# NTSB WPR11LA366: Ayres S2R-600, N4021S, Hazelton, ID, August 3, 2011 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: August 3, 2011, 10:00 local (16:00 UTC) - Place: Hazelton, ID - Coordinates: 42.57611, -114.137779 - Nearby events: https://openairdocs.org/map.md?lat=42.5761&lon=-114.1378&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Defining event: [Takeoff: Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342) - Highest injury: No injuries - Injuries: 1 uninjured - Status: Completed, report April 2, 2012 - Report: Approved by Office Director - NTSB office: Western Pacific Region - Parties: Federal Aviation Administration - NTSB case key (mKey): 81379 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR11LA366 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/81379/pdf - NTSB docket: https://data.ntsb.gov/Docket?ProjectID=81379 - Page: https://openairdocs.org/ntsb/WPR11LA366 ## Probable cause Partial loss of engine power for undetermined reasons. ## Findings NTSB's coded findings; those marked are part of the probable cause. - [Not determined](https://openairdocs.org/ntsb-findings/05000000): Not determined › Not determined · Unknown/Not determined (probable cause); cases with it: [Ayres S2R-600, 2 cases](https://openairdocs.org/ntsb-findings/05000000/cases.md?model=0970102), [All aircraft, 2,247 cases](https://openairdocs.org/ntsb-findings/05000000/cases.md) ## Sequence of events The events NTSB coded, in order, by phase of flight. The defining event best describes what happened. - [Takeoff: Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342) (defining event); cases with it: [Ayres S2R-600, 1 case](https://openairdocs.org/ntsb-events/342/sequence.md?model=0970102), [All aircraft, 1,858 cases](https://openairdocs.org/ntsb-events/342/sequence.md) - [Landing: Off-field or emergency landing](https://openairdocs.org/ntsb-events/440); cases with it: [Ayres S2R-600, 2 cases](https://openairdocs.org/ntsb-events/440/sequence.md?model=0970102), [All aircraft, 3,365 cases](https://openairdocs.org/ntsb-events/440/sequence.md) - [Landing-landing roll: Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470); cases with it: [Ayres S2R-600, 2 cases](https://openairdocs.org/ntsb-events/470/sequence.md?model=0970102), [All aircraft, 10,189 cases](https://openairdocs.org/ntsb-events/470/sequence.md) ## Analysis The pilot was departing on an agricultural application flight, and, during takeoff, the engine lost partial power. The pilot released the load of fertilizer and attempted to land on a road. However, the airplane was unable to sustain flight, and the pilot landed the airplane in a field. The airplane collided with concrete obstacles during the landing roll. Postaccident wreckage examination and component testing did not reveal a mechanical reason for the partial power loss. The reported weather conditions were not conducive to serious carburetor icing at cruise power; the engine was operating at a high power setting for takeoff, indicating that carburetor ice was likely not the reason for the partial loss of engine power. ## Factual narrative On August 3, 2011, at 1000 mountain daylight time, an Ayres Corporation S2R-600, N4021S, lost partial engine power shortly after takeoff and the pilot force-landed the airplane in a field approximately 4 miles southeast of Hazelton Municipal Airport, Hazelton, Idaho. Crop Jet Aviation was operating the airplane under the provisions of Title 14 Code of Federal Regulations Part 137. The commercial pilot was not injured; the airplane sustained substantial damage. Visual meteorological conditions prevailed and no flight plan was filed. The pilot reported that shortly after takeoff, the engine lost partial power. During the loss of power, the manifold pressure remained steady. He released the load of fertilizer and maneuvered over power lines to land on a road. The airplane was unable to sustain flight and the pilot landed the airplane in a field. The airplane impacted concrete obstacles, separating the landing gear from the fuselage, before coming to rest. Following the accident, the engine and propeller were examined by the Federal Aviation Administration inspector. The carburetor had been replaced 7 hours prior to the accident. About 160 hours prior to the carburetor replacement, half of the spark plugs had been replaced. Instead of the required Unison UREM40E, Unison UREM38E plugs were installed. The spark plugs appeared sooty. Continuity from the controls to the engine and propeller were intact. The magnetos were tested and operated normally. The engine was manually rotated with no problems identified. The carburetor was removed for further examination. Personnel at Gustin Aviation also examined the wreckage. The airframe fuel boost pump operated normally. Additionally, no evidence of fuel blockage throughout the system was present. The spark plugs were tested and found to be operational. The carburetor was examined at Precision Engines, Everett, Washington. Verification of the engine and carburetor combination was confirmed. Testing and disassembly of the carburetor revealed no operational anomalies. The carburetor icing probability chart from DOT/FAA/CT-82/44 Publication: Light Aircraft Piston Engine Carburetor Ice Detector/Warning Device Sensitivity/ Effectiveness, June 1982 showed a probability of serious icing at glide power at the temperature and dew point reported at the time of the accident. ## Aircraft - Registration: [N4021S](https://openairdocs.org/deregistered/N4021S-2013-11-08), registration cancelled 2013-11-08, S/N 2561R, built 1980 (OpenAirDocs) - Reported make and model: AYRES CORPORATION S2R-600 - Registry model: [Ayres S2R-600](https://openairdocs.org/model/ayres-s2r-600) (registry code 0970102) (OpenAirDocs) - Registry engine: [Pratt & Whitney R1340 series](https://openairdocs.org/engine/pratt-whitney-r1340-series) (registry code 52016, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 2561R - Airframe hours: 11754 - Engines: Pratt and Whitney R1340 600 horsepower reciprocating - Damage: Substantial damage - Flight: Aerial application, Part 137 - Operator: Crop Jet Aviation - Registered owner: Crop Jet Aviation - Airworthiness certificate: Special, Restricted (Special) - Last inspection: Annual, June 1, 2011, 7 hours before - Departed: U94, Hazelton, ID - Destination: U94, Hazelton, ID - Airport: U94, Hazelton Municipal Airport ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 33; injuries: none; commercial; airplane ratings: multi-engine land, single-engine sea, single-engine land; instrument ratings: airplane; medical: class 2, with waivers/limitations; last flight review August 12, 2009; seat: single; flight hours: 3,325 total, 1,763 in this make and model, 375 in the last 90 days, 208 in the last 30 days, 4 in the last 24 hours ## Weather - Conditions: Visual (VMC), Day - Wind: calm - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 73 °F, dew point 52 °F - Altimeter: 30.07 inHg - Observed at: KJER, 16 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 20110803016199A](https://openairdocs.org/incident/20110803016199A), Aug 3, 2011: Ayres Corporation S2R-600, Hazelton, ID, Substantial damage. On the 7th flight of the day, cruising to the field, the engine started to loose power. The pilot added flaps in order to clear a power line. The aircraft… ## Docket (5 files) The files NTSB released with the investigation on March 1, 2012, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=81379. 1.2 MB in all. - Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 754 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40360881&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.PDF - Pilot Statement (item 2, .PDF, 145 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40360883&FileExtension=.PDF&FileName=Pilot%20Statement-Redacted.PDF - FAA Record of Conversation (item 3, .PDF, 74 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363502&FileExtension=.PDF&FileName=FAA%20Record%20of%20Conversation-Master.PDF - Gustin Aviation Record of Conversation (item 4, .PDF, 64 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40363162&FileExtension=.PDF&FileName=Gustin%20Aviation%20Record%20of%20Conversation-Master.PDF - Photo 1. Wreckage at Accident Site (item 5, .PDF, 177 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40360882&FileExtension=.PDF&FileName=Photo%201.%20Wreckage%20at%20Accident%20Site-Master.PDF 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.