AIRPLANES WITH APU START TRU
APU Start TRU Installation Figure 401
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(2) Access Panel
822 Aft cargo door
D. Install the APU start TRU
S 424-008
(1) Do these steps to install the APU start TRU:
(a)
Put the APU start TRU in position.
(b)
Install the bolts that hold the APU start TRU.
(c)
Connect the two leads to the APU start TRU.
(d)
Connect the electrical connector to the TRU.
S 864-009
(2) Remove the DO-NOT-CLOSE tag and close this circuit breaker on the P32 panel:
(a) 32A6, APU START TRU POWER
E. Do these steps to check the APU start TRU ground stud:
S 214-020
(1) If the terminal lug, ground strap or stud is damaged, deformed, discolored or annealed, do these steps:
(a) Repair or replace the terminal lug, ground strap or stud (SWPM 20-30-00).
NOTE: If the terminal lug is annealed, replace the lug with a
____ high temperature terminal lug (SWPM 20-30-11).
CAUTION: DO NOT PULL ON THE GROUND WIRE AFTER THE GROUND STUD IS
_______ TIGHTENED. DAMAGE TO EQUIPMENT OR AIRPLANE STRUCTURE MAY OCCUR.
(b)
Make sure each APU TRU ground stud nut is torqued from 180 to 200 pound-inch (SWPM 20-30-00).
(c)
Make sure the electrical bonding on the APU TRU ground studs are 0.0001 ohms (SWPM 20-20-00).
S 284-022
(2) If the terminal lug, ground strap or stud is not damaged, deformed, discolored or annealed but the electrical bonding of the ground stud is in question, do these steps:
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CAUTION: DO NOT PULL ON THE GROUND WIRE AFTER THE GROUND STUD IS
_______ TIGHTENED. DAMAGE TO EQUIPMENT OR AIRPLANE STRUCTURE MAY OCCUR.
(a)
Make sure each APU ground stud nut is torqued from 180 to 200 pound-inch (SWPM 20-30-00).
(b)
Make sure the electrical bonding of the APU ground studs are 0.0001 ohms (SWPM 20-20-00).
S 164-021
(3) Clean the fuselage area next to the APU TRU ground studs. Make sure there is no dust on the APU TRU ground stud area.
F. Do a test of the APU start TRU installation.
S 864-011
(1)
Supply electrical power (AMM 24-22-00/201).
S 714-012
(2)
Motor the auxiliary power unit (AMM 49-11-00/201) and make sure the fan inside of the APU start TRU comes on.
G. Put the Airplane Back to Its Usual Condition
S 864-013
(1)
Shutdown the auxiliary power unit.
S 414-014
(2)
Close the sidewall panels behind the aft equipment center rack, E6.
(3)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 864-016
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APU TRU START RELAY - REMOVAL/INSTALLATION
__________________________________________
1. General_______
A. The APU TRU start relay, K10010 (referred to as the start relay) is on the relay panel in the aft equipment center rack, E6.
TASK 24-32-05-004-001
2. Remove the APU TRU Start Relay (Fig. 401)______________________________
A. Access
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