(2)  
AMM 24-22-00/201, Electrical Power - Control

 C.
Access

 (1)  
Location Zones
 119/120 Main Equipment Center

 (2)  
Access Panels
 119BL Main Equipment Center

 D.
Prepare to Install the Air/Ground Relays

 S 862-028
 (1)  
Remove the electrical power if it has not been removed from the airplane (AMM 24-22-00/201).

 E.
Install the Air/Ground Relays

 S 712-030
 (1)  Do the test for the air/ground relay to make sure it operates correctly.
 NOTE: The test is in the task that follows.
____
 S 422-029
 (2) Use the screws to install the air/ground relays to the panel.
 TASK 32-09-02-712-031
 8. Do the Test for the Air/Ground Relays
_____________________________________
 A. General
 (1)  
This procedure gives a test to make sure each air/ground relay operates correctly.

 (2)  
This test does a check of the continuity and the voltage of the relay terminals. This is done for the airplane in the ground mode and the air mode. To make the test easier, a breakout box is used. Table 1 shows the energized or de-energized condition of each air/ground relay.

 (3)  
Do one more test for the K142 and the K202 relays to make sure they interface with the autoflight system.

 B.
Equipment

 (1)  
Relay Breakout Box - A32074-1

 C.
References

 (1)  
AMM 22-41-00/501, Maintenance Monitor

 (2)  
AMM 24-22-00/201, Electrical Power - Control

 D.
Access

 (1)  
Location Zones
 119/120 Main Equipment Center

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A

757 MAINTENANCE MANUAL
 (2)  
Access Panels
 119BL Main Equipment Center

 E.
Prepare to Do the Test for the Air/Ground Relays

 S 862-069
 (1)  
Look at P11 panel at grid location 11C19, and identify the circuit breaker name that is at this location.

 (a)  
Airplanes with "Landing Gear Pos Sys 2 Altn" circuit breaker installed at panel grid location 11C19, make sure this circuit breaker is closed: 1) 11C19, LANDING GEAR POS SYS 2 ALTN

 S 862-032
 (2)  
Make sure these circuit breakers on the overhead circuit breaker panel, P11, are closed:

 (a)  
11C30, LANDING GEAR POS SYS 1

 (b)  
11S15, LANDING GEAR AIR/GND SYS1

 (c)  
11S19, LANDING GEAR AIR/GND SYS2

 (d)  
11S23, POS SYS 2

 S 862-039
 (3)  
GUN 006-999; make sure this circuit breaker on the main power distribution panel, P6, is closed:

 (a)  
6C3, HYD GEN CONT

 F.
Do the Test for the Ground Mode

 S 862-043
 (1)  
Supply electrical power (AMM 24-22-00/201).

 (2)  
Do a continuity check for the air/ground relay.

 S 762-044
 NOTE: Refer to Table 201 for the condition of the relay
____ (energized or de-energized). When you do the continuity check, make sure the electrical power is removed from the system connected to the relay.
 

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A 757 MAINTENANCE MANUAL
TABLE 201 AIR/GROUND RELAY
RELAY NO.  PANEL  RELAY STATUS 1 CONNECTOR NUMBER  AIRGROUND CONTINUITY BETWEEN THESE PINS: 
　
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