F99890 G00008
APU mounts 528
49-13-0 Page 2 Figure 1 (Sheet 1) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 15/70
528 APU Mounts
Feb 15/70 Figure 1 (Sheet 2) BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 49-13-0 Page 3
APU ENGINE MOUNTS - REMOVAL/INSTALLATION
1.
General This section covers the removal/installation of the APU engine mounts, consisting of vibration isolators and engine mount brackets. To gain access to the engine mounts, the APU power plant must first be removed. If a vibration isolator alone is to be replaced, the power plant is removed and the isolator taken off. It is not necessary to remove the engine mount bracket in this case.
2.
Removal/Installation APU Engine Mount Brackets From Shroud (Fig. 401)
A. Remove APU Engine Mount Bracket From Shroud
(1)
Lower APU power plant onto aero stand (AMM 49-11-0/401).
(2)
Remove nuts, washers, and bolts attaching engine mount bracket to upper shroud, and remove bracket.
(3)
Look at the rubber cushion of the vibration isolator for these problems:
(a)
Separations more than 1/8 inch in depth or longer than 1/2 the distance around the vibration isolator are not permitted.
(b)
Cracks more than 1/8 inch in depth are not permitted.
(c)
Displacements more than 0.04 inch (radial) or 0.06 inch (axial) are not permitted.
(4)
If necessary to remove vibration isolator, remove cotter pin, nut, and washers and remove isolator.
B. Install APU Engine Mount Bracket to Shroud
(1)
If vibration isolator was removed in paragraph A, install vibration isolator with washers and nut.
(2)
Tighten nut to torque value of 25 pound-feet. Install cotter pin.
(3)
Attach engine mount bracket to upper shroud with bolts, washers and nuts. Torque the nuts to 50-75 lb-ins for lubricated bolts and 65-100 lb-ins for dry bolts. Install safety wire.
(4)
Install APU power plant (AMM 49-11-0/401).
3.
Removal/Installation APU Engine Mount Brackets From Engine (Fig. 401)
A. Remove APU Engine Mount Bracket From Engine
(1)
Lower APU power plant onto aero stand (AMM 49-11-0/401).
(2)
Remove bolts attaching engine mount bracket to engine and remove bracket.
B. Install APU Engine Mount Bracket to Engine
(1)
Attach engine mount bracket with bolts. Torque the bolts to 216-408 lb-ins. Safety wire to engine.
(2)
Install APU power plant (AMM 49-11-0/401).
500
Apr 01/97 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 49-13-11 Page 401
G00104F03234 F03261 F88186
APU Engine Mounts Installation 500
49-13-11 Figure 401 May 15/68
Page 402
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 APU Engine Mounts Installation
Aug 01/95 Figure 401 (Sheet 2) 49-13-11
Page 403
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
APU Engine Mounts Installation 501
49-13-11 Figure 401 (Sheet 3) Aug 01/96
Page 404
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
501 APU Engine Mounts Installation
Aug 01/96 Figure 401 (Sheet 4) 49-13-11
Page 405
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
APU AIR INLET - DESCRIPTION AND OPERATION
1. General
A. Air supply to the APU is provided through the air inlet door and ducts (Fig. 1). The air inlet door is located on the right side of the fuselage forward of the APU. The inlet air is ducted to the APU engine compressor plenum and to the accessory cooling air fan.
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