75-24-02
ALL ú ú N06 Page 412 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
4) Loosen the clamp bolt which attaches the tube for the main oil filter to the bracket on the flange of the deoiler outlet tube.
5) Move the bracket away from the deoiler outlet tube. 6) Move the bracket which attaches the EEC alternator leads away from the flange of the deoiler outlet tube. 7) Move the deoiler outlet tube to get clear access to the TVC air duct. 8) Discard the packing.
(c)
Remove the bolts and washers which attach the support bracket for the pneumatic line to the bracket on the forward flange of the TVC air duct.
(d)
Remove the bolts, washers, and nuts which attach the support bracket for the engine fire detector element to the bracket on the forward flange of the TVC air duct.
(e)
ENGINES PRE-PW-SB 75-114; Remove the lockwire and the bolts which attach the forward flange of the TVC air duct and the brackets to the pad on the HPC case.
(f)
ENGINES POST-PW-SB 75-114; Remove the bolts which attach the forward flange of the TVC air duct and the brackets to the pad on the HPC case. 1) Move the bracket which holds the support brackets for the
pneumatic line and the engine fire detector element for the removal of the TVC air duct.
(g)
Loosen the clamp bolts which attach the two oil pressure tubes to the bracket at the forward flange of the TVC air duct. 1) Move the bracket for the removal of the TVC air duct.
CAUTION: REMOVE THE BORESCOPE PLUG, IF IT IS INSTALLED, FROM THE
_______ ELBOW OF THE NO. 3 TVC AIR DUCT BEFORE YOU REMOVE THE TVC AIR DUCT. IF YOU DO NOT DO THIS, YOU CAN CAUSE DAMAGE TO THE BORESCOPE PLUG.
(h)
ENGINES WITH A BORESCOPE PLUG IN THE TVC AIR DUCT; Do the steps that follow: 1) Remove the bolts which attach the borescope plug to the aft
elbow of the TVC air duct.
2) Use the two jackscrews (0.190-32 thread), if it is
necessary, while you remove the borescope plug.
3) Discard the gasket for the borescope plug.
(i)
Remove the bolts which attach the aft flange of the TVC air duct to the boss on the HPT case.
(j)
Remove the bolts, nuts, and clamp which attach the TVC air duct to the bracket on the diffuser case.
(k) Remove the TVC air duct from the engine. 1) ENGINES WITHOUT PHASE 3 CHANGES AND PRE-PW-SB 72-315; Discard the metering orifice seal plate on the boss on the HPC case.
2) ENGINES WITH PHASE 3 CHANGES OR POST-PW-SB 72-315;
Discard the gasket on the boss on the HPC case.
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75-24-02
ALL ú ú N04 Page 413 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
3) ENGINES WITHOUT PHASE 3 CHANGES AND PRE-PW-SB 72-315 OR POST-PW-SB 75-57; Discard the gasket on the boss on the HPT case.
4) ENGINES WITH PHASE 3 CHANGES OR POST-PW-SB 72-315 OR PRE-PW-SB 75-57; Remove and discard the metering orifice seal plate from the boss on the HPT case.
(l) Install the protection caps to the TVC air duct and the openings on the HPC and HPT cases.
TASK 75-24-02-004-033-N00
5. Remove the No. 4 Turbine Vane Cooling Air Duct (Fig. 402)
______________________________________________
A. References
(1)
AMM 71-11-04/201, Fan Cowl Panels
(2)
AMM 71-11-06/201, Core Cowl Panels
(3)
AMM 78-31-00/201, Thrust Reverser System
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 大气 AIR 1(57)
