODEL 680T S/N 1473 THRU PROTECTION X INSULATION OF ENGINE BLEED SWITCH 8-Dec-66 MODEL 680T S/N 1473 THRU X PROPELLER ATTACH BOLTS Dec-66 MODEL 680T S/N 1473 THRU 1628 LESS 1519, 1552, 1575, 1579, 1581, 1583, 1593, 1601 THRU 1616, 1622 THRU 1626 THRU X X INSTALLATION OF IMPROVED ROLLER Dec-66 MODEL 500B, 500U, 560, 680F, BUSHING MAIN LANDING GEAR DOOR 680FL, 680FL(P) AND 680T S/N LATCH ASSY 1400 THRU X ENGINE COWLING CHAFING STRIP Jan-67 MODEL 680T S/N 1473 THRU 1601, 1612, THRU 1620, X DEFLECTOR INSTALLATION--NOSE LANDING Jan-67 MODEL 680T S/N 1473 THRU GEAR 1605, 1610, 1612, 1616, 1618, 1620, 1628, 1675 AND X INSTALLATION OF IO-540-EIB5 AND Jan-67 MODEL 500B, 560F, 680F, IGSO-540-B1C ENGINES EQUIPPED WITH 680F(P), 680FL, AND 680FL(P) 1200 SERIES MAGNETOS S/N 871 THRU X RIVET REPLACEMENT AT FUSELAGE FRAME Feb-67 MODEL 680T S/N 1473 THRU STATION 38.00, LEFT AND RIGHT SIDE 1605 AND 1610, 1612, 1618, 1620, 1628, 1675 AND D X FLIGHT INTO KNOWN ICING... 3-Aug-70 MODEL 680T, 680V, 680W AND X INVERTER WIRING MODIFICATION-EGT AND... 8-Mar-67 MODEL 680T S/N 1534 THRU HORSEPOWER INDICATING SYSTEMS 1550, 1554 THRU 1571, 1573 Rev 1 17 May 1967 THRU 1581, 1584 THRU 1601, 1610, 1612, 1616, 1618, 1620, 1628, 1675, 1676, 1684 AND A X X X APPROVED OILS FOR COOLING UNIT (BOOT... 7-Feb-68 MODEL 720, 680F(P), 680FL(P), STRAP) AND CABIN PRESSURIZATION 680T AND 680V SUPERCHARGER 199 X MODIFICATION OF ENGINE TAIL PIPE Mar-67 MODEL 680T S/N 1473 THRU MOUNTING X CABIN HEATER FUEL BOOST PUMP... 1-May-67 MODEL 680T S/N 1473 THRU MODIFICATION 1677, EXCEPT 1583, 1609, 1630, 1632, PLUS 1684, 1693, 1694, 1698 AND X X DIODE INSTALLATION--MASTER BATTERY May-67 ALL PROP-DRIVEN MODELS, SWITCH POLARITY PROTECTION EXCEPT MODEL 500U AND 680T 203 X X X RUDDER TORQUE TUBE DRAIN HOLE Jun-67 ALL MODELS S/N 2 THRU X X IMPROVED ELECTRICAL SYSTEM Oct-67 ALL MODELS S/N 1473 THRU X X EMERGENCY EXIT LATCH ASSY INSPECTION Nov-67 MODEL 680FL, 680FL(P), 680T AND 680V S/N 1261 THRU X ELECTRICAL PROPELLER DEICING SYSTEM Jan-68 MODEL 680T AND 680V WITH B.F.GOODRICH ELECTRIC PROP DEICING SYSTEM INSTALLED PRIOR TO JAN 23, X X MOD-MLG AND NOSE WHEEL INSTALLATION... 8-Apr-68 MODEL 500A, 500B, 500U, 560F, 680F, 680FL, 680F(P), 680FL(P), 680T, 680V AND 680W 208 X CONVERSION FROM TPE TO... 1-May-68 MODEL 680T AND 680V S/N 1473 TPE331-43A ENGINES THRU X INTERSTAGE BLEED AIR DUCT Jun-68 MODEL 680T, 680V AND 680W S/N 1473THRU X X X POWER BRAKE VALVE SUPPORT TUBE Oct-68 ALL MODELS THRU S/N 1799 ASSEMBLY INSPECTION 211 X X X NITROGEN STORAGE CYLINDER PRESSURE May-69 ALL MODELS S/N 871 THRU 1874 GAGE MODIFICATION 212A X X X REPLACEMENT OF NOSE GEAR POSITION Apr-86 ALL MODELS S/N 151 THRU 1850; INDICATOR SWITCHES MODEL 500S THRU S/N 1876; MODEL 680W THRU S/N X REPLACEMENT--ENGINE DRAIN MANIFOLD May-69 MODEL 680T, 680V AND 680W ASSY S/N 1473 THRU 1850 PAGE 6 OF 17 REVISED DECEMBER 2002

7 214 X X MOD. OF GOODYEAR BRAKE ASSEMBLIES May-69 ALL MODELS 500A, 500B, 500U, 560F, 680F; MODEL 500S THRU S/N 1866; MODEL 680FL THRU S/N 1837 EQUIPPED WITH GOODYEAR BRAKE ASSYS; MODELS 680T, 680V AND 680W THRU S/N 1838 EQUIPPED WITH GOODYEAR BRAKE ASSYS 215 X REPLACEMENT OF LEFT AND RIGHT... 7-Nov-67 MODEL 500B, 500U, 500S, 560F, STARTER RELAY AND EXTERNAL POWER RELAY IN MASTER CONTROL PANEL 680F AND 680F(P) S/N 871 THRU 3075; MODEL 680FL AND 680FL(P) S/N 1261 THRU X CABIN AIR FLOW IMPROVEMENT... 1-Dec-69 MODEL 680W S/N 1726 THRU X X X PRESSURIZATION DUCT ADAPTER FLANGES... 1-Dec-69 MODEL 720 S/N 501 THRU 892; MODEL 680F(P) S/N 871 THRU 1447; MODEL 680FL(P) S/N 1261 THRU 1854; MODEL 680T AND 680V S/N 1473 THRU 1720; MODEL 680W S/N 1721 THRU X X REPLACEMENT OF MAGNETO SWITCHES Jan-70 ALL MODELS S/N 1 THRU X INSTALLATION OF ALTERNATOR PLACARD... 4-May-70 MODEL 500B, 500U AND 500S AND DECAL AND REDLINING OF THE S/N 893 THRU 3109 AIRCRAFT VOLTAMMETERS 220 X X INSPECTION OF NOSE GEAR STRUT BEARING Jun-70 MODEL 500S S/N 3050 THRU ASSEMBLY INSTALLATION 3085 AND 3087; MODEL 680W S/N 1726 THRU 1850; MODEL 681 S/N 6001 THRU A X X INSPECTION OF PROPELLER ELECTRIC Dec-70 ALL MODELS EQUIPPED WITH DEICER BOOT LEAD WIRE STRAPS PROP ELECTRIC DEICER BOOTS, S/N 893 AND SUBS, EXCEPT MODEL 500A 222 X MODIFICATION OF MANIFOLD PRESSURE Jun-70 MODEL 500B, 500S AND 500U AND OIL PRESSURE HOSE INSTALLATIONS S/N 893 THRU 3085 AND 3087, EQUIPPED WITH 1200 SERIES MAGNETOS 223 X INSTALLATION OF AUTOPILOT AMPLIFIER Jun-70 MODEL 500S AND 500U S/N 1531 ACCESS DOOR & ELEVATOR SERVO CABLE THRU 3085 AND 3087, EQUIPPED GUARD PLATE WITH MITCHELL CENTURY 111 A/P SYSTEM 224 X MODIFICATION OF AFT FUSELAGE Jul-70 MODEL 681 S/N 6001 THRU 6042 PRESSURIZATION DUCT INSTALLATION 225A X X X INSPECTION OF ELEVATOR BUNGEE SPRINGS Jun-78 ALL MODELS S/N 1 THRU 1876; MODEL 500S S/N 3050 THRU 3099; MODEL 681 S/N 6001 THRU X PROPER PROCEDURE FOR DRAINING... 3-Aug-70 MODEL 680T, 680V, 680W AND ENGINE INLET SUMP X X X CHECKING OIL LEVEL OF COOLING UNIT... 3-Aug-70 MODELS 720, 680F(P), 680FL(P), (B00T STRAP) DURING PREFLIGHT 680T, 680V, 680W AND 681 INSPECTION 228 X INSTALLATION OF PROPELLER Aug-70 MODEL 680T, 680V AND 680W UNFEATHERING PUMP CHECK VALVE S/N 1473 THRU 1850 EQUIPPED WITH TPE331-43A OR TPE331-43BL ENGINES AND MODEL 681 S/N 6001 THRU X X INSPECTION--DOOR LOCKING SOLENOID Aug-70 MODEL 680FL, 680FL(P), 680T, SPRING 680V, AND 680W S/N 1471 THRU 1854; MODEL 681 S/N 6001 THRU A X X INSPECTION--RUDDER TORQUE TUBE Sep-70 MODEL 500S, 500U, 680FL, CHANNEL 680FL(P), 680W S/N 1751 THRU 3092; MODEL 681 S/N 6001 THRU X FUEL OCTANE STENCIL... 3-Sep-70 MODEL 520 AND 560 S/N 1 THRU 230 REVISED DECEMBER 2002 PAGE 7 OF 17

8 232 X INSTALLATION OF RUB STRIP ON ENGINE Sep-70 MODEL 680T, 680V AND 680W; MOUNT YOKE ASSYS AND IMPROVED MODEL 681 S/N 6001 THRU 6041 STARTER-GENERATOR AIR VENT CHUTE CLAMP 233 X INSTALLATION OF PROTECTIVE TAG ON Oct-70 MODEL 680T, 680V AND 680W MANIFOLD FUEL LINE S/N 1473 THRU 1850; MODEL 681 S/N 6001 THRU 6042 AND X X MODIFICATION OF POWER BRAKE VALVES Jan-71 MODEL 680F(P), 680FL(P), 680T, 680V, 680W; MODEL 500S S/N 1755 THRU 3107; MODEL 681 S/N 6001 THRU X MODIFICATION OF 70-AMPERE OR 100-AMPERE Feb-71 MODEL 500B, 500U, 500S S/N ALTERNATOR SYSTEM 893 THRU 3095, 3100 AND 3101, EQUIPPED WITH EITHER 70 -AMPOR 100-AMP ALTERNATOR SYSTEM 236 X ENGINE GAGE UNIT (AN5773-1) Feb-71 MODEL 680F, 680FL, 680F(P) AND 680FL(P) S/N 871 THRU X HEATER MODIFICATION... 3-May-71 MODEL 500S S/N 3050 AND 3076 THRU 3092, 3094 THRU 3097 AND X X X SEALING OF ELEVATOR RUDDER TRIM TAB Jun-71 ALL AERO COMMANDER MECHANISMS Rev 1 22 Nov 85 MODELS 239 X X INSPECTION OF RIVETS IN LOWER FORWARD Aug-71 MODEL 500S, 500U, 680FL, WING SPAR CAPS BETWEEN WS AND 680FL(P) AND 680W S/N 1731 WS REVISION NOTICE NO. 1 (11/4/71) THRU 1876; MODEL 500S S/N 3050 THRU 3056; MODEL 681 S/N 6001 THRU X SEPARATION OF ELECTRICAL WIRING FROM Oct-71 MODEL 500B, 500U AND 500S FUEL LINE S/N 893 THRU B X X FLIGHT INTO KNOWN ICING CONDITIONS Jun-72 MODEL 685 AND X FLIGHT INTO KNOWN ICING CONDITIONS... 9-Dec-71 MODEL 500A, 500B, 500U, 500S, 560F, 680F, 680FL, 680F(P) AND 680FL(P) 243 X INSPECTION OF HARDWARE ATTACHING B.F Dec-71 MODEL 680T, 680V, 680W AND GOODRICH 2E1285 LEAD STRAP CLAMPS 681 WITH B.F. GOODRICH PROPELLER DEICER INSTALLATION A X X INSTALLATION AND TORQUE VALUE CHANGE Jan-80 MODEL 500A, 500B, 500U, 680, FOR MAIN LANDING GEAR AXLE NUT AND LUBRICATION OF WHEEL BEARINGS 680E, 680F, 680F(P), 680FL, 680FL(P), 680T, 680V, AND 680W S/N 231 THRU 1850; MODEL 500S S/N 1755 THRU 3114; MODEL 681 S/N 6001 THRU 6061, 6063 THRU 6066; MODEL 690 S/N X RECONNECTION OF BAGGAGE COMPARTMENT Apr-72 MODEL 680T, 680V, 680W AND LIGHT POWER SOURCE X INSTALLATION OF DIODES May-72 MODEL 680T AND 680V EQUIPPED WITH AERO COMMANDER CUSTOM KIT #79A 247 X NEGATIVE TORQUE SENSE SYSTEM TEST May-72 MODEL 690 S/N THRU LIGHT X QUADRANT FACE PLATE... 6-Jun-72 MODEL 690 S/N THRU X REWORK OF MIXTURE CONTROL BELLCRANK... 9-Aug-72 MODEL 680F, 680FP, 680FL, MOUNTING BRACKET WHEN INSTALLING 680FL(P), S/N 871 THRU 1854 PESCO VACUUM PUMP P/N 3P207JJ 250 X REPLACE AFT MAIN LANDING GEAR DOOR Sep-72 MODEL 690 S/N THRU HINGE NUTS AND THRU X INSTALLATION OF STOPS ON LEFT AND RIGHT Sep-72 MODEL 681 S/N 6001 THRU 6072; PLENUM CHECK VALVES MODEL 690 S/N THRU X X RUDDER TRIM TAB ACTUATOR INSTALLATION Sep-72 MODEL 685 S/N THRU 12010; MODEL 690 S/N THRU X INSPECTION OF SCREW HOLES IN MAIN SPAR Oct-72 MODEL 690 S/N THRU SECURING FUEL TANK HANGER A X X X USE OF "PRIST" ANTI-ICING/BIOCIDAL FUEL... 5-Apr-73 ALL MODELS EXCEPT THOSE ADDITIVE MODELS WITH CONTINENTAL ENGINES PAGE 8 OF 17 REVISED DECEMBER 2002

9 255 X X X INSPECTION AND/OR REWORK OF FLAP Oct-72 MODEL 500, 500A, 500B, 500U, DRIVE PULLEY 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P), 720, 680T, 680V, 680W, 681 S/N 411 AND SUBS; MODEL 500S S/N 1755 THRU 3127; MODEL 685 S/N THRU 12004; MODEL 690 S/N THRU X AIRESEARCH HEATED PX AND PY Aug-73 MODEL 690 S/N THRU PNEUMATIC LINES 11014, THRU 11066, AND X WIRE AND FUSE SIZE CHANGE FOR HEATED Dec-72 MODEL 685 S/N THRU ENGINE PRIME 12005, 12007, 12008, THRU 12014, THRU X FUEL QUANTITY INDICATOR DECAL... 2-Jan-73 MODEL 685 S/N THRU X X X GOODYEAR S.B. 680T-1 DATED 12-May Jan-73 ALL MODELS EQUIPPED WITH GOODYEAR BRAKE ASSYS P/N , OR X QUADRANT FACE PLATE... 5-Jan-73 MODEL 685 S/N THRU X BATTERY INSTALLATION Jan-73 MODEL 685 S/N THRU X FUEL VENT CHECK VALVE INSTALLATION... 1-Feb-73 MODEL 690 S/N THRU Rev 1 2 Mar X NEW ITT DIAL READOUT INDICATOR... 6-Feb-73 MODEL 690 S/N THRU Rev 1 28 Feb 73; Rev 2 9 Apr X TORQUING OF NUTS ON BENDIX VACUUM Feb-73 MODEL 680T, 680V, 680W, 681 PRESSURE REGULATOR AND RELIEF VALVE AND 690 S/N THRU X X IMPROVED FUEL FILLER CAP GUARD... 4-Apr-73 ALL MODEL 680T, 680V, 680W AND 681; MODEL 685 S/N THRU 12019; MODEL 690 S/N THRU WITH FUEL FUEL FILLER CAP GUARDS INSTALLED 266A X ENGINE TEMPERATURE CONTROL Apr-73 MODEL 685 S/N THRU X CABIN TEMPERATURE CONTROL Apr-73 MODEL 690 S/N THRU X BOOST PUMPS RESISTOR INSTALLATION Apr-73 MODEL 685 S/N THRU X INCREASED LANDING GEAR EXTEND SPEED Jul-73 MODEL 685 S/N THRU X REPLACEMENT OF PILOT SIDE WINDOW... 7-Sep-73 MODEL 690A S/N THRU ASSY (AND ANY COPILOT SIDE WINDOW AND THRU ASSY WITH OPENABLE DOOR) 271 X INCREASED LANDING GEAR EXTEND SPEED Sep-73 MODEL 690 S/N THRU X BOB WEIGHT MODIFICATION Nov-73 MODEL 500S S/N 3156 THRU X OIL COOLER FLANGE REINFORCEMENT Dec-73 MODEL 685 S/N THRU INSTL X ENGINE INSPECTIONS... 4-Feb-74 MODEL 685 S/N THRU X IGNITION SYSTEM Feb-74 MODEL 690A S/N THRU 11143, THRU 11146, AND X STARTER-GENERATOR GROUND Mar-74 MODEL 680T, 680V AND 680W S/N 1473 THRU 1850; MODEL 681 AND 681B S/N 6001 THRU 6072; MODEL 690 AND 690A S/N THRU X REPLACEMENT OF GOVERNOR REVERSAL Apr-74 MODEL 685 S/N THRU LINKAGE X X SEALING OF NO. 750 CONNECTOR PLUG ON Jun-74 MODEL 500S S/N 3172 THRU LEIGH SYSTEMS ELT UNIT 3199; MODEL 685 S/N THRU 12062; MODEL 690A S/N THRU WITH LEIGH SYSTEMS P/N 7H-1 EMERGENCY LOCATOR KIT INSTALLED REVISED DECEMBER 2002 PAGE 9 OF 17

10 279 X AIR CONDITIONER OIL LEVEL CHECK... 9-Jun-74 ALL MODEL A X HARTZELL S.B. NO. 105A, DATED 7-Jun Jul-74 ALL MODEL 690 AND 690A 281 X X AVCO LYCOMING S.B. NO Jul-74 ALL MODELS EQUIPPED WITH BENDIX S-1200 SERIES MAGNETOS 282 X FUEL AND HYDRAULIC SHUT-OFF VALVES Aug-74 MODEL 690A S/N THRU SWITCH X X EMERGENCY EXIT DOOR Aug-74 MODELS 680FL, 680FL(P), 680T. 680V, AND 680W S/N 1474 THRU 1855; MODEL 681 S/N 6001 THRU 6072; MODEL 685 S/N THRU 12063; MODEL 690 AND 690A S/N THRU X GROUND BLOWER CONTACTOR Aug-74 MODEL 690A S/N THRU , 1144 THRU 11146, THRU X COOLING DUCT FOR TACHOMETER Sep-74 MODEL 685 S/N THRU GENERATOR X GROUND BLOWER CONTACTOR... 9-Oct-74 MODEL 690 S/N THRU X AVIONICS RESISTOR INSTALLATION Oct-74 MODEL 690A S/N 11104, 11105, 11106, 11109, 11110, 11111, 11114, 11115, 11124, 11126, 11131, 11134, 11140, 11141, AND X IMPROVED GENERATOR FIELD RELAY Oct-74 MODEL 690 S/N THRU A X X INSPECTION OF SHARC-7 ELT FOR CORROSION Dec-74 MODEL 500S S/N 3172 AND AND LEIGH SYSTEMS, INC. S.B. NO. 005 SUBS; MODEL 685 S/N THRU 12099; MODEL 690A S/N AND SUBS WITH LEIGH SYSTEMS SHARC-7 ELT WITH LITHIUM BATTERIES 290 X IMPROVED GENERATOR FIELD RELAY Nov-74 MODEL 690A S/N THRU X CABIN HEAT SYSTEM Nov-74 MODEL 690A S/N THRU X PROPELLER DEICER WIRING... 6-Dec-74 MODEL 690 AND 690A S/N THRU X TURBO PROP ENGINE FUEL PURGE SYSTEM Feb-75 MODEL 690 AND 690A S/N THRU X STC SA 1926SW EPA KIT Feb-75 MODEL 680T, 680V, 680W AND X PROVISION FOR BORESCOPE INSPECTION... 2-Jan-75 MODEL 690 AND 690A WITH ENGINE S/N's AS DEFINED BY AIRESEARCH S.B. NO. TPE X X WOODWARD GOVERNOR CO. S.B. NO Jan-75 MODEL 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680FL, 500B, 500U, 500S, AND 720 EQUIPPED WITH WOODWARD PROP GOVERNOR P/N , , , OR X X RADAR RECEIVER/TRANSMITTER COVER Jan-75 MODEL 690A S/N THRU INSTALLATION 11199; MODEL 685 S/N THRU WITH RDR 1200, RDR140, AVQ-21, AVQ-47 OR AVQ-55 RADAR RECEIVER/ TRANSMITTER UNIT INSTALLED 298 X X INSTALLATION OF GENERATOR OVERVOLTAGE Feb-75 MODEL 685 S/N THRU RELAY 12063; MODEL 690 S/N THRU X INSTL OF PRESSURIZATION DUCT CLAMPS Mar-75 MODEL 690A S/N THRU X INSTALLATION OF GTS1O-520-K ENGINES Jul-75 MODEL 685 S/N THRU PAGE 10 OF 17 REVISED DECEMBER 2002

11 301 X MOD OF COLLINS RADIO AP-106 AUTOPILOT Jun-75 MODEL 690A S/N THRU EQUIPPED WITH COLLINS RADIO AP-106 AUTOPILOT 302 X HEATER OVERHEAD SWITCH INSTALLATION... 3-Jul-75 MODEL 500S S/N 3076 THRU X FUEL FLOW INDICATOR MODIFICATION Jul-75 MODEL 685 S/N THRU X X CORRECTION OF INERTIA LOAD MARKINGS ON Aug-75 MODEL 685 S/N THRU SEAT TAGS 12066; MODEL 690 AND 690A S/N S/N THRU WITH FOLLOWING SEATS, MFG BY CUSTOM PRODUCTS CO. MODEL NO'S 5800-PILOT & COPILOT HEIGHT ADJUSTABLE, 5810-SINGLE CABIN, THREE-PLACE DIVAN, 5830 LAVATORY AND 5840 PILOT AND COPILOT STANDARD 305A X RAM AIR DUCT PRESSURE SWITCH Aug-81 MODEL 690 S/N THRU INSTALLATION HAVING COMPLIED WITH REVISION NOTICE NO. 1 (10/31/75) GULFSTREAM S.L. NO. 267; MODEL 690 AND 690A THRU 11248, THRU X INDUCTION AIR DOOR MODIFICATION... 2-Dec-75 MODEL 685 S/N THRU X CABIN COLD AIR DUCT CONNECTOR MOD Jan-76 MODEL 690A S/N AND THRU X PROP UNFEATHERING PUMP WIRING CHANGE Mar-76 MODEL 690 AND 690A S/N THRU A X INCREASED WATTAGE PITOT HEAD... 4-Feb-77 MODEL 690 AND 690A S/N THRU A X X SEAT HEADREST SPRING RETAINER INSTL Oct-76 MODEL 685 S/N THRU 12066; MODEL 690 AND 690A S/N THRU EQUIPPED WITH CUSTOM PRODUCTS CO. AFT FACING SEAT P/N AND 5810 WITH ADJUSTABLE HEADREST 311 X GENERATOR CONTROL CIRCUIT Jun-76 MODEL 690A S/N THRU X CABIN TEMPERATURE SENSING ELEMENT... 2-Jul-76 MODEL 690A S/N AND 1269 REPLACEMENT THRU X CIGARETTE LIGHTER RESISTOR WIRING Sep-76 MODEL 680T, 680V AND 680W SECURITY S/N 1473 THRU 1850; MODEL 681 S/N 6001 THRU X IMPROVED OPERATION OF START PRESSURE Jul-77 MODEL 690A AND 690B S/N REGULATOR THRU A X MAIN LANDING GEAR DRAG BRACE PRELOAD Jan-78 MODEL 690, 690A AND 690B S/N ADJUSTMENT AND SUBS 317 X X X INSPECTION AND MODIFICATION OF RUDDER Apr-78 MODEL 500, 500A, 500B, 500S, AND ELEVATOR TRIM SPROCKET ASSEMBLY 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P), 680T, 680V, 680W, 681, 685 AND 720; MODEL 690 AND 690A S/N AND X INSPECTION AND SECURING OF AFT FUSELAGE May-78 MODEL 690A AND 690B S/N WIRE BUNDLE THRU X X INSPECTION OF MAIN LANDING GEAR TORQUE Jun-78 MODEL 500A, 500B, 500U, 500S, LINK PIN RETAINING BOLT 560F, 680F(P), 680FL, 680FL(P), 680T, 680V, 680W S/N 871 THRU 1876 AND S/N 3050 AND SUBS; MODEL 681 AND 685; MODEL 690, 690A AND 690B S/N AND SUBS. 320 X RELOCATION OF INTER TURBINE TEMPERATURE Aug-78 MODEL 690, 690A AND 690B S/N (ITT) COMPENSATOR THRU X ENGINE GROUND CABLE REPLACEMENT... 8-Nov-78 MODEL 500S AND 500U S/N 1531 THRU 1876; MODEL 500S S/N 3050 THRU 3317 REVISED DECEMBER 2002 PAGE 11 OF 17

12 322A X INSPECTION AND REPLACEMENT OF ENGINE Jul-79 MODEL 500A, 500B, 500S, 500U, EXHAUST CHUTE RIVETS 560F, 680F, 680F(P), 680FL, 680FL(P) S/N 871 THRU 1876; MODEL 500S S/N 3050 THRU A X PITOT-STATIC SYSTEM MODIFICATION Nov-80 MODEL 690A AND 690B S/N THRU X REPLACEMENT OF CENTER FUEL QUANTITY Jan-79 MODEL 690B S/N THRU TRANSMITTER GASKET 11490, THRU 11504, THRU 11509, THRU 11512, EQUIPPED WITH GULL AIRBORNE INSTRUMENTS, INC. FUEL QUANTITY TRANSMITTER P/N WITH UNIT S/N 101 THRU X X CENTER FUEL TRANSMITTER GROMMET Apr-79 MODEL 685 S/N ONLY; REPLACEMENT MODEL 690A AND 690B S/N 11244, THRU 11439, THRU 11505, THRU 11513, 11515, 11516, 11520, 11523, 11526, 11528, 11529, 11531, X LOWER WING SKIN MODIFICATION Jul-79 MODEL 690, 690A AND 690B S/N THRU X BLEED AIR PRESSURE REGULATOR LINE... 3-Jul-79 MODEL 690, 690A AND 690B REPLACEMENT S/N THRU X THERMAL RELIEF VALVE PRESSURE... 7-Dec-79 MODEL 690B S/N THRU ADJUSTMENT X MODS FOR FLIGHT INTO KNOWN ICING Feb-80 MODEL 690C S/N THRU CONDITION X WING FUEL CELL SUPPORT INSTALLATION Feb-80 MODEL 690C S/N THRU X INTER TURBINE TEMPERATURE (ITT) Mar-80 MODEL 690, 690A AND 690B S/N INDICATOR CHECKOUT AND/OR REPLACEMENT THRU X ENGINE FIRE DETECTOR RELOCATION May-80 MODEL 690C S/N THRU 11625; MODEL 695 S/N THRU X ENVIRONMENTAL CONTROL UNIT (ECU) May-80 MODEL 690C S/N THRU PRESSURE SWITCH RECALIBRATION OR 11630; MODEL 695 S/N REPLACEMENT THRU A X ELECTRIC START SYSTEM MOD AND Mar-81 MODEL 690C S/N THRU STARTER-GENERATOR GROUND BUS 11633; MODEL 695 S/N BAR REPLACEMENT THRU X CIRCUIT BREAKER PANEL ASSEMBLY MOD Aug-80 MODEL 690C S/N THRU 11639; MODEL 695 S/N THRU X X INTER TURBINE TEMPERATURE (ITT) Oct-80 MODEL 690B S/N 11431, INDICATOR REPLACEMENT THRU 11566; MODEL 690C S/N THRU X ENGINE MOUNT BRACKET MODIFICATION Nov-80 MODEL 690C S/N THRU 11650; MODEL 695 S/N THRU A X AFT FUSELAGE THERMOSTAT INSTALLATION Mar-81 PART I: MODEL 690C S/N THRU 11650; MODEL 695 S/N THRU PART II: MODEL 690C S/N THRU 11662; MODEL 695 S/N THRU X BAGGAGE HEATER ANNUNCIATOR LIGHT Jan-81 MODEL 690C S/N 11620, 11621, LENS REPLACEMENT 11623, THRU 11631, 11633, 11635, 11638, 11639, 11642, 11646, THRU 11653; MODEL 695 S/N 95000, THRU 95005, THRU 95012, THRU 95018, 95020, 95022, 95023, 95025, 95026, 95028, 95029, 95031, THRU 95036, 95038, THRU 95044, 95046, PAGE 12 OF 17 REVISED DECEMBER 2002

13 340 X INSTALLATION OF PLACARD FOR USE OF Apr-81 MODEL 690C S/N THRU ALTERNATE ENGINE OIL-MIL-L-7808G 11663; MODEL 695 S/N THRU X X BATTERY RELAY DIODE REMOVAL... 1-May-81 MODEL 680T, 680V, 680W, 681 AND 685; MODEL 690 AND 690A S/N THRU 11248, THRU X X INSPECTION OF ENGINE MOUNT CASTING Jun-81 MODEL 690, 690A AND 690B S/N BOLTS THRU 11566; MODEL 690C S/N THRU 11630; MODEL 695 S/N THRU 95007, THRU X HIGHER WATTAGE PITOT TUBES Oct-81 MODEL 690C S/N THRU AND 11709; MODEL 695 S/N THRU 95055, THRU X X X M.L.G. TORQUE LINK SHAFT REPLACEMENT Jul-81 MODEL 680FL(P), 680T, 680V, 680W S/N 1261 THRU 1854; MODEL 681 AND 685; MODEL 690, 690A AND 690B S/N THRU 11566; MODEL 690C S/N THRU 11676; MODEL 695 S/N THRU X X VERTICAL STABILIZER ATTACH BOLTS Jan-82 MODEL 690, 690A AND 690B S/N INSPECTION THRU 11566; MODEL 690C REV NO. 1 ( ) S/N THRU AND 11709; MODEL 695 S/N THRU X X X REPLACEMENT OF INNER STRUCTURAL... 1-Sep-81 MODEL 690C S/N 11664, CABIN WINDOW GLASS THRU 11670, 11672, AND REV NO. 1 (6/23/86) 11709; MODEL 695 S/N THRU 95063, THRU 95069, THRU AND 95075; THE FOLLOWING WHICH HAD WINDOW SPACERS REPLACED BETWEEN 1 JAN 1981 AND 15 JUN 1981: MODEL 680FL(P), 680T, 680V, 680W S/N 1261 THRU 1854; MODEL 681, 685, 690, 690A, 690B; MODEL 690C S/N THRU 11663; MODEL 695 S/N THRU X REPLACEMENT OF INNER STRUCTURAL... 3-Nov-81 MODEL 695A S/N AND CABIN WINDOW GLASS THRU A X X X ELEVATOR PUSH-PULL TUBE ASSEMBLY Feb-84 MODEL 680FL, 680FL(P), 680T, INSPECTION AND REPLACEMENT 680V AND 680W S/N 1261 THRU 1854; ALL MODEL 681, 685, 690, 690A, 690B; MODEL 690C S/N S/N THRU 11718; MODEL 695 S/N THRU 95084, MODEL 695A S/N 96001, 96003, THRU 96015, X COCKPIT INSULATION--OVERHEAD SWITCH Apr-82 MODEL 690C S/N THRU..PANEL 11721; MODEL 690D S/N THRU 15004; MODEL 695 S/N THRU 95084; MODEL 695A S/N THRU X X X PARKER HANNIFIN CORP. PRODUCT Jun-82 MODEL 560F, 680F, 680FL(P), REFERENCE MEMO (PRM) NO T, 680V AND 680W, S/N 871 THRU 1850; MODEL 681, 690, 690A AND 690B; MODEL 690C S/N THRU 11667, THRU 11709; MODEL 690D S/N THRU AND 15006; MODEL 695 S/N THRU 95049, THRU 95084; MODEL 695A S/N THRU AND REVISED DECEMBER 2002 PAGE 13 OF 17

14 352 X FUEL CELL INTERCONNECT HOSE Jul-82 MODEL 690C S/N THRU REPLACEMENT 11664, THRU 11687, THRU 11703, 11709, THRU 11721; MODEL 690D S/N THRU 15004, 15006, 15008, 15009, AND 15012; MODEL 695 S/N THRU 95049, THRU 95084; MODEL 695A S/N THRU 96035, 96037, 96039, X X X X FLIGHT CONTROL CHAIN CONNECTOR LINK... 3-Sep-82 ALL MODELS 500, 500A, 500B, INSPECTION 500S, 500U, 520, 560, 560A, 560E, 560F, 680, 680E, 680F, 680F(P), 680FL, 680FL(P), 680T, 680V, 680W, 681, 720, 685, 690, 690A, 690B; MODEL 690C S/N THRU 11727; MODEL 690D S/N THRU 15014; MODEL 695 S/N THRU 95084; MODEL 695A S/N THRU X MAIN LANDING GEAR WHEEL BEARING AND... 1-Oct-82 MODEL 690C S/N THRU AXLE HOUSING INSPECTION 11721, AND 11727; MODEL 690D S/N THRU 15004, 15006, 15008, 15009, 15013, AND 15016; MODEL 695 S/N THRU 95084; MODEL 695A S/N THRU 96035, 96037, THRU X X FUSELAGE STATION SCREW Nov-82 MODEL 690, 690A AND 690B S/N TORQUE INSPECTION THRU 11566; MODEL 690C S/N THRU 11721, AND 11727; MODEL 690D S/N THRU 15004, 15006, THRU AND 15014; MODEL 695 S/N THRU 95084; MODEL 695A S/N THRU 96037, THRU X PNEUMATIC TUBE ASSEMBLY INSPECTION Feb-83 MODEL 690C S/N THRU 11721, 11723, AND 11727; MODEL 690D S/N THRU 15004, 15006, THRU 15011, 15014, 15018, 15021, 15022; MODEL 695 S/N THRU 95084; MODEL 695A S/N THRU A X AILERON LEADING EDGE SKIN MODIFICATION... 4-Nov-83 MODEL 690C S/N THRU 11664, THRU 11721, 11723, 11726, 11727; MODEL 690D S/N THRU 15006, THRU 15011, 15014, 15016, 15018; MODEL 695 S/N THRU 95084; MODEL 695A S/N THRU 96037, 96039, 96040, 96042, THRU X OXYGEN MASK DISPENSER LID GASKET INSTL Apr-83 MODEL 690C S/N THRU 11727, MODEL 690D S/N THRU 15014, 15016, AND 15021; MODEL 695A S/N THRU X FUSELAGE STATION FRAME ASSY MOD Jun-83 MODEL 690C S/N THRU 11631, THRU 11729; MODEL 690D S/N THRU 15024; MODEL 695 S/N THRU 95084; MODEL 695A S/N THRU X FLAP BRACKET INSPECTION... 1-Aug-83 MODEL 690D S/N THRU 15018; MODEL 695A S/N THRU PAGE 14 OF 17 REVISED DECEMBER 2002

15 361 X HYDRAULIC HOSE REPLACEMENT... 4-Nov-83 MODEL 690D S/N THRU 15029; MODEL 695A S/N 96056, THRU 96061, 96063, X INSPECTION AND/OR MOD OF OBSERVER... 2-May-84 MODEL 690D S/N THRU SEAT SHOULDER HARNESS STRUCTURE 15029; MODEL 695A S/N THRU 96061, 96063, 96064, 96069, 96072, X FUEL DRAIN SYSTEM INSPECTION... 1-Nov-83 MODEL 690C S/N THRU 11730; MODEL 690D S/N THRU 15029; MODEL 695 S/N THRU 95084; MODEL 695A S/N 96001, THRU 96065, 96069, 96072, 96075, X SERIES MODE ANNUNCIATOR LIGHT TAPE Nov-83 MODEL 690C S/N AND REPLACEMENT 11732; MODEL 690D S/N THRU 15029; MODEL 695A S/N THRU 96061, THRU 96065, 96069, 96072, 96075, X FUEL BOOST PUMP REPLACEMENT... 3-Feb-84 MODEL 690C S/N THRU 11732; MODEL 690D S/N THRU 15032; MODEL 695A S/N THRU 96061, THRU 96069, 96072, 96075, 96078, A X X X NOSE LANDING DRAG LINK STRUCTURE MOD Mar-85 MODEL 500S S/N 3050 THRU 3323; MODEL 680W S/N 1721 THRU 1850; MODEL 681 S/N 6001 THRU 6072; MODEL 685 S/N THRU 12066; MODEL 690 S/N THRU 11079; MODEL 690A S/N THRU 11344; MODEL 690B S/N THRU 11566; MODEL 690C S/N THRU 11735; MODEL 695 S/N THRU X X PARKER HANNIFIN CORP. PRODUCT... 4-Jan-85 FACTORY APPROVED: MODEL REFERENCE MEMO (PRM) NO A S/N THRU 11344; (REV A: AND B BRAKE ASSYS) MODEL 690B S/N THRU 11566; MODEL 690C S/N THRU 11734; MODEL 690D S/N THRU 15033, THRU 15037; MODEL 695 S/N THRU 95084; MODEL 695A S/N THRU 96061, THRU 96072, 96075, 96077, 96078, 96082, 96085, 96088, 96089; MODEL 695B S/N AND STC APPROVED: MODEL 690 S/N THRU 11079; MODEL 690A S/N THRU X HEAVY DUTY NOSE LANDING GEAR... 4-Jan-85 MODEL 690C S/N AND THRU 11734; MODEL 690D S/N THRU 15033, 15035, 15036, 15037; MODEL 695A S/N THRU 96061, THRU 96072, 96075, 96077, 96078, 96085, 96088; MODEL 695B S/N AND X X X LANDING GEAR CONTROL ASSY LUBRICATION Jan-85 MODEL 685 S/N THRU 12066; MODEL 690, 690A AND 690B S/N THRU 11566; MODEL 690C S/N THRU 11729; MODEL 690D S/N THRU 15024; MODEL 695 S/N THRU 95084; MODEL 695A S/N THRU REVISED DECEMBER 2002 PAGE 15 OF 17

16 370 X FREON AIR CONDITIONER COMPRESSOR... 4-Oct-85 FOLLOWING IF FREON AIR BELT COVER ASSY INSTL CONDITIONING INSTL WAS PROCURED FROM THE FACTORY: MODEL 690C S/N AND 11735; MODEL 690D S/N 15005, 15010, 15017, 15019, 15023, 15025, 15031; MODEL 695A S/N 96027, 96038, 96041, 96046, 96048, 96054, 96056, 96057, 96059, 96061, 96065, 96068, 96077, 96081, 96088, 96089, 96091, 96093, 96094, 96095; MODEL 695B S/N AND X EXPAND TEMPERATURE RANGE OF ENVIRO Apr-89 MODEL 690C S/N THRU SYSTEM IN AUTO MODE 11735; MODEL 690D S/N THRU 15042; MODEL 695 S/N THRU 95084; MODEL 695A S/N THRU 96100; MODEL 695B S/N THRU X ENVIRO SYSTEM AMBIENT VALVE Oct-89 MODEL 690C S/N 11602, 11603, 11614, 11618, 11620, 11624, 11636, 11638, 11640, 11652, 11656, 11663, 11664, 11669, 11673, 11676, 11679, 11681, 11682, 11683, 11685, 11687, 11693, 11701, 11703, 11709, 11721; MODEL 690D S/N 15004, 15005, 15007, 15011, 15014, 15015, 15016, 15020, 15021, 15025, 15026, 15028, 15032, 15039, 15042; MODEL 695 S/N 95003, 95006, 95008, 95022, 95024, 95034, 95044, 95048, 95058, 95060, 95061, 95062, 95065, 95070,95079, 95084; MODEL 695A S/N 96012, 96023, 96025, 96032, 96033, 96055, 96058, 96066; MODEL 695B S/N AND X X X INSPECTION OF MAIN LANDING GEAR CLEVIS Apr-2000 MODELS 500A, 500B, 500S, 500U, AND DRAG BRACE INSTALLATIONS 560F, 680F, 680FL, 680FL(P), 680F(P), 685, 680T, 680V, 680W, 681, 690, 690A, 690B, 690C, 690D, 695, 695A, 695B 378 X X REPLACEMENT OF MAGNESIUM UNDER-FLOOR Nov-2001 MODELS 680FL(P), 680T, 680V, DUCTS 680W, 681, 690, AND 690A (THRU S/N 11268) 379 X X INSPECTION OF MAGNESIUM FUEL SYSTEM Oct-2000 MODELS 500, 500A, 500B, 500S, PARTS 500U, 560A, 560E, 560F, 680, 680E, 680F, 680FL, 680FL(P), 680FP, 685, AND X X X X SEALING CABIN LEAKS IN AIRCRAFT... 5-Sep , 680F(P), 680FL(P), 680T, PRESSURIZED TO THE FLOOR Rev 1:18 Jul V, 680W, 681, 685, 690, 690A, 690B, 690C, X SEALING CABIN LEAKS IN AIRCRAFT... 5-Sep D, 695A, 695B. PRESSURIZED TO THE SKIN Rev 1:18 Jul X X X INSTRUCTIONS FOR THE INSPECTION OF... 2-Feb , 685, 690, 690A 690B, 690C, 695 ENGINE CONTROL CABLE SEAL NUTS, 695A, 695B 385 X BETA PRESSURE SWITCH SYSTEM MODIFICATION 25 April , 690A, 690B 386 X X X X MAIN LANDING GEAR SCISSOR MODIFICATION 2 Dec A SN: , 500B SN: 875- REPLACING MAIN LANDING GEAR INNER BODY 1645, 500U SN: , 500S SN: , 560F SN: F SN: , 680FL SN: , 680FLP SN: , 680T SN: , 680V SN: Continued next page.. PAGE 16 OF 17 REVISED February 2012

17 386 CONTINUED: 386 X X X X MAIN LANDING GEAR SCISSOR MODIFICATION 2 Dec W SN: , 681 SN: REPLACING MAIN LANDING GEAR INNER BODY 6072, 685 SN: , 690 SN: , 690A SN: , 690B SN: , 690C SN: , 690D SN: , 695 SN: , 695A SN: X X NACELLE BULKHEAD REWORK 6 Jul T, 680V, 680W, 681, 690, 690A, (Replaces SB 242) 690B, 690C, 690D, 695, 695A, 695B 388 X X X SEALING CABIN SKINS TO THE 14 Mar F(P), 680FL(P), 680T, 680V, AIRCRAFT STRUCTURE 680W, 681, 685, 690, 690A, 690B, 690C, 690D, 695, 695A, 695B REVISED March 2016 PAGE 17 OF 17