D.
Procedure
S 684-128
(1)
Open the sump drain valve to make sure there is no fuel or water in the APU fuel line shroud (AMM 12-11-04/301).
(2)
Supply electrical power (AMM 24-22-00/201).
S 864-130
(3)
Make sure these circuit breakers are closed:
(a)
On the main power distrbution panel, P6: 1) 6E3, APU FUEL VALVES 2) 6H23, L FWD FUEL BOOST PUMP
S 864-129
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MAINTENANCE MANUAL
(4) S 864-131Make sure the APU fire switch on the pilot's aft control stand, P8, is in the NORMAL position.
(5) S 864-132Set the MAIN BATTERY switch on the battery standby power panel, on the P5 panel, to the ON position.
S 864-142
CAUTION: DO NOT PUT THE APU MASTER CONTROL SWITCH TO THE "START"
_______ POSITION. THE APU COULD START AND CAUSE DAMAGE.
(6) Set the APU start switch to the ON position.
NOTE: This step opens the APU shutoff valve and operates the
____ left forward fuel boost pump. This will pressurize the APU fuel line.
(a)
Make sure someone is in the flight compartment when the fuelboost pump operates to continuously monitor for the PRESSlight.
(b)
Make sure the L PUMP FWD PRESS light on the P5 panel goes off.
1) If the L PUMP FWD PRESS light stays on, push the L PUMP FWDswitch-light to the OFF position.
S 794-134
(7)
Operate the left forward boost pump for a minimum of two minutes.
S 864-135
(8)
Set the APU start switch to the OFF position.
S 864-136
(9)
Set the MAIN BATTERY switch to the OFF position.
S 794-135
(10)
Examine the applicable flex fittings on the APU fuel line and shroud for indications of fuel leakage.
NOTE: Examine the flex fittings on the part(s) of the fuel line
____ and shroud that you replaced. (For example, the flex fitting at the center tank, the APU firewall, and the aft pressure bulkhead).
S 794-136
(11) After a minimum of five minutes, open the sump drain valve for the APU shroud drain line and do a check for fuel (AMM 12-11-04/301).
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