SEA07LA059

NTSB accident investigation · Barnhart RV-6 · Auburn, WA · February 21, 2007

Accident · Minor injuriesLimited investigationFinal report
Date
February 21, 2007, 14:15 local (22:15 UTC)
Place
Auburn, WA
Injuries
1 minor
Damage
Substantial damage
Phase of flight
Initial climb
Aircraft
N601DBBarnhart RV-6
Weather
Visual (VMC) · Day
Status
Completed · report June 27, 2007
Report
Approved by Office Director
Parties
FAA FSDO
FAA report
20070221002629A
Case key
65264

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 NTSB’s determination of the probable cause, and any contributing factors.

A loss of engine power due to the obstruction of the engine's air inlet by a fabricated neoprene seal, and inadequate maintenance by unknown maintenance personnel. A contributing factor was the lack of suitable terrain for a forced landing.

Analysis

During the initial climb after take off, the airplane's engine lost power. The pilot said there was a motel and casino in front of him, so he performed a 90 degree left-hand turn. The pilot landed the airplane parallel to and inside the airport perimeter fence with the right wing sliding along the fence. The airplane landed hard on both main landing gear and they collapsed. Additionally the engine mounts were broken, the engine firewall was wrinkled, both wings exhibited buckling and wrinkling, and the fuselage was wrinkled. Post accident examination of the engine revealed that a large piece of neoprene was lodged in the engine's air intake. The pilot said that he and the mechanic fabricated a neoprene seal for the engine's air intake during the conditional inspection, which was completed on February 12, 2007. The airplane had flown 0.2 hours, out of conditional inspection, at the time of the accident.

Factual narrative

On February 21, 2007, at approximately 1415 Pacific standard time, a Barnhart RV-6 experimental homebuilt airplane, N601DB, was substantially damaged during a forced landing attempt following a loss of engine power at Auburn Municipal Airport (S50), Auburn, Washington. The airline transport pilot, the sole occupant on board, received minor injuries. The pilot/owner was operating the airplane under Title 14 CFR Part 91. Visual meteorological conditions prevailed for the local flight which was originating at the time of the accident. A flight plan had not been filed.

The pilot said that he had just departed from runway 16 when the airplane's engine lost power. He said that at that moment there was a motel and casino in front of him, so he performed a 90 degree left-hand turn. The pilot landed the airplane parallel to and inside the airport perimeter fence with the right wing sliding along the fence. The airplane landed hard on both main landing gear, and they immediately collapsed. Additionally the engine mounts were broken, the engine firewall was wrinkled, both wings exhibited buckling and wrinkling, and the fuselage was wrinkled.

Postaccident examination of the engine revealed that a large piece of neoprene was lodged in the engine's air intake. The pilot said that he and the mechanic fabricated a neoprene seal for the engine's air intake during the conditional inspection, which was completed on February 12, 2007. The pilot said he departed Boeing Field, Seattle, Washington, and flew to Auburn, Washington, for a touch-and-go landing. The airplane had flown 0.2 hours, out of conditional inspection, at the time of the accident.

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 powerTakeoff - initial climb
Maintenance,installation - inadequateOther maintenance personnelCause
Engine inlet assembly - blocked(partial)Cause
Forced landingEmergency descent/landing
Hard landingEmergency landing after takeoff
Terrain condition - none suitableFactor

Aircraft

Registration
N601DB
Reported as
Barnhart RV-6
Category
Airplane, amateur-built
Serial number
23744
Airframe hours
430
Engine
Lycoming IO-320, 160 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Registered owner
James H. Thomson
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Condition · February 1, 2007 · 0.2 hours before
Departed
S50 · Auburn, WA
Destination
S50 · Auburn, WA
Airport
S50 · Auburn Municipal Airport, runway 16, 3,400 × 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
49
Injuries
None
Certificates
Airline transport, Military
Airplane ratings
Single-engine land, Multi-engine land
Instrument ratings
Airplane
Medical
Class 1, With waivers/limitations
Last flight review
September 1, 2006
Seat
Left
Flight hours
20,571 total · 153 in this make and model · 16,000 as pilot in command · 223 in the last 90 days · 100 in the last 30 days · 7 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
200° at 3 knots
Visibility
10 statute miles
Lowest ceiling
None
Temperature
48 °F, dew point 27 °F
Altimeter
29.88 inHg
Observed at
SEA, 8 nm away

FAA reports on this event · 1

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