(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.
32-09-02
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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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