# NTSB WPR22LA047: Cessna R182, N7592Y, Puyallup, WA, November 22, 2021 - Type: NTSB accident investigation - Classification: Accident · No injuries · Class 3 · Limited · Final report - Date: November 22, 2021, 13:49 local (21:49 UTC) - Place: Puyallup, WA · Airport - Coordinates: 47.10392, -122.2872 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=47.1039&lon=-122.2872&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Defining event: [Landing: Landing gear collapse](https://openairdocs.org/ntsb-events/094) - Highest injury: No injuries - Injuries: 2 uninjured - Status: Completed - Report: Approved by Office Director - Investigation class: Class 3 - NTSB office: Western Pacific Region - Parties: FAA - NTSB case key (mKey): 104302 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR22LA047 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/104302/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=104302 - Page: https://openairdocs.org/ntsb/WPR22LA047 ## Probable cause An overstress fracture of the left main landing gear pivot assembly, which resulted in the failure of the left main landing gear to fully extend and lock into place. ## 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) ## Analysis During an instructional flight, the pilot receiving instruction performed an emergency landing gear extension; however, the left main gear did not extend despite multiple attempts, and the instructor chose to land with the gear retracted, resulting in substantial damage to the fuselage. Examination revealed that the left main landing gear pivot assembly shaft had fracture-separated near the pivot housing. Metallurgical examination of the fracture surfaces revealed signatures of overstress. The overstress fracture of the pivot assembly resulted in the failure of the left landing gear to fully extend. ## Factual narrative On November 22, 2021, about 1349 Pacific standard time, a Cessna R182, N7592Y, was substantially damaged when it was involved in an accident near Puyallup, Washington. The flight instructor and private pilot receiving instruction were not injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 instructional flight. The instructor reported that the intent of the flight was to conduct a stage check for the pilot receiving instruction, who was preparing for an upcoming practical test. They completed several maneuvers in the practice area and were returning to the airport when the instructor requested that the pilot perform a simulated emergency landing gear extension. The pilot noticed that the left main landing gear did not extend. Despite multiple attempts to cycle the landing gear, which included utilizing the emergency landing gear extension procedures, they were unable to extend the left main landing gear. The instructor took control of the airplane and chose to land the airplane with the landing gear retracted. Postaccident examination of the airplane revealed that the fuselage was substantially damaged. A subsequent examination of the airplane revealed the left main landing gear pivot assembly shaft had fracture-separated near the pivot housing, which prevented the left main landing gear from extending or retracting. The left landing gear pivot assembly was sent to National Transportation Safety Board Materials Laboratory, Washington, DC, for examination, which revealed characteristics consistent with a shear overstress fracture in clockwise torsion. A review of the airplane’s maintenance records could not determine the age of the component, or if any maintenance had been performed on the assembly. The operator reported that the accident airplane had always been flown with a flight instructor or examiner on board and no hard landings were reported or documented before the accident flight. ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Landing: Landing gear collapse](https://openairdocs.org/ntsb-events/094) (defining event) ## Aircraft - Registration: [N7592Y](https://openairdocs.org/aircraft/N7592Y), registered now, S/N R18200141, built 1977 (OpenAirDocs) - Reported make and model: CESSNA R182 - Registry model: [Cessna R182](https://openairdocs.org/model/cessna-r182) (registry code 2072734) (OpenAirDocs) - Registry engine: [Lycoming 0-540 series](https://openairdocs.org/engine/lycoming-0-540-series) (registry code 41532, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: R18200141 - Year built: 1977 - Airframe hours: 3681.1 - Engines: LYCOMING O-540-J3C5D 235 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Operator: Clover Park Technical College - Registered owner: Clover Park Technical College - Airworthiness certificate: Standard, Normal - Last inspection: Annual, May 11, 2021, 75.6 hours before - Destination: Same as departure - Airport: PLU, Pierce County - Thun Fld, runway 35, 3,651 × 60 ft, asphalt - Equipment: Stall warning system, ADS-B ## Flight crew As NTSB recorded them. NTSB leaves out names. - Flight instructor; age 41; injuries: none; airline transport, flight instructor; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, without waivers/limitations; last flight review January 30, 2021; seat: right; restraint: 4-point; flight hours: 5,010.5 total, 212 in this make and model, 3,788.2 as pilot in command, 72 in the last 90 days, 22.4 in the last 30 days, 1.5 in the last 24 hours - Student pilot; age 22; injuries: none; private; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 1, without waivers/limitations; last flight review April 23, 2021; seat: left; restraint: 4-point; flight hours: 254 total, 8.3 in this make and model, 200 as pilot in command, 31 in the last 90 days, 7.7 in the last 30 days, 1.5 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 statute miles - Lowest ceiling: 5,000 ft broken - Temperature: 46 °F, dew point 39 °F - Altimeter: 30.04 inHg - Observed at: KPLU - METAR: KPLU 222155Z AUTO 00000KT 10SM FEW043 BKN050 OVC055 08/04 A3004 RMK AO2 ## 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 20211122019239A](https://openairdocs.org/incident/20211122019239A), Nov 22, 2021: Cessna R182, Puyallup, WA, Substantial damage. L MLG would not lock in the down position prior to landing. After emergency procedures were accomplished, l MLG remained hanging down in the unlocked position.… ## Other investigations on N7592Y (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 SEA02LA139](https://openairdocs.org/ntsb/SEA02LA139), Jul 30, 2002: Cessna R182 (N7592Y), Puyallup, WA, substantial damage. Probable cause: Restricted movement of the left main landing gear resulting in the gear not extending for the landing. A misaligned brake line was a factor. ## Docket (6 files) The files NTSB released with the investigation on April 26, 2023, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=104302. 7.0 MB in all. - Pilot/operator aircraft accident report, NTSB form 6120.1 (item 1, PDF, 9 pages, 1.9 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=13020482&FileExtension=pdf&FileName=WPR22LA047%206120%20CFI%20Aircraft%20Accident%20Report_Redacted-Rel.pdf - Operator e-mail (item 2, PDF, 1 page, 167 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=13212469&FileExtension=pdf&FileName=Operator%20e-mail_Redacted-Rel.pdf - Materials laboratory factual report 22-001 (item 3, PDF, 4 pages, 5 photos, 737 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=13102985&FileExtension=pdf&FileName=Materials%20Laboratory%20Factual%20Report%2022-001-Rel.pdf - Wreckage release (item 4, PDF, 1 page, 156 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=13020090&FileExtension=pdf&FileName=WPR22LA047%20signed%20wreckage%20release_Redacted-Rel.pdf - Evidence control form (item 5, PDF, 1 page, 63 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=13211509&FileExtension=pdf&FileName=Evidence-Control-Form-Pivot_Redacted-Rel.pdf - Photo array (item 6, PDF, 7 pages, 4.0 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=13188126&FileExtension=pdf&FileName=Photo%20Array-Rel.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.