(2)  
Access Panel
 822 Aft Cargo Compartment Door

 B.  Prepare for the Removal
 S 864-002
 (1)  Open this circuit breaker on the right generator power panel, P32, and attach a DO-NOT-CLOSE tag:
 (a)  32A6, APU START TRU PWR
 S 864-003
 (2)  Open this circuit breaker on the aft equipment center rack, E6, and attach a DO-NOT-CLOSE tag:
 (a)  APU START
 C.  Remove the APU TRU Start Relay
 S 024-004
 (1)  Do these steps to remove the start relay:
 (a)  
Open the access cover at the rear side of the aft equipment center rack.

 (b)  
Identify the wires on the start relay for the installation.

 (c)  
Remove the wires from the start relay.

 (d)  
Remove the screws that hold the start relay.

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DOOR CARGO AFT  CENTER RACK, E6 AFT EQUIPMENT SEE A 
AFT CARGO DOOR, 822  E6 RELAY PANEL BSEE 
FWD  TRU (REF) APU START 1 
AFT EQUIPMENT CENTER RACK, E6 A 

APU START TRU RELAY, K10010 E6 RELAY PANEL  1 
1  APU START TRU AIRPLANES WITH  B 
APU Start TRU Relay Installation Figure 401 

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 (e)  Remove the start relay.
 TASK 24-32-05-404-005
 3.  Install the APU TRU Start Relay (Fig. 401)_______________________________
 A. References
 (1)  
24-22-00/201, Electrical Power - Control

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

 B. Access
 (1)  
Location Zones
 154 Aft Cargo Compartment (Right)
 211/212 Flight Compartment

 (2)  
Access Panel
 822 Aft Cargo Compartment Door

 C. Install the APU TRU Start Relay
 S 424-006
 (1)  Do these steps to install the start relay:
 (a)  
Put the start relay in position so that the X1 and X2 terminals are to the outboard side.

 (b)  
Install the four screws that hold the start relay.

 CAUTION:_______MAKE SURE YOU INSTALL THE WIRES CORRECTLY. THE APU TRU SYSTEM WILL NOT OPERATE PROPERLY AND DAMAGE TO EQUIPMENT CAN OCCUR IF YOU DO NOT INSTALL THE WIRES CORRECTLY.

 (c)  
Connect the wires to the start relay.

 (d)  
Close the access cover on the aft side of the aft equipment center rack, E6.

 S 864-007
 (2)  Remove the DO-NOT-CLOSE tag and close this circuit breaker on the right generator power panel, P32:
 (a)  32A6, APU START TRU PWR
 S 864-008
 (3)  Remove the DO-NOT-CLOSE tag and close this circuit breaker on the aft equipment center rack, E6:
 (a)  APU START
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 D. Do a Test of the APU TRU Start Relay Installation
 S 864-009
 (1)  
Supply electrical power (Ref 24-22-00).

 S 014-010

 (2)  
Open the sidewall panels aft of the aft equipment center rack, E6, to get access to the APU start TRU.

 S 714-011

 (3)  
Motor the APU (Ref 49-11-00).
　
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