# NTSB CEN10LA564: Cessna 310K, N550JW, Boerne Stage, TX, September 26, 2010 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: September 26, 2010, 15:50 local (20:50 UTC) - Place: Boerne Stage, TX - Coordinates: 29.723611, -98.694725 - Nearby events: https://openairdocs.org/map.md?lat=29.7236&lon=-98.6947&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing: Landing gear not configured](https://openairdocs.org/ntsb-events/095) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed, report May 19, 2011 - Report: Approved by Office Director - NTSB office: Central Region - Parties: FAA Flight Standards District Office - NTSB case key (mKey): 77417 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN10LA564 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/77417/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=77417 - Page: https://openairdocs.org/ntsb/CEN10LA564 ## Probable cause The pilot’s failure to ensure that the landing gear was extended prior to landing, resulting in a landing on the partially extended landing gear. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Landing gear system: landing gear selector](https://openairdocs.org/ntsb-findings/01023234): Aircraft › Aircraft systems · Incorrect use/operation (probable cause); cases with it: [Cessna 310K, 1 case](https://openairdocs.org/ntsb-findings/01023234/cases.md?model=2074228), [All aircraft, 54 cases](https://openairdocs.org/ntsb-findings/01023234/cases.md) - [Action: incomplete action](https://openairdocs.org/ntsb-findings/02041040): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [Cessna 310K, 1 case](https://openairdocs.org/ntsb-findings/02041040/cases.md?model=2074228), [All aircraft, 105 cases](https://openairdocs.org/ntsb-findings/02041040/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Landing: Landing gear not configured](https://openairdocs.org/ntsb-events/095) (defining event); cases with it: [Cessna 310K, 1 case](https://openairdocs.org/ntsb-events/095/sequence.md?model=2074228), [All aircraft, 584 cases](https://openairdocs.org/ntsb-events/095/sequence.md) ## Analysis The pilot stated that he used the checklist and placed the landing gear handle in the “down” position, but did not check the annunciator lights. During landing, the gear collapsed. Postaccident examination of the airplane revealed that the landing gear circuit breaker had opened. Runway scrapes showed all three gears were partially extended when the airplane touched down, indicative that the gear extension was in progress when the wheels touched the runway. The airplane was placed on jacks and the nose gear was pulled down by hand where it locked into position. The right main landing gear was also pulled down by hand and it locked in position. The left main landing gear could not be extended due to spar damage, but testing of the squat switch revealed no anomalies. ## Factual narrative On September 27, 2010, approximately 1550 central daylight time, a Cessna 310K, N550JW, registered to and operated by Urban Air, LLC, and piloted by an airline transport certificated pilot, was substantially damaged when it landed wheels up at Boerne Stage Field (5C1) Boerne Stage, Texas. Visual meteorological conditions (VMC) prevailed at the time of the accident. The personal flight was being conducted under the provisions of 14 Code of Federal Regulations (CFR) Part 91 without a flight plan. The pilot and passenger on board the airplane were not injured. The cross-country flight originated at La Porte Municipal Airport (T41), La Porte, Texas, approximately 1500, and was en route to Boerne Stage. The pilot was asked to complete and return NTSB Form 6120.1-2, Pilot-Operator Aircraft Accident Report. He never did. The following is based on what was reported by the Federal Aviation Administration (FAA) inspector who went to the accident site: The pilot said he used the checklist and placed the landing gear handle in the DOWN position, but he admitted he did not check the annunciator lights. He said the gear collapsed on landing. An FAA inspector examined the airplane and found the landing gear circuit breaker had opened. Runway scrapes indicated all three gears were partially extended. The airplane was placed on jacks, and the nose gear was pulled down by hand and it locked in position. The right main landing gear was also pulled down by hand and it locked in position. The left main landing gear could not be extended due to spar damage, but the squat switch tested normal. ## Aircraft - Registration: [N550JW](https://openairdocs.org/deregistered/N550JW-2012-09-10), registration cancelled 2012-09-10, S/N 310K0050, built 1966 (OpenAirDocs) - Reported make and model: CESSNA 310K - Registry model: [Cessna 310K](https://openairdocs.org/model/cessna-310k) (registry code 2074228) (OpenAirDocs) - Registry engine: [Continental I0-470 series](https://openairdocs.org/engine/continental-i0-470-series) (registry code 17027, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 310K0050 - Engines: Continental IO-470-V 260 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Urban Air LLC - Registered owner: Urban Air LLC - Airworthiness certificate: Standard, Normal - Departed: T41, La Porte, TX - Destination: 5C1, Boerne Stage, TX - Airport: 5C1, Boerne Stage Field, runway 17, 3,940 × 36 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; injuries: none; commercial, airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; seat: left ## Weather - Conditions: Visual (VMC), Day - Wind: 20° at 7 knots - Visibility: 10 statute miles - Lowest ceiling: 25,000 ft overcast - Temperature: 84 °F, dew point 63 °F - Altimeter: 29.92 inHg - Observed at: SAT ## 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 20100926047739A](https://openairdocs.org/incident/20100926047739A), Sep 26, 2010: Cessna 310K, San Antonio, TX, Substantial damage. The aircraft landed with the main gear and nose gear partially extended and not in the fully down and locked position. The pilot stated he used a checklist… ## Docket (2 files) The files NTSB released with the investigation on March 9, 2011, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=77417. 86 KB in all. - Memorandum (item 1, .PDF, 46 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40342011&FileExtension=.PDF&FileName=Memorandum-Master.PDF - Weather Reports and Records (item 2, .PDF, 40 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40341830&FileExtension=.PDF&FileName=Weather%20Reports%20and%20Records-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.