Air Filters

Receiving inspection of new air filters (p/n P107336) revealed three out of four had a defective sealing surface, causing the sealing/mating surface to crack and crumble. This defective sealing surface could potentially enter the engine. The defective filters sealing surface has a light-gray color while the replacement filters we received, inspected and found to be in serviceable condition had a dark gray, almost black sealing surface. Suspect that the defective filters had improper material on the sealing surface or were improperly cured.

Key Takeaways:

• Aircraft experienced engine problems, including shutdowns, erratic performance, and ingestion of foreign material, due to various air filter defects such as loose gaskets, defective sealing surfaces, debonded felt seals, and split seams.
• These filter flaws allowed debris or unfiltered air to enter the engine induction systems, posing risks of damage, premature wear, and critical failures.
• The reported issues affected both OEM and non-OEM air filters, with some types exhibiting recurring manufacturing or material quality problems from new to low operational hours.

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