# NTSB CEN22LA204: Cessna T210N, N210SD, Denver, CO, May 17, 2022

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Class 3 · Limited · Final report
- Date: May 17, 2022, 16:00 local (22:00 UTC)
- Place: Denver, CO
- Coordinates: 39.908412, -105.11562 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=39.9084&lon=-105.1156&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 3
- NTSB office: Central Region
- Parties: FAA
- NTSB case key (mKey): 105097
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN22LA204
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/105097/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=105097
- Page: https://openairdocs.org/ntsb/CEN22LA204

## Probable cause

The main landing gear collapsed during landing for reasons that could not be determined.

## 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 · Malfunction (probable cause); cases with it: [Cessna T210N, 3 cases](https://openairdocs.org/ntsb-findings/01023230/cases.md?model=2073456), [All aircraft, 416 cases](https://openairdocs.org/ntsb-findings/01023230/cases.md)
- [Not determined](https://openairdocs.org/ntsb-findings/05000000): Not determined › Not determined · Unknown/Not determined (probable cause); cases with it: [Cessna T210N, 8 cases](https://openairdocs.org/ntsb-findings/05000000/cases.md?model=2073456), [All aircraft, 2,247 cases](https://openairdocs.org/ntsb-findings/05000000/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: [Cessna T210N, 8 cases](https://openairdocs.org/ntsb-events/094/sequence.md?model=2073456), [All aircraft, 1,787 cases](https://openairdocs.org/ntsb-events/094/sequence.md)

## Analysis

The pilot and his passenger were performing a local flight after the installation of a new GPS system. After flying for about 15 minutes, the pilot lowered the landing gear in preparation to land. The pilot observed the landing gear in an extended position via landing gear mirrors and confirmed a cockpit gear down light indication. After touchdown, the main landing gear collapsed. The airplane skidded and came to rest upright on an adjacent taxiway. The airplane sustained substantial damage to the left horizontal stabilizer and left elevator. Postaccident examination of the landing gear system revealed no anomalies that would have precluded normal operation. During the examination, 10 landing gear extensions and retractions were performed without any anomalies noted with the system. The cockpit landing gear light indications functioned during each gear cycle, and no leaks in the system were detected. The reason for the main landing gear collapse could not be determined.

## Factual narrative

On May 17, 2022, at 1600 mountain daylight time, a Cessna T210N airplane, N210SD, sustained substantial damage when it was involved in an accident near Denver, Colorado. The pilot and passenger were not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. According to the pilot, he and his passenger were performing a local flight after the installation of a new GPS system. After flying for about 15 minutes, the pilot lowered the landing gear in preparation to land. The pilot observed the landing gear in an extended position via landing gear mirrors and confirmed a cockpit gear down light indication. After touchdown, the main landing gear collapsed. The airplane skidded and came to rest upright on an adjacent taxiway. According to airport surveillance video, the airplane’s landing gear appeared to be extended, and the airplane touched down uneventfully. The airplane sustained substantial damage to the left horizontal stabilizer and left elevator. Postaccident examination of the landing gear system revealed no anomalies that would have precluded normal operation. A Federal Aviation Administration inspector and a mechanic performed 10 landing gear extensions and retractions without any system anomalies noted. The cockpit landing gear light indications functioned during each gear cycle and no leaks in the system were detected.

## Aircraft

- Registration: [N210SD](https://openairdocs.org/aircraft/N210SD), registered now, S/N 21064225, built 1980 (OpenAirDocs)
- Reported make and model: CESSNA T210N
- Registry model: [Cessna T210N](https://openairdocs.org/model/cessna-t210n) (registry code 2073456) (OpenAirDocs)
- Registry engine: [Continental TSIO-520 series](https://openairdocs.org/engine/continental-tsio-520-series) (registry code 17040, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 21064225
- Year built: 1980
- Airframe hours: 2948
- Engines: CONT MOTOR TSIO-520 SER 300 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, March 15, 2022
- Flight plan: VFR
- Airport: BJC, Rocky Mountain Metro Airport, runway 12L, 9,000 × 100 ft, asphalt
- Equipment: Electronic multifunction display, Auto-pilot, ADS-B, Stall warning system, Onboard weather, Electronic primary flight display

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 42; injuries: none; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 3, with waivers/limitations; last flight review April 3, 2021; seat: left; restraint: 3-point; flight hours: 826 total, 363 in this make and model, 754 as pilot in command, 36 in the last 90 days, 29 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 30° at 15 knots, gusting 20
- Visibility: 10 statute miles
- Lowest ceiling: 8,000 ft broken
- Temperature: 75 °F, dew point 34 °F
- Altimeter: 30.00 inHg
- Observed at: KBJC, 1 nm away
- METAR: KBJC 172259Z 03015G20KT 10SM BKN080 24/01 A3000

## Docket (4 files)

The files NTSB released with the investigation on November 7, 2023, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=105097. 7.7 MB in all.

- Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 9 pages, 3.6 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=14191578&FileExtension=pdf&FileName=Pilot%206120_Redacted-Rel.pdf
- FAA record of conversation (item 2, PDF, 1 page, 145 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=14191612&FileExtension=pdf&FileName=RECORD%20OF%20CONVERSATION%20508-Rel.pdf
- Accident photographs (item 3, PDF, 2 pages, 1.7 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=14190483&FileExtension=pdf&FileName=Photo%20Array-Rel.pdf
- Airport surveillance video (item 4, AVI, 2.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=16265563&FileExtension=avi&FileName=Touchdown%20West-Rel.avi

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.

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