# NTSB SEA03LA133: Cessna 402 B, N98635, Lakeview, OR, July 8, 2003 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: July 7, 2003, 17:35 local (Jul 8, 2003, 00:35 UTC) - Place: Lakeview, OR - Coordinates: 42.161109, -120.398887 - Nearby events: https://openairdocs.org/map.md?lat=42.1611&lon=-120.3989&mi=10 - Phase of flight: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report March 30, 2004 - Report: Approved by Office Director - Parties: FAA FSDO - NTSB case key (mKey): 57467 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA03LA133 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/57467/pdf - Page: https://openairdocs.org/ntsb/SEA03LA133 ## Probable cause Failure of the landing gear shaft roll pin resulting in a main gear collapse during the taxi phase of operation. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Main gear collapsed, taxi - to takeoff - landing gear,main gear - collapsed (cause) - miscellaneous,dowel/pin - failure (cause) ## Analysis The airline transport pilot reported that the airplane's left main landing gear assembly collapsed while taxiing the airplane from the ramp to the active runway. Postaccident examination of the landing gear assembly revealed that the roll pin (part number NAS 561P4) that retains the attaching shaft (part number 0841011-1) to the trunnion assembly was fractured. This allowed the landing gear attaching shaft to shift from its installed position, resulting in the trunnion assembly separating from the landing gear support structure. Following the inspection of the failed landing gear, the operator inspected the landing gear of its remaining Cessna 402's, six in total. Subsequent to the inspections, the operator reported that they identified two aircraft with broken landing gear shaft roll pins. The roll pins were replaced, and the operator reported that the landing gear assemblies would be reexamined in six-month intervals. ## Factual narrative On July 7, 2003, about 1735 Pacific daylight time, a Cessna 402 B, N98635, sustained substantial damage to the left wing assembly following a main gear collapse at the Lake County Airport, Lakeview, Oregon. The airplane is owned and operated by Ameriflight, Inc., Burbank, California, and was being operated as a domestic cargo flight under the provisions of Title 14, CFR 135, when the accident occurred. The airline transport pilot was the sole occupant of the airplane and was not injured. Visual meteorological conditions prevailed and a company flight plan had been activated. During a telephone conversation with the NTSB IIC on July 7, the pilot reported that the airplane's left main landing gear assembly collapsed while taxiing the airplane from the ramp to runway 16. FAA inspectors from the Hillsboro, Oregon, Flight Standards District Office (FSDO) and representatives from the operator examined the airplane's left main landing gear assembly following the accident. The examination revealed that the roll pin (part number NAS 561P4) that retains the attaching shaft (part number 0841011-1) to the trunnion assembly was fractured. This allowed the landing gear attaching shaft to shift from its installed position, resulting in the trunnion assembly separating from the landing gear support structure. Refer to the attached landing gear diagram for further information. Following the inspection of the failed landing gear, the operator inspected the landing gear of its remaining Cessna 402's, six in total. Subsequent to the inspections, the operator reported that they identified two aircraft with broken landing gear shaft roll pins. The roll pins were replaced, and the operator reported that the landing gear assemblies would be reexamined in six-month intervals. ## Aircraft - Registration: [N98635](https://openairdocs.org/deregistered/N98635-2007-04-13), registration cancelled 2007-04-13, S/N 402B1024, built 1975 (OpenAirDocs) - Reported make and model: Cessna 402 B - Registry model: [Cessna 402B](https://openairdocs.org/model/cessna-402b) (registry code 207590P) (OpenAirDocs) - Registry engine: [Continental TSIO-520 series](https://openairdocs.org/engine/continental-tsio-520-series) (registry code 17040, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 402B1024 - Airframe hours: 10606 - Engines: Teledyne Continental TSIO-520-E 300 horsepower reciprocating; Teledyne Continental TSIO-520-E 300 horsepower reciprocating - Damage: Substantial damage - Flight: Part 135 - Operator: Ameriflight Inc, doing business as Ameriflight - Registered owner: Ameriflight - Airworthiness certificate: Standard, Normal - Last inspection: AAIP, May 22, 2003, 52 hours before - Departed: LKV, Lakeview, OR - Destination: LMT, KLAMATH FALLS, OR - Flight plan: Company VFR - Airport: LKV, Lake County, runway 16, 5,306 × 100 ft, asphalt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 47; injuries: none; airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, with waivers/limitations; last flight review March 21, 2003; seat: left; flight hours: 7,696 total, 3,576 in this make and model, 7,471 as pilot in command, 32 in the last 90 days, 16 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 260° at 15 knots, gusting 25 - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 79 °F, dew point 36 °F - Altimeter: 29.92 inHg - Observed at: KLVK ## 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 20030707012739A](https://openairdocs.org/incident/20030707012739A), Jul 7, 2003: Cessna 402B, Lakeview, OR, Substantial damage. (-23) Michael williamson, pilot of N98635, operated a Cessna 402B on a cargo flight. The aircraft had been loaded and taxied for departure on runway 16 at… 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.