Squawk Box

June 2008 Issue

Cracking Up - NTSB Reports

The following information is derived from the FAA’s Service Difficulty Reports and Aviation Maintenance Alerts.

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 cell’s 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.

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