(2)  
Do the task to put the safety-sensitive systems back to their initial conditions.

 S 862-050

 (3)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 S 862-049
 

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757 MAINTENANCE MANUAL
 AIR/GROUND RELAY SYSTEM - ADJUSTMENT/TEST
_________________________________________
 1.  General________
 A.  This procedure contains the steps necessary to make sure the air/ground relays operate correctly and the EICAS messages are shown.
 TASK 32-09-02-735-001
 2.  The System Test for the Air/Ground Relay System_______________________________________________
 A.  General
 (1)  
It is not necessary to retract the landing gear to do this test. You will use actuators and deactuators on the proximity sensors to simulate the air mode and the ground mode.

 (2)  
There are two parallel logic systems for the air/ground relay system.

 (3)  
When you put the actuators and deactuators on the air/ground relay sensors, the indications change.

 (4)  
When you put the actuator adjacent to the proximity sensor, the sensor is operated. For the rectangular sensors the maximum distance between the sensor and the actuator is 0.15 inches. This distance is 0.05 inches for round sensors. The actuator can touch the sensing surface of the sensor.

 (5)  
To stop the operation of the proximity sensor, put the deactuator between the sensor face and the target. The deactuator can touch the sensor or the target or the sensor and the target.

 B.  
Equipment

 (1)  
Proximity Sensor Actuator/Deactuator Set -A27092-84 (2 Rectangular sensor deactuators and
 2 rectangular system actuators are necessary)

 (2)  
Voltmeter or Ohmmeter - commercially available

 C.  
References

 (1)  
24-22-00/201, Electrical Power - Control

 (2)  
27-61-00/201, Spoiler/Speedbrake Control System

 (3)  
29-11-00/201, Pressurize/Depressurize Main Left Hydraulic System

 (4)  
32-00-20/201, Landing Gear Downlocks

 (5)  
32-09-02/201, Air/Ground Relays

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757
MAINTENANCE MANUAL

 D. Access
 (1)  
Location Zones
 119/120 Main Equipment Center
 211/212 Control Cabin
 711 Nose Landing Gear
 731/741 Main Landing Gear

 (2)  
Access Panels
 199BL Main Equipment Center

 E.
Prepare to Do the Test

 S 865-002
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 495-003

 (2)  
Make sure the downlocks are installed on the nose and main landing gear (Ref 32-00-20/201).

 S 495-004

 (3)  
Make sure the chocks are below the wheels.

 S 045-005
 WARNING: PREPARE THE SAFETY-SENSITIVE SYSTEMS FOR THE AIR MODE BEFORE
_______ INSTALL THE ACTUATORS OR DEACTUATORS ON THE SENSORS. IN THE AIR MODE, MANY OF THE AIRPLANE SYSTEMS CAN OPERATE AND CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (4)  
Prepare the safety-sensitive systems for air mode simulation (Ref 32-09-02/201).

 S 865-006

 (5)  
Make sure these circuit breakers on the overhead circuit breaker panel, P11, are closed:
　
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本文鏈接地址：757 AMM 飛機維護手冊 起落架 CHAPTER 32 - LANDING GEAR 1(38)