# NTSB SEA95LA204: Stinson 108-1, N8865K, Corvallis, OR, September 4, 1995 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: September 4, 1995, 12:05 local (19:05 UTC) - Place: Corvallis, OR - Coordinates: 44.460475, -123.34011 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=44.4605&lon=-123.3401&mi=10 - Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 3 uninjured - Status: Completed, report February 14, 1996 - Report: Approved by Office Director - NTSB case key (mKey): 42240 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA95LA204 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/42240/pdf - Page: https://openairdocs.org/ntsb/SEA95LA204 ## Probable cause SHEARING OF THE RIGHT MAIN LANDING GEAR SHOCK STRUT RETAINER CAP RETAINING PINS. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Main gear collapsed, landing - roll - landing gear,main gear shock absorbing strut - separation (cause) - miscellaneous,dowel/pin - sheared (cause) ## Analysis AFTER DEPARTING RUNWAY 17 THE PILOT REMAINED IN THE PATTERN FOR A TOUCH-AND-GO. UPON TOUCHDOWN AT 70 MPH, ON CENTERLINE, THE RIGHT MAIN LANDING GEAR COLLAPSED. POSTCRASH EXAMINATION REVEALED THAT THE FOUR RETAINING PINS WHICH HOLD THE RIGHT MAIN LANDING GEAR SHOCK STRUT RETAINER CAP HAD SHEARED ALLOWING THE STRUT TO SEPARATE FROM THE GEAR STRUT. NO PRE-EXISTING FATIGUE WAS OBSERVED ON THE PINS. THE AIRCRAFT HAD BEEN GROUND-LOOPED 14.3 HOURS PREVIOUS TO THIS ACCIDENT. ## Factual narrative On September 4, 1995, approximately 1205 hours Pacific daylight time, a Stinson 108-1, N8865K, sustained substantial damage when the right main landing gear collapsed during the landing roll on runway 17 at the Corvallis Municipal Airport, Corvallis, Oregon. The private pilot and two passengers were uninjured. Visual meteorological conditions existed and no flight had been filed. The flight, which was personal and local, was to have been operated under 14CFR91, and originated from Corvallis approxi- mately 15 minutes earlier. The pilot reported that he departed runway 17 at Corvallis and remained in the pattern with the intent of conducting a single touch-and-go landing on the same runway before departing the airport. He indicated that he flew a normal 70 mph approach and touched down on the "centerline on (the) 1000 foot square (runway fixed distance markings) (and) began (a) slight (10 degree) drift to l(eft)." He reported that the "plane responded poorly" and that the "plane lifted (the) left wing (or lowered the right wing) as (the) gear leg with (the) piston from (the) oleo lifted (the) right seat from (its) track" (refer to attached NTSB Form 6120.1/2). The pilot also reported in a separate NASA ASRS report that inspection of the runway revealed "rubber marks from (the) wheel up the runway suggesting that the right tire was scuffing and perhaps turned inward from at or very near (the) touchdown" (refer to photograph 1). Post crash examination revealed that the four retaining pins for the right main landing gear's shock strut retainer (cap) had sheared (refer to photograph 2). Gross examination of the pins revealed no evidence of fatigue. The pilot reported to an FAA inspector that he had purchased the aircraft one week previous to the accident and that a total of 14.3 hours had been logged in the previous year since the time the aircraft had been previously ground looped. ## Aircraft - Registration: [N8865K](https://openairdocs.org/deregistered/N8865K-2001-02-12), registration cancelled 2001-02-12, S/N 108-1865 (OpenAirDocs) - Reported make and model: STINSON 108-1 - Registry model: [Stinson 108](https://openairdocs.org/model/stinson-108) (registry code 9230402) (OpenAirDocs) - Category: Airplane - Serial number: 108-1865 - Airframe hours: 1294 - Engines: FRANKLIN 6A4-165-BC 165 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Taylor, William, M. - Airworthiness certificate: Standard, Utility - Last inspection: Annual, August 23, 1995, 5 hours before - Departed: CVO - Airport: CVO, Corvallis Municipal, runway 17, 5,065 × 150 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 62; private; airplane ratings: single-engine land; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 1,212 total, 5 in this make and model, 1,045 as pilot in command, 46 in the last 90 days, 8 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 100° at 3 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 72 °F, dew point 50 °F - Altimeter: 30.00 inHg - Observed at: CVO ## 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 19950904027899A](https://openairdocs.org/incident/19950904027899A), Sep 4, 1995: Univar 1081, Corvallis, OR, Substantial damage. Right wing lowered on landing. Right main gear collapsed. Shock struct cap had sheared. Prior ground loop history. ## Other investigations on N8865K (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 SEA00LA111](https://openairdocs.org/ntsb/SEA00LA111), Jun 21, 2000: Stinson 108-1 (N8865K), Mountain Home, ID, substantial damage. Probable cause: The pilot's decision to takeoff in unfavorable weather conditions without first calculating takeoff performance data. Factors include gusty winds, downdrafts, terrain-induced turbulence, and… 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.