6. Install Fuel Boost Pump
A. Lift fuel boost pump into dry bay through access opening, or onto front spar, whichever is applicable, inserting end of fuel boost pump ports into their mating fittings. Swing out mounting clamps as necessary to clear pump flange and push pump straight in until pump flange is against mating surface.
B. Push up the mounting clamps and install mounting bolts.
C. Connect electrical connector to fuel boost pump.
D. Check electrical bond between boost pump and airplane structure (AMM 20-22-01/601). Resistance shall not exceed 0.0002 ohm.
E. Manually open the boost pump removal valve.
(1) After installation of center wing tank boost pump, also open removal valve for opposite center wing tank boost pump.
F. Verify that fuel boost pump is primed.
(1)
Deleted.
(2)
Make sure the fuel tank has a minimum of 700 pounds (350 kilograms) of fuel.
(3)
Make sure the manual defueling valve is closed.
(4)
Deleted.
(5)
Close fuel system indicator lights circuit breakers on aft overhead panel (P6).
(6)
Remove DO-NOT-CLOSE identifier and close applicable boost pump circuit breaker on P6 panel. If boost pump is for tank No. 1 or 2, check that LOW PRESSURE indicating light on P5 panel is on.
(7)
If boost pump is for center tank, close master DIM AND TEST circuit breaker on P6 panel and press-to-test applicable boost pump LOW PRESSURE indicating lights on forward overhead panel (P5). Make sure the bulb comes on.
(8)
Put the applicable boost pump switch on P5 panel to ON position.
(a) To operate any of the fuel boost pumps, you must be in the flight compartment to continuously monitor the fuel quantity and the low pressure indication in the fuel tank.
WARNING: DO NOT OPERATE ANY FUEL BOOST PUMP IF THE LOW PRESSURE LIGHT COMES ON AND STAYS ON. FUEL VAPORS IN THE TANK MAY IGNITE AND CAUSE A FIRE OR EXPLOSION.
1) Immediately put the applicable fuel boost pump switch(es) to OFF if the LOW PRESSURE light comes on and stays on.
NOTE: When defueling or transferring fuel with minimum backpressure to the pumps, it is possible for the low pressure light(s) to be on. In this case, monitor the tank quantity and put the pump switch(es) to OFF if the tank quantity is not changing.
(9)
If boost pump is for tank No. 1 or 2, check that applicable LOW PRESSURE indicating light on P5 panel goes off when pressure builds up.
(10)
If boost pump is for center tank, check that LOW PRESSURE indicating light on P5 panel illuminates briefly after pump switch is turned on and extinguishes after pump builds up fuel pressure.
(11)
If indicator light response was satisfactory in step (9) or (10), proceed to step (15). If indicator light did not extinguish, proceed to step (12).
(12)
Return boost pump switch on P5 panel to OFF and open boost pump and indicator light circuit breakers on P6 panel.
(13)
Reprime pump as follows:
(a)
Open drain valve in bottom of pump casing (Fig. 401) until fuel runs out; then close drain. If fuel does not appear, perform step (b).
(b)
If fuel does not appear at drain in step (a), use the following priming method: 1) Manually close fuel boost pump removal valve . 2) Inject fuel into pump drain valve using boost pump priming bottle (Fig. 402). Use
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May 01/03 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 28-22-41 Page 405
at least three fourths of a ful1 bottle of fuel. 3) Open fuel boost pump removal valve and immediately continue with pump prime check.
(14)
Repeat steps 6.E.(4) thru 6.E.(11).
(15)
Return boost pump switch on P5 panel to OFF.
7. Return Airplane to Normal
A. Deleted.
B. Close all fuel system circuit breakers on P6 panel. Remove DO-NOT-CLOSE identifiers.
C. Install boost pump access panel. If boost pump is on front spar, instal1 small clearance panel below removal valve handle. Ensure that retaining chain is not pinched between panel and stringers before tightening screws.
CAUTION: CHECK L.E. FLAP NOSE TO FUEL BOOST PUMP CLEARANCE (REF 27-81-0 A/T). DAMAGE TO FLAPS OR BOOST PUMP MAY RESULT FROM INADEQUATE CLEARANCE.
NOTE: Insure that boost pump removal valve is open before installing boost pump access panel.
D. If extended, remove actuator locks and retract leading edge flaps (Ref 27-81-0 MP). Ensure that there is no interference between flap and FWD boost pump as flap retracts.
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