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Aviation safety reports, made easier to study

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NTSB Report

September 21, 1992 · Mooney M20K · N99693

Weston, WV

Overview

Report Status
Probable Cause
Event Type
Accident
Date
September 21, 1992
Injury Outcomes
2 injuries (2 fatalities)
Location
Weston, WV
Aircraft
Mooney M20K
Tail Number
N99693
Operator
T and S Rentals
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
BFO92FA152

After being alerted to an oil streak along the side of the airplane, the pilot checked the oil and then departed on a night flight over hilly terrain. While in cruise flight, the pilot reported 'motor troubles' to approach control and received vectors to the closest airport. This airport had no runway lighting. The pilot was able to maintain partial power for about 14 minutes. During this time, the ATC controller was unsuccessful in attempts to turn on the runway lights at the closest airport, and was unaware the lights were out of service. The pilot then reported 'it's dead' as he approached the airport. He was unable to land at the unlit airport, despite guidance from ATC and another airplane which was in the vicinity. The airplane impacted terrain and was destroyed. An exam of the engine revealed the No. 1 cylinder had separated from the engine crankcase in flight. A metallurgical exam revealed evidence of fretting damage on the attachment flange and fatigue failure of the attaching through bolts and hold down studs.

NTSB Probable Cause

TOTAL LOSS OF ENGINE POWER DUE TO THE INADEQUATE TORQUE OF THE NO. 1 CYLINDER ATTACH BOLTS AND STUDS, FATIQUE FAILURE OF THE BOLTS/STUDS, AND SEPARATION OF THE NO. 1 CYLINDER. FACTORS RELATED TO THE ACCIDENT WERE: DARKNESS AND HILLY TERRAIN, WHICH WERE UNSUITABLE FOR A FORCED LANDING.

Full Narrative

AFTER BEING ALERTED TO AN OIL STREAK ALONG THE SIDE OF THE AIRPLANE, THE PILOT CHECKED THE OIL AND THEN DEPARTED ON A NIGHT FLIGHT OVER HILLY TERRAIN. WHILE IN CRUISE FLIGHT, THE PILOT REPORTED 'MOTOR TROUBLES' TO APPROACH CONTROL AND RECEIVED VECTORS TO THE CLOSEST AIRPORT. THIS AIRPORT HAD NO RUNWAY LIGHTING. THE PILOT WAS ABLE TO MAINTAIN PARTIAL POWER FOR ABOUT 14 MINUTES. DURING THIS TIME, THE ATC CONTROLER WAS UNSUCCESSFUL IN ATTEMPTS TO TURN ON THE RUNWAY LIGHTS AT THE CLOSEST AIRPORT, AND WAS UNAWARE THE LIGHTS WERE OUT OF SERVICE. THE PILOT THEN REPORTED 'ITS DEAD' AS HE APPROACHED THE AIRPORT. HE WAS UNABLE TO LAND AT THE UNLIT AIRPORT, DESPITE GUIDANCE FROM ATC AND ANOTHER AIRPLANE WHICH WAS IN THE VICINITY. THE AIRPLANE IMPACTED TERRAIN AND WAS DESTROYED. AN EXAM OF THE ENGINE REVEALED THE NO. 1 CYLINDER HAD SEPARATED FROM THE ENGINE CRANKCASE IN FLIGHT. A METALLURGICAL EXAM REVEALED EVIDENCE OF FRETTING DAMAGE ON THE ATTACHMENT FLANGE AND FATIGUE FAILURE OF THE ATTACHING THROUGH BOLTS AND HOLD DOWN STUDS.

Flight

Event TypeAccident
Event Time20:01 EDT
Nearest AirportLouis Bennett Field (1nm E)
Runway0
Runway Length3195 ft
Runway Width50 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo

Aircraft

AircraftMooney M20K
Tail NumberN99693
Aircraft CategoryAir
DamageDestroyed
OperatorT and S Rentals
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · TSIO-360-GB3 · Reciprocating · 180
Seats4

People & Injuries

Injury Summary2 injuries (2 fatalities)
Fatal2
Serious0
Minor0
Uninjured0
Total2
Crew 1Age 64 · Second Class

Conditions

ConditionsVMC
LightDark Night
WindCalm
Visibility12 sm
CeilingBroken clouds 20000 ft
Temperature / Dew Point66 F
Altimeter30.00 inHg
Observation Time23:45
Weather SourceWFAC

Appendix: Source Data