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 (6)  S 714-014Do a test of the DC tie control unit, as follows: (a) Push the ELEC HYD switch on the EICAS MAINT panel on the right side panel, P61. (b) Open this circuit breaker: 1) 6C23 or 32EE2, R TRU
 (7)  S 864-018Approximately 12 seconds after you open the circuit breaker, make sure these values show below R on the bottom EICAS display:
 DC-V  28 |4
 DC-V  28 |4
 DC-A  0

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 (a)  
Close this circuit breaker:
 1) 6C23 or 32EE2, R TRU

 (b)  
Open this circuit breaker on the P6 panel:
 1) 6A6, DC BUS TIE CONT

 (c)  
After five seconds, close this circuit breaker on the P6 panel: 1) 6A6, DC BUS TIE CONT

 (d)  
Push the ECS MSG switch on the EICAS MAINT panel on the right side panel, P61.

 (e)  
Make sure the EICAS message, TR UNIT, does not show on the bottom display.

 S 864-015
 (8)  
Do the activation procedure for the spoilers if you did the deactivation procedure (AMM 27-61-00/201).

 S 864-016

 (9)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

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 APU START TRU - REMOVAL/INSTALLATION
____________________________________
 1.  General_______
 A.  The APU start TRU is aft of the aft equipment center rack, E6. You must remove the sidewall panels behind the aft equipment center rack to get access to the APU start TRU.
 TASK 24-32-04-024-001
 2.  Remove the APU Start TRU (Fig. 401)________________________
 A.  Access
 (1)  
Location Zone
 154 Aft cargo compartment (Right)

 (2)  
Access Panel
 822 Aft cargo door

 

 B.  Prepare for Removal
 S 864-002
 (1)  Open this circuit breaker on the right generator power panel (referred to as the P32 panel) and attach a DO-NOT-CLOSE tag:
 (a)  32A6, APU START TRU POWER
 S 014-004
 (2)  Open the sidewall panels behind the aft equipment center rack, E6.
 C.  Remove the APU Start TRU
 S 024-006
 (1)  Do these steps to remove the APU start TRU:
 (a)  
Remove the electrical connector from the APU start TRU.

 (b)  
Identify the two leads on the APU start TRU for installation.

 (c)  
Remove the two leads from the APU start TRU.

 (d)  
Remove the bolts that hold the APU start TRU.

 (e)  
Remove the APU start TRU.

 TASK 24-32-04-424-007
 3.  Install the APU Start TRU (Fig. 401)_________________________
 A.  Equipment
 (1)  Bonding meter - Model T-477W
 Avtron Manufacturing, Inc.,
 Cleveland, Ohio

 B.  References
 (1)  
SWPM 20-20-00, Standard Wiring Practice Manual D6-54446.

 (2)  
AMM 24-22-00/201, Electrical Power - Control

 (3)  
AMM 49-11-00/201, Auxiliary Power Unit

 C.  Access
 (1)  Location Zones
 154 Aft cargo compartment (right)
 211/212 Flight compartment

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MAINTENANCE MANUAL
　
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