1)  A crack shorter than 2 inches is permitted on the exhaust duct muffler (shorter than 3 inches is permitted on the tube and liner assemblies).
 2)  The minimum spacing between the cracks must be more than two times the length of the crack. 3) The total length of all the cracks for one part must be less than 10 inches. 4) Cracks not longer than 1/2 inch are permitted from the rivet hole. 5) Cracks on adjacent rivet holes, on the edge of a part or on the bracket assemblies are not permitted.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 ////////////////////////
(c)  
Examine the external surfaces of the exhaust duct muffler for missing rivets. 1) Make sure there are at least three rivets installed in a

 row between the missing rivets. 2) Make sure all rivets are installed on the bracket assemblies.

 (d)  
Examine the internal surfaces of the exhaust duct muffler for missing rivets and holes on the felt metal liner. 1) One missing rivet is permitted for each row. 2) APUs WITHOUT THE FULL-LENGTH FELT METAL LINER;

 Holes less than 0.20 inch (5.1 mm) in diameter are permitted on the felt metal liner.
 NOTE: Holes more than 0.20 inch (5.1 mm) in diameter can
____ be repaired (OHM 49-13-01) if the adjacent surface material is not brittle (oxidized). If the adjacent surface material is oxidized and the holes are less than 0.50 inch (12.7 mm) in diameter, you must inspect the felt metal liner every 100 APU hours. You must replace the felt metal liner if the holes are more than 0.50 inch (12.7 mm) in diameter.
 3)  APUs WITH THE FULL-LENGTH FELT METAL LINER; Holes less than 0.20 inch (5.1 mm) in diameter are permitted on the felt metal liner.
 NOTE: You must repair the felt metal liner with a welded
____ patch or replace the felt metal liner if the holes are more than 0.20 inch (5.1 mm) in diameter.
 (e)  If the visual inspection is not in the limits, replace the exhaust duct muffler (AMM 49-81-11/401).
 S 426-007
 (3)  Install the exhaust duct muffler (AMM 49-81-11/401).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
EXHAUST DUCT MUFFLER - CLEANING/PAINTING
________________________________________
 1.  General_______
 A.  This procedure gives the task to clean the exhaust duct muffler. To
 clean the exhaust duct muffler, it must be removed from the airplane.

 TASK 49-81-11-107-001
 2.  Exhaust Duct Muffler Cleaning_____________________________
 A.  Standard Tools and Equipment
 (1)  Air Source - Compressed Dry
 B.  Consumable Materials
 (1)  
G00500 Brush - Stiff Bristle

 (2)  
B00715 Solvent - Methyl Ethyl Ketone, TT-M-261

 (3)  
B00666 Solvent - Methyl Propyl Ketone (this is an alternative to Methyl Ethyl Ketone)

 (4)  
B00022 Alkaline - Heavy Duty, Solution of 1 part cleaner to 35 parts water

 (5)  
B00116 Detergent, Solution of 1 1/2 pounds of detergent to 35 gallons of water

 C.  References
 (1)  AMM 49-81-11/401, Exhaust Duct Muffler
 D.  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

 E.  Procedure
 S 027-002
 (1)  
Remove the exhaust duct muffler (AMM 49-81-11/401).

 (2)  
Clean the exhaust duct muffler:

 S 117-003
 WARNING: DO NOT GET THE SOLVENT IN YOUR MOUTH, OR YOUR EYES, OR ON
_______ YOUR SKIN. DO NOT BREATHE THE FUMES FROM THE SOLVENT. PUT ON A PROTECTIVE SPLASH GOGGLE AND GLOVE WHEN YOU USE THE SOLVENT. KEEP THE SOLVENT AWAY FROM SPARKS, FLAME, AND HEAT. THE SOLVENT IS A POISONOUS AND FLAMMABLE MATERIAL WHICH CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
　
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