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 A.  The following describes procedures for removing and installing the APU transformer rectifier unit (TRU) H123. In addition to the removal and installation instructions for the APU TRU, the procedure includes an operational test to verify operation of the device following installation.
 B.  The APU TRU is mounted in the E-33 equipment rack with the APU battery. The E-33 equipment rack is located in the aft passenger cabin on the left side.
 C.  Access to the E-33 equipment rack is gained by opening the E-33 access door.
 TASK 24-32-04-004-021
 2.  Remove APU Transformer Rectifier Unit (Fig. 401)_____________________________________
 A.  References
 (1)  
AIPC 24-31-06, Fig. 1

 (2)  
WDM 24-32-31

 (3)  
SSM 24-32-03

 B.  
Access

 (1)  
Location Zone
 271 Passenger Cabin, LH

 C.  
Procedure

 S 864-002
 (1)  
Verify APU switch, located on the P5 overhead panel, is set to the OFF position and attach DO-NOT-OPERATE identifier.

 S 864-003

 (2)  
Open circuit breakers as follows for APU TRU, and attach DO-NOT-CLOSE identifiers:

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

 

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MAINTENANCE MANUAL

E-8 RACK (REF)
SEE A SEE B
E-33 EQUIPMENT RACK
A
SCREW
(4 PLACES)

WASHER
(4 PLACES)

NUT (4 PLACES)
APU TRANSFORMER RECTIFIER (H123)
ELECTRICAL
CONNECTOR
(DH123)

NOTE: DC TERMINAL LEADS NOT
B  ____ SHOWN FOR CLARITY.
APU Transformer Rectifier Installation Figure 401
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747-400 MAINTENANCE MANUAL
 (b)  P183, E-33 Equipment Center Panel
 1) APU TRU FAN CONT
 2) APU TRU FAN SUPPLY
 3) APU TRU START

 S 034-005
 (3)  
Disconnect electrical connector (DH123) from receptacle on APU TRU.

 S 034-006

 (4)  
Remove three nuts from the APU TRU fan shroud to gain access to the APU TRU power terminals. Remove fan shroud.

 S 034-022

 (5)  
Remove two terminal nuts and two washers that secure each of the two APU TRU power leads to the APU TRU; disconnect leads.

 NOTE: Identify each of the terminal leads that connect to the
____ terminals of the APU TRU for reinstallation.
 S 434-028
 (6)
Reinstall terminal nuts and washers. Tighten finger-tight.

 S 434-026

 (7)  
Reinstall APU TRU fan shroud and secure with the three nuts. Tighten nuts.

 S 034-007

 (8)  
Remove four bolts and washers securing APU TRU to the E-33 equipment rack.

 S 024-021

 (9)  
Remove APU TRU from E-33 equipment rack.

 TASK 24-32-04-404-022
 3. Install APU Transformer Rectifier Unit (Fig. 401)
______________________________________
 A. Special Tools and Equipment
 (1)  
T477W Bonding Meter

 B.
References

 (1)  
AMM 25-59-05/601, Sidewall and Ceiling Insulation

 (2)  
AMM 49-11-00/201, Auxiliary Power Unit

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