Accident Grumman AA-1B N1408R, Sunday 25 January 1987

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Date:	Sunday 25 January 1987
Time:	17:04 LT
Type:	Grumman AA-1B
Owner/operator:	Private
Registration:	N1408R
MSN:	G14711
Total airframe hrs:	1800 hours
Engine model:	Lycoming O-235-C2C
Fatalities:	Fatalities: 0 / Occupants: 1
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Tracy, CA - United States of America
Phase:	Initial climb
Nature:	Private
Departure airport:	Tracy, CA (104)
Destination airport:	Livermore, CA (KLVK)
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
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.

Probable Cause:

Accident investigation: