(2)
Remove the clamp.
(3)
Disconnect the fuel line from the upper shroud.
G. Disconnect bleed load control air line from bleed air valve. Cap and plug fittings.
H. Disconnect fire detection sensor element receptacle from fitting in upper shroud.
I. Disconnect fire extinguisher line from fitting in upper shroud.
500
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Upper Shroud Installation 508
49-12-31 Figure 401 (Sheet 1) Feb 01/96
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528 Upper Shroud Installation
Feb 15/70 Figure 401 (Sheet 2) 49-12-31
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Upper Shroud Installation 525
49-12-31 Figure 404 (Sheet 3) Aug 15/71
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503 Upper Shroud Installation Feb 01/96 Figure 401 (Sheet 4) 49-12-31 Page 404A/404B BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
J. Disconnect upper shroud to airplane structure bonding jumper (Fig. 401, Sheet 3, Detail B).
K. Disconnect the bleed air line from the fitting of the control valve for the fuel sensing flow in the upper shroud.
L. Remove flexible connector, duct end and clamp from bleed air duct.
M. Remove screws securing bleed air duct to outer surface of shroud, move duct outboard to clear shroud and temporarily secure bleed air duct to the APU compartment.
N. Disconnect overheat detector from shroud where applicable.
O. Remove nuts, washers, and bolts attaching vertical and axial ring mount struts to left aft ring mount.
NOTE: Ring mount struts vary in length. Do not remove from airplane mount brackets unless necessary.
P. Remove nut, washer, and bolt attaching ring mount strut to left forward ring mount.
Q. Remove nuts, washers, and bolts, attaching axial, vertical, and lateral ring mount struts to right aft ring mount.
R. Remove nuts, washers, and bolts attaching vertical and lateral ring mount struts to right forward ring mount.
S. Carefully remove upper shroud from APU compartment.
CAUTION: BE CAREFUL WHEN YOU REMOVE THE UPPER SHROUD FROM THE APU COMPARTMENT. DAMAGE TO THE INSPECTION PORT FOR THE AIR INLET DUCT AND THE UPPER SHROUD CAN OCCUR.
T. If shroud is to be replaced, remove cooling air shutoff valve (AMM 49-51-21/401) and fuel heater (AMM 49-31-61/401) (where applicable) from shroud.
3. Install Upper Shroud (Fig. 401)
A. If cooling air shutoff valve and fuel heater were removed in 2.T., install valve
(AMM 49-51-21/401) and fuel heater (AMM 49-31-61/401) on new shroud.
B. Make sure the bleed air duct is temporarily attached in the APU compartment before you install the upper shroud.
C. Carefully raise upper shroud into APU compartment, aligning compressor air inlet opening in shroud with compressor air inlet duct.
NOTE: Put the inspection port for the air inlet duct into the lightning hole of the horizontal web during upper shroud installation.
May 01/03 49-12-31 Page 405 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
D. Attach vertical and lateral ring mount struts to right forward ring mount with bolts, washers, and nuts.
E. Attach axial, vertical, and lateral ring mount struts to right aft ring mount with bolts, washers, and nuts.
F. Attach ring mount strut to left forward ring mount with nut, washer, and bolt.
G. Attach vertical and axial ring mount struts to left aft ring mount with bolts, washers, and nuts.
H. Attach overheat detector to shroud where applicable.
I. Insert bleed air duct elbow into upper shroud and secure with screws.
J. Connect flexible connector, duct end and clamp to bleed air duct.
K. Connect fire detection sensor element receptacle to fitting in upper shroud.
L. Connect fire extinguisher line to fitting in upper shroud.
M. Connect bleed load control air line to bleed air valve.
N. Connect the fuel line to the upper shroud.
(1)
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