exhaust inspection on a 0-320 150hp

[eslboat]

Does anyone know if there is an exhaust out there for the 0-320 that doesn't need inspection every 25 hours? Any suggestions on the best exhaust system to go with on a PA-12 with a 0-320 A2B would be very much appreciated . Thanks

 

[Steve Pierce]

They don't have to be inspected every 25 hours. Here is part of the text from the AD.

(a) For all airplanes except Models J3, J4, J5, PA-11 and those referenced in paragraphs (i) and (j), which have exhaust mufflers with 950 or more hours time in service on the effective date of this AD, comply with paragraph (e) within the next 50 hours time in service and thereafter at intervals not to exceed 50 hours time in service from the last inspection.

(b) For all airplanes except Models J3, J4, J5, PA-11 and those referenced in paragraphs (i) and (j), which have exhaust mufflers with less than 950 hours time in service on the effective date of this AD, comply with paragraph (e) within the next 50 hours time in service, and thereafter at intervals not to exceed 100 hours time in service from the last inspection. After the exhaust muffler has accumulated 950 hours time in service, comply with the inspection requirements of paragraph (a).

(f) Remove muffler assembly, disconnect air ducts, stacks, and shrouds as necessary, and visually inspect exterior and interior surfaces with a probe light and mirror for signs of cracks, corrosion, burn-throughs, heat damage, collapsed stack, or weld separations. For carburetor type engines, special attention should be given to the exhaust stack under the carburetor heat shroud. Except during the initial inspection, the muffler need not be removed from the airplane, provided visual inspection with probe light and mirror is made through the muffler tail pipe outlet and one end of the muffler at the stack connection.

 

[bob turner]

We just had one fail! The inner tube had busted on both sides, allowing it to rattle around inside the muffler. That was after an annual about 20 hours prior. Atlee Dodge muffler saved the day!

 

[OldCuby]

Bob,
Do you mean that the failed muffler was an Atlee Dodge and thus prevented a worst failure? Or you replaced the failed muffler with an Atlee Dodge?

I've got a 1000hr muffler and thinking of just replacing it with one that if a faliure does occur, it will not force a landing.

Jim