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NTSB Report

January 21, 2002 · Beech B36TC · N6427N

Mammoth Lakes, CA

Overview

Report Status
Final with probable cause
Event Type
Accident
Date
January 21, 2002
Injury Outcomes
No injuries (5 uninjured)
Location
Mammoth Lakes, CA
Aircraft
Beech B36TC
Tail Number
N6427N
Injuries
None
Aircraft Damage
Substantial
NTSB Number
LAX02LA082

During takeoff in a quartering left crosswind, the left wingtip dropped and contacted the runway surface. The pilot reported that two other aircraft, one of similar weight and size, had departed ahead of him as he performed his run-up. The windsock indicated the wind was variable from down the runway to a 45-degree left crosswind at 15 to 20 knots. During his takeoff roll, as he rotated the airplane for liftoff, the airplane encountered a "strong side gust," which caused the airplane to yaw into the wind, one wing to lift, and the other to drop and contact the runway. Following the wingtip contact with the runway, the pilot aborted the takeoff and brought the airplane to a stop on the remaining runway. The surface wind, recorded by the Automated Weather Observing System (AWOS) 48 minutes after the accident, was a 70-degree left crosswind at 18 knots with gusts to 31 knots.

NTSB Probable Cause

The onset of variable, gusty, crosswind conditions at the time of departure and the pilot's inadequate and improper compensation for the crosswind conditions.

Full Narrative

On January 21, 2002, at 1100 Pacific standard time, a Beech B36TC, N6427N, contacted the runway surface with the left wingtip during takeoff from the Mammoth Yosemite Airport, Mammoth Lakes, California. The airline transport certificated pilot and four passengers were not injured. The airplane was substantially damaged. The personal flight was operated by the owner under 14 CFR Part 91, and was destined for Van Nuys, California. Visual meteorological conditions prevailed and no flight plan was filed. The airplane departed on runway 27 (7,000 feet long by 100 feet wide, asphalt). The pilot reported that two other aircraft, one of similar weight and size, departed ahead of him as he performed his run-up. The windsock indicated the wind was variable from down the runway to a 45-degree left crosswind at 15 to 20 knots. During his takeoff roll, as he rotated the airplane for liftoff, the airplane encountered a "strong side gust," which caused the airplane to yaw into the wind, one wing to lift, and the other to drop and contact the runway. Following the wingtip contact with the runway, the pilot aborted the takeoff and brought the airplane to a stop on the remaining runway. The recorded Automated Weather Observing System (AWOS) surface wind, 48 minutes after the accident, was from 200 degrees at 18 knots with gusts to 31 knots.

Flight

Event TypeAccident
Event Time11:00 PST
Nearest AirportMammoth Yosemite (0nm)
Runway27
Runway Length7000 ft
Runway Width100 ft
Flight Plan FiledNone
Flight Plan ActivatedNo
Aircraft FireNo
Aircraft ExplosionNo

Aircraft

AircraftBeech B36TC
Tail NumberN6427N
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · TSIO-520-UB · Reciprocating · 300
Seats6

People & Injuries

Injury SummaryNo injuries (5 uninjured)
Fatal0
Serious0
Minor0
Uninjured5
Total5
Crew 1Age 49 · Third Class · None

Conditions

ConditionsVMC
LightDaylight
Wind200° @ 18 kt, gusting 31 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point43 C / 18 C
Altimeter30.00 inHg
Observation Time19:48
Weather SourceWFAC

Appendix: Source Data