CAUTION: YOU MUST BE CAREFUL WHEN YOU INSTALL THE PUMP IN THE RECEIVER.
_______ YOU CAN CAUSE DAMAGE TO THE PACKING AND CAUSE FUEL LEAKS.
(6)
Install the boost pump (7) in the receiver.
S 434-016
(7)
Install the bonding jumper (3) on the inboard mounting bolt (5).
S 434-017
(8)
Install the bolts (5 and 9) and the washers (6) to attach the pump (7) to the receiver.
S 434-034
(9)
Install lockwire on the bolts.
S 944-020
(10)
Measure the resistance between the pump (7) and the spar web (SWPM 20-20-00).
NOTE: The resistance must not be more than 0.001 ohm.
____
S 434-018
(11)
Connect the electrical connector DM713 (8) to the pump motor (7).
S 434-019
(12)
Connect the electrical connector DS435 (4) to the pump pressure switch S435 (2).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
E. Operational Test
S 864-021
(1)
Supply electrical power, if it is not already done
(AMM 24-22-00/201).
S 864-022
(2)
Remove the DO-NOT-CLOSE tag and close this circuit breaker:
(a)
P6 Main Power Distribution Panel
1) 6H18, DC FUEL PUMP APU
S 864-023
(3)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P414 Power Distribution Center-Left
1) 414R18, FUEL BOOST PUMP MAIN AFT 2
(b)
P415 Main Power Distribution Panel
1) 415M29, FUEL BOOST PUMP MAIN AFT 3
S 754-024
(4)
Remove the DO-NOT-OPERATE tag and put the APU control switch to the ON position.
S 754-035
(5)
Make sure the pump operates (audible indication or vibration).
S 864-039
(6)
Make sure this EICAS message does not show on the main EICAS display or the status page of the auxiliary EICAS display:
(a)
APU FUEL PUMP (STATUS)
S 864-025
(7)
Put the APU control switch to the STOP position.
S 864-026
(8)
Remove the DO-NOT-CLOSE tag and close these circuit breakers:
(a)
P414 Power Distribution Center-Left
1) 414R18, FUEL BOOST PUMP MAIN AFT 2
(b)
P415 Main Power Distribution Panel
1) 415M29, FUEL BOOST PUMP MAIN AFT 3
S 094-027
WARNING: USE THE PROCEDURE IN AMM 32-00-30/201 TO REMOVE THE DOOR LOCKS.
_______ THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(9)
Remove the wing and body gear door locks (AMM 32-00-30/201).
(10)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 864-028
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A
747-400 MAINTENANCE MANUAL
APU FUEL SHUTOFF VALVE ACTUATOR - REMOVAL/INSTALLATION
______________________________________________________
1. General
_______
A. This procedure has two tasks:
(1)
A task to remove the APU fuel shutoff valve actuator.
(2)
A task to install the APU fuel shutoff valve actuator.
TASK 28-25-02-004-001
2. APU Fuel Shutoff Valve Actuator Removal (Fig. 401)
_______________________________________
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