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NTSB Report
November 17, 1990 · Mooney M20E · N5703Q
Tuba City, AZ
Overview
Report Status
Probable Cause
Event Type
Accident
Date
November 17, 1990
Injury Outcomes
2 injuries (2 minor injuries)
Location
Tuba City, AZ
Aircraft
Mooney M20E
Tail Number
N5703Q
Operator
Story David L
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
LAX91LA033
THE PLT HAD REPEATEDLY EXPERIENCED A ROUGH RUNNING ENG DURING HIS CROSS-COUNTRY FLT FROM SANTE FE. HE HAD ALSO OBSERVED HIGH ENG AND OIL TEMPS. HE MADE A PRECAUTIONARY LANDING AND REQUESTED THAT A MECHANIC REPAIR THE ENG. HE THEN TOOK OFF AND CONTINUED HIS PLANNED FLIGHT. ONCE AGAIN THE ENG RAN ROUGH, AND HE MADE ANOTHER PRECAUTIONARY LANDING. HE EXAMINED THE AIRPLANE AND ADDED FIVE QUARTS OF OIL TO THE ENG. DURING THE TAKEOFF ROLL THE ENG AGAIN RAN ROUGH. THE AIRPLANE OVERRAN THE END OF THE 2,000 FT DIRT RUNWAY AND COLLIDED WITH TERRAIN. EXAMINATION OF THE ENG REVEALED BROKEN RINGS IN TWO PISTONS, AND ALL OTHER PISTON RINGS HAD LOST THEIR TEMPER. DENSITY ALTITUDE ESTIMATED 6.700 FT.
NTSB Probable Cause
FAILURE OF THE PISTON RINGS WHICH REDUCED THE AVAILABLE ENGINE POWER, AND THE PILOT'S CONTINUED OPERATION OF HIS AIRPLANE WITH A KNOWN ENGINE DEFICIENCY DURING THE RELATIVELY HIGH DENSITY ALTITUDE CONDITIONS.
Full Narrative
THE PLT HAD REPEATEDLY EXPERIENCED A ROUGH RUNNING ENG DURING HIS CROSS-COUNTRY FLT FROM SANTE FE. HE HAD ALSO OBSERVED HIGH ENG AND OIL TEMPS. HE MADE A PRECAUTIONARY LANDING AND REQUESTED THAT A MECHANIC REPAIR THE ENG. HE THEN TOOK OFF AND CONTINUED HIS PLANNED FLIGHT. ONCE AGAIN THE ENG RAN ROUGH, AND HE MADE ANOTHER PRECAUTIONARY LANDING. HE EXAMINED THE AIRPLANE AND ADDED FIVE QUARTS OF OIL TO THE ENG. DURING THE TAKEOFF ROLL THE ENG AGAIN RAN ROUGH. THE AIRPLANE OVERRAN THE END OF THE 2,000 FT DIRT RUNWAY AND COLLIDED WITH TERRAIN. EXAMINATION OF THE ENG REVEALED BROKEN RINGS IN TWO PISTONS, AND ALL OTHER PISTON RINGS HAD LOST THEIR TEMPER. DENSITY ALTITUDE ESTIMATED 6.700 FT.
Flight
Event TypeAccident
Event Time11:50 MST
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftMooney M20E
Tail NumberN5703Q
Aircraft CategoryAir
DamageSubstantial
OperatorStory David L
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · IO-360-A1A · Reciprocating · 200
Seats4
People & Injuries
Injury Summary2 injuries (2 minor injuries)
Fatal0
Serious0
Minor2
Uninjured0
Total2
Crew 1Age 44 · Third Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility20 sm
CeilingNone
Temperature / Dew Point70 F / 0 C
Altimeter30.00 inHg
Weather SourcePILO