CAUTION: TO AVOID DAMAGE TO SHAFTS, ACTUATOR ASSEMBLY MUST BE SUPPORTED SO THAT WEIGHT IS NOT ON SHAFT.
(3)
If actuator assembly mounting holes do not line up with mating holes, carefully rotate actuator assembly until holes are aligned.
(4)
Install actuator assembly mounting screws.
(5)
Connect bonding jumper to actuator assembly.
(6)
Connect electrical plug to actuator assembly.
(7)
Check electrical bond between actuator assembly and airplane structure per 20-22-01 I/C. Resistance shall not exceed 0.0025 ohm.
(8)
Close APU CONT circuit breaker on P6 panel.
(9)
Position battery switch to ON.
(10)
Place APU master switch in ON position. Verify that valve override handle moves to OPEN position.
(11)
Place APU master switch in OFF position. Verify that valve override handle moves to CLOSE position.
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Oct 20/84 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-22-32 Page 401
(12)
Position battery switch to OFF.
Removal/Installation of APU Valve Body Assembly
A.
Equipment and Materials
(1) Aliphatic Naphtha TT-N-95 (Ref 20-30-31)
B.
Prepare for APU Valve Body Assembly Removal
(1)
Defuel and purge fuel tank No. 1 (Ref 28-23-0 MP and 28-10-0 MP).
(2)
Remove fuel tank No. 1 access panel No. 1 to provide access to front of wing rear spar (Ref 28-11-11 R/I).
C.
Remove APU Valve Body Assembly
(1)
Remove actuator assembly (Ref par. 2).
(2)
Gain access to valve through access panel No. 1 and rib access opening No. 1 and 2.
(3)
Place suitable container under valve to catch fuel and disconnect APU fuel line. Remove unions and retain for installation.
(4)
With one man inside fuel tank, supporting valve body assembly, second man, outside fuel tank, support adapter and remove body assembly mounting screws (Fig. 401).
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504 APU Fuel Valve Installation
Nov 15/67 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-22-32 Page 403
CAUTION: DO NOT ALLOW VALVE BODY ASSEMBLY TO FALL. DAMAGE TO WING SKIN OR FUEL TANK SEALING MAY RESULT.
D. Install APU Valve Body Assembly
(1)
Clean O-ring groove of valve body assembly and machined surface of valve body assembly and rear spar with naphtha and wipe dry with lint-free cloth.
(2)
Install new O-rings, lightly lubricated with fuel, on unions and install unions in valve body assembly.
(3)
Install new O-ring, lightly lubricated with fuel into groove on valve body assembly.
(4)
Carefully place valve body assembly into position between APU fuel line fittings.
CAUTION: DO NOT DISLODGE OR PINCH O-RING WHEN INSERTING VALVE BODY ASSEMBLY.
(5)
With one man inside fuel tank, to position body assembly, second man, outside fuel tank, install adapter and body assembly mounting screws.
(6)
Attach APU fuel line to valve body assembly.
(7)
Install actuator (Ref par. 2).
(8)
Install fuel tank access panel. Refer to 28-11-11, Fuel Tank Access Panel - R/I.
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FUEL BOOST PUMP - REMOVAL/INSTALLATION
1. General
A. Removal/installation procedures for all boost pumps are the same. There are two boost pumps above the inboard lower surface of each wing and one boost pump on the inboard front spar of each wing. Access to AFT main or center tank pump is through its respective fuel boost pump access panel. Access to the main tank FWD pumps is gained by extending the leading edge flaps (observe WARNING below).
2. Equipment and Materials
A. Aliphatic Naphtha Cleaning Solvent - TT-N-95 (Ref 20-30-31)
B. Bonding Meter (Ref 20-22-01 I/C)
C. Bottle, Boost Pump Priming - F80203-1 (Fig. 402)
D. Leading Edge Flap Actuator Locks - F80048
3. Prepare for Fuel Boost Pump Removal
A. Provide electrical power (Ref 24-22-0 MP).
B. Check that all fuel boost pump switches, on pilot's overhead panel, are in OFF position and fuel crossfeed valve and engine fuel shutoff valves are closed.
C. Open applicable fuel boost pump circuit breaker, fuel crossfeed valve circuit breaker, and both engine fuel shutoff valve circuit breakers on P6 panel. Attach DO-NOT-CLOSE identifier to opened circuit breakers.
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