NTSB Identification: BFO89LA053.
The docket is stored on NTSB microfiche number 40563.
Accident occurred Saturday, July 01, 1989 in OCEAN CITY, MD
Probable Cause Approval Date: 09/30/1991
Aircraft: CHAMPION 7GCBC, registration: N7521F
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE PLT REPORTED THAT HE WAS FLYING OVER WATER ALONG THE BEACHFRONT AT 200 FT MSL, WITH THE ENGINE SET AT 2250 RPM. HE HEARD A FAINT SOUND FROM THE ENGINE AND SENSED THAT THE MUFFLER WAS SEPARATING. HE UNSUCCESSFULLY TRIED TO CLIMB. THE ENGINE ONLY DEVELOPED 2200 RPM AT FULL THROTTLE. HE DROPPED THE BANNER AND SOON AFTERWARD THE ENGINE LOST POWER. THE PLT STATED THAT A BURNING SMELL FILLED THE CABIN; HOWEVER, HE DID NOT SEE ANY SMOKE. HE DITCHED THE ACFT AND USED A LIFE PRESERVER TO FLOAT ASHORE. EXAMINATION OF THE ACFT REVEALED MATERIAL FAILURE OF THE EXHAUST PIPE AT THE NUMBERS THREE AND FOUR CYLINDER EXHAUST STACK JOINT, WHERE IT CONNECTS TO THE MUFFLER. ALSO NOTED WAS SOOT AND SMOKE DISCOLORATION INSIDE THE CARBURETOR INLET CHAMBER.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

LOSS OF ENGINE POWER FROM EXHAUST GAS LEAKAGE INTO THE CARBURETOR INLET, CAUSING ENGINE AIR STARVATION, AND MATERIAL FAILURE OF THE EXHAUST MANIFOLD. .

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