# NTSB SEA98LA054: Snow 600-S2C, N1640S, Bickleton, WA, March 13, 1998 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: March 13, 1998, 10:30 local (18:30 UTC) - Place: Bickleton, WA - Coordinates: 45.919231, -120.190361 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=45.9192&lon=-120.1904&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report February 11, 2000 - Report: Approved by Office Director - NTSB case key (mKey): 42769 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA98LA054 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/42769/pdf - Page: https://openairdocs.org/ntsb/SEA98LA054 ## Probable cause The pilot's mismanagement of the fuel which led to fuel exhaustion. A related factor was unsuitable terrain. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(total) - nonmechanical, maneuvering - aerial application - fluid,fuel - exhaustion (cause) - fuel management - inadequate, pilot in command (cause) - Forced landing, emergency descent/landing - In flight collision with terrain/water, emergency landing - terrain condition - rough/uneven ## Analysis The pilot took off 50 minutes to 1 hour before the accident, and was spraying a field at the time of the accident. He reported that on the last pass, as he was pulling up, the engine lost power in a left turn. He performed a forced landing onto rough and uneven terrain; and the aircraft was substantially damaged. The aircraft salvage crew who recovered the aircraft reported that they found 3 gallons of fuel in the aircraft's left wing tank and no fuel in the right wing tank (the aircraft has a 33-gallon tank in each wing, of which 6.5 gallons in each tank is unusable.) ## Factual narrative On March 13, 1998, approximately 1030 Pacific standard time, a Snow Model 600-S2C agricultural aircraft, N1640S, operated by Bonnys Valley Air Service of Sunnyside, Washington, experienced a loss of engine power and forced landing during a 14 CFR 137 agricultural aerial application flight near Bickleton, Washington. Damage to the aircraft sustained in the forced landing was determined to be substantial, and the accident was reported to the NTSB by the FAA on March 26, 1998. The commercial pilot-in-command of the aircraft was not injured in the accident. Visual meteorological conditions prevailed and no flight plan had been filed for the flight. The pilot reported that he took off between 0930 and 0940 (50 minutes to 1 hour before the accident) with 74 gallons of fuel aboard. The pilot stated that prior to the accident, he was spraying a field approximately 3 miles southwest of Bickleton. The pilot reported: "On my last pass, after having pulled up...the [Pratt & Whitney R-1340-AN1] engine quit in a left turn. Being low on airspeed and low, I did not have much time to pick a good spot and land; the ground being uneven and rocky caused [a] pretty rough touchdown...." The pilot reported that during the landing, the left wing hit a hill and broke, and that the airplane then nosed over. According to the FAA type certificate data sheet (number 2A7) for the model 600-S2C, the aircraft's fuel capacity is 66 gallons, consisting of one 33-gallon tank in each wing, of which 53 gallons are usable. The aircraft salvage crew which recovered the accident aircraft reported to the NTSB on March 18, 1998, that at the time they recovered the aircraft, the left tank contained 3 gallons of fuel and there was no fuel in the right tank. ## Aircraft - Registration: [N1640S](https://openairdocs.org/deregistered/N1640S-2001-06-07), registration cancelled 2001-06-07, S/N 600-1189C (OpenAirDocs) - Reported make and model: Snow 600-S2C - Registry model: [Snow 600-S2C](https://openairdocs.org/model/snow-600-s2c) (registry code 8380302) (OpenAirDocs) - Category: Airplane - Serial number: 600-1189C - Airframe hours: 6996 - Engines: P&W R-1340-AN1 600 horsepower reciprocating - Damage: Destroyed - Flight: Aerial application, Part 137 - Registered owner: Bonnys Valley Air Service - Airworthiness certificate: Special, Restricted (Special) - Last inspection: Annual, February 1, 1998, 7 hours before - Departed: DONOHO ROAD, WA - Destination: UNKNOWN ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 43; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; flight hours: 2,753 total, 115 in this make and model, 2,468 as pilot in command, 115 in the last 90 days ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 57 °F, dew point 57 °F ## 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 19980313004259A](https://openairdocs.org/incident/19980313004259A), Mar 13, 1998: Ayres 600S2C, Bickleton, WA, Destroyed. (.4)The pilot took off 50 minutes to 1 hour before the accident, and was spraying a field at the time of the accident. He reported that on the last pass, as he… 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.