LAX91LA033

NTSB accident investigation · Mooney M20E · Tuba City, AZ · November 17, 1990

Accident · Minor injuriesLimited investigationFinal report
Date
November 17, 1990, 11:50 local (18:50 UTC)
Place
Tuba City, AZ
Injuries
2 minor
Damage
Substantial damage
Phase of flight
Takeoff
Aircraft
N5703QMooney M20E
Weather
Visual (VMC) · Day
Status
Completed · report December 14, 1992
Report
Approved by Office Director
FAA report
19901117051049A
Case key
27062

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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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.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

Loss of engine power(partial) - mech failure/malfTakeoff - roll/run
Engine assembly,ring - failure,totalCause
Engine assembly,cylinder - low compressionCause
Operation with known deficiencies in equipment - continuedPilot in commandCause
OverrunTakeoff - aborted
Weather condition - high density altitudeFactor
On ground/water encounter with terrain/waterTakeoff - aborted

Analysis

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.

Aircraft

Registration
N5703Q
Reported as
Mooney M20E
Category
Airplane
Serial number
711
Airframe hours
3,689
Engine
Lycoming IO-360-A1A, 200 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Story, David L.
Last inspection
Annual · January 5, 1990 · 210 hours before
Destination
GCN · Grand Canyon, AZ

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
44
Certificate
Private
Airplane ratings
Multi-engine land, Single-engine land
Instrument ratings
Airplane
Medical
Class 3, Valid Medical--no waivers/lim.
Flight hours
556 total · 69 in this make and model · 480 as pilot in command · 86 in the last 90 days · 44 in the last 30 days · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
20 statute miles
Lowest ceiling
None
Temperature
70 °F, dew point -0 °F
Altimeter
30.00 inHg

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.