# NTSB CHI03LA322: Stinson 108-3, N6624M, Lincoln, NE, September 27, 2003 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: September 27, 2003, 15:30 local (20:30 UTC) - Place: Lincoln, NE - Coordinates: 41.449165, -96.520278 - Nearby events: https://openairdocs.org/map.md?lat=41.4492&lon=-96.5203&mi=10 - Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping) - Highest injury: Minor injuries - Injuries: 1 minor - Status: Completed, report June 2, 2004 - Report: Approved by Office Director - Parties: FAA- Lincoln FSDO - NTSB case key (mKey): 58015 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI03LA322 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/58015/pdf - Page: https://openairdocs.org/ntsb/CHI03LA322 ## Probable cause The total loss of engine power due to the fatigue fracture of the engine accessory gear drive. A factor was the concrete marker. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, cruise - engine assembly,gear - fatigue (cause) - engine assembly,gear - failure,total (cause) - Forced landing, emergency descent/landing - On ground/water collision with object, landing - roll - object - sign (contributing factor) - Nose over, landing - roll ## Analysis The airplane sustained substantial damage during a forced landing. The pilot reported that the engine failed at 3,000 feet mean sea level during cruise flight. While on his landing roll on a sod field, the airplane struck a concrete marker and the airplane nosed over. The inspection of the airplane revealed the accessory gear drive was fractured in two pieces and had become dislodged from the crankshaft. A metallurgical examination of the accessory gear drive revealed a fatigue fracture at the key way. ## Factual narrative On September 27, 2003, at 1530 central daylight time, a Stinson 108-3, N6624M, piloted by a commercial pilot, sustained substantial damage when it lost engine power and nosed over while attempting to land in a field 6 nautical miles north-northeast of Lincoln Municipal Airport (LNK), Lincoln, Nebraska. Visual meteorological conditions prevailed at the time of the accident. The flight was operating under the provisions of 14 CFR Part 91 without a flight plan. The pilot sustained minor injuries. The flight departed the Fremont Municipal Airport (FET), Fremont, Nebraska, at 1510. The pilot reported that the engine failed while in cruise flight at 3,000 feet mean sea level. The engine could not be restarted, and a forced landing was made to a sod field. During the landing roll, the airplane struck a concrete marker and nosed over. A Federal Aviation Administration (FAA) airworthiness inspector examined the airplane. The exam revealed that the accessory gear drive was fractured in two pieces, and had become dislodged from the crankshaft. He reported, "a corrosion spot was observed protruding off of the keyway propagating towards the outside of the gear." Metal shavings were found in the accessory area and in the oil reservoir. The accessory gear drive was inspected by Engineering Systems Inc., (ESI), Aurora, Illinois, on January 13, 2004. The inspection revealed that a fatigue fracture had initiated at the key way that held the gear on the rotating shaft. ## Aircraft - Registration: [N6624M](https://openairdocs.org/deregistered/N6624M-2013-04-30), registration cancelled 2013-04-30, S/N 108-4624, built 1948 (OpenAirDocs) - Reported make and model: Stinson 108-3 - Registry model: [Stinson 108-3](https://openairdocs.org/model/stinson-108-3) (registry code 9230408) (OpenAirDocs) - Registry engine: [Franklin 6A4165 series](https://openairdocs.org/engine/franklin-6a4165-series) (registry code 27025, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 108-4624 - Airframe hours: 2137 - Engines: Franklin 6A4-165-B3 165 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Operator: Steven P Becker - Registered owner: Steven Becker - Airworthiness certificate: Standard, Normal - Last inspection: Annual, October 19, 2002, 20 hours before - Departed: FET, Fremont, NE - Destination: LNK, Lincoln, NE ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 53; injuries: minor; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; last flight review March 28, 2003; seat: left; flight hours: 2,600 total, 695 in this make and model, 2,440 as pilot in command ## Weather - Conditions: Visual (VMC), Day - Wind: 330° at 23 knots, gusting 29 - Visibility: 10 statute miles - Lowest ceiling: 7,000 ft broken - Temperature: 64 °F, dew point 30 °F - Altimeter: 30.01 inHg - Observed at: LNK, 6 nm away ## 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 20030927024739A](https://openairdocs.org/incident/20030927024739A), Sep 27, 2003: Univar 1083, Lincoln, NE, Substantial damage. (-23) Pilot was flying at 3000' MSL when he experienced a complete engine failure. At the time of the engine failure the winds were 330 @ 23 knots gusting to… 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.