(19)
Disconnect the electrical connector, DV351 from the applicable engine start valve (Refer to AMM 80-11-02/401 to get access to the start valve).
S 866-115
(20)
Close the 6J18 ENG START AIR CONT circuit breaker.
S 866-117
(21)
Put the applicable ENGINE BLEED switch in the ON position.
S 866-118
(22)
Pull out the applicable engine START switch on the P5 overhead panel.
S 866-119
(23)
Slowly decrease the pressure in the pneumatic system to 20-24 psig.
S 986-120
WARNING: USE A RATCHET WRENCH TO TURN THE PRV MANUAL OVERRIDE DRIVE.
_______ THE PRV MAY OPEN SUDDENLY WHEN YOU TURN THE MANUAL OVERRIDE DRIVE. THE MANUAL OVERRIDE DRIVE COULD PULL THE WRENCH OUT OF YOUR HANDS IF YOU DO NOT USE A RATCHET-DRIVE WRENCH.
(24)
Carefully turn the PRV manual override drive on the applicable engine to the OPEN position.
(a)
Make sure the PRV stays in the open position.
S 866-121
(25)
Increase the pneumatic system pressure to 44-46 psig.
S 796-122
(26)
Examine all of the ducts and couplings forward of the PRSOV for condition and leakage.
NOTE: A small amount of leakage is permitted from the
____ joints. There must not be a high concentration of leakage from the joints. A high concentration of air flow can be felt by the hand at a distance of 12 inches from the leakage source.
S 866-123
(27) Push in the applicable engine START switch.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
36-11-00
ALL ú ú 05 Page 618 ú Feb 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 866-124
(28) Let the pneumatic system pressure decrease to 0 psig.
S 866-127
(29) Open the 6J18 ENG START AIR CONT circuit breaker.
S 796-128
(30) Do this test again on the remaining engines, as applicable.
S 436-129
(31) Connect the electrical connector, DV351 to the engine start valve.
S 866-130
(32) Remove the DO-NOT-CLOSE tags and if necessary, close these circuit breakers:
(a) P6 Main Power Distribution Panel
1) 6F01 ENG 1 IGN 1
2) 6F02 ENG 2 IGN 1
3) 6F03 ENG 3 IGN 1
4) 6F04 ENG 4 IGN 1
5) 6G19 STBY IGN ENG 1
6) 6G20 STBY IGN ENG 2
7) 6G21 STBY IGN ENG 3
8) 6G22 STBY IGN ENG 4
9) 6J18 ENG START AIR CONT
10) 6K19 ENG 1 IGN 2
11) 6K20 ENG 2 IGN 2
12) 6K21 ENG 3 IGN 2
13) 6K22 ENG 4 IGN 2
14) 6L10 ENG 1 FUEL CONT VLV
15) 6L11 ENG 2 FUEL CONT VLV
16) 6L12 ENG 3 FUEL CONT VLV
17) 6L13 ENG 4 FUEL CONT VLV
S 866-131
(33) Remove the electrical power (AMM 24-22-00/201).
S 416-132
(34) Close the thrust reverser halves (AMM 78-31-00/201).
S 416-133
(35) Install these section 42 wing/body fairings (AMM 06-09-02/201):
(a) 191AJ
(b) 192AJ.
S 416-134
(36) Close (or install, as applicable) these section 44 access doors and panels (AMM 06-09-03/201):
(a) 191CL and 192CR
(b) 191EL
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
36-11-00
ALL ú ú 05 Page 619 ú Feb 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(c)
191JL
(d)
191KL and 192KR
(e)
191ML and 192MR
(f)
191NL and 192NR
(g)
192HR.
S 416-135
(37)
Close these strut access panels (AMM 06-09-09/201):
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 氣動系統 PNEUMATIC SYSTEM(53)
