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NTSB Report
October 13, 1990 · Mooney M20F · N9732M
Casper, WY
Overview
Report Status
Probable Cause
Event Type
Accident
Date
October 13, 1990
Injury Outcomes
No injuries (3 uninjured)
Location
Casper, WY
Aircraft
Mooney M20F
Tail Number
N9732M
Operator
Glenn a Watts
Injuries
None
Aircraft Damage
Substantial
NTSB Number
SEA91LA006
THE PILOT MADE A FORCED LANDING AFTER THE ENGINE FAILED. INVESTIGATION REVEALED THE NUMBER 2 CYLINDER CONNECTING ROD LOWER YOKE WAS FRACTURED. METALLURGICAL EXAMINATION OF THE ROD REVEALED ROTATIONAL POLISHING AND GALLED SPOTS ON THE INSIDE YOKE SURFACES AND A FATIGUE FRACTURE OF THE YOKE THAT ORIGINATED AT THE INSIDE SURFACE.
NTSB Probable Cause
THE LOSS OF ENGINE POWER DUE TO FATIGUE FRACTURE OF THE NUMBER 2 CYLINDER CONNECTING ROD. FACTORS RELATED TO THE ACCIDENT WERE: ROUGH AND UNEVEN TERRAIN AT THE ACCIDENT SITE AND THE LACK OF SUITABLE TERRAIN FOR FORCED LANDING.
Full Narrative
THE PILOT MADE A FORCED LANDING AFTER THE ENGINE FAILED. INVESTIGATION REVEALED THE NUMBER 2 CYLINDER CONNECTING ROD LOWER YOKE WAS FRACTURED. METALLURGICAL EXAMINATION OF THE ROD REVEALED ROTATIONAL POLISHING AND GALLED SPOTS ON THE INSIDE YOKE SURFACES AND A FATIGUE FRACTURE OF THE YOKE THAT ORIGINATED AT THE INSIDE SURFACE.
Flight
Event TypeAccident
Event Time11:10 MDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftMooney M20F
Tail NumberN9732M
Aircraft CategoryAir
DamageSubstantial
OperatorGlenn a Watts
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · IO-360 · Reciprocating · 200
Seats4
People & Injuries
Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1Age 51 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind310° @ 20 kt, gusting 26 kt
Visibility50 sm
CeilingBroken clouds 25000 ft
Temperature / Dew Point54 / 0 C
Altimeter29.00 inHg
Observation Time18:50
Weather SourceWFAC