(2)
Get access to the boot assembly.
S 015-031
NOTE: The boot assembly is mounted to the pan assembly which is
____ attached to the aft side of the aft pressure bulkhead.
S 035-015
(3) Loosen the coupling at the boot assembly.
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A 737-300/400/500MAINTENANCE MANUAL
STA
A-A
APU Supply Duct Inspection
Figure 501
C47080
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S 025-016
(4)
Remove the bolts that attach the boot assembly to the pan assembly.
S 035-017
(5)
Move the boot assembly away from the pan assembly.
S 215-018
(6)
Examine the pan assembly for signs of wear or discoloration.
(a) Replace the pan assembly, if necessary.
S 215-019
(7) Examine the APU supply duct for signs of interference against the web and doubler at the access cutout for the aft pressure bulkhead.
(a) The nominal clearance requirement between the APU supply duct and the access cutout is 0.20 inch.
S 215-020
(8) If there is not sufficient clearance between the APU supply duct and the access cutout at the aft pressure bulkhead, do the APU supply duct adjustment procedure.
TASK 36-19-15-805-015
3. APU Supply Duct Adjustment (Fig. 502)
__________________________
A. References
(1) AMM 53-21-00/401, Passenger Cabin Floors
B. Access
(1)
Location Zone (AMM 12-31-01/201)
108 Aft Passenger Cabin Area
701 Tail Compartment
(2)
Access Panels (AMM 12-31-31/201, 12-31-41/201)
3701L Stabilizer Trim Access Door
4601L Aft Entry Door
C. Procedure
S 035-021
(1)
Loosen all the V-band couplings behind the aft pressure bulkhead, between STA 1042 to STA 1093.
S 015-022
(2)
Remove the passenger cabin floor panels located forward of the aft pressure bulkhead near the left aft entry door (AMM 53-21-00/401).
NOTE: It may be necessary to remove the lavatory or galley
____ compartment to get access to the applicable floor panels.
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S 215-032
(3) Examine the rounded flanged lip on the lower support bracket assembly, does it point forward (View A-A, Fig. 502)? (a) No, remove the lower support bracket assembly and install it with the rounded flanged lip on the bracket pointed forward, this will help to move the duct about 0.14 inch more outboard. 1) If the duct interference problem with the web and doubler at the access cutout for the aft pressure bulkhead is still not cleared, continue on to the next step. (b) Yes, continue.
S 015-030
(4) Loosen all V-band couplings on the APU supply ducts forward of the aft pressure bulkhead between STA 978 and STA 1023.
S 015-004
(5) Loosen the support clamps at STA 927 and STA 967.
S 025-021
(6) Remove the coupling from the lower support bracket at STA 1016.
S 825-022
(7) Move the lower support bracket up to allow the duct to move more freely.
S 115-007
(8) With the duct assembly in an unrestrained state, put a temporary shim (0.20 inch thick) between the duct and the forward-inboard side of the pan assembly (View B, Fig. 502).
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