EXHAUST DUCT MUFFLER - CLEANING/PAINTING
1. Exhaust Duct Muffler Cleaning
A. Equipment and Materials
(1)
One gallon acetone
(2)
Caustic alkali cleaning solution - heavy-duty steam cleaning compound. Mix one part of caustic compound with 35 parts water.
(3)
Bristle brush
(4)
Detergent solution. Any commercially available detergent can be used. Mix in ratio of 1-1/2 pounds to 35 gallons of water.
B. Clean Exhaust Muffler
(1)
Remove exhaust duct muffler. Refer to 49-81-11.
(2)
Flush unit with approximately 1 gallon of acetone and air dry.
(3)
Heat caustic alkali cleaning solution to 175°F and immerse muffler in solution. Leave muffler in solution for 5 minutes.
(4)
Agitate solution to wash muffler interior thoroughly, and lightly brush all over with bristle brush.
(5)
Remove muffler from cleaning solution and immerse in detergent solution heated to 175°
F.
(6)
Agitate detergent solution and brush with bristle brush.
(7)
Remove muffler from detergent solution and stand it on one side to drain.
(8)
After draining, place muffler in a hot air environment at 150°F for 5 hours.
(9)
Remove muffler from hot air environment and cool to room temperature.
(10)
Install muffler on airplane. Refer to 49-81-11.
500
Nov 15/69 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 49-81-11 Page 701
EXHAUST DUCT HEAT SHIELD - REMOVAL/INSTALLATION
1. General
A. The exhaust duct heat shield is an integral part of the aft fairing assembly and cannot be replaced as a line maintenance item. If the exhaust duct heat shield is to be replaced, the aft fairing and exhaust duct heat shield must be replaced as an assembly (Ref 49-81-31, Removal/Installation).
501
May 15/80 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 49-81-21 Page 401
AFT FAIRING - REMOVAL/INSTALLATION
1. General
A. The aft fairing is an integral part of the aft fairing assembly. Therefore, the removal of the aft fairing consists of removing the complete aft fairing assembly. The aft fairing assembly consists of the aft fairing, the exhaust duct heat shield, and the exhaust duct muffler. If the muffler is to be removed, the aft fairing assembly must be removed from the airplane.
2. Equipment and Materials
A. APU Heat Shield Installation/Removal Equipment - F80207-1; composed of the following:
(1)
Pusher Plate Assembly -F80207-8
(2)
Spring Clip - F80207-36 (4 necessary)
(3)
Flange Assembly - F80207-13 (2 necessary)
(4)
Flange Retainer Assembly - F80207-12 (2 necessary)
(5)
Reaction Plate Assembly -F80207-2
(6)
Push Rod Assembly - F80207-5
(7)
Threaded Stud - F80207-46 (10 necessary)
(8)
Lock Nut - F80207-47 (10 necessary)
(9)
Puller Plate Assembly -F80207-6
(10)
Rod Extension Assembly -F80207-10
(11)
Pressure Pad Assembly - F80207-9
(12)
Take-Up-Rod - F80207-11
(13)
Pressure Pad Assembly Ball Lockpin -F80207-38
B. AIRPLANES WITH THE DUCT ALIGNMENT ASSEMBLY;
Antiseize Compound -EASE-OFF 990 or Fel-Pro C-200 (AMM 20-30-21/201)
C. AIRPLANES WITH THE DUCT ALIGNMENT ASSEMBLY;
Sealant - MIL-S-38249 (AMM 20-30-11/201).
3. Prepare for Removal
A. Position BATTERY SWITCH to OFF, and placard that APU is “in work.”
B. Remove access panel 3802.
4. Remove Aft Fairing Assembly (Fig. 401)
A. Remove the APU (AMM 49-11-0/401).
B. Disconnect the electrical connectors from the fire detection elements of the heat shield and the exhaust duct muffler prior to removal of the aft fairing.
CAUTION: CARE MUST BE TAKEN SO THAT THE FIRE DETECTION ELEMENT WHICH IS ATTACHED TO THE HEAT SHIELD WILL NOT BE DAMAGED.
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.
524
Oct 20/93 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 49-81-31 Page 401
C82046 C82096 C81916
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