supply port on the pneumatic test box and the other end to the 45 degree fitting in the supply port.
5) Connect one end of the regulated pressure (yellow) hose to the regulated pressure port of the test box and the other end to the 90 degree fitting in the temperature port.
6) Increase the supply pressure to 20 psig. 7) Slowly increase the regulated pressure to 15 psig. 8) Make sure the FAMV is fully closed.
a) Make sure the FAMV is fully closed by visually
inspecting the butterfly inside the FAMV.
b) If the FAMV is not closed, replace the FAMV
(AMM 36-12-04/401).
9) Decrease the regulated pressure to zero. 10) Decrease the supply pressure to zero.
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747-400 MAINTENANCE MANUAL
11) Install the FAMV (AMM 36-12-04/401).
S 845-053
(4)
Put the Airplane Back to Its Usual Condition.
(a)
Remove the fittings and replace the connections.
NOTE: Make sure the anti-seize compound is applied to all
____ the male threads before connecting the pneumatic control/supply lines.
(b) Visually inspect the pneumatic lines and fittings to and from the FAMV. 1) If loose or damaged, repair or replace are necessary.
L. Final System Test
S 795-060
(1)
Do these steps to do the system leak check:
(a)
Pressurize the pneumatic system using a ground cart, the APU or pneumatic air to 40 psig (AMM 36-00-00/201).
(b)
Manually wrench open the PRSOV (AMM 36-11-04/201).
(c)
Manually wrench open the PRV (AMM 36-11-19/201).
NOTE: You must manually wrench open the PRSOV and PRV to
____
permit air to the HPSOV.
(d)
Do a leak check of all units tested in this health check with a soap solution.
(e)
Put the BLEED switches on the P5 panel to the OFF position.
(f)
Make sure the OFF lights come on. 1) If the OFF lights are not on, select cowl thermal anti-ice on and make sure the OFF light comes on.
2) If the OFF light does not come on after selecting cowl thermal anti-ice, replace the PRSOV (AMM 36-11-04/201).
(g)
Depressurize the pneumatic system (AMM 36-00-00/201).
(2)
Do the CMC BLEED SYS ELEC Ground Test (AMM 36-00-22/501)
S 845-056
(3)
Make sure all ATA 36 (pneumatic system) EICAS messages are cleared.
S 715-055
M. Put the Airplane Back to Its Usual Condition
S 415-065
WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
(1) Close the right thrust reverser (416/426/436/446) for the applicable engine (No. 1/2/3/4) (AMM 78-31-00/201).
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(2) S 415-066Close the right core cowl panel (418/428/438/448) for the applicable engine (No. 1/2/3/4) (AMM 71-11-06/201).
(3) S 415-069Close the right fan cowl panel (414/424/434/444) for the applicable engine (No. 1/2/3/4) (AMM 71-11-04/201).
(4) S 865-067Do the activation procedure for the thrust reverser (AMM 78-31-00/201).
(5) S 865-068Remove electrical power if it is not necessary (AMM 24-22-00/201).
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747-400 FAULT ISOLATION/MAINT MANUAL
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