# NTSB CHI99LA317: Ayres S-2R, N8417V, Brooten, MN, August 28, 1999 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: August 28, 1999, 14:30 local (19:30 UTC) - Place: Brooten, MN - Coordinates: 45.499752, -95.110717 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=45.4998&lon=-95.1107&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report November 30, 2000 - Report: Approved by Office Director - NTSB case key (mKey): 47246 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI99LA317 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/47246/pdf - Page: https://openairdocs.org/ntsb/CHI99LA317 ## Probable cause the compressor impeller failure and the unsuitable terrain for landing encountered by the pilot. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, maneuvering - aerial application - compressor assembly,impeller - failure (cause) - Forced landing, descent - emergency - In flight collision with terrain/water, emergency descent/landing - unsuitable terrain or takeoff/landing/taxi area - encountered (cause) ## Analysis The pilot reported that after an aerial application run of approximately 30 minutes the aircraft departed the spray-run in a climbing right turn when the engine, '...burped once or twice and quit.' The pilot reported that the terrain around his position was heavily wooded except for a narrow swamp area in which he elected to land the aircraft. During the on-scene portion of the investigation, the engine and its components were examined. Partial disassembly of the P&W R-1340-AN1 engine disclosed that the blower impeller had failed which would have restricted induction air to the cylinders. ## Factual narrative On August 28, 1999, at 1430 central daylight time, an Ayers S-2R, N8417V, piloted by a commercial pilot, sustained substantial damage during a forced landing following a loss of engine power while maneuvering near Brooten, Minnesota. Visual meteorological conditions prevailed at the time of the accident. The aerial application flight was operating under the provisions of 14 CFR Part 137 and was not on a flight plan. The pilot, the sole occupant, reported no injuries. The local flight departed Brooten Municipal Airport at 1400. According to the pilot's written statement, after an aerial application run of approximately 30 minutes he departed the spray-run in a climbing right turn when the engine, "...burped once or twice and quit." The pilot reported that the terrain around his position was heavily wooded except for a narrow swamp area in which he elected to land the aircraft. A Federal Aviation Administration (FAA) Inspector from the Minneapolis Flight Standards District Office represented the National Transportation Safety Board during the on-scene portion of the investigation. During the on-scene portion of the investigation, the engine and its components were examined. In a statement provided by the FAA Inspector he reported, "Partial disassembly of the P&W R-1340-AN1 engine disclosed that the blower impeller had failed which would have restricted induction air to the cylinders." ## Aircraft - Registration: [N8417V](https://openairdocs.org/deregistered/N8417V-2002-01-15), registration cancelled 2002-01-15, S/N 2177R (OpenAirDocs) - Reported make and model: Ayres S-2R - Registry model: [Rockwell International S-2R](https://openairdocs.org/model/rockwell-international-s-2r) (registry code 7630202) (OpenAirDocs) - Category: Airplane - Serial number: 2177R - Airframe hours: 6298 - Engines: P&W R-1340-AN1 600 horsepower reciprocating - Damage: Substantial damage - Flight: Aerial application, Part 137 - Registered owner: Benson Air Ag Inc - Airworthiness certificate: Special, Restricted (Special) - Last inspection: Annual, August 2, 1999 - Departed: 6D1 ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 67; commercial; airplane ratings: multi-engine land, single-engine sea, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: center; flight hours: 15,000 total, 1,500 in this make and model, 180 in the last 90 days, 20 in the last 30 days, 5 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: 80° at 6 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 73 °F, dew point 54 °F - Altimeter: 30.00 inHg - Observed at: ILL, 23 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 19990828025619A](https://openairdocs.org/incident/19990828025619A), Aug 28, 1999: Ayres S2R, Brooten, MN, Substantial damage. (.19) On August 28, 1999, at 1430 central daylight time, an ayers S-2R, N8417V, piloted by a commercial pilot, sustained substantial damage during a forced… 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.