747-400 AMM 飞机维护手册 大气 AIR 1(108)

 safety cable ferrule.

 (l)  
Tighten the tube nut at the Flange M to 475-525 pound-inches (53.7-59.3 newton-meters). 1) Safety the tube nut with lockwire or safety cable and

 safety cable ferrule.

 (m)  
ENGINES PRE-PW-SB 79-75; Do the steps that follow: 1) Install the spray shield on the forward tube connection to

 the inboard side of the Flange M. 2) Attach the aft end of the spray shield with the clamp. 3) Attach the forward end of the spray shield with the hose
 clamp. 4) Lubricate the threads of the bolt, which attaches the aft end clamp to the Flange M bracket, with engine oil. 5) Attach the aft end clamp to the Flange M bracket with the bolt and nut. 6) Tighten the hose clamp at the forward end to 15-18 pound-inches (1.7-2.0 newton-meters). 7) Tighten the clamp bolt to 36-40 pound-inches (4.1-4.5 newton-meters).
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 75-24-09
 ALL  ú ú N02 Page 435 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
(n)  ENGINES POST-PW-SB 79-75;
 Do the steps that follow:
 1) Install the shield on the forward tube connection of the

 oil scavenge tube for the No. 4 bearing. 2) Attach the shield with the hose clamp. a) Tighten the hose clamp to 15-18 pound-inches (1.7-2.0 newton-meters). 3) Lubricate the threads of the attaching bolt of the clamp with engine oil.
 4)  Attach the clamp of the oil scavenge tube for the No. 4 bearing to the loop clamp bracket with the bolt. a) Tighten the bolt to 36-40 pound-inches (4.1-4.5
 newton-meters).
 S 414-078-N00
 (10)
 ENGINES POST-PW-SB 79-76; For the upper cooling air tubes, install the scavenge tubes for the No. 4 bearing with the steps that follow:

 (a)  
Remove the protection caps from the open ends of the scavenge tubes for the No. 4 bearing.

 (b)  
Lubricate the attaching bolts of the clamps of the scavenge
 tubes for the No. 4 bearing with engine oil.

 (c)  
Put the forward scavenge tube for the No. 4 bearing in position on the engine.

 (d)  
Connect the forward scavenge tube for the No. 4 bearing to the tube nut at the Flange M location (View AU). 1) Tighten the tube nut with your hand.

 (e)  
ENGINES PRE-PW-SB 79-75;
 Install the two bolts that attach the clamps for the forward
 scavenge tube for the No. 4 bearing (Views AS and AT).
 1) Tighten the bolts with your hand.

 (f)  
ENGINES POST-PW-SB 79-75; Install the three bolts that attach the clamps for the forward scavenge tube for the No. 4 bearing (Views AS, AT and AU). 1) Tighten the bolts with your hand.

 (g)  
Install the four bolts and nuts that attach the clamps for the forward scavenge tube for the No. 4 bearing (Views AM, AH, AG and AE). 1) Tighten the bolts with your hand.

 (h)  
Lubricate the threads of the internal tube nut on the turbine exhaust case with engine oil (View AN).

 (i)  
Put the aft scavenge tube for the No. 4 bearing in position on the engine.

 (j)  
Connect the forward tube nut to the forward scavenge tube for the No. 4 bearing (View AM). 1) Tighten the tube nut with your hand.

 (k)  
Connect the elbow-end of the scavenge tube for the No. 4
 bearing to the internal tube nut on the turbine exhaust case
 (View AN).
 1) Tighten the tube nut with your hand.

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