Squawk Box

August 2002 Issue

O No

Defective batch of O rings swells up when in contact with avgas

The following information is derived from the FAAs Service Difficulty Reports and Aviation Maintenance Alerts.

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The FAA has issued a safety recommendation regarding a batch of O rings manufactured by Parker and distributed by Valtec because the rings may swell excessively when coming into contact with avgas. The problem first came to light after the fuel selector valve on a Cessna 180 was rebuilt and the engine then suffered fuel starvation. The O ring had enlarged to twice its original size. The O rings in question bear a part number of MS29513-112, a package date of 06/01 and a lot number of 60002401. The manufacturer concluded that the lot was made from the wrong materi...

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