93-50 INFRARED SENSORS

Transcription

1 INFRARED SENSORS 1. DESCRIPTION That portion of the system that uses heat sensing devices such as infra-red scanners, infra-red image and detection to acquire information. This includes the Enhanced Vision System. The Enhanced Vision System (EVS) is an electro-optical system that uses a Long-Wave Infrared (IR) camera to enhance situational awareness. Infrared red is particularly effective at night, smoke, haze, and smog in addition to a broad spectrum of rain, snow, and radiation-type fog. EVS is an aid to visual acquisitions of: Ground vehicles and other ground-based equipment/obstacles, Aircraft on taxi-ways and runways, Other traffic during takeoff, approach, and landing, Runway and taxi lights, Runway and terrain features during climb, descent, and low altitude maneuvering. The EVS sensor, located on the underside of the LH wing, contains a long-wave infrared camera that produces a infrared image and a low-light CMOS camera that produces a visible image. The two images are then combined to produce a single monochrome image that is transmitted directly to the MFD. Upon power-up the sensor requires approximately 90 seconds to produce a usable image. 28 VDC for Enhanced Vision System operation is supplied through the 5-amp EVS CAMERA circuit breaker on Main Bus 3. Refer to the manufacturer s approved Instructions For Continued Airworthiness. All Page 1 15 Jun 2010

2 2. TROUBLESHOOTING Trouble - PFD Probable Cause Remedy Video image not displayed. Software not configured. Perform Adjustment/Test - Perspective Integrated Avionics System Software Setup, selecting the EVS option. (Refer to 42-20) No power to EVS unit. Display not receiving image information. Following initial power-up, listen for series of clicks as camera shutters open and close. If camera doesn t power on, verify security of connectors and wire harness. Verify security of connectors and wire harness. Halo Images. As sensor windows are heated, infrared detector not able to compensate for signal from window, as compared to outside view, so a white (hot) area may appear around image perimeter. Turn system on during preflight or run-up to stabilize window and body heaters prior to flight and allow thermal stabilization. Image degraded, or possibly even displayed as solid black or solid white. Display is visible but has an X and some bars through the image. Improper display settings. Anti-Tamper device not connected properly. Faulty wiring. Following initial power-up, adjust brightness and contrast settings to obtain the best image. Verify anti-tamper device is connected to the proper pin. Check wiring connecting anti-tamper device. Page 2 All

3 3. MAINTENANCE PRACTICES A. Enhanced Vision System (EVS) Camera - Serials w/ Perspective Avionics (See Figure 1) (1) Removal - EVS Camera (a) Set BAT 1, BAT 2, and AVIONICS switches to OFF positions. (b) Pull EVS CAMERA circuit breaker. (c) Remove wing access panel LW5. (Refer to 06-00) (d) Disconnect wire harness connector from camera. (e) Remove bolts and washers securing camera, gasket, and spacer to wing. (f) Remove screw securing spacer and gasket to camera. (g) Remove camera, gasket, and spacer from airplane. (h) Remove remaining sealant from wing. (2) Installation - EVS Camera (a) Acquire necessary tools, equipment, and supplies. Description P/N or Spec. Supplier Purpose Loctite 222 or 222MS Any Source Secure EVS camera. Caulk Sealant (Refer to 51-30) (Refer to 51-30) Weather sealant. (b) Connect wire harness connector to camera. (c) Apply Loctite to bolt threads. (Refer to 20-40) (d) Position spacer and gasket on camera and secure with screw through forward inboard hole. (e) Position spacer, gasket, and camera to wing and secure with bolts and washers. (f) Use sealant to fillet seal spacer base. (Refer to 20-10) (g) Install wing access panel LW5. (Refer to 06-00) (h) Reset EVS CAMERA circuit breaker. (i) Perform Operational Test - EVS Camera. (Refer to ) (3) Operational Test - EVS Camera (a) Pull STARTER RELAY and FUEL PUMP RELAY circuit breakers. (b) Set BAT 1 switch to ON position. (c) Allow PFD and MFD to initialize for approximately one minute. (d) On MFD, select Aux-Video page. (e) Verify EVS video is displayed on top section of MFD. (f) Verify no part of aircraft, excluding propeller, is visible in displayed video field-of-view. (g) Set BAT 1 switch to OFF position. (h) Reset STARTER RELAY and FUEL PUMP RELAY circuit breakers. Serials w/ Perspective Avionics Page 3 15 Jun 2010

4 B LEFT WING (REF) LEGEND 1. EVS Camera 2. Gasket 3. Spacer 4. Bolt 5. Washer 6. Screw Serials thru , 22T-0001 thru 22T SR22_MM93_2862 Figure 1 EVS Camera Installation - Serials thru w/ Perspective Avionics, 22T-0001 thru 22T-1003 (1 of 2) Page 4 Serials thru w/ Perspective Avionics, 22T-0001 thru 22T-1003

5 4 5 LEFT WING (REF) LEGEND 1. EVS Camera 2. Gasket 3. Spacer 4. Bolt 5. Washer DETAIL B Serials & subs, 22T-1004 & subs. SR22_MM93_4682 Figure 1 EVS Camera Installation - Serials & subs, 22T-1004 & subs (Sheet 2 of 2) Serials & subs, 22T-1004 & subs Page 5

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