ANC06LA130

NTSB accident investigation · McNabb Bushmaster · Delta Junction, AK · September 4, 2006

Accident · Minor injuriesLimited investigationFinal report
Date
September 3, 2006, 21:00 local (Sep 4, 2006, 05:00 UTC)
Place
Delta Junction, AK
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Approach
Aircraft
N5090FMcNabb Bushmaster
Weather
Visual (VMC) · Dusk
Status
Completed · report May 29, 2007
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Parties
FAA-AL-FAI FSDO 01
Case key
64465

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

An electrical short that disabled the electronic ignition system of the airplane's engine during the final approach phase for landing, which resulted in a forced landing and collision with high vegetation. A factor contributing to the accident was the failure of the pilot to maintain proper altitude in the landing pattern to reach the runway during the forced landing.

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 powerApproach - vfr pattern - final approach
Ignition system - shortedCause
Forced landingEmergency descent/landing
In flight collision with terrain/waterEmergency descent/landing
Terrain condition - high vegetation
Proper altitude - not maintainedPilot in commandFactor

Analysis

The commercial certificated pilot was accumulating flight hours on an experimental airplane for the builder, as part of a Title 14, CFR Part 91 flight test period to comply with the experimental type certificate. The airplane's engine was an automotive, Ford 3.8L, V-6. It was equipped with an electronic ignition system. After 1.25 hours of flight time, the pilot was on final approach for landing, and when he turned on the airplane's landing light, the engine lost power. He was unable to restart the engine and descended into high vegetation, about 200 feet short of the runway. The airplane received structural damage to the wings and landing gear. An FAA inspector examined the airplane at the accident site. He found an electrical short in the landing light system. The inspector indicated that the electrical short also disabled the electronic ignition system on the engine.

Factual narrative

On September 3, 2006, about 2100 Alaska daylight time, a tundra tire-equipped amateur built experimental McNabb Javelin Bushmaster airplane, N5090F, sustained substantial damage following a forced landing and collision with terrain, at the Delta Junction Airport, Delta Junction, Alaska. The airplane was being operated by the pilot as a visual flight rules (VFR) local area personal flight under Title 14, CFR Part 91, when the accident occurred. The flight originated at the Delta Junction Airport about 1920. The commercial certificated pilot, the sole occupant, received minor injuries. Visual meteorological conditions prevailed, and no flight plan was filed.

During a telephone conversation with the National Transportation Safety Board (NTSB) investigator-in-charge (IIC), on September 3, the pilot reported that he was accumulating flight hours on the airplane for the builder, as part of a 40 hour flight test period to comply with an experimental type certificate. The pilot said that after 1.25 hours of flight time, he was on final approach for landing on runway 7. He said that when he turned on the airplane's landing light, the engine lost power. He was unable to restart the engine and descended into high vegetation, about 200 feet short of the runway. The airplane received structural damage to the wings and landing gear.

The airplane's engine was an automotive, Ford 3.8L, V-6. It was equipped with an electronic ignition system. An FAA inspector, Fairbanks Flight Standards District Office (FSDO), Fairbanks, Alaska, reported that he examined the airplane at the accident site. He found an electrical short in the landing light system. The inspector indicated that the electrical short also disabled the electronic ignition system on the engine.

Aircraft

Registration
N5090F
Reported as
McNabb Bushmaster
Category
Airplane, amateur-built
Serial number
001
Airframe hours
10
Engine
Ford 3.8 L, 230 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Timothy D. Smithen
Registered owner
Adam McNabb
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Condition · August 1, 2006
Departed
D66 · Delta Junction, AK
Airport
D66 · Delta Junction, runway 07, 2,400 × 50 ft, gravel

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
36
Injuries
Minor
Certificate
Commercial
Airplane ratings
Single-engine land
Instrument ratings
Airplane
Medical
Class 2, Without waivers/limitations
Last flight review
June 1, 2006
Seat
Left
Flight hours
1,000 total · 10 in this make and model · 700 as pilot in command · 12 in the last 90 days · 10 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Dusk
Wind
75° at 3 knots
Visibility
10 statute miles
Lowest ceiling
6,500 ft overcast
Temperature
55 °F, dew point 37 °F
Altimeter
30.04 inHg
Observed at
PABI, 10 nm away