# NTSB investigations: Pratt & Whitney PT6A series

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.

Page 5 of 13 · 650 cases

## Cases, newest first

- [NTSB ERA14LA071](https://openairdocs.org/ntsb/ERA14LA071.md): Piper PA-46-500TP · Monroe, NC · Accident · No injuries · Limited investigation · Final report · Nov 24, 2013 · N4185L · Substantial damage
  > The pilot’s operation of the airplane with underinflated tires, which resulted in the right tire’s failure during takeoff and a subsequent runway excursion.
- [NTSB WPR14FA024](https://openairdocs.org/ntsb/WPR14FA024.md): Cessna 208 · Wailea, HI · Accident · No injuries · Field investigation · Final report · Oct 22, 2013 · N861MA · Substantial damage
  > Improper maintenance that resulted in contamination of the engine's compressor turbine disc and blade assembly by glass bead remnants, which resulted in a blade failure.
- [NTSB DCA13FA148](https://openairdocs.org/ntsb/DCA13FA148.md): Beech 1900D · Telluride, CO · Accident · No injuries · Field investigation · Final report · Sep 1, 2013 · N169GL · Substantial damage
  > Failure of the left main landing gear actuator internal lock to engage in the locked position for undetermined reasons.
- [NTSB CEN13LA568](https://openairdocs.org/ntsb/CEN13LA568.md): Air Tractor AT 802 · Gould, AR · Accident · No injuries · Limited investigation · Final report · Aug 28, 2013 · N9119B · Substantial damage
  > The failure of a bearing in the fuel control unit, which resulted in fuel starvation and a total loss of engine power.
- [NTSB CEN13LA421](https://openairdocs.org/ntsb/CEN13LA421.md): Cessna 208B · Chicago, IL · Accident · No injuries · Limited investigation · Final report · Jul 17, 2013 · N732MD · Substantial damage
  > The gate agent’s premature removal of the tailstand without confirming with the flight crew that it was safe to remove, which allowed the airplane to tilt backward when a passenger stood up and stepped toward the back of the airplane.
- [NTSB CEN13LA473](https://openairdocs.org/ntsb/CEN13LA473.md): Air Tractor AT-502B · Nauvoo, IL · Accident · No injuries · Limited investigation · Final report · Jul 15, 2013 · N6113C · Substantial damage
  > A fatigue failure of an engine compressor turbine blade, which resulted in extensive secondary engine damage and a complete loss of engine power.
- [NTSB CEN13LA414](https://openairdocs.org/ntsb/CEN13LA414.md): Ayres S2R-T41 · Coy, AR · Accident · Minor injuries · Limited investigation · Final report · Jul 10, 2013 · N2239B · Substantial damage
  > The propeller’s uncommanded reverse thrust during the landing flare due to improper rigging of the propeller’s governor linkage.
- [NTSB CEN13LA402](https://openairdocs.org/ntsb/CEN13LA402.md): Air Tractor AT-502B · Tillar, AR · Accident · No injuries · Limited investigation · Final report · Jul 3, 2013 · N5182C · Substantial damage
  > The loss of engine throttle control during takeoff due to an unsecured cockpit throttle control pin, which resulted in a runway overrun.
- [NTSB CEN13LA371](https://openairdocs.org/ntsb/CEN13LA371.md): Air Tractor AT-502B · Campbell, NE · Accident · No injuries · Limited investigation · Final report · Jun 23, 2013 · N6017E · Substantial damage
  > The pilot's decision to continue with the takeoff roll despite the airplane's difficulty becoming airborne The high-density altitude likely contributed to the airplane's reduced performance.
- [NTSB CEN13LA353](https://openairdocs.org/ntsb/CEN13LA353.md): Air Tractor AT-802A · Minot, ND · Accident · Serious injuries · Limited investigation · Final report · Jun 16, 2013 · N8522S · Substantial damage
  > The pilot’s failure to maintain adequate clearance from trees during an aerial application flight.
- [NTSB WPR13LA233](https://openairdocs.org/ntsb/WPR13LA233.md): Schweizer G-164D · Butte City, CA · Accident · Minor injuries · Limited investigation · Final report · May 16, 2013 · N83110 · Substantial damage
  > The pilot's failure to maintain airplane control after an encounter with wake turbulence while maneuvering at low altitude. Contributing to the accident was the pilot’s fatigue due to extended hours of wakefulness and high workload.
- [NTSB CEN13IA270](https://openairdocs.org/ntsb/CEN13IA270.md): Piaggio P180 · Clearwater, FL · Incident · No injuries · Incident investigation · Final report · Apr 24, 2013 · N139SL · Minor damage
  > The failure of the nose landing gear steering manifold during landing, which resulted in an uncommanded and uncontrollable right turn, and the overhaul facility’s improper overhaul of the nose landing gear steering manifold.
- [NTSB WPR13CA228](https://openairdocs.org/ntsb/WPR13CA228.md): Socata TBM 700 · Sandy Valley, NV · Accident · No injuries · Data collection · Final report · Apr 6, 2013 · N751J · Substantial damage
  > The pilot's failure to extend the landing gear, which resulted in a gear-up landing.
- [NTSB ERA13FA168](https://openairdocs.org/ntsb/ERA13FA168.md): Piper PA-31T · Fort Lauderdale, FL · Accident · 3 fatal · Field investigation · Final report · Mar 15, 2013 · N63CA · Destroyed
  > The pilot's failure to maintain airplane control following an emergency, the nature of which could not be determined because of crash and fire damage, which resulted in an aerodynamic stall.
- [NTSB CEN13LA171](https://openairdocs.org/ntsb/CEN13LA171.md): Piper PA46 · Grand Island, NE · Accident · No injuries · Limited investigation · Final report · Feb 13, 2013 · N32CA · Substantial damage
  > The pilot's failure to maintain airplane control after engine start.
- [NTSB CEN13LA168](https://openairdocs.org/ntsb/CEN13LA168.md): Air Tractor AT-502 · Forrest City, AR · Accident · Minor injuries · Limited investigation · Final report · Feb 7, 2013 · N198LA · Substantial damage
  > The in-flight separation of the left aileron's push-pull rod and hardware. Contributing to the accident was the failure of maintenance personnel to apply proper torque to the self-locking nuts.
- [NTSB CEN13FA135](https://openairdocs.org/ntsb/CEN13FA135.md): Cessna 208B · Pellston, MI · Accident · 1 fatal · Field investigation · Final report · Jan 16, 2013 · N1120N · Destroyed
  > The pilot's inadvertent controlled descent into terrain due to spatial disorientation. Contributing to the accident was lack of visual reference due to night conditions.
- [NTSB CEN13FA131](https://openairdocs.org/ntsb/CEN13FA131.md): Piper PA46-500TP · Paris, TX · Accident · 3 fatal · Field investigation · Final report · Jan 12, 2013 · N5339V · Destroyed
  > The pilot's encounter with convective weather, which resulted in a loss of airplane control.
- [NTSB CEN13FA080](https://openairdocs.org/ntsb/CEN13FA080.md): Cessna 208B · Bryans Corner, OK · Accident · Minor injuries · Field investigation · Final report · Nov 30, 2012 · N1324G · Substantial damage
  > The total loss of engine power as a result of a fractured compressor turbine blade due to fatigue cracking.
- [NTSB CEN13FA049](https://openairdocs.org/ntsb/CEN13FA049.md): Cessna 208B · Wichita, KS · Accident · 1 fatal · Field investigation · Final report · Nov 6, 2012 · N793FE · Substantial damage
  > The total loss of engine power as a result of a fractured compressor turbine blade due to high-cycle fatigue.
- [NTSB CEN13CA043](https://openairdocs.org/ntsb/CEN13CA043.md): Fairchild Heli-Porter Pilatus PC6/B1A-H2 · Georgetown, OH · Accident · Minor injuries · Data collection · Final report · Nov 3, 2012 · N476XP · Substantial damage
  > The pilot's improper recovery from a bounced landing, which resulted in a loss of control.
- [NTSB ERA12CA581](https://openairdocs.org/ntsb/ERA12CA581.md): Cessna 208B · Statesboro, GA · Accident · No injuries · Data collection · Final report · Sep 26, 2012 · N127AR · Substantial damage
  > The pilot’s inadequate flare, which resulted in a hard landing.
- [NTSB WPR12LA433](https://openairdocs.org/ntsb/WPR12LA433.md): Air Tractor AT-502 · Firebaugh, CA · Accident · No injuries · Limited investigation · Final report · Sep 22, 2012 · N4556S · Substantial damage
  > The pilot’s decision to continue the takeoff after the engine stopped producing its full-rated torque while operating in high-density altitude conditions and his subsequent failure to maintain clearance from the power transmission wires.
- [NTSB ERA12CA517](https://openairdocs.org/ntsb/ERA12CA517.md): Air Tractor AT-402B · Gum Neck, NC · Accident · No injuries · Data collection · Final report · Aug 17, 2012 · N5127T · Substantial damage
  > The pilot's failure to maintain airplane control during the takeoff roll. Contributing to the accident was the rough condition of the runway.
- [NTSB CEN12CA568](https://openairdocs.org/ntsb/CEN12CA568.md): Air Tractor AT-502B · Bogata, TX · Accident · No injuries · Data collection · Final report · Aug 17, 2012 · N6047G · Substantial damage
  > The pilot’s inadequate preflight planning, which resulted in the airplane’s loading beyond its maximum gross weight.
- [NTSB CEN12FA521](https://openairdocs.org/ntsb/CEN12FA521.md): Ayres S2R-T34 · Lakin, KS · Accident · No injuries · Field investigation · Final report · Aug 6, 2012 · N365SM · Substantial damage
  > The pilot's failure to maintain clearance from the corn during an aerial application flight.
- [NTSB CEN12LA500](https://openairdocs.org/ntsb/CEN12LA500.md): Air Tractor AT-502B · Newellton, LA · Accident · No injuries · Limited investigation · Final report · Aug 1, 2012 · N5128U · Substantial damage
  > The pilot's inadequate takeoff planning and his use of an improper flap setting, which resulted in a runway excursion and collision with terrain during takeoff.
- [NTSB WPR12FA332](https://openairdocs.org/ntsb/WPR12FA332.md): Piaggio P180 · Henderson, NV · Accident · No injuries · Field investigation · Final report · Jul 28, 2012 · N146SL · Substantial damage
  > The failure of maintenance personnel to properly torque the elevator attachment hardware in accordance with the maintenance manual, which led to the detachment of the elevator. Contributing to the accident were maintenance personnel's failure to identify the…
- [NTSB CEN12LA459](https://openairdocs.org/ntsb/CEN12LA459.md): Air Tractor AT-502B · Wisner, LA · Accident · Serious injuries · Limited investigation · Final report · Jul 18, 2012 · N205SK · Substantial damage
  > The pilot’s inadequate takeoff planning that did not consider the reduced acceleration due to a rough, turf runway and his use of an improper flap setting, which resulted in a collision with terrain during takeoff.
- [NTSB ERA12LA435](https://openairdocs.org/ntsb/ERA12LA435.md): Piper PA-42 · Charleston, WV · Accident · No injuries · Limited investigation · Final report · Jul 9, 2012 · N332SM · Substantial damage
  > The airplane’s encounter with a gravity-wave duct atmospheric phenomenon.
- [NTSB CEN12LA323](https://openairdocs.org/ntsb/CEN12LA323.md): Thrush S2RHG-T65 · Alicia, AR · Accident · No injuries · Limited investigation · Final report · May 25, 2012 · N40475 · 2 aircraft · Substantial damage
  > The pilot of the Thrush did not execute a go-around prior to landing, which resulted in excessive ground speed after touchdown, and his subsequent loss of directional control, which resulted in a collision with the Air Tractor.
- [NTSB CEN12FA312](https://openairdocs.org/ntsb/CEN12FA312.md): Air Tractor AT-802A · Sedgwick, AR · Accident · 1 fatal · Field investigation · Final report · May 23, 2012 · N4126T · 2 aircraft · Substantial damage
  > The inability of both pilots to see and avoid the other airplane, which resulted in a midair collision. Contributing to the accident was the distraction of the Air Tractor pilot by a cellular telephone conversation during the flight.
- [NTSB WPR12LA220](https://openairdocs.org/ntsb/WPR12LA220.md): Grumman G 164D · Nicolaus, CA · Accident · 1 fatal · Limited investigation · Final report · May 21, 2012 · N8267K · Substantial damage
  > The pilot’s failure to maintain airplane control during a low-altitude maneuver.
- [NTSB CEN12LA310](https://openairdocs.org/ntsb/CEN12LA310.md): Air Tractor AT-602 · Humnoke, AR · Accident · No injuries · Limited investigation · Final report · May 19, 2012 · N85239 · Substantial damage
  > The pilot’s failure to attain the proper touchdown point, which resulted in a landing undershoot.
- [NTSB WPR12TA445](https://openairdocs.org/ntsb/WPR12TA445.md): Beech C90 · Boise, ID · Accident · No injuries · Final report · May 10, 2012 · N14CP · Substantial damage
  > Excessive loading on the left wing, which occurred over a period of time. Contributing to the accident was maintenance personnel’s failure to adequately inspect and document the left wing damage.
- [NTSB CEN12CA301](https://openairdocs.org/ntsb/CEN12CA301.md): Air Tractor AT-502B · El Campo, TX · Accident · No injuries · Data collection · Final report · May 7, 2012 · N5016P · Substantial damage
  > The pilot's decision to rotate early, the airplane’s subsequent inability to climb, and the pilot’s delayed decision to abort the takeoff.
- [NTSB CEN12LA236](https://openairdocs.org/ntsb/CEN12LA236.md): Ayres S2R-T15 · Lakin, KS · Accident · Serious injuries · Limited investigation · Final report · Apr 9, 2012 · N64DX · Substantial damage
  > The pilot did not maintain sufficient airspeed while maneuvering, which resulted in an aerodynamic stall at a low altitude.
- [NTSB CEN12CA221](https://openairdocs.org/ntsb/CEN12CA221.md): Air Tractor AT-402A · Ganado, TX · Accident · No injuries · Data collection · Final report · Apr 2, 2012 · N4544S · Substantial damage
  > The improper positioning of the hopper vent, which allowed chemicals to escape and cover the airplane's windshield.
- [NTSB ENG12IA024](https://openairdocs.org/ntsb/ENG12IA024.md): Beech 1900D · Hays, KS · Incident · No injuries · Incident investigation · Final report · Mar 13, 2012 · N178YV · Minor damage
  > A failure of the nose landing gear end cap due to fatigue. Contributing to the failure were the ineffective inspection and the unknown effect of grain direction on fatigue life.
- [NTSB WPR12CA069](https://openairdocs.org/ntsb/WPR12CA069.md): Cessna 208 · Mesquite, NV · Accident · Minor injuries · Data collection · Final report · Dec 17, 2011 · N275PM · Substantial damage
  > The pilot's improper preflight planning, which resulted in a loss of engine power due to fuel exhaustion.
- [NTSB ENG12IA013](https://openairdocs.org/ntsb/ENG12IA013.md): Beech 1900D · Denver International Airport, CO · Incident · No injuries · Incident investigation · Final report · Dec 3, 2011 · N247GL · Minor damage
  > A failure of the nose landing gear end cap due to fatigue. Contributing to the failure were the ineffective inspection and the unknown effect of grain direction on fatigue life.
- [NTSB ERA12CA003](https://openairdocs.org/ntsb/ERA12CA003.md): Air Tractor AT-502B · Fort Pierce, FL · Accident · Serious injuries · Data collection · Final report · Oct 4, 2011 · N90805 · Substantial damage
  > The pilot's delayed decision to abort the takeoff.
- [NTSB CEN11LA593](https://openairdocs.org/ntsb/CEN11LA593.md): Air Tractor AT-400 · Monango, ND · Accident · Serious injuries · Limited investigation · Final report · Aug 23, 2011 · N23720 · Substantial damage
  > The pilot did not maintain adequate separation from a tree during the aerial-application flight.
- [NTSB WPR11LA388](https://openairdocs.org/ntsb/WPR11LA388.md): Air Tractor AT-602 · Pine Bluffs, WY · Accident · Minor injuries · Limited investigation · Final report · Aug 17, 2011 · N8518Y · Substantial damage
  > The pilot's failure to maintain clearance from power lines during an aerial application flight.
- [NTSB CEN11LA571](https://openairdocs.org/ntsb/CEN11LA571.md): Air Tractor AT-402 · Uvalde, TX · Accident · No injuries · Limited investigation · Final report · Aug 13, 2011 · N10119 · Substantial damage
  > The pilot’s failure to maintain airspeed while maneuvering to avoid power lines during a precautionary landing, which resulted an aerodynamic stall. Contributing to the accident was the fluctuating engine power for undetermined reasons and the pilot's…
- [NTSB WPR11LA278](https://openairdocs.org/ntsb/WPR11LA278.md): Air Tractor AT-502 · Blackfoot, ID · Accident · No injuries · Limited investigation · Final report · Jun 21, 2011 · N1515P · Substantial damage
  > A partial loss of engine power during takeoff for undetermined reasons.
- [NTSB CEN11LA404](https://openairdocs.org/ntsb/CEN11LA404.md): Ayres S2R-T34 · Athleimer, AR · Accident · Minor injuries · Limited investigation · Final report · Jun 16, 2011 · N30902 · Substantial damage
  > Failure of the first stage planetary gearset in the propeller reduction gearbox, which resulted in catastrophic engine failure. Contributing to the failure was the misrepresentation of the gearset being zero-timed by the company that sold the gearset to the…
- [NTSB WPR11CA252](https://openairdocs.org/ntsb/WPR11CA252.md): Air Tractor AT-502B · Odessa, WA · Accident · No injuries · Data collection · Final report · Jun 7, 2011 · N6072X · 2 aircraft · Minor damage
  > The pilot's failure to maintain clearance from the other aircraft.
- [NTSB WPR11LA245](https://openairdocs.org/ntsb/WPR11LA245.md): Piper PA-46-310P · Lake Havasu, AZ · Accident · No injuries · Limited investigation · Final report · Jun 2, 2011 · N712MK · Substantial damage
  > The failure of the low pressure switch in the normal landing gear system, which prevented normal operation of that system, and the misrigging of the emergency extension gear release valve, which prevented the system from being depressurized to allow for the…
- [NTSB ANC11LA048](https://openairdocs.org/ntsb/ANC11LA048.md): Dehavilland DHC-3T · Bettles Field, AK · Accident · No injuries · Limited investigation · Final report · May 28, 2011 · N87AW · Substantial damage
  > The pilot's selection of unsuitable terrain for the landing, which resulted in a loss of directional control.

Next page: https://openairdocs.org/ntsb.md?engine=52032&page=6

## 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."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('52032', '52034'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=52032&page=5

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