United States Department of Transportation
i
Priority Letter: Cessna Aircraft Company Model 172R Airplanes
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1997-01-01
[PDF-42.45 KB]
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Abstract:This priority letter AD results from an occurrence of fuel loss on a Cessna Model 172R airplane. The fuel loss was severe enough to force an emergency landing. Investigation of the occurrence reveals that the cowling knocked the gascolator drain valve off the gascolator. Further examination of the design of Model 172R airplanes shows that this condition exists when the tailpipe vibrates, during some starting conditions, into the cowling. The cowling then rubs against the gascolator drain valve, knocking the gascolator drain valve off the gascolator, and causing fuel to drain from the airplane at an extremely high flow rate. This results in engine stoppage with consequent forced landing or crash landing.
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