# NTSB LAX99LA281: Ayres S2R-G10, N20523, Stanfield, AZ, August 24, 1999 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: August 24, 1999, 01:30 local (08:30 UTC) - Place: Stanfield, AZ - Location: 32.8794° N, 111.9628° W: Placed by OpenAirDocs: center of Stanfield, AZ, within about 6 miles (OpenAirDocs) - Nearby events: https://openairdocs.org/map.md?lat=32.8794&lon=-111.9628&mi=10 - Phase of flight: [Takeoff](https://openairdocs.org/ntsb-phases/300) (OpenAirDocs' grouping) - Highest injury: Minor injuries - Injuries: 1 minor - Status: Completed, report August 14, 2001 - Report: Approved by Office Director - NTSB case key (mKey): 47205 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=LAX99LA281 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/47205/pdf - Page: https://openairdocs.org/ntsb/LAX99LA281 ## Probable cause The pilot's delay in aborting the takeoff after noting sluggish acceleration during the takeoff roll, which resulted in a runway overrun. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Overrun, takeoff - roll/run - airport facilities,runway/landing area condition - short runway/landing area - airspeed - not obtained, pilot in command - aborted takeoff - delayed, pilot in command (cause) - In flight collision with terrain/water, takeoff - roll/run - terrain condition - berm - terrain condition - ditch ## Analysis The pilot said that the engine temperature reached red line earlier than usual during the takeoff ground roll on the 2,200-foot-long runway, and that he reduced the throttle somewhat to keep from exceeding takeoff limitations. He reported that the acceleration seemed sluggish and the airplane overran the runway end and collided with a berm. The pilot reported that the airplane was becoming airborne right at the time of impact. Three ground crewmembers that witnessed the accident reported that they didn't notice any unusual noises from the engine, but they noted that it seemed like a 'slow acceleration.' The pilot stated that he had not experienced any mechanical problems with the aircraft prior to the accident, and reported that the engine sounded normal during the takeoff roll. He further reported that the accident could have been prevented by taking off with a lighter load. ## Factual narrative On March 24, 1999, about 0130 hours mountain standard time, an Ayres Corporation S2R-G10, N20523, ran off the end of the runway and collided with a berm during the takeoff roll at a private airstrip near Stanfield, Arizona. The airplane, operated by Crop First Aviation Inc., Stanfield, was substantially damaged. The commercial pilot sustained minor injuries. The local aerial application flight, conducted under the provisions of 14 CFR Part 137, was originating at the time of the accident. Night visual meteorological conditions prevailed and no flight plan was filed. The pilot reported that the purpose of the flight was to spray a cotton field with insecticide. The aircraft was loaded with approximately 430 gallons of chemicals and about 110 gallons of fuel. The pilot stated that he began the takeoff roll using the entire length of the 2,200-foot-long runway, and noted that the engine temperature gage reached the red line earlier than usual and he reduced the power somewhat to keep from exceeding limitations. He reported that the acceleration seemed sluggish, and the airplane overran the runway end and collided with a berm that rose about 6 to 8 feet above the runway surface. The airplane then jumped across a ditch, continued through an alfalfa field, and slid to a stop. The pilot reported that the airplane was becoming airborne right at the time of impact. Three ground crewmember/witnesses reported that they didn't notice any unusual noises from the engine, but they noted that it seemed like a "slow acceleration." The pilot reported that he had not experienced any mechanical problems with the aircraft or engine prior to the accident, and stated that the engine sounded normal during the takeoff roll. He further reported that the accident could have been prevented by taking off with a lighter load. ## Aircraft - Registration: [N20523](https://openairdocs.org/aircraft/N20523), registered now, S/N G10-147, built 1998 (OpenAirDocs) - Reported make and model: Ayres S2R-G10 - Registry model: [Ayres S2R-G10](https://openairdocs.org/model/ayres-s2r-g10) (registry code 0970217) (OpenAirDocs) - Registry engine: [AiResearch TPE331 series](https://openairdocs.org/engine/airesearch-tpe331-series) (registry code 01517, turbo-prop) (OpenAirDocs) - Category: Airplane - Serial number: G10-147 - Airframe hours: 674 - Engines: Garrett TPE331-10 900 horsepower turbo prop - Damage: Substantial damage - Flight: Aerial application, Part 137 - Registered owner: Crop First Aviation - Airworthiness certificate: Special, Restricted (Special) - Last inspection: 100 hour, August 6, 1999, 68 hours before - Airport: Ag Airstrip, runway 36, 2,200 × 80 ft, dirt ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 51; commercial, flight instructor; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 2, valid medical--no waivers/lim.; seat: center; flight hours: 7,600 total, 600 in this make and model, 7,380 as pilot in command, 300 in the last 90 days, 100 in the last 30 days ## Weather - Conditions: Visual (VMC), Night/bright - Wind: 50° at 6 knots - Visibility: 10 statute miles - Temperature: 90 °F, dew point 55 °F - Altimeter: 29.00 inHg - Observed at: CGZ, 13 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 19990824013439A](https://openairdocs.org/incident/19990824013439A), Aug 24, 1999: Ayres S2RG10, Stanfield, AZ, Substantial damage. Acft struck a berm on take-off and went into an alfalfa field, other circumstances are unknown. (.19) on March 24, 1999, at 0248 hours mountain standard time,… 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.