49-81-11
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
EXHAUST DUCT MUFFLER

Exhaust Duct Muffler Installation
Figure 401 (Sheet 2)

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 49-81-11
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C88172
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
S 554-002
 (3)  Keep the fire detection element for the installation of the exhaust duct muffler.
 TASK 49-81-11-004-008
 3. Exhaust Duct Muffler Removal (With the APU Removed) (Fig. 401)
___________________________________________________
 A. Access
 (1)  
Location Zones
 703 APU Compartment
 704 Tail Cone

 (2)  
Access Panels
 3801 Tail Cone Access Door
 3802 Tail Cone Access Door
 3803 APU Exhaust Duct
 3804 APU Cowl Door

 B. Procedure
 S 014-010
 (1)  
Open both of the access doors on the airplane tail cone.

 S 024-011

 (2)  
Remove the exhaust duct muffler:

 (a)  
Disconnect the electrical connector for the fire detection element on the exhaust duct muffler.

 (b)  
Remove the wiring clamp for the electrical connector of the fire detection element.

 (c)  
AIRPLANES WITH THE DUCT ALIGNMENT ASSEMBLY; Remove the bolts that attach the caps to the drip pan.

 (d)  
AIRPLANES WITH THE DUCT ALIGNMENT ASSEMBLY;
 Remove the caps from the drip pan.

 (e)  
AIRPLANES WITH THE DUCT ALIGNMENT ASSEMBLY; Remove the bolts that attach the duct alignment assembly to the brackets.

 (f)  
AIRPLANES WITHOUT THE DUCT ALIGNMENT ASSEMBLY (PRE-SB 49-1101); Remove the bolts and washers that attach the exhaust duct muffler to the heat shield.

 (g)  
Remove the exhaust duct muffler from the heat shield.

 (h)  
Remove the fire detection element from the forward end of the exhaust duct muffler.

 S 554-012
 (3)  Keep the fire detection element for the installation of the exhaust duct muffler.
 TASK 49-81-11-404-006
 4. Exhaust Duct Muffler Installation (With the APU in Position) (Fig. 401)
____________________________________________________________
 A. References
 (1)  AMM 49-81-31/401, Aft Fairing Assembly
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 49-81-11
 ALL  ú ú 02 Page 404 ú Nov 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
B. Access
 (1)  
Location Zones
 703 APU Compartment
 704 Tail Cone

 (2)  
Access Panels
 3801 Tail Cone Access Door
 3802 Tail Cone Access Door
 3803 APU Exhaust Duct
 3804 APU Cowl Door

 C. Procedure
 S 424-004
 (1)  Install the exhaust duct muffler:
 (a)  
Install the fire detection element on the forward end of the exhaust duct muffler.

 (b)  
AIRPLANES WITHOUT THE DUCT ALIGNMENT ASSEMBLY (PRE-SB 49-1101); Install the exhaust duct muffler on the heat shield with the bolts and washers.

 (c)  
AIRPLANES WITH THE DUCT ALIGNMENT ASSEMBLY (POST-SB 49-1101); Make sure the brackets on the exhaust duct muffler are the one piece type (approximately one inch height).

 (d)  
AIRPLANES WITH THE DUCT ALIGNMENT ASSEMBLY (POST-SB 49-1101); Install the exhaust duct muffler on the heat shield without the bolts.

 NOTE: The bolts are installed during the aft fairing assembly
____
 installation.

 S 434-005
 (2)  Install the aft fairing assembly (AMM 49-81-31/401).
 TASK 49-81-11-404-013
 5. Exhaust Duct Muffler Installation (With the APU Removed) (Fig. 401)
　
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