# NTSB WPR14LA142: Bellanca 17 31, N28119, Salt Lake City, UT, March 21, 2014 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: March 20, 2014, 20:45 local (Mar 21, 2014, 02:45 UTC) - Place: Salt Lake City, UT - Coordinates: 40.776943, -111.962219 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=40.7769&lon=-111.9622&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 May 13, 2015 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 88947 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR14LA142 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/88947/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=88947 - Page: https://openairdocs.org/ntsb/WPR14LA142 ## Probable cause The failure of the right main landing gear extension spring to maintain adequate pressure, which allowed the landing gear to collapse during the landing roll. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Landing gear system: main landing gear](https://openairdocs.org/ntsb-findings/01023210): Aircraft › Aircraft systems · Failure (probable cause); cases with it: [Bellanca 17-31ATC, 1 case](https://openairdocs.org/ntsb-findings/01023210/cases.md?model=1220437), [All aircraft, 241 cases](https://openairdocs.org/ntsb-findings/01023210/cases.md) - [Landing gear system: gear extension and retract sys](https://openairdocs.org/ntsb-findings/01023230): Aircraft › Aircraft systems · Malfunction (probable cause); cases with it: [Bellanca 17-31ATC, 2 cases](https://openairdocs.org/ntsb-findings/01023230/cases.md?model=1220437), [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. - [Landing-landing roll: Landing gear collapse](https://openairdocs.org/ntsb-events/094) (defining event); cases with it: [Bellanca 17-31ATC, 2 cases](https://openairdocs.org/ntsb-events/094/sequence.md?model=1220437), [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: [Bellanca 17-31ATC, 2 cases](https://openairdocs.org/ntsb-events/300/sequence.md?model=1220437), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md) - [Landing-landing roll: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Bellanca 17-31ATC, 3 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=1220437), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The pilot reported that, during the approach, he conducted his usual prelanding checklist, which included verifying the landing gear position and indicator lights four separate times. He conducted an uneventful touchdown; however, during the landing roll, the right main landing gear collapsed. Postaccident examination of the landing gear revealed that the right main landing gear extension spring appeared to be compressed, and, when tested, it only produced 19 to 20 pounds of pressure. It is likely that this reduced pressure was not sufficient to maintain the extension of the right main landing gear. The nose and left main landing gear extension springs were also tested, and they produced about 40 pounds of pressure. The pilot reported that three new springs, all of which produced 44 pounds of pressure, were subsequently installed on the airplane, and no further landing gear system anomalies were reported after flight testing. ## Factual narrative On March 20, 2014 about 2045 mountain daylight time, a Bellanca 17-31ATC, N28119, sustained substantial damage after the landing gear collapsed at the Salt Lake City International Airport (SLC), Salt Lake City, Utah. The pilot, the sole occupant, was not injured; the airplane sustained substantial damage to the right wing aileron. The airplane was registered to, and operated by, the pilot under the provision of 14 Code of Federal Regulations Part 91 as a personal flight. Visual meteorological conditions prevailed for the flight, and no flight plan was filed. The flight originated from the Roosevelt Municipal Airport (74V), Roosevelt, Utah at about 1950. The pilot reported that during the approach he conducted his usual pre-landing checklist, which included verifying the landing gear position and indicator lights four separate times. He conducted a normal, uneventful landing. During the landing roll the landing gear warning indication light activated and the right main landing gear green indicator light extinguished. The right wing dropped to the runway and the airplane slid before coming to a rest just off of the runway surface. Postaccident examination of the landing gear by a mechanic and the pilot revealed that the right main landing gear extension spring appeared to be compressed; when tested, it produced 19-20 pounds of pressure. The extension springs from the nose and left landing gear assemblies were also removed and tested; they both produced about 40 pounds of pressure. The pilot reported that he subsequently purchased and tested three new springs, all of which produced about 44 pounds of pressure. The new springs were installed on the airplane and no further landing gear anomalies were noted. ## Aircraft - Registration: [N28119](https://openairdocs.org/aircraft/N28119), registered now, S/N 78-31146, built 1978 (OpenAirDocs) - Reported make and model: BELLANCA 17 31 (ATC) - Registry model: [Bellanca 17-31ATC](https://openairdocs.org/model/bellanca-17-31atc) (registry code 1220437) (OpenAirDocs) - Registry engine: [Lycoming TI0-540 series](https://openairdocs.org/engine/lycoming-ti0-540-series) (registry code 41533, turbo-prop) (OpenAirDocs) - Category: Airplane - Serial number: 78-31146 - Year built: 1978 - Airframe hours: 2342 - Engines: LYCOMING IO-540 SER 300 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Gregory G Page Dds Pc - Registered owner: Gregory G Page Dds Pc - Airworthiness certificate: Standard, Normal - Last inspection: Annual, March 14, 2014, 1 hours before - Departed: 74V, Roosevelt, UT - Destination: SLC, Salt Lake City, UT - Airport: SLC, Salt Lake City Intl Airport, runway 35, 9,596 × 150 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 60; injuries: none; commercial; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review June 7, 2013; seat: left; restraint: 3-point; flight hours: 2,062 total, 842 in this make and model, 2,062 as pilot in command, 2 in the last 90 days, 2 in the last 30 days ## Weather - Conditions: Visual (VMC), Dusk - Wind: 150° at 3 knots - Visibility: 10 statute miles - Lowest ceiling: 22,000 ft broken - Temperature: 61 °F, dew point 12 °F - Altimeter: 29.93 inHg - Observed at: SLC ## 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 20140320002749A](https://openairdocs.org/incident/20140320002749A), Mar 20, 2014: Bellanca 17-31ATC, Salt Lake City, UT, Substantial damage. The aircraft departed roosvelt ut. Arriving at slc the aircraft was cleared to land on runway 35. The landing was normal on the roll out the aircraft had… ## Docket (3 files) The files NTSB released with the investigation on April 16, 2015, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=88947. 1.4 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 1.3 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40425147&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - Record of Conversation - Pilot (item 2, .PDF, 57 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40425148&FileExtension=.PDF&FileName=Record%20of%20Conversation%20-%20Pilot-Master.PDF - Bellanca Viking Service Manual Excerpt - Extension Spring Assembly Diagram (item 3, .PDF, 39 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40425149&FileExtension=.PDF&FileName=Bellanca%20Viking%20Service%20Manual%20Excerpt%20-%20Extension%20Spring%20Assembly%20Diagram-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.