# NTSB SEA99LA125: Rockwell S-2R, N3649X, American Falls, ID, July 23, 1999 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: July 23, 1999, 09:00 local (15:00 UTC) - Place: American Falls, ID - Coordinates: 42.720291, -112.989509 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=42.7203&lon=-112.9895&mi=10 - Phase of flight: [Maneuvering](https://openairdocs.org/ntsb-phases/450) (OpenAirDocs' grouping) - Highest injury: Minor injuries - Injuries: 1 minor - Status: Completed, report November 30, 2000 - Report: Approved by Office Director - NTSB case key (mKey): 46986 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=SEA99LA125 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/46986/pdf - Page: https://openairdocs.org/ntsb/SEA99LA125 ## Probable cause A loss of engine power for undetermined reasons, and overload of the (right) main landing gear. A contributing factor was the rough terrain. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, maneuvering - aerial application - reason for occurrence undetermined (cause) - Forced landing, emergency descent/landing - Gear collapsed, landing - roll - landing gear,main gear - overload (cause) - terrain condition - rough/uneven (contributing factor) ## Analysis The pilot was dispensing fertilizer from a cropduster. Just before beginning a course reversal at the end of his second swath run, the Curtiss-Wright R-1820 (1200 horsepower) radial engine 'experienced a sudden and near complete loss of power' for undetermined reasons. The pilot reported that, just before starting the course reversal, he perceived a loss of engine power through a degradation of engine noise and airspeed, but the engine did not completely quit. He dumped the 2,400 pound load, maneuvered to avoid a residence and executed a forced landing to rough terrain. During the landing roll, the right landing gear collapsed. The pilot reported that this was the second flight of the morning at the same load weight. An examination of the engine revealed no mechanical malfunction. ## Factual narrative On July 23, 1999, approximately 0900 mountain daylight time, a Rockwell International S-2R agricultural spray plane, N3649X, registered to, operated by, and being flown by an airline transport pilot, was substantially damaged during a collision with a fence while executing a forced landing following a loss of power. The pilot sustained minor injuries and no flight plan had been filed. Visual meteorological conditions prevailed. The flight, which was engaged in dispensing fertilizer, was to have been operated under 14CFR137, and had originated from American Falls, Idaho, approximately 0855. The pilot, who was telephonically interviewed by the investigator-in-charge, reported that just before executing a course reversal after his second swath run, he perceived a loss of engine power through a degradation of engine noise and airspeed, but the engine did not completely quit. He further reported that the engine produced no coughing or sputtering. He attempted to correct the condition by activating the boost pump and adjusting the mixture without success. He then jettisoned the 2,400 pound fertilizer load, crossed into another field, made a 20 degree left heading change to avoid a residence, and executed a forced landing. During the landing roll, the aircraft passed through a wooden post fence and the right main landing gear collapsed. This was the second flight of the morning at the same fertilizer load weight, and the outside air temperature was estimated at 55 to 60 degrees Fahrenheit (refer to ATTACHMENT T-I). The pilot later provided a written statement (refer to attached NTSB form 6120.1/2) and reported that "about 1/2 to 2/3 thru [sic] the run I experienced a sudden and near complete loss of power. An attempt was made to regain power by activating the auxiliary fuel pump and placing the mixture into the manual rich [position]. Throttle movement had no response. The spray run was in a uphill direction and some airspeed was converted to additional altitude. After passing the end of the target field the remaining load was jettisoned into some adjacent set aside ground. A crash landing was imminent due to the rough terrain and low altitude. Landing in the rough terrain collapsed the right landing gear and terminated in a violent right turn when the right wing settled into the soft soil of a recently plowed fallow field." The engine was examined on August 25, 1999, at the facilities of Gustin Aviation, Lewiston, Idaho. The examination revealed no evidence of mechanical malfunction. Valve-train continuity was established. Compression of each cylinder was verified, as was the magneto timing. The magnetos were removed and tested with no evidence of malfunction. The oil screen and filters were examined with no blockage noted, and no ferrous particulate material was found within the engine. The engine's air intake system and controls were also checked with no discrepancies reported. ## Aircraft - Registration: [N3649X](https://openairdocs.org/deregistered/N3649X-2006-01-30), registration cancelled 2006-01-30, S/N 2151R, built 1975 (OpenAirDocs) - Reported make and model: Rockwell S-2R - Registry model: [Rockwell International S-2R](https://openairdocs.org/model/rockwell-international-s-2r) (registry code 7630202) (OpenAirDocs) - Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 2151R - Airframe hours: 3488 - Engines: Curtis Wright R-1820 1200 horsepower reciprocating - Damage: Substantial damage - Flight: Aerial application, Part 137 - Registered owner: Savage, David, E. - Airworthiness certificate: Special, Restricted (Special) - Last inspection: Annual, June 16, 1999, 57 hours before - Departed: U01, AMERICAN FALLS, ID ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 55; airline transport, flight instructor, commercial; airplane ratings: single-engine land, multi-engine land, single-engine sea; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: front; flight hours: 20,236 total, 1,275 in this make and model, 194 in the last 90 days, 2 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 66 °F, dew point 43 °F - Altimeter: 30.00 inHg - Observed at: PIH, 14 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 19990723009539A](https://openairdocs.org/incident/19990723009539A), Jul 23, 1999: Ayres S2R, American Falls, ID, Substantial damage. Acft lost power, pilot landed in field, collided with fence. (-23) during aerial application the aircraft lost power. Pilot landed aircraft in a field,… ## Other investigations on N3649X (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 FTW76FRA35](https://openairdocs.org/ntsb/FTW76FRA35), Apr 26, 1976: Aero Comdr 600S2R (N3649X), Fulsher, TX, destroyed, 1 fatal 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.