Cracking Up - NTSB Reports

Prior to installing an overhauled fuel cell, it was found to contain a large quantity of sawdust-like particles. Further inspection revealed the foam filling the fuel reservoir was breaking down. The older cells reservoir foam insert was compatible with 100/130 fuel. However, 100LL causes the foam to break down into fine particles that get trapped in filters and screens. This problem is addressed in service bulletin (SB) number 2109 which replaces the old style foam (p/n 369200157) with a product that is suitable for use with 100LL.

Editorial Staff

Tuesday, May 20, 2008 at 12:00 AM ET

Verified

Key Takeaways:

Beech B55 Barons are experiencing fuel cell foam disintegration due to incompatibility with 100LL fuel, leading to particle contamination and requiring replacement as per SB 2109.
Engine reliability concerns include cracked cylinders in Superior Continental IO-520-F engines and a jammed mixture control shaft in a Continental IO-240-B17B fuel pump.
Cessna 150/152 aircraft have a recurring problem with cracked, broken, or corroded aft fin attach fittings, especially on those used for training and aerobatics, warranting continued inspection.