# NTSB CEN15LA116: Cessna 210, N9565X, Sullivan, MO, January 8, 2015 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: January 8, 2015, 16:40 local (22:40 UTC) - Place: Sullivan, MO - Coordinates: 38.233333, -91.8525 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=38.2333&lon=-91.8525&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing-flare/touchdown: Landing gear collapse](https://openairdocs.org/ntsb-events/094) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report April 26, 2016 - Report: Approved by Office Director - NTSB office: Central Region - Parties: FAA, Textron Aviation - NTSB case key (mKey): 90638 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN15LA116 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/90638/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=90638 - Page: https://openairdocs.org/ntsb/CEN15LA116 ## Probable cause The loss of hydraulic fluid and subsequent pressure due to cracks in the right main landing gear (MLG) actuator, which resulted in the collapse of the MLG during landing. ## 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: [Cessna 210B, 2 cases](https://openairdocs.org/ntsb-findings/01023230/cases.md?model=2073410), [All aircraft, 416 cases](https://openairdocs.org/ntsb-findings/01023230/cases.md) - [Landing gear system: gear extension and retract sys](https://openairdocs.org/ntsb-findings/01023230): Aircraft › Aircraft systems · Damaged/degraded (probable cause); cases with it: [Cessna 210B, 2 cases](https://openairdocs.org/ntsb-findings/01023230/cases.md?model=2073410), [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. - [Takeoff: Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330); cases with it: [Cessna 210B, 5 cases](https://openairdocs.org/ntsb-events/330/sequence.md?model=2073410), [All aircraft, 994 cases](https://openairdocs.org/ntsb-events/330/sequence.md) - [Landing-flare/touchdown: Landing gear collapse](https://openairdocs.org/ntsb-events/094) (defining event); cases with it: [Cessna 210B, 4 cases](https://openairdocs.org/ntsb-events/094/sequence.md?model=2073410), [All aircraft, 1,787 cases](https://openairdocs.org/ntsb-events/094/sequence.md) ## Analysis The private pilot was conducting a personal cross-country flight. The pilot reported that, after takeoff, he did not receive the cockpit annunciation indicating that the landing gear was retracted. An air traffic controller confirmed that the landing gear was not completely retracted, and the pilot proceeded to troubleshoot the issue without success. The pilot chose to fly to his home airport to land. Before landing, his mechanic communicated with him and stated that it appeared that the nose landing gear (NLG) was down, so the pilot chose to land on the runway. During the landing, the NLG remained extended; however, the main landing gear (MLG) collapsed, which resulted in substantial damage to the airplane. An examination of the landing gear system revealed that the right MLG actuator had cracked and leaked hydraulic fluid. Examination of the actuator revealed fatigue cracking that had initiated at the snap ring groove at the end of the actuator cylinder and then extended the length of the cylinder in ductile overload. No other anomalies with the landing gear system were noted. ## Factual narrative On January 8, 2015, about 1640 central standard time, a Cessna 210B airplane, N9565X, was substantially damaged when the main landing gear collapsed at the Sullivan Regional Airport (KUUV), Sullivan, Missouri. The private pilot was not injured. The personal flight was conducted under the provisions of 14 Code of Federal Regulations Part 91 without a flight plan. The flight departed Jefferson City Memorial Airport (KJEF), Jefferson City, Missouri, about 1600, and was en route to KUUV. According to the pilot, after takeoff he did not receive the cockpit annunciation indicating that the landing gear was retracted. The air traffic controller confirmed that the landing gear was not completely retracted. The pilot cycled the landing gear and utilized the hand pump; however he was unsuccessful in extending or retracting the landing gear. The pilot elected to fly to KUUV, his home airport, to land. His mechanic communicated with him and stated that it appeared that his nose landing gear was down so he elected to land on the runway. During the landing, the nose landing gear remained extended; however, the main landing gear collapsed. The spar on the right horizontal stabilizer was bent and the right wing skin, wing tip, and outer spar were bent. An examination of the landing gear system revealed that the right landing gear actuator (part number 1280501-2) was cracked and had leaked hydraulic fluid. An examination of the remaining system revealed no anomalies. The actuator was retained and shipped to a laboratory for further examination. The results of that examination revealed that the cylinder of the actuator cracked longitudinally and transversely. The crack initiated at the snap ring groove located at the end of the cylinder. The crack at the snap ring revealed signatures consistent with fatigue cracking. The crack which extended the length of the cylinder revealed signatures consistent with ductile overload. Details to the results of this examination are available in the docket to this report. The most recent annual inspection was conducted on October 22, 2013. There was no recent maintenance conducted on the landing gear. ## Aircraft - Registration: [N9565X](https://openairdocs.org/aircraft/N9565X), registered now, S/N 21057865, built 1962 (OpenAirDocs) - Reported make and model: CESSNA 210 (B) - Registry model: [Cessna 210B](https://openairdocs.org/model/cessna-210b) (registry code 2073410) (OpenAirDocs) - Registry engine: [Continental I0-470 series](https://openairdocs.org/engine/continental-i0-470-series) (registry code 17027, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 21057865 - Year built: 1962 - Engines: CONT MOTOR IO-470-S12B 300 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Airworthiness certificate: Standard, Normal - Last inspection: Annual, October 22, 2013 - Departed: KJEF, Jefferson City, MO - Destination: KUUV, Sullivan, MO - Airport: KUUV, Sullivan Regional Airport, runway 24, 4,500 × 75 ft, concrete - Equipment: Satellite tracking device, Onboard weather, Stall warning system ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 68; injuries: none; private; airplane ratings: single-engine land; medical: class 3, without waivers/limitations; last flight review April 12, 2013; seat: left; flight hours: 2,174.5 total, 1,221 in this make and model, 1.6 in the last 90 days, 0.5 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 220° at 9 knots, gusting 16 - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 28 °F, dew point -0 °F - Altimeter: 30.07 inHg - Observed at: KFYG, 23 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 20150108000599A](https://openairdocs.org/incident/20150108000599A), Jan 8, 2015: Cessna 210B, Sullivan, MO, Substantial damage. On January 08, 2015 at approximately 16:40, a Cessna 210, registration number N9565X operating CFR part 91 experienced a situation where the landing gear would… ## Other investigations on N9565X (1) 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 OAK67D0148](https://openairdocs.org/ntsb/OAK67D0148), Oct 29, 1966: Cessna 210 (N9565X), Las Vegas, NV, substantial damage ## Docket (4 files) The files NTSB released with the investigation on March 8, 2016, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=90638. 8.8 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 858 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40437439&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Master.PDF - Record of Conversation - Mechanic (item 2, .PDF, 53 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40437440&FileExtension=.PDF&FileName=Record%20of%20Conversation%20-%20Mechanic-Master.PDF - Laboratory Report - Actuator Examination (item 3, .PDF, 7.5 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40437441&FileExtension=.PDF&FileName=Laboratory%20Report%20-%20Actuator%20Examination-Master.PDF - Statement of Party Representatives to NTSB Investigation (item 4, .PDF, 343 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40437442&FileExtension=.PDF&FileName=Statement%20of%20Party%20Representatives%20to%20NTSB%20Investigation-Master.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.