NTSB Identification: LAX87LA098.
The docket is stored on NTSB microfiche number 32190.
Accident occurred Sunday, January 25, 1987 in TRACY, CA
Probable Cause Approval Date: 03/21/1988
Aircraft: GRUMMAN AA-1B, registration: N1408R
Injuries: 1 Minor.

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

JUST AFTER TAKEOFF WHILE CLIMBING THROUGH 200 FT AGL THE ENGINE QUIT. THE PILOT MADE A FORCED LANDING IN A GRAVEL PIT WHERE THE AIRCRAFT COLLIDED WITH A BANK. EXAMINATION OF THE ENGINE REVEALED THAT THE #1 CYLINDER AND PISTON HAD MODERATE TO SEVERE SCUFFING AND THE RINGS WERE OVER LAPPING IN SEVERAL PLACES BY METAL TRANSFER. THE #1 PISTON WAS A NEW PISTON WITH P10 STAMPED ON THE INSIDE TO INDICATE IT WAS A .010 OVERSIZED PISTON. THE REMAINING PISTONS WERE STANDARD SIZE.

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

ENGINE ASSEMBLY,PISTON..INCORRECT


Contributing Factors

TERRAIN CONDITION..LOOSE GRAVEL/SANDY


Contributing Factors

ENGINE ASSEMBLY,CYLINDER..CHAFED


Contributing Factors

TERRAIN CONDITION..DITCH


Contributing Factors

MAINTENANCE,ANNUAL INSPECTION..INADEQUATE..OTHER MAINTENANCE PERSONNEL


Contributing Factors

ENGINE ASSEMBLY,RING..OTHER

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