# NTSB MIA97LA253: Cessna 411, N12WT, Williston, FL, September 13, 1997 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: September 13, 1997, 16:40 local (20:40 UTC) - Place: Williston, FL - Coordinates: 29.369583, -82.450927 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=29.3696&lon=-82.4509&mi=10 - Phase of flight: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report April 10, 1998 - Report: Approved by Office Director - NTSB case key (mKey): 38341 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA97LA253 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/38341/pdf - Page: https://openairdocs.org/ntsb/MIA97LA253 ## Probable cause the pilot-in-command's excessive taxi speed. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Main gear collapsed, taxi - from landing - landing gear,main gear attachment - overload - taxispeed - excessive, pilot in command (cause) ## Analysis While attempting a 130-degree change in direction to the right off the runway while travelling, according to witnesses, 'a little fast', the left main landing gear collapsed. Examination of the left main landing gear revealed that the side brace lock bolt was failed. Metallurgical examination of the failed bolt revealed that it failed due to shear. Hardness tests indicate that it was within limits. The bolt had been installed 3.0 hours earlier during the last annual inspection. ## Factual narrative On September 13, 1997, about 1640 eastern daylight time, a Cessna 411, registered to a private individual, experienced a collapse of the left main landing gear while taxiing off the runway at the Williston Municipal Airport, Williston, Florida. The airplane was substantially damaged and the commercial-rated pilot and one passenger were not injured. The flight originated about 10 minutes earlier form the Ocala Regional/Jim Taylor Field Airport, Ocala, Florida. The pilot stated that after landing on runway 22 while attempting to turn off the runway onto taxiway A, the left main landing gear collapsed. According to a private pilot-rated witness, the airplane was traveling "a little fast" when the pilot attempted to turn onto the taxiway. Review of the airport layout revealed an approximate 130-degree change in direction to the right from the runway centerline to the centerline of Taxiway A. The damage was initially reported the day of the occurrence as minor; however, a subsequent detailed inspection revealed spar damage to the left wing. Postaccident examination of the left main landing gear revealed that the side brace lock attaching bolt Part No. AN25-38A, was failed. Metallurgical examination of the failed bolt revealed that it failed due to shear. No evidence of preexisting cracks or corrosion was noted. Hardness tests were performed at three portions on the grip portion of the bolt which revealed values of 28.8, 28.9 and 30.0 RH C respectively. Review of the Military Handbook Identification Markings For Fasteners, Bolts, Screws, Studs, Nuts, and Rivets, revealed that based on the bolt head configuration and markings, the specified RH: C values are between 26-32. Review of the maintenance records revealed that the bolt had been replaced at the last annual inspection which was accomplished on September 1, 1997. The airplane had accumulated 3.0 hours since the inspection at the time of the failure. The airplane minus the retained hardware was released to Mr. Dave Lucas of Dave Lucas International on December 11, 1997. The retained hardware was also released to Mr. Lucas on December 19, 1997. ## Aircraft - Registration: [N12WT](https://openairdocs.org/deregistered/N12WT-1999-05-07), registration cancelled 1999-05-07, S/N 411-0080 (OpenAirDocs) - Reported make and model: Cessna 411 - Registry model: [Cessna 411](https://openairdocs.org/model/cessna-411) (registry code 2075902) (OpenAirDocs) - Category: Airplane - Serial number: 411-0080 - Airframe hours: 4232 - Engines: Continental GTSIO-520-C 340 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Neal J. Fisher - Airworthiness certificate: Standard, Normal - Last inspection: Annual, September 1, 1997, 3 hours before - Departed: OCF, OCALA, FL - Destination: X60 - Airport: X60, Williston Municipal, runway 22, 5,050 × 150 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 23; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 1,202 total, 150 in this make and model, 830 as pilot in command, 25 in the last 90 days, 10 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 50° at 4 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 93 °F, dew point 68 °F - Altimeter: 29.00 inHg - Observed at: OCF, 17 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 (OpenAirDocs). - [Accident 19970913026539A](https://openairdocs.org/incident/19970913026539A), Sep 13, 1997: Cessna 411, Williston, FL, Substantial damage. Narrative: on September 13, 1997 at 1630 EDT, Mr. Sean m. critelli, holder of pilot certificate no.592502900, landed and taxied a Cessna 411, N12WT, at… ## Other investigations on N12WT (2) 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. - [NTSB LAX73DUG28](https://openairdocs.org/ntsb/LAX73DUG28), Jan 2, 1973: Cessna 411 (N12WT), Bermuda Dns, CA, substantial damage - [NTSB DEN72FTE53](https://openairdocs.org/ntsb/DEN72FTE53), Jan 6, 1972: Cessna 411 (N12WT), Denver, CO, substantial damage 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.