Service difficulty report · Muffler · Beech 76

Difficulty date
September 8, 2010
Submitted
October 1, 2010
Operation
General aviation
Aircraft
N6011U
Make and model
Beech 76
Aircraft serial
ME101
Engine
Lyc O360A1G6D
Part
Muffler
Part number
8295100
Part serial
ABC141492
Condition
Unserviceable
Location
Engine Exhaust
Stage of operation
IN
How discovered
9
Nature of condition
O
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

BAFFLE PLATE IN LT MUFFLER APPEARED TO BE OUT OF POSITION WHEN INSPECTED BY SHINING A FLASHLIGHT UP THE TAILPIPE. ON REMOVAL, IT WAS FOUND THAT THE BAFFLE PLATE WAS CRACKED AND WARPING IN A MANNER THAT COULD HAVE CREATED A SIGNIFICANT BLOCKAGE IN THE FLOW OF GASES FROM THE MUFFLER. BY DESIGN, THE BAFFLE PLATE IN THIS MUFFLER (NOT A HEATER/MUFFLER) DOESN`T SEEM TO PERFORM ANY WORTHWHILE FUNCTION AS DOES THE FLAME-TUBES FOUND IN OTHER MUFFLER DESIGNS. IT COULD HOWEVER, PRESENT A SIGNIFICANT HAZARD WHEN CRACKED, WARPED INSIDE THE MUFFLER. RECOMMEND REMOVING THE BAFFLE PLATE IN THIS TYPE OF MUFFLER.

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