SEA94LA184

NTSB accident investigation · Black RV-4 · Twisp, WA · July 17, 1994

Accident · No injuriesLimited investigationFinal report
Date
July 17, 1994, 11:20 local (18:20 UTC)
Place
Twisp, WA
Injuries
1 uninjured
Damage
Substantial damage
Phase of flight
Landing
Aircraft
N144USBlack RV-4
Weather
Visual (VMC) · Day
Status
Completed · report December 2, 1994
Report
Approved by Office Director
FAA report
19940717036959A
Case key
41979

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

Proper descent rate was not maintained during approach.

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.

Hard landingLanding
Proper descent rate - not maintainedPilot in commandCause

Analysis

The pilot of the amateur-built experimental black RV-4 said that 'the bottom dropped out' when he was on approach for landing. The aircraft bounced back into the air after a hard landing, with its throttle and mixture control jammed. The pilot was able to fly the aircraft, which was substantially damaged during the hard landing, to another airport and successfully land.

Factual narrative

On July 17, 1994, approximately 1120 Pacific daylight time, an experimental Black RV-4, N144US, sustained substantial damage while landing at Twisp, Washington. The private pilot, who owned the aircraft and was the sole occupant, was uninjured. Visual meteorological conditions prevailed at the time of the accident. No flight plan was filed for the flight from Methow Valley Airport, Winthrop, Washington.

The pilot, who built the aircraft and had approximately 800 hours in the aircraft, stated that on short final the "bottom dropped out," and the aircraft landed hard, bending the gear and engine mount, and buckled the firewall. The wing was also damaged by impact with a fence post that was apparently near the runway threshold. The pilot stated that the aircraft ended up back in the air. He did not know if he pushed the throttle forward during the impact sequence, but he had a stuck throttle and mixture control. He said that he flew the aircraft back to Methow Valley Airport and landed successfully.

Aircraft

Registration
N144US
Reported as
Black RV-4
Category
Airplane, amateur-built
Serial number
742
Airframe hours
732
Engine
Lycoming O-320-E2D, 150 horsepower, reciprocating
Damage
Substantial damage
Flight
Personal · Part 91
Operator
Kefton O. Black
Registered owner
Kefton O. Black
Airworthiness certificate
Special, Experimental (Special)
Last inspection
Annual · October 27, 1993 · 12 hours before
Departed
S52 · Winthrop, WA
Airport
2S0 · Twisp Municipal, runway 28, 2,700 × 40 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
50
Certificate
Private
Airplane ratings
Single-engine land
Medical
Class 3, Valid Medical--w/ waivers/lim
Seat
Front
Flight hours
1,020 total · 525 in this make and model · 934 as pilot in command · 11 in the last 90 days · 3 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
360° at 5 knots, gusting 10
Visibility
20 statute miles
Lowest ceiling
None
Temperature
90 °F

FAA reports on this event · 1

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