# NTSB WPR11LA049: Mooney M20B, Marana, AZ, November 11, 2010 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: November 11, 2010, 10:35 local (17:35 UTC) - Place: Marana, AZ - Coordinates: 32.409442, -111.21833 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=32.4094&lon=-111.2183&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 February 16, 2012 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration FSDO - NTSB case key (mKey): 77821 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR11LA049 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/77821/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=77821 - Page: https://openairdocs.org/ntsb/WPR11LA049 ## Probable cause The pilot did not secure the manual landing gear operating handle, which resulted in the landing gear collapse during the landing roll. ## 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 · Incorrect use/operation (probable cause); cases with it: [All aircraft, 416 cases](https://openairdocs.org/ntsb-findings/01023230/cases.md) - [Action: incorrect action performance](https://openairdocs.org/ntsb-findings/02041015): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [All aircraft, 1,386 cases](https://openairdocs.org/ntsb-findings/02041015/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: [All aircraft, 1,787 cases](https://openairdocs.org/ntsb-events/094/sequence.md) ## Analysis The pilot said that he completed the landing checklist, which included putting the landing gear down, while on the downwind leg for landing and that he made a final check of the landing gear handle, mixture, and propeller controls while on final approach. The approach and touchdown were normal, but, during the landing roll, the airplane came to a sudden stop on its belly. Postaccident examination revealed that the Johnson bar operating handle for the manual landing gear system was not in the fully locked position. Therefore, the landing gear was down but not locked into position during touchdown, and it subsequently collapsed during the landing roll. ## Factual narrative On November 11, 2010, about 1035 mountain standard time, a Mooney M20B, Canadian registration C-GFRP, had the landing gear collapse during landing at Marana Regional Airport, Marana, Arizona. The pilot/owner was operating the airplane under the provisions of 14 Code of Federal Regulations (CFR) Part 91. The private pilot (Canadian certificate) and one passenger were not injured. The airplane sustained substantial damage to several fuselage bulkheads during the accident sequence. The cross-country personal flight departed Phoenix Regional Airport, Maricopa, Arizona, about 0915, with a planned destination of Marana Regional Airport. Visual meteorological conditions prevailed, and no flight plan had been filed. The pilot reported that he completed the landing checklist while on the downwind leg. The landing gear was down, flaps were deployed, and he was maintaining an approach speed of 80 miles per hour for the base leg and final approach. The pilot stated that while on final approach he checked the gear lever, mixture, and propeller controls. He indicated that the approach and touchdown were normal. After touchdown, the airplane came to a sudden stop. He made a radio call announcing his position on the runway, and his situation. He turned the magnetos and master switch off prior to exiting the airplane. The airplane was sitting on the centerline for runway 12 with no landing gear visible. A Federal Aviation Administration inspector examined the airplane. He stated that it was equipped with the manual gear system utilizing the Johnson bar operating handle. He determined during the examination that the handle was not in the fully locked position. Therefore, the landing gear was down, but not locked into position. Upon landing rollout, the gear collapsed back into their normal retracted position. When the landing gear retracted, the airplane dropped to the ground and skidded on the belly of the fuselage. ## Aircraft - Registration: C-GFRP (not matched to a registry record) - Reported make and model: MOONEY M20B - Category: Airplane - Serial number: 1798 - Airframe hours: 3191 - Engines: Lycoming O-360-A1D 180 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Terence Lumb - Registered owner: Terence Lumb - Airworthiness certificate: Standard, Normal - Last inspection: 100 hour, May 10, 2010 - Departed: A39, Maricopa, AZ - Destination: AVQ, Marana, AZ - Airport: AVQ, Marana Regional Airport, runway 12, 6,901 × 100 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 64; injuries: none; private; airplane ratings: single-engine land; medical: class 3, with waivers/limitations; last flight review May 16, 2010; seat: left; flight hours: 911 total, 56 in this make and model, 858 as pilot in command, 30 in the last 90 days, 17 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 57 °F, dew point 18 °F - Altimeter: 30.09 inHg - Observed at: KRYN ## Docket (2 files) The files NTSB released with the investigation on December 19, 2011, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=77821. 478 KB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 423 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40341241&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - FAA Record of Conversation (item 2, .PDF, 56 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40359340&FileExtension=.PDF&FileName=FAA%20Record%20of%20Conversation-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.