(2)
Remove the two bolts, the four washers, and the two locknuts that attach the front tube to the inlet case elbow.
(3)
Remove the three locknuts and the washers that attach the inlet case elbow to the inlet case.
(4)
Remove the elbow from the inlet case and discard the gasket.
(5)
Pull the front tube towards the front of the engine to remove it from the anti-icing valve support and the engine.
D. On the engines with P&W SB 5872, do these steps:
(1)
Remove the three bolts and the washers that attach the front tube elbow to the inlet case.
(2)
Remove the two bolts and the nuts that attach the front tube clamp to the inlet case bracket.
(3)
Remove the two bolts and the nuts that attach the two half clamps on the sealing sleeve to the compressor case bracket.
(4)
Remove the bolts, the nuts, and the washers that attach the sealing sleeve for the front tube to the anti-icing valve.
(5)
Remove the front tube from the engine.
500
Oct 20/91 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 75-11-51 Page 401
G42807G42810
Engine Anti-Icing Air Front Tube Installation 500
75-11-51 Figure 401 (Sheet 1) Oct 20/91
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Engine Anti-Icing Air Front Tube Installation
Oct 20/91 Figure 401 (Sheet 2) 75-11-51
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
3. Anti-Icing Air Front Tube Installation (Fig. 401)
A. On the engines without P&W SB 5872, do these steps:
(1)
Put the front tube in the flange on the anti-icing valve support.
(2)
Attach the inlet case elbow to the front tube with the two bolts, the four washers, and the two locknuts. Tighten the locknuts.
(3)
Attach the elbow with a new gasket to the inlet case with the three washers and the locknuts. Tighten the locknuts.
(4)
Attach the front tube clamp to the inlet case bracket with the bolt and the nut.
B. On the engines with P&W SB 5872, do these steps:
(1)
Put the front tube assembly in its position on the engine.
(2)
Attach the sealing sleeve on the front tube to the anti-icing valve with the four bolts, the washers, and the locknuts. Tighten the locknuts.
(3)
Attach the half clamps for the sealing sleeve to the compressor case bracket with the bolts and the locknuts. Do not tighten the locknuts at this time.
(4)
Attach the front tube clamp to the inlet case bracket with the bolts and the locknuts. Do not tighten the locknuts at this time.
(5)
Attach the front tube elbow with a new gasket to the inlet case with the washers and the bolts. Tighten the bolts. Install lockwires on the bolts.
(6)
Tighten the locknuts on the half clamps for the sealing sleeve and the front tube clamp.
C. Connect the electrical connector to the anti-icing valve.
500
75-11-51 Page 404 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Oct 20/91
NOSE COWL ANTI-ICING DUCT - REMOVAL/INSTALLATION
1. General
A. The nose cowl anti-icing duct is located on the right side of each engine. The forward end of the duct is attached to the engine nose cowl and the aft end is attached to the thermostatic valve.
2. Remove the Nose Cowl Anti-icing Duct (Fig. 401)
A. Open the right side removable cowl panel.
B. Loosen the duct forward coupling nut at the location the duct goes into the nose cowl.
C. Remove the connecting ring from the forward location and keep for the installation.
D. Loosen the duct aft coupling nut from the thermostatic valve.
E. Manually support the duct and remove the screws, nuts and two clamps.
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