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NTSB Report
January 20, 1993 · Boeing A75N1 · N56924
Medicine Bow, WY
Overview
Report Status
Probable Cause
Event Type
Accident
Date
January 20, 1993
Injury Outcomes
1 injury (1 minor injury)
Location
Medicine Bow, WY
Aircraft
Boeing A75N1
Tail Number
N56924
Operator
Denton Larry E
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
SEA93LA055
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.
NTSB Probable Cause
FAILURE OF THE #7 CYLINDER ROCKER ARM. FACTORS CONTRIBUTING TO THE ACCIDENT WERE UNSUITABLE TERRAIN AND DARK NIGHT CONDITIONS.
Full 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.
Flight
Event TypeAccident
Event Time18:10 MST
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBoeing A75N1
Tail NumberN56924
Aircraft CategoryAir
DamageSubstantial
OperatorDenton Larry E
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsP&W · R-985-AN1 · Reciprocating · 450
Seats2
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 57 · Second Class
Conditions
ConditionsUnknown
LightDark Night
Wind250° @ 14 kt
Visibility7 sm
CeilingOvercast 1500 ft
Temperature / Dew Point25 C / 21 C
Altimeter29.00 inHg
Observation Time00:50
Weather SourceWFAC