# NTSB LAX02LA082: Beech B36TC, N6427N, Mammoth Lakes, CA, January 21, 2002 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: January 21, 2002, 11:00 local (19:00 UTC) - Place: Mammoth Lakes, CA - Coordinates: 37.580623, -118.84056 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=37.5806&lon=-118.8406&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 5 uninjured - Status: Completed, report September 30, 2003 - Report: Approved by Office Director - Parties: FAA Flt Stnds Dist Office - NTSB case key (mKey): 54184 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX02LA082 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/54184/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=54184 - Page: https://openairdocs.org/ntsb/LAX02LA082 ## 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. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Dragged wing,rotor,pod,float or tail/skid, takeoff - roll/run - weather condition - crosswind - weather condition - variable wind (cause) - compensation for wind conditions - inadequate, pilot in command (cause) - compensation for wind conditions - improper, pilot in command (cause) ## Analysis 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. ## Factual 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. ## Aircraft - Registration: N6427N (not matched to a registry record) - Reported make and model: Beech B36TC - Category: Airplane - Serial number: EA-297 - Engines: Continental TSIO-520-UB 300 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Michael E. McMann - Airworthiness certificate: Standard, Normal - Departed: MMH, Mammoth Lakes, CA - Destination: VNY, Van Nuys, CA - Airport: MMH, Mammoth Yosemite, runway 27, 7,000 × 100 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 49; injuries: none; airline transport, flight instructor; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 3, valid medical--w/ waivers/lim; seat: left; flight hours: 2,000 total, 75 in this make and model, 1,900 as pilot in command, 60 in the last 90 days, 20 in the last 30 days, 3 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 200° at 18 knots, gusting 31 - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 43 °F, dew point 18 °F - Altimeter: 30.00 inHg - Observed at: MMH ## FAA reports on this event (1) The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs). - [Accident 20020121001179A](https://openairdocs.org/incident/20020121001179A), Jan 21, 2002: Beech B36TC, Mammoth Lakes, CA, No damage. (.19) 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… ## Docket (1 files) The files NTSB released with the investigation on July 29, 2003, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=54184. 297 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 297 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40380543&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.