# NTSB ERA24LA377: Mooney M20, N651RK, Oxford, CT, September 6, 2024 - Type: NTSB accident investigation - Classification: Accident · No injuries · Class 4 · Limited · Final report - Date: September 6, 2024, 15:25 local (19:25 UTC) - Place: Oxford, CT · Runway 18 - Coordinates: 41.478281, -73.135182 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=41.4783&lon=-73.1352&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-landing roll: Landing gear collapse](https://openairdocs.org/ntsb-events/094) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed - Report: Approved by Office Director - Investigation class: Class 4 - Basic report with no Prelim publish - NTSB office: Eastern Region Aviation - Parties: FAA/Bradley FSDO - NTSB case key (mKey): 195099 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ERA24LA377 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/195099/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=195099 - Page: https://openairdocs.org/ntsb/ERA24LA377 ## Probable cause The seizure of the right main landing gear extension rod bearing and subsequent buckling of the rod, resulting in a landing gear collapse. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Landing gear system: gear extension and retract sys](https://openairdocs.org/ntsb-findings/01023230): Aircraft › Aircraft systems · Failure (probable cause); cases with it: [Mooney M20F, 3 cases](https://openairdocs.org/ntsb-findings/01023230/cases.md?model=5870214), [All aircraft, 416 cases](https://openairdocs.org/ntsb-findings/01023230/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Landing-landing roll: Landing gear collapse](https://openairdocs.org/ntsb-events/094) (defining event); cases with it: [Mooney M20F, 3 cases](https://openairdocs.org/ntsb-events/094/sequence.md?model=5870214), [All aircraft, 1,787 cases](https://openairdocs.org/ntsb-events/094/sequence.md) ## Analysis The pilot was attempting the third landing on a training flight with his instructor. The airplane touched down normally with no crab or slip and the wind was calm. Shortly after touchdown, he heard a loud noise, and the right wing slowly lowered to the runway and scraped the surface. The airplane departed the runway to the right and came to a stop in the grass. The right main and nose landing gear collapsed; the left main gear remained extended. The airplane’s right wing was substantially damaged during the accident. Postaccident examination of the landing gear system revealed the forward end bearing on the right main landing gear extension rod was seized, and the rod was bent about 30°. Also, the rod ends on the two nose landing gear extension rods had been pulled out and the shear pins were sheared. Damage to the airplane prevented a functional test of the landing gear. ## Aircraft - Registration: [N651RK](https://openairdocs.org/aircraft/N651RK), registered now, S/N 680125, built 1968 (OpenAirDocs) - Reported make and model: MOONEY M20 (F) - Registry model: [Mooney M20F](https://openairdocs.org/model/mooney-m20f) (registry code 5870214) (OpenAirDocs) - Registry engine: [Lycoming I0360 series](https://openairdocs.org/engine/lycoming-i0360-series) (registry code 41515, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 680125 - Year built: 1968 - Airframe hours: 3716 - Engines: LYCOMING IO-360-A1A 180 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Airworthiness certificate: Standard, Normal - Last inspection: Annual, January 12, 2024 - Airport: OXC, Waterbury-Oxford Airport, runway 18, 5,801 × 100 ft, asphalt - Equipment: Electronic multifunction display, Electronic flight bag or handheld device, Auto-pilot, ADS-B, Stall warning system ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 38; injuries: none; private; airplane ratings: single-engine land; medical: class 2, without waivers/limitations; last flight review August 27, 2024; seat: left; restraint: lap only; flight hours: 107 total, 3 in this make and model, 20 as pilot in command, 13 in the last 90 days, 8 in the last 30 days, 2 in the last 24 hours - Flight instructor; age 55; injuries: none; flight instructor, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review February 11, 2023; seat: right; restraint: lap only; flight hours: 2,716 total, 2,077 in this make and model, 2,625 as pilot in command, 60 in the last 90 days, 11 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 110° at 6 knots - Visibility: 10 statute miles - Lowest ceiling: 2,500 ft broken - Temperature: 75 °F, dew point 64 °F - Altimeter: 30.09 inHg - Observed at: OXC - METAR: KOXC 061912Z 11006KT 10SM BKN025 BKN043 24/18 A3009 RMK AO2 PNO $ ## 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 20240906015329A](https://openairdocs.org/incident/20240906015329A), Sep 6, 2024: Mooney M20F, Oxford, CT, Substantial damage. While landing on runway 18 and tranisitioning into the rollout phase, [privacy data omitted] suffered a nose landing gear, and right main landing gear failure… ## Docket (3 files) The files NTSB released with the investigation on January 21, 2025, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=195099. 6.6 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 11 pages, 4.8 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=17940060&FileExtension=pdf&FileName=1%206120_Redacted-Rel.pdf - Memorandum for record - NTSB materials laboratory (item 2, PDF, 3 pages, 324 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=17933285&FileExtension=pdf&FileName=4%20NTSB%20MOR%20Kramer-Rel.pdf - Investigation photographs (item 3, PDF, 7 pages, 1.4 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=17934769&FileExtension=pdf&FileName=Investigation%20Photographs-Rel.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.