# NTSB DEN99LA129: Boeing A-75-N1 (Stearman), N56772, Tooele, UT, July 26, 1999 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: July 26, 1999, 12:00 local (18:00 UTC) - Place: Tooele, UT - Coordinates: 40.569438, -112.330284 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=40.5694&lon=-112.3303&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report November 30, 2000 - Report: Approved by Office Director - NTSB case key (mKey): 46919 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN99LA129 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/46919/pdf - Page: https://openairdocs.org/ntsb/DEN99LA129 ## Probable cause The failure of the right main landing gear tire's inner tube, and the subsequent inadvertent ground loop by the pilot. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Airframe/component/system failure/malfunction, landing - flare/touchdown - landing gear,tire - failure (cause) - Loss of control - on ground/water, landing - roll - ground loop/swerve - inadvertent, pilot in command (cause) ## Analysis While performing a main wheel landing on runway 34, the pilot said that the airplane bounced once, and then 'swerved right.' He said that he applied a 'strong correction to the left to bring the airplane's nose back to the centerline.' The airplane subsequently ground looped to the left. Postaccident examination of the right main tire disclosed that its inner tube had failed. ## Factual narrative On July 26, 1999, approximately 1200 mountain daylight time, a Boeing A-75-N1 (Stearman), N56772, was substantially damaged following a ground loop during landing at Bolinder Field-Tooele Valley, Tooele, Utah. The airline transport rated pilot, the sole occupant in the airplane, was not injured. The airplane was being operated by the pilot under Title 14 CFR Part 91. Visual meteorological conditions prevailed for the cross-country flight which originated from Elko, Nevada, approximately 1 hour before the accident. A VFR flight plan had been filed. The pilot reported that while performing a main wheel landing on runway 34, the airplane bounced once, and then "swerved right." He said that he applied a "strong correction to the left to bring the airplane's nose back to the centerline." The airplane subsequently turned left damaging the right aileron and right rear spar. Postaccident examination of the right main tire by the pilot disclosed that its inner tube had failed. ## Aircraft - Registration: [N56772](https://openairdocs.org/aircraft/N56772), registered now, S/N 75-2451, built 1941 (OpenAirDocs) - Reported make and model: Boeing A-75-N1 (STEARMAN) (A-75-N1 (S) - Registry model: [Boeing A75N1(PT17)](https://openairdocs.org/model/boeing-a75n1-pt17) (registry code 1380134) (OpenAirDocs) - Registry engine: [Pratt & Whitney R-985 series](https://openairdocs.org/engine/pratt-whitney-r-985-series) (registry code 52008, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 75-2451 - Airframe hours: 8600 - Engines: P&W R-985 450 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Thomas C. Lambrick - Registered owner: Far West Aviation, Inc. - Airworthiness certificate: Standard, Normal - Last inspection: Annual, December 4, 1998, 110 hours before - Departed: EKO, ELKO, NV - Destination: TVY - Airport: TVY, Bolinder Field-Tooele Val, runway 34, 5,498 × 75 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 60; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: front; flight hours: 21,525 total, 13,500 as pilot in command, 48 in the last 90 days, 21 in the last 30 days, 6 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 340° at 5 knots - Visibility: 100 statute miles - Lowest ceiling: none - Temperature: 81 °F - Altimeter: 30.00 inHg ## 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 19990726017609A](https://openairdocs.org/incident/19990726017609A), Jul 26, 1999: Boeing A75N1, Tooele, UT, Substantial damage. (.19) On July 26, 1999 approximately 1100 mountain daylight time, a Boeing PT-17 (stearman), N56772, was substantially damaged following impact with terrain… ## Other investigations on N56772 (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 LAX83LVD01](https://openairdocs.org/ntsb/LAX83LVD01), Oct 10, 1982: Boeing A75 (N56772), Ft. Bragg, CA, destroyed - [NTSB OAK67F0012](https://openairdocs.org/ntsb/OAK67F0012), Apr 19, 1966: Stearman A75 (N56772), Robbins, CA, 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.