TASK 49-81-31-404-026
 4. Aft Fairing Assembly Installation (With the APU in Position) (Fig. 401)
_________________________________
 A. Consumable Materials
 (1)  
A00429 Sealant - BMS 5-63

 (2)  
D00237 Compound - Antiseize, MIL-T-5544

 B. References
 (1)  
AMM 26-15-00/501, APU Fire Detection

 (2)  
AMM 49-81-11/401, Exhaust Duct Muffler

 C. Access
 (1)  
Location Zones
 101 Control Cabin, LH
 205 Electronic Compartment
 703 APU Compartment
 704 Tail Cone

 (2)  
Access Panels
 1201 Electronic Equipment Access Door
 3801 Tail Cone Access Door
 3802 Tail Cone Access Door
 3803 APU Exhaust Duct
 3804 APU Cowl Door

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES/MAINTENANCE MANUAL ////////////////////////
D. Procedure

 S 434-028
 (1)  Install the exhaust duct muffler into the heat shield (AMM 49-81-11/401).
 S 424-029
 CAUTION: INSTALL THE AFT FAIRING ASSEMBLY SLOWLY WHILE IT GOES THROUGH
_______ THE AIRPLANE TAIL CONE. MAKE SURE THE FIRE DETECTION ELEMENTS DO NOT HIT THE AIRPLANE STRUCTURE. THE FIRE DETECTION ELEMENTS CAN BE DAMAGED.
 (2)  Install the aft fairing assembly:
 (a)  
Put the aft fairing assembly into the airplane tail cone.

 (b)  
Align the aft fairing assembly with the shroud bellmouth.

 (c)  
Push the aft fairing assembly into its position until the aft fairing is tight against the airplane tail cone.

 (d)  
Install and tighten the screws that attach the aft fairing to the airplane tail cone (Fig. 401).

 (e)  
Attach the drip pan to the heat shield with the bolts and the washers (Fig. 401).

 (f)  
Connect the bonding jumper to the frame member below the forward end of the heat shield.

 (g)  
Install the wiring clamp for each of the two electrical connectors for the fire detection elements.

 (h)  
Connect the two electrical connectors for the fire detection elements.

 NOTE: One electrical connector is for the fire detection
____ element installed on the heat shield. The second electrical connector is for the fire detection element on the exhaust duct muffler (Fig. 401).
 (i)  
AIRPLANES WITH THE DUCT ALIGNMENT ASSEMBLY; Install the duct alignment assembly to the brackets: 1) Apply the antiseize compound to the threads of the bolts. 2) Attach the duct alignment assembly to the brackets with the

 bolts.

 (j)  
AIRPLANES WITH THE DUCT ALIGNMENT ASSEMBLY; Make sure there is a minimum clearance of 0.75 inch between the exhaust duct muffler and the exhaust port of the APU turbine section: 1) If it is necessary, adjust the bolts that attach the duct

 alignment assembly to the brackets until the clearance is correct.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
2)  Tighten the bolts that attach the sliding nuts in the groove of the duct alignment assembly.
 (k)  AIRPLANES WITH THE DUCT ALIGNMENT ASSEMBLY; Install the caps to the drip pan: 1) Apply the sealant to the mating surface of the caps. 2) Attach the caps to the drip pan with the bolts.
 S 414-038
 (3)  
Close both of the access doors on the airplane tail cone.

 S 414-034

 (4)  
Close the APU cowl door:

 (a)  
Disconnect the door support rods.

 (b)  
Put the door support rods in the clips on the APU cowl door.

 (c)  
Close the APU cowl door.

 (d)  
Close the latches for the APU cowl door.
　
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