Mufflers

While carrying out Canadian AD CF90-03-R2, large leaks were found in the area surrounding the muffler tail pipe area under the structure for supporting the heat muff shroud. No defects were noticed in a visual inspection of this area. No data tag was on the muffler, so its assumed it is an original unit. The operators logs dont show it ever being changed.

Key Takeaways:

• Aircraft exhaust systems, including mufflers and their connecting components, are susceptible to various failures such as leaks, failed welds, internal separations, and blockages.
• These defects can lead to serious safety concerns, including carbon monoxide exposure and obstructed exhaust flow.
• Visual inspections often prove insufficient to detect these issues, as many defects are internal, located in hard-to-access areas, or can be missed during routine maintenance checks.

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