# NTSB CEN11LA494: Cessna T210L, N2056S, Columbia, MO, July 20, 2011 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: July 20, 2011, 13:25 local (18:25 UTC) - Place: Columbia, MO - Coordinates: 38.819168, -92.221664 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=38.8192&lon=-92.2217&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing: Landing gear collapse](https://openairdocs.org/ntsb-events/094) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report December 19, 2012 - Report: Approved by Office Director - NTSB office: Central Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 81189 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN11LA494 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/81189/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=81189 - Page: https://openairdocs.org/ntsb/CEN11LA494 ## Probable cause The collapse of the right main landing gear during landing due to a lack of component lubrication, which resulted in the failure of the landing gear to lock once extended. ## 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 T210L, 10 cases](https://openairdocs.org/ntsb-findings/01023230/cases.md?model=2073449), [All aircraft, 416 cases](https://openairdocs.org/ntsb-findings/01023230/cases.md) - [Landing gear system: main landing gear](https://openairdocs.org/ntsb-findings/01023210): Aircraft › Aircraft systems · Not specified (probable cause); cases with it: [Cessna T210L, 3 cases](https://openairdocs.org/ntsb-findings/01023210/cases.md?model=2073449), [All aircraft, 241 cases](https://openairdocs.org/ntsb-findings/01023210/cases.md) - [Maintenance: repair](https://openairdocs.org/ntsb-findings/02062015): Personnel issues › Task performance · Maintenance personnel; cases with it: [Cessna T210L, 1 case](https://openairdocs.org/ntsb-findings/02062015/cases.md?model=2073449), [All aircraft, 99 cases](https://openairdocs.org/ntsb-findings/02062015/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Approach: Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330); cases with it: [Cessna T210L, 5 cases](https://openairdocs.org/ntsb-events/330/sequence.md?model=2073449), [All aircraft, 994 cases](https://openairdocs.org/ntsb-events/330/sequence.md) - [Landing: Landing gear collapse](https://openairdocs.org/ntsb-events/094) (defining event); cases with it: [Cessna T210L, 6 cases](https://openairdocs.org/ntsb-events/094/sequence.md?model=2073449), [All aircraft, 1,787 cases](https://openairdocs.org/ntsb-events/094/sequence.md) - [Landing: Runway excursion](https://openairdocs.org/ntsb-events/300); cases with it: [Cessna T210L, 9 cases](https://openairdocs.org/ntsb-events/300/sequence.md?model=2073449), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md) - [Landing: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Cessna T210L, 10 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=2073449), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The pilot was unable to obtain cockpit landing gear down-and-locked indications while on a visual approach to the destination airport. After repeated attempts to actuate the emergency landing gear extension system, he was still unable to obtain a gear down-and-locked indication. He overflew the airport so that air traffic control personnel could observe the landing gear position, which was observed as extended. The pilot then attempted a landing, during which the right main landing gear collapsed, and the airplane veered off the runway and hit a runway sign. During the repair of the landing gear system, several components exhibited a lack of lubrication, which resulted in the landing gear failing to lock when extended. Once the components were cleaned, lubricated, and adjusted, the landing gear functioned normally. The airplane and landing gear system were last inspected and repaired about 8 months prior to the accident during which adequate lubrication of the landing gear components should have been confirmed. ## Factual narrative On July 20, 2011, about 1325 central daylight time, a Cessna T210L, N2056S, experienced a collapsed right main landing gear during landing at Columbia Regional Airport (COU), Columbia, Missouri. The private pilot was uninjured. The airplane sustained substantial damage to the horizontal stabilizer. The airplane was registered to and operated by Atlatl LLC under the provisions of 14 Code of Federal Regulations Part 91 as a business flight. Visual meteorological conditions prevailed and a flight plan had not been filed for the flight destined for COU. The pilot stated that while on a visual approach to runway 20 (6,501 feet by 150 feet, concrete) and about 3 miles from COU, he moved the landing gear handle to the down position. The landing gear extended, but the landing gear indicator lights did not indicate that the landing gear was locked in the down position and he could hear the landing gear hydraulic pump running. He then cycled the gear two times, but the landing gear still would not lock into the down position. He cycled the landing gear six more times, but the landing gear did not lock down and the hydraulic pump stopped making a sound. He then extended the emergency gear pump handle and pumped it 75-100 times, which became very stiff. He flew over the airport so that air traffic control personnel could observe the landing gear, which they reported as being extended; however, the cockpit indication was indicating that the landing gear was not locked down. During final approach for landing on runway 20, he pumped the emergency gear pump handle "many more times," but the landing gear still did not lock down. During touchdown, the right main landing gear collapsed. The airplane departed the runway surface and stopped near the intersection of taxiway A2 and runway 20. The airplane struck, and broke off from its base, the hold short sign at taxiway A2. According to the Federal Aviation Administration, postaccident repair, by a maintenance facility other than the one that performed the airplane's last annual inspection, indicated that a lack of lubrication resulted in the main landing gear not locking down. Several items such as bolts, pins, and bushings were cleaned, lubricated, and adjusted after which the landing gear function normally. The airplane has flown several times without further incident. According to an airframe maintenance logbook entry dated November 12, 2010, the airplane received an annual inspection at a tachometer time of 205.1 hours and a total time 11,080.8 hours. The entry states, "Jacked aircraft serviced landing gear system... ." Items that were replaced included all of the downlock hydraulic hoses and a right hand landing gear actuator fitting. The logbook entry is included in the docket of this report. ## Aircraft - Registration: [N2056S](https://openairdocs.org/aircraft/N2056S), registered now, S/N 21061023, built 1975 (OpenAirDocs) - Reported make and model: CESSNA T210L - Registry model: [Cessna T210L](https://openairdocs.org/model/cessna-t210l) (registry code 2073449) (OpenAirDocs) - Registry engine: [Continental TSIO-520 series](https://openairdocs.org/engine/continental-tsio-520-series) (registry code 17040, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 21061023 - Airframe hours: 11095 - Engines: Continental TSIO-520-R 310 horsepower reciprocating - Damage: Substantial damage - Flight: Business, Part 91 - Operator: Atlatl LLC - Registered owner: Atlatl LLC - Airworthiness certificate: Standard, Normal - Last inspection: Annual, November 12, 2010 - Departed: CGI, Cape Girardeau, MO - Destination: COU, Columbia, MO - Airport: COU, Columbia Regional Airport, runway 20, 6,501 × 150 ft, concrete ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 47; injuries: none; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 3, with waivers/limitations; last flight review April 7, 2011; seat: left; flight hours: 498 total, 304 in this make and model, 295 as pilot in command, 4 in the last 90 days, 4 in the last 30 days, 0 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 250° at 9 knots, gusting 20 - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 93 °F, dew point 73 °F - Altimeter: 29.90 inHg - Observed at: COU ## 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 20110720016469A](https://openairdocs.org/incident/20110720016469A), Jul 20, 2011: Cessna T210L, Columbia, MO, Substantial damage. After a flight from cape girardeau (kcgi), Missouri, to Columbia (cou), Missouri, the pilot could not get a landing gear down and locked indication. After… ## Docket (4 files) The files NTSB released with the investigation on October 23, 2012, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=81189. 1.0 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 701 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40372855&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - Airport Report (item 2, .PDF, 144 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40372857&FileExtension=.PDF&FileName=Airport%20Report-Redacted.PDF - Record of Examination (item 3, .PDF, 52 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40372864&FileExtension=.PDF&FileName=Record%20of%20Examination-Master.PDF - Maintenance Record - Excerpt (item 4, .PDF, 114 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40372861&FileExtension=.PDF&FileName=Maintenance%20Record%20-%20Excerpt-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.