(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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A
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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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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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