# NTSB WPR13CA413: Cessna T310R, N712SB, San Luis Obispo, CA, September 16, 2013 - Type: NTSB accident investigation - Classification: Accident · No injuries · Data collection · Final report - Date: September 15, 2013, 19:51 local (Sep 16, 2013, 02:51 UTC) - Place: San Luis Obispo, CA - Coordinates: 35.235553, -120.638885 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=35.2356&lon=-120.6389&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: 1 uninjured - Status: Completed, report February 4, 2014 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 88067 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR13CA413 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/88067/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=88067 - Page: https://openairdocs.org/ntsb/WPR13CA413 ## Probable cause The pilot's inadvertent action of retracting the landing gear instead of the flaps during the landing roll, which resulted in the right main landing gear collapsing. ## 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 · Unintentional use/operation (probable cause); cases with it: [Cessna T310R, 3 cases](https://openairdocs.org/ntsb-findings/01023230/cases.md?model=2074246), [All aircraft, 416 cases](https://openairdocs.org/ntsb-findings/01023230/cases.md) - [Attention/monitoring: task monitoring/vigilance](https://openairdocs.org/ntsb-findings/02021520): Personnel issues › Psychological · Pilot (probable cause); cases with it: [Cessna T310R, 2 cases](https://openairdocs.org/ntsb-findings/02021520/cases.md?model=2074246), [All aircraft, 330 cases](https://openairdocs.org/ntsb-findings/02021520/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 T310R, 3 cases](https://openairdocs.org/ntsb-events/094/sequence.md?model=2074246), [All aircraft, 1,787 cases](https://openairdocs.org/ntsb-events/094/sequence.md) - [Landing-landing roll: Runway excursion](https://openairdocs.org/ntsb-events/300); cases with it: [Cessna T310R, 2 cases](https://openairdocs.org/ntsb-events/300/sequence.md?model=2074246), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md) ## Analysis The pilot reported that during the landing roll of his second uneventful landing, the right main landing gear started to shimmy. He slowed the airplane and proceeded towards the nearest taxiway. Before exiting the runway, the pilot went to retract the flaps when he inadvertently raised the landing gear handle. He quickly re-lowered the landing gear handle; however, the right main landing gear had already started to retract. The airplane veered to the right, exited the runway surface, and came to rest on the grass. The airplane's right wing was substantially damaged. The pilot reported no preimpact mechanical failures or malfunctions with the airframe or engine that would have precluded normal operation. ## Factual narrative The pilot reported that during the landing roll of his second uneventful landing, the right main landing gear started to shimmy. He slowed the airplane and proceeded towards the nearest taxiway. Before exiting the runway, the pilot went to retract the flaps when he inadvertently raised the landing gear handle. He quickly re-lowered the landing gear handle; however, the right main landing gear had already started to retract. The airplane veered to the right, exited the runway surface, and came to rest on the grass. The airplane's right wing was substantially damaged. The pilot reported no preimpact mechanical failures or malfunctions with the airframe or engine that would have precluded normal operation. ## Aircraft - Registration: [N712SB](https://openairdocs.org/aircraft/N712SB), registered now, S/N 310R0122, built 1975 (OpenAirDocs) - Reported make and model: CESSNA T310R - Registry model: [Cessna T310R](https://openairdocs.org/model/cessna-t310r) (registry code 2074246) (OpenAirDocs) - Registry engine: [Continental TSIO-520 series](https://openairdocs.org/engine/continental-tsio-520-series) (registry code 17040, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 310R0122 - Year built: 1975 - Airframe hours: 4795 - Engines: Continental TSIO-520 SERI 300 horsepower reciprocating; Continental TSIO-520 SERI 300 horsepower reciprocating - Damage: Substantial damage - Fire: Unknown - Flight: Personal, Part 91 - Operator: Singer Nathan - Registered owner: Singer Nathan - Airworthiness certificate: Standard, Normal - Last inspection: Annual, October 1, 2012, 38 hours before - Departed: SBP, San Luis Obispo, CA - Destination: SBP, San Luis Obispo, CA - Airport: SBP, San Luis County Rgnl, runway 29, 6,100 × 50 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 59; injuries: none; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review August 24, 2013; seat: left; restraint: 3-point; flight hours: 2,495 total, 760 in this make and model, 2,389 as pilot in command, 7 in the last 90 days, 6 in the last 30 days, 0 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: variable at 6 knots, gusting 16 - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 59 °F, dew point 54 °F - Altimeter: 29.72 inHg - Observed at: SBP ## 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 20130915022589A](https://openairdocs.org/incident/20130915022589A), Sep 15, 2013: Cessna T310R, San Luis Obispo, CA, Substantial damage. On September 15, 2013, at approximately 1951 hours pacific time, a Cessna T310R model aircraft, N712SB, sustained substantial damage following a right main… ## Docket (1 files) The files NTSB released with the investigation on January 9, 2014, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=88067. 625 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 625 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40406929&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-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.