(a)  While the APU is motored, make sure the fan in the APU start TRU operates.
 S 864-012
 (4)  
Do the shutdown procedure for the APU (Ref 49-11-00).

 S 414-013

 (5)
Close the access panels aft of the aft equipment center rack, E6.

 (6)
Remove electrical power if it is not necessary (Ref 24-22-00)

 S 864-014
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757 MAINTENANCE MANUAL
 APU START TRU FAN CONTROL RELAY - REMOVAL/INSTALLATION
______________________________________________________
 1.  General_______
 A. The APU start TRU fan control relay, K619 (referred to as the control relay) is on the relay panel in the aft equipment center rack, E6.
 TASK 24-32-06-004-001
 2.  Remove the APU Start TRU Fan Control Relay (Fig. 401)__________________________________________
 A. Access
 (1)  
Location Zones
 154 Aft Cargo Compartment (Right)

 (2)  
Access Panel
 822 Aft Cargo Compartment Door

 B. Prepare for the Removal
 S 864-002
 (1)  Open this circuit breaker on the main power distribution panel, P6, and attach a DO-NOT-CLOSE tag:
 (a)  6H12, APU START TRU CONTROL
 S 864-003
 (2)  Open this circuit breaker on the aft equipment center rack, E6, and attach a DO-NOT-CLOSE tag:
 (a)  APU TRU FAN
 S 024-004
 (3)  Do these steps to remove the control relay:
 (a)  
Open the access cover on the rear of the aft equipment center rack, E6.

 (b)  
Remove the control relay.

 TASK 24-32-06-404-005
 3.  Install the APU Start TRU Fan Control Relay (Fig. 401)___________________________________________
 A. References
 (1)  AMM 24-22-00/201, Electrical Power - Control
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757
MAINTENANCE MANUAL

AFT CARGO DOOR
AFT EQUIPMENT E6 RELAY PANEL
CENTER RACK, E6
SEE B
SEE A
AFT CARGO DOOR, 822
APU START TRU (REF) 1 FWD
AFT EQUIPMENT CENTER RACK, E6
A
APU START TRU FAN CONTROL RELAY, K619 (AT ONE OF THESE LOCATIONS)
1
E6 RELAY PANEL B
1 AIRPLANES WITH APU START TRU
APU Start TRU Fan Control Relay Installation Figure 401
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757
MAINTENANCE MANUAL

 (2)  AMM 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 Start TRU Fan Control Relay
 S 424-008
 (1)  Do these steps to install the control relay:
 (a)  
Install the control relay.

 (b)  
Close the access cover on the rear of the aft equipment center rack, E6.

 S 864-010
 (2)  Remove the DO-NOT-CLOSE tag and close this circuit breaker on the aft equipment center rack, E6:
 (a)  APU TRU FAN
 S 864-009
 (3)  Remove the DO-NOT-CLOSE tag and close this circuit breaker on the main power distribution panel, P6
 (a)  6H12, APU START TRU CONT
 D. Do a Test of the APU Start TRU Fan Control Relay Installation
　
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