FTW91FA109

NTSB accident investigation · North American NA1 · Mountain Home, AR · June 28, 1991

Accident · Serious injuriesField investigationFinal report
Date
June 28, 1991, 10:50 local (15:50 UTC)
Place
Mountain Home, AR
Injuries
3 serious
Damage
Destroyed
Phase of flight
Initial climb
Aircraft
N91108North American NA1
Weather
Visual (VMC) · Day
Status
Completed · report March 24, 1993
Report
Approved by Office Director
FAA report
19910628024869A
Case key
23268

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

The contamination of the airplane's fuel system and the foreign object blockage of the vapor return orifice which induced the power loss. A factor was the lack of suitable terrain.

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) - nonmechanicalTakeoff - initial climb
Fuel system,vapor return system - blocked(total)Cause
Fuel system,vapor return system - foreign objectCause
Ignition system,magneto - failure,partial
Fuel system - contaminationCause
Forced landingDescent - emergency
In flight collision with objectDescent - emergency
Object - tree(s)
Terrain condition - none suitableFactor

Analysis

The pilot experienced a power loss shortly after takeoff and subsequently executed a forced landing in trees. There were no other suitable forced landing areas. The occupants could not open the sliding canopy and had to exit through the windshield. The aircraft was then destroyed by a post crash fire. Neither the pilot nor the passengers could say whether or not the engine had completely quit. Investigation revealed contamination in the form of grit and lint throughout the fuel delivery system. In addition, it was determined that the foreign material had blocked the vapor return orifice in the carburetor. The source of the contamination was not determined; however, it was not generic to the carburetor or fuel system. It was also determined that the airplane was being operated with excessive magneto drop on both magnetos.

Aircraft

Registration
N91108
Reported as
North American NA1
Category
Airplane
Serial number
NAV4-11
Airframe hours
1,823
Engine
Continental E-225, 225 horsepower, reciprocating
Damage
Destroyed
Fire
On-Ground
Flight
Personal · Part 91
Operator
Diane H. Mullins
Registered owner
Diane H. Mullins
Airworthiness certificate
Standard, Normal
Last inspection
Annual · May 1, 1991 · 40 hours before
Destination
HSV · Huntsville, AL
Flight plan
VFR
Airport
2M9 · Baxter County, runway 23, 4,510 × 75 ft, asphalt

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
37
Certificates
Commercial, Flight instructor
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
1,216 total · 70 in this make and model · 1,166 as pilot in command · 150 in the last 90 days · 50 in the last 30 days · 8 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
150° at 10 knots
Visibility
11 statute miles
Lowest ceiling
None
Temperature
79 °F, dew point 68 °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.