Accident Boeing-Stearman A75N1 N56924, Tuesday 19 January 1993

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Date:	Tuesday 19 January 1993
Time:	19:10 LT
Type:	Boeing-Stearman A75N1
Owner/operator:	Private
Registration:	N56924
MSN:	75-2480
Total airframe hrs:	6601 hours
Engine model:	P&W R-985-AN1
Fatalities:	Fatalities: 0 / Occupants: 1
Other fatalities:	0
Aircraft damage:	Substantial
Category:	Accident
Location:	Medicine Bow, WY - United States of America
Phase:	En route
Nature:	Private
Departure airport:	Rock Springs, WY (RKS
Destination airport:	Laramie, WY (KLAR)
Investigating agency:	NTSB
Confidence Rating:	Accident investigation report completed and information captured

Narrative:
THE PILOT REPORTED THAT SHORTLY AFTER LEVELLING OFF AT 14,000 FEET MSL, THE ENGINE SURGED THREE TIMES AND THEN STOPPED. A FORCED LANDING WAS EXECUTED ONTO ROCKY, UPSLOPING TERRAIN, UNDER DARK NIGHT CONDITIONS. SUBSEQUENT DISASSEMBLY OF THE ENGINE REVEALED THAT THE NUMBER 7 CYLINDER INTAKE VALVE ROCKER ARM HAD FAILED.

Probable Cause: FAILURE OF THE #7 CYLINDER ROCKER ARM. FACTORS CONTRIBUTING TO THE ACCIDENT WERE UNSUITABLE TERRAIN AND DARK NIGHT CONDITIONS.

Accident investigation: