Squawk Box

January 2003 Issue

Lousy Seals

Some vacuum pumps may contain cork gaskets that aren’t suited to the application

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


The FAA reports it has information that some of the Airborne vacuum pumps and possibly pump drive coupling kits provided by Parker Hannifin and produced under a parts manufacture approval may have incorporated a cork gasket that is not compatible with some pump installations on certain engine installations. Cessna has issued a specific service newsletter that applies to the installation of the incorrect vacuum pump cork gasket. However, the suspect cork gasket may have been installed on other makes and models of aircraft when either the vacuum pump and/or the pump...

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