# NTSB investigations: Pratt & Whitney R1340 series, CO NTSB aviation accident and incident investigations since 1962: the probable cause, findings, aircraft, crew, weather and docket of each, linked to the FAA registry and the FAA’s own reports. ## Latest cases - [NTSB CEN23LA241](https://openairdocs.org/ntsb/CEN23LA241.md): Air Tractor AT-401B · Holyoke, CO · Accident · No injuries · Class 4 · Limited · Final report · Jun 15, 2023 · N6106U · Substantial damage > The pilot's failure to maintain directional control during the landing roll. - [NTSB CEN23LA235](https://openairdocs.org/ntsb/CEN23LA235.md): North American T-6G · Colorado Springs, CO · Accident · No injuries · Class 4 · Limited · Final report · Jun 9, 2023 · N16JV · Substantial damage > The pilot’s failure to maintain directional control during landing. - [NTSB CEN16FA328](https://openairdocs.org/ntsb/CEN16FA328.md): Aero Commander S2R · Center, CO · Accident · 1 fatal · Field investigation · Final report · Aug 19, 2016 · N8870Q · Destroyed > The pilot's failure to maintain airplane control during a low-level maneuver, which resulted in an aerodynamic stall. - [NTSB CEN14LA439](https://openairdocs.org/ntsb/CEN14LA439.md): Air Tractor AT-401 · Wray, CO · Accident · Minor injuries · Limited investigation · Final report · Aug 19, 2014 · N4542W · Substantial damage > A loss of the No. 1 cylinder’s compression due to a stuck exhaust valve caused by a lack of sufficient valve clearance, which resulted in a loss of engine power and a forced landing. Contributing to the loss of engine power were the worn intake and exhaust… - [NTSB CEN13LA443](https://openairdocs.org/ntsb/CEN13LA443.md): Grumman G-164A · Monte Vista, CO · Accident · No injuries · Limited investigation · Final report · Jul 29, 2013 · N5324 · Substantial damage > The partial loss of engine power due to a fatigue failure of the engine cylinder exhaust rocker housing as a result of an excessively torqued rocker assembly. - [NTSB CEN12LA513](https://openairdocs.org/ntsb/CEN12LA513.md): Grumman Acft ENG Cor G-164A · La Salle, CO · Accident · Minor injuries · Limited investigation · Final report · Aug 1, 2012 · N9822 · Substantial damage > The loss of engine power due to the detached distributor rotor. - [NTSB CEN12CA264](https://openairdocs.org/ntsb/CEN12CA264.md): Air Tractor AT-301A · Cheyenne Wells, CO · Accident · No injuries · Data collection · Final report · Mar 15, 2012 · N7306C · Substantial damage > The pilot’s inadequate compensation for the wind conditions during takeoff. - [NTSB CEN09FA425](https://openairdocs.org/ntsb/CEN09FA425.md): North American SNJ-5 · Simla, CO · Accident · 1 fatal · Field investigation · Final report · Jul 9, 2009 · N212TC · Destroyed > The pilot’s failure to maintain control of the airplane while practicing aerobatic maneuvers and his subsequent failure to recover from an inadvertent spin. - [NTSB DEN08CA154](https://openairdocs.org/ntsb/DEN08CA154.md): North American SNJ-5 · Leadville, CO · Accident · No injuries · Data collection · Final report · Sep 5, 2008 · N9813C · Substantial damage > The pilot's failure to maintain aircraft control during takeoff. - [NTSB DEN08CA135](https://openairdocs.org/ntsb/DEN08CA135.md): Grumman G-164A · Walsh, CO · Accident · No injuries · Data collection · Final report · Aug 6, 2008 · N7487 · Substantial damage > The total failure of a cylinder head assembly. Contributing to the accident was the lack of suitable terrain for a forced landing. - [NTSB DEN08LA085](https://openairdocs.org/ntsb/DEN08LA085.md): North American SNJ-5 · Wolcott, CO · Accident · Minor injuries · Limited investigation · Final report · May 5, 2008 · N12KY · Substantial damage > The failure of the engine driven fuel pump flange due to oil starvation, resulting in the loss of engine power due to fuel starvation. Contributing to the accident was the lack of suitable terrain for a forced landing. - [NTSB DEN07LA138](https://openairdocs.org/ntsb/DEN07LA138.md): Air Tractor AT-301 · Alamosa, CO · Accident · Minor injuries · Limited investigation · Final report · Aug 18, 2007 · N69WN · Substantial damage > The failure of the number one cylinder due to fatigue. Contributing to the accident was the pilot's diminished visual lookout due to the oil covered windscreen. - [NTSB DEN07LA074](https://openairdocs.org/ntsb/DEN07LA074.md): North American SNJ-5 · Pueblo, CO · Accident · No injuries · Limited investigation · Final report · Mar 13, 2007 · N12KY · 2 aircraft · Minor damage > The pilot of the North American SNJ-5 warbird's inadequate visual lookout while taxiing, resulting in an on-ground collision with the stationary Grob motor glider. - [NTSB DEN03LA016](https://openairdocs.org/ntsb/DEN03LA016.md): North American T-6G · Elbert, CO · Accident · No injuries · Limited investigation · Final report · Nov 17, 2002 · N7197C · Substantial damage > overload failure of the cable between the left rudder pedal and the tail wheel, rendering directional control impossible and resulting in an inadvertent ground loop and nose over. Contributing factors were the crosswind and the soft, wet ground. - [NTSB DEN00FA164](https://openairdocs.org/ntsb/DEN00FA164.md): North American SNJ-5 · Steamboat Spg, CO · Accident · 2 fatal · Field investigation · Final report · Sep 3, 2000 · N440JG · Destroyed > the pilot's inadvertent entry into a spin while performing aerobatics. - [NTSB DEN99LA155](https://openairdocs.org/ntsb/DEN99LA155.md): North American SNJ-4 (AT-6) · Mack, CO · Accident · Minor injuries · Limited investigation · Final report · Aug 28, 1999 · N7011C · Substantial damage > The pilot misjudging his distance and altitude from the runway. A factor was the tall crops. - [NTSB FTW97FA229](https://openairdocs.org/ntsb/FTW97FA229.md): Air Tractor AT-301 · Las Animas, CO · Accident · 1 fatal · Field investigation · Final report · Jun 19, 1997 · N7308E · Destroyed > in-flight collision with terrain, while maneuvering, for undetermined reason(s). - [NTSB FTW96LA275](https://openairdocs.org/ntsb/FTW96LA275.md): Rockwell S2R · Las Animas, CO · Accident · No injuries · Limited investigation · Final report · Jun 24, 1996 · N4907X · Substantial damage > inadequate preflight planning/preparation by the pilot. Factors relating to the accident were: the unfavorable wind condition for takeoff, and the terrain condition beyond the end of the runway. - [NTSB FTW95LA202](https://openairdocs.org/ntsb/FTW95LA202.md): Grumman-Schweizer G-164A · Joes, CO · Accident · No injuries · Limited investigation · Final report · May 14, 1995 · N9506 · Substantial damage > A total loss of power due to fuel exhaustion. Factors were: a malfunction in the fuel measuring system, the pilot's failure to perform fuel consumption calculations, and soft and unsuitable terrain for a forced landing. - [NTSB FTW94LA178](https://openairdocs.org/ntsb/FTW94LA178.md): Schweizer G-164B · Antonito, CO · Accident · No injuries · Limited investigation · Final report · May 24, 1994 · N6695K · Substantial damage > The pilot's improper compensation for wind conditions. A factor was the gusty crosswind and the pilot inadvertently becoming lost. - [NTSB DEN92LA056](https://openairdocs.org/ntsb/DEN92LA056.md): North American Harvard MK-II · Watkins, CO · Accident · No injuries · Limited investigation · Final report · Jun 8, 1992 · N90541 · Destroyed > The pilot inadvertently stalling the airplane. Factors included: the pilot's failure to maintain directional control on takeoff, and inadequate airspeed. - [NTSB DEN90LA061](https://openairdocs.org/ntsb/DEN90LA061.md): North American T-6G · Englewood, CO · Accident · No injuries · Limited investigation · Final report · Mar 11, 1990 · N2879G · Substantial damage > To be a failure of the pilot to maintain directional control. - [NTSB DEN87LA222](https://openairdocs.org/ntsb/DEN87LA222.md): North American AT-6C · Colorado Spring, CO · Accident · No injuries · Limited investigation · Final report · Aug 15, 1987 · N7058C · Substantial damage > The plt reports that he accepted a tailwind for his landing and ground-looped during the roll out. - [NTSB DEN87LA211](https://openairdocs.org/ntsb/DEN87LA211.md): North American AT-6A · Englewood, CO · Accident · No injuries · Limited investigation · Final report · Aug 7, 1987 · N90629 · Substantial damage > The plt does not possess a single engine airplane rating. The plt had a total of 18 hours in the AT-6A. Pilot was departing on a pleasure flt. Witnesses stated that the aircraft appeared to rotate prematurely, climbing at a slow airspeed and a high angle of… - [NTSB DEN87LA192](https://openairdocs.org/ntsb/DEN87LA192.md): Grumman G-164A · Romeo, CO · Accident · No injuries · Limited investigation · Final report · Jul 22, 1987 · N5398 · Substantial damage > The plt reports that the acft encountered a downdraft during the turn around following a swath run. The aircraft began to settle and collided with the ground, bounced, hit a second time and nosed over. The aircraft was loaded with 280 gals of amine and 70… - [NTSB DEN86FA231](https://openairdocs.org/ntsb/DEN86FA231.md): North American AT-6D · Redcliff, CO · Accident · 2 fatal · Field investigation · Final report · Aug 15, 1986 · N9813C · Destroyed > A husband & wife rprtd that the acft flew near their house at a very low alt, then climbed in the direction of the sun to clear over a bridge. Moments later, the acft collided with power lines that were suspended between 2 towers. The towers were located atop… - [NTSB DEN86LA220](https://openairdocs.org/ntsb/DEN86LA220.md): Grumman G-164A · Center, CO · Accident · No injuries · Limited investigation · Final report · Aug 5, 1986 · N5324 · Substantial damage > The plt reported that he was landing on a 50 ft wide dirt strip and allowed the acft to drift to the left during the landing roll. The left wing collided with wheat growing along the left side of the strip and the acft swerved further to the left. During the… - [NTSB DEN84LA153](https://openairdocs.org/ntsb/DEN84LA153.md): Grumman G-164A · Wiggins, CO · Accident · No injuries · Limited investigation · Final report · May 18, 1984 · N9822 · Substantial damage > While en route to a field for aerial application, an oil mist appeared on the windshield of the acft. Shortly after that, the eng progressively lost power & the plt made a forced landing in a pasture. During the landing roll, the acft hit a hole in the ground… - [NTSB DEN82DA121](https://openairdocs.org/ntsb/DEN82DA121.md): Ayres S-2C · Greeley, CO · Accident · No injuries · Final report · Jun 29, 1982 · N1648S · Substantial damage > After takeoff the plt noticed the oil temp was increasing & the eng began losing power at about 100 ft AGL. He was unable to gain any additional altitude. He continued flying for another 15 minutes when the eng failed completely. The eng teardown & inspection… - [NTSB DEN81FTE27](https://openairdocs.org/ntsb/DEN81FTE27.md): Grumman G-164B · Yellow Jacket, CO · Accident · No injuries · Closed · Apr 1, 1981 · N6879K · Substantial damage - [NTSB DEN76DTE78](https://openairdocs.org/ntsb/DEN76DTE78.md): N. American SNJ-4 · Trinidad, CO · Accident · Minor injuries · Closed · Jul 2, 1976 · N7406C · Substantial damage - [NTSB DEN76DTM71](https://openairdocs.org/ntsb/DEN76DTM71.md): Grumman G-164A · La Jara, CO · Accident · No injuries · Closed · Jun 20, 1976 · N9533 · Substantial damage - [NTSB DEN75FTE73](https://openairdocs.org/ntsb/DEN75FTE73.md): Grumman G-164A · Dove Creek, CO · Accident · No injuries · Closed · Jun 6, 1975 · N9694 · Destroyed - [NTSB DEN73DTE37](https://openairdocs.org/ntsb/DEN73DTE37.md): Grumman G-164 · Joes, CO · Accident · No injuries · Closed · Oct 10, 1972 · N520Y · Substantial damage - [NTSB DEN65A0076](https://openairdocs.org/ntsb/DEN65A0076.md): Boeing A-75N1 · Broomfield, CO · Accident · No injuries · Closed · May 31, 1965 · N64991 · No damage ## The whole list in SQL Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS: ```sql SELECT c."ntsbNumber", c."eventDate", c."eventType", c."eventCity", c."eventStateOrRegion", a.n_number, a."aircraftMake", a."aircraftModel", c."highestInjuryLevel", c."totalFatal", c."completionStatus", c.report_url FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = c."mKey" AND a.position = 1 WHERE c."eventStateOrRegion" = 'CO' AND c."eventCountry" = 'USA' AND c."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('52016')) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?engine=52016&state=CO --- 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.