2) Remove the bolt that attaches the clamp to the loop clamp bracket.
(d)
Disconnect the tube nut at the Flange M from the coupling.
(e)
Remove the bolt and nut which attach the tube clamp to the
bracket on the Flange P.
(f)
Remove the bolts and nuts which attach the tube clamps to the brackets on the Flange N.
(g)
Remove the oil scavenge tube from the engine.
(h)
Install protection caps to the openings in the oil scavenge
tube.
S 014-072-N00
(5)
ENGINES POST-PW-SB 79-76; For the upper cooling air tubes, remove the oil scavenge tube for the No. 4 bearing with the steps that follow:
(a)
ENGINES PRE-PW-SB 79-75;
Do the steps that follow:
1) Remove the hose clamp at the forward end of the shield
(View AU). 2) Remove the bolt and the nut that attach the clamp at the rear side of the shield. 3) Remove the shield.
(b)
ENGINES POST-PW-SB 79-75; Do the steps that follow: 1) Remove the bolt that attaches the clamp to the bracket at
the Flange M location (View AU).
2) Remove the hose clamp that attaches the forward end of the shield. a) Remove the shield.
(c)
Disconnect the tube nuts of the scavenge tubes for the No. 4
bearing at the Flange M and Flange N locations (Views AM and
AU).
(d)
Disconnect the elbow end of the rear scavenge tube for the
No. 4 bearing from the internal tube on the turbine exhaust
case (View AN).
(e)
Remove the eight bolts that attach the clamps for the scavenge tubes for the No. 4 bearing (Views AS, AT, AO, AP, AQ and AR).
(f)
Remove the four bolts and nuts that attach the clamps for the scavenge tubes for the No. 4 bearing (Views AE, AG, AH and AM).
(g)
Remove the two scavenge tubes for the No. 4 bearing from the
engine.
(h)
Install protection caps to the open ends of the scavenge tubes for the No. 4 bearing.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
75-24-09
ALL ú ú N02 Page 422 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 014-007-N00
(6) For the two upper aft cooling air tubes, remove the upper support bracket on the flange P with the steps that follow:
(a)
Remove the bolts and nuts which attach the support bracket to the Flange P.
(b)
Remove the upper support bracket.
S 014-008-N00
(7) For the lower cooling air tubes, disconnect the wire harness and support tube clamps on the LPT case for easier access with the steps that follow:
(a)
Remove the bolt and nut which attach the support tube clamp to the bracket on the Flange P at the 5:30 o'clock position.
(b)
Remove the bolt and nut which attach the support tube clamp to the angle bracket on the bridge bracket at the 5 o'clock position.
(c)
Remove the bolt and nut which attach the support tube clamp to the bracket on the Flange N at the 4:30 o'clock position.
S 014-073-N00
(8) ENGINES POST-PW-SB 79-76; For the lower cooling air tubes, remove the oil pressure tube for the No. 4 bearing with the steps that follow:
(a)
Remove the hose clamps to remove the three shields from the pressure tubes for the No. 4 bearing (View AA, AK and AL).
(b)
Disconnect the tube nut of the rear pressure tube for the No. 4 bearing from the strainer housing (View AA).
(c)
Remove the strainer element and the packing from the strainer housing. 1) Discard the packing.
(d)
Remove the strainer housing from the internal tube nut on the turbine exhaust case.
(e)
Disconnect the forward tube nut of the pressure tube for the No. 4 bearing (View AL).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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 大氣 AIR 1(101)
