(a)  
P180, DC Power Distribution Panel
 1) 180C7, APU-TRU CONT

 (b)  
P183, E-33 Equipment Center Panel
 1) APU TRU FAN CONT
 2) APU TRU FAN SUPPLY
 3) APU TRU START

 S 864-016
 (10) Remove DO-NOT-OPERATE identifier from APU switch.
 E. Test APU Transformer Rectifier Unit
 S 864-017
 (1)  Verify APU START SOURCE switch, located on the P461 pilot's overhead maintenance panel, is set to TR mode.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 (2)  S 714-018Start APU (AMM 49-11-00/201)
 (3)  S 864-018Verify APU starts within 90 seconds.
 (4)  S 864-019Shut down APU if no longer needed (AMM 49-11-00/201).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 MAIN DECK CARGO HANDLING TRANSFORMER RECTIFIER UNIT - REMOVAL/INSTALLATION
__________________________________________________________________________
 1.  General
_______
 A.  The following describes procedures for removing and installing the main deck cargo handling transformer rectifier unit (TRU) T177.
 B.  The main deck cargo handling TRU is located in the area between the nose gear wheel well and fuselage on the right hand side. There is one TRU mounted to the forward side of the bulkhead (station 400) just forward of the main equipment center.
 C.  Access to the main deck cargo handling TRU is gained through a small access way from the electrical and electronics compartment.
 TASK 24-32-06-004-018
 2.  Remove Main Deck Cargo Handling Transformer Rectifier Unit (Fig. 401)
__________________________________________________________
 A.  References
 (1)  
AIPC 24-41-06, Fig. 2

 (2)  
WDM 24-54-91

 (3)  
SSM 24-54-08

 B.  
Access

 (1)  
Location Zone 116 Area Between Nose Gear Well and Fuselage, RH

 C.  
Procedure

 S 864-002
 (1)  
Open circuit breaker as follows for TRU and attach DO-NOT-CLOSE identifier:

 (a)  
P415, Power Distribution Center - Right 1) 415G16, MAIN DECK CARGO HDLG TRU

 (2)  
Remove nuts securing terminal block cover to terminal block on TRU.

 S 034-004

 (3)  
Remove five terminal block screws that secure each of the five terminal leads to TRU and disconnect leads.

 S 034-003
 NOTE: Identify each of the five terminal leads that connect to
____
 the TRU for reinstallation.

 S 434-005
 (4)  Reinstall terminal block screws and tighten finger-tight.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A

747-400 MAINTENANCE MANUAL
SEE A
SEE B
A
MAIN DECK CARGO TRANSFORMER TERMINAL LEADRECTIFIER (5 LOCATIONS)UNIT, T177
TERMINAL
BULKHEAD BLOCK COVER
BOLT NUT (4 LOCATIONS) (2 LOCATIONS)
FWD
B
Main Deck Cargo Handling Transformer Rectifier Unit (TRU) Installation Figure 401
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