S 865-032
(8)
Do these steps to pressurize the pneumatic crossover duct:
(a) Use the APU air source or a ground air source to put pressure at the ejector inlet.
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747-400 MAINTENANCE MANUAL
(b) Do these steps for an optional method to put the pressure on the injector inlets: 1) Disconnect the hose at approximately STA 971, WL 96, RBL 5
for the S2276 ejector in the fwd lower cargo comapratment and STA 1530, WL 104, BL 0.0 for the S2277 ejector in the aft lower cargo compartment.
2) Use the correct connector to put the dry, regulated air in the bleed air inlets of the two ejectors.
NOTE: Use a maximum air pressure of 50 psig and a
____ minimum air pressure 20 psig.
(c) Make sure that the pressure is a minimum of twenty inches of water at the manometer.
S 735-033
(9)
Make sure that the needle valve between the ejector body and the pressure switch is closed.
S 835-120
(10)
Make sure that the "CGO DET AIR MD1" (STATUS) and "CARGO DET AIR" (ADVISORY) EICAS messages show and the "CGO DET AIR MD2", "CGO DET AIR LL1" and CGO DET LL2" do not show on the EICAS lower display.
NOTE: The messages will show after one minute.
____
S 865-036
(11)
Slowly open the needle valve to put the pressure on the pressure switch.
(12)
Make sure that the EICAS messages do not show.
S 975-096
(13)
Make a note of the pressure on the manometer (in inches of water) when the EICAS advisory message "CARGO DET AIR" goes off the display.
(14)
Make sure that the pressure is a minimum of twenty inches of water.
S 715-033
S 975-038
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S 865-042
(15) Slowly open the needle valve until it is fully open.
NOTE: This will remove the pressure from the vacuum switch.
____
S 865-034
(16) Set the fuel control switches for the engines 1 and 4 to CUTOFF.
S 865-035
(17) Remove the DO-NOT-CLOSE tag and close these circuit breakers:
(a) P6 Main Power Distribution Panel
1) 6F1 IGN 1 ENG 1
2) 6F4 ENG 1 ENG 4
3) 6G1 FUEL SHUTOFF VALVE ENG 1
4) 6G4 FUEL SHUTOFF VALVE ENG 4
5) 6G19 STBY IGN ENG 1
6) 6G22 STBY IGN ENG 4
7) 6J18 ENG START AIR CONT
8) 6K19 IGN 2 ENG 1
9) 6K22 IGN 2 ENG 4
10) 6L10 FUEL CONT VALVE ENG 1
11) 6L13 FUEL CONT VALVE ENG 4
S 865-044
(18) Get access to the MENU on the CMCS.
S 865-045
(19) Push the LSK adjacent to CMC on the menu.
S 865-046
(20) Push the LSK key adjacent to the "PRESENT LEG FAULTS" on the menu.
S 865-100
(21) Push the LSK adjacent to "NEXT PAGE" until the message "CGO DET AIR MD1" shows.
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S 865-110
(22) Remove the pressure from the pneumatic crossover duct
(AMM 36-00-00/201).
NOTE: Do not do this if you will do the the leakage test. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 防火 FIRE PROTECTION 1(62)
