What it covers
For general reports of muffler system defects. The component used on reciprocating engines to reduce engine exhaust noise. Does not include the shroud over the muffler used to collect heated fresh air for cabin and carburetor heat filed in JASC code 2140. Includes the clover leaf shaped unit mounted on turbo-jet engine exhaust tailpipes for sound suppression. Typical parts are baffle, and flame tube, etc.
Service difficulty reports · 248
Reports filed under 7820, newest first.
| 1995 | 10 |
|---|---|
| 1996 | 11 |
| 1997 | 11 |
| 1998 | 19 |
| 1999 | 14 |
| 2000 | 13 |
| 2001 | 9 |
| 2002 | 11 |
| 2003 | 9 |
| 2004 | 5 |
| 2005 | 15 |
| 2006 | 7 |
| 2007 | 9 |
| 2008 | 13 |
| 2009 | 4 |
| 2010 | 13 |
| 2011 | 11 |
| 2012 | 4 |
| 2013 | 6 |
| 2014 | 10 |
| 2015 | 13 |
| 2016 | 6 |
| 2017 | 2 |
| 2018 | 2 |
| 2020 | 13 |
| 2023 | 2 |
| 2024 | 4 |
| 2025 | 1 |
| 2026 | 1 |
SDR HNAA2026070200564Clamp · looseEXHAUST FUMES STRONGLY SMELLED IN COCKPIT DUIRNG APU AND PACKS RUNNING AFTER LANDING. FOUND MUFFLER CLAMPS LOOSE IN APU AREA ON INTAKE AND EXHAUST TUBES, SECURED CLAMPS AS REQUIRED. RAN APU AND BOTH PACKS, OPS CHECK GOOD. SUSPECT ODOR COMING FROM HEPA FILTSDR 2025FA0000671Muffler · out of positionMUFFLER FLANGE GOING TO NR 4 CYLINDER EXHAUST PIPE DOES NOT MATE ALL THE WAY DUE TO INTERFERENCE OF TUBES GOING TO THE AIR INTAKE BOX. THIS CAUSES AN EXHAUST LEAK THAT CAN LEAD TO DAMAGE OF AIR INTAKE TUBE.SDR 2024FA0000773Muffler · crackedL/H ENGINE RUNNING ROUGH AT HIGHER POWER SETTINGS. EGT WAS 300-400 DEGREES HIGHER THAN NORMAL. L/H ENGINE RUNNING ROUGH AT HIGHER POWER SETTINGS. EGT WAS 300-400 DEGREES HIGHER THAN NORMAL."- FOUND FORWARD AND AFT EXHAUST MUFFLER BAFFLES CRACKED AND CREATING
See all 248 reports