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 are prone to various failures, including leaks, internal separations, blocked baffling, failed spot welds, and deteriorated joints.
• Many of these defects are difficult to detect visually or can be missed during routine inspections, yet can lead to serious safety issues such as carbon monoxide exposure.
• These exhaust system failures are reported across diverse aircraft models and can occur at various operating times, including relatively low part hours.

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