# NTSB investigations: Pratt & Whitney R1340 series, 1991

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 LAX92LA018](https://openairdocs.org/ntsb/LAX92LA018.md): Snow S2C · Bowie, AZ · Accident · No injuries · Limited investigation · Final report · Oct 17, 1991 · N1625S · Substantial damage
  > The failure of the pilot to maintain directional control after landing. The unfavorable wind condition was a related factor.
- [NTSB NYC91LA253](https://openairdocs.org/ntsb/NYC91LA253.md): North American T-6G · Manchester, NH · Accident · No injuries · Limited investigation · Final report · Sep 29, 1991 · N3167G · Substantial damage
  > The pilot's failure to maintain control. A factor was the unforecasted strong cross winds.
- [NTSB MIA91LA219](https://openairdocs.org/ntsb/MIA91LA219.md): Air Tractor AT-401 · Sumner, MS · Accident · Minor injuries · Limited investigation · Final report · Sep 16, 1991 · N1004W · Substantial damage
  > Failure of the no. 1 cylinder assembly.
- [NTSB LAX91LA392](https://openairdocs.org/ntsb/LAX91LA392.md): North American AT-6G · Reno, NV · Accident · Minor injuries · Limited investigation · Final report · Sep 12, 1991 · N29931 · Substantial damage
  > The failure of the pilot to maintain an adequate clearance between the aircraft and the ground while maneuvering around a pylon, which resulted in a loss of control during landing.
- [NTSB LAX91LA384](https://openairdocs.org/ntsb/LAX91LA384.md): North American AT-6D · Hayward, CA · Accident · No injuries · Limited investigation · Final report · Sep 2, 1991 · N3660V · Substantial damage
  > The failure of the pilot to maintain directional control of the aircraft while correcting an unwanted deviation.
- [NTSB LAX91LA362](https://openairdocs.org/ntsb/LAX91LA362.md): Schweizer G164B · Verona, CA · Accident · No injuries · Limited investigation · Final report · Aug 19, 1991 · N7501K · Substantial damage
  > The pilot's improper planning/decision to depart from a runway with high vegetation along the edge and subsequent collision with terrain.
- [NTSB LAX91LA364](https://openairdocs.org/ntsb/LAX91LA364.md): Grumman G-164 · Wasco, CA · Accident · No injuries · Limited investigation · Final report · Aug 12, 1991 · N4663 · Substantial damage
  > A total loss of engine power due to a fracture of the camshaft and the subsequent forced landing into a soft field.
- [NTSB CHI91DTG07](https://openairdocs.org/ntsb/CHI91DTG07.md): Ayres S2R · Drayton, ND · Accident · No injuries · Final report · Aug 7, 1991 · N4010H · Substantial damage
  > Misjudged clearance by the pilot. A factor related to the accident is overconfidence in personal ability.
- [NTSB SEA91LA200](https://openairdocs.org/ntsb/SEA91LA200.md): Rockwell S-2R · Murtaugh, ID · Accident · No injuries · Limited investigation · Final report · Aug 3, 1991 · N4865X · Substantial damage
  > The improper preflight planning/decision by the pilot, resulting in his attempt to takeoff with the aircraft loaded over maximum certificated gross takeoff weight.
- [NTSB FTW91DPG18](https://openairdocs.org/ntsb/FTW91DPG18.md): Grumman G-164A · Dewitt, AR · Accident · No injuries · Final report · Jul 31, 1991 · N5076 · Substantial damage
  > The pilot's failure to maintain proper glidepath. A factor was the berm at the approach end of the runway.
- [NTSB FTW91DRD07](https://openairdocs.org/ntsb/FTW91DRD07.md): Grumman G-164B · Donaldsonville, LA · Accident · No injuries · Final report · Jul 28, 1991 · N573AF · Substantial damage
  > The mechanical failure of the propeller blade pitch positioning bolt. A factor was the lack of suitable terrain available for the forced landing.
- [NTSB CHI91DTG06](https://openairdocs.org/ntsb/CHI91DTG06.md): Ayres S2R · Drayton, ND · Accident · No injuries · Final report · Jul 20, 1991 · N8988Q · Substantial damage
  > That the pilot did not perform any preflight planning, and did not use the aircraft performance data.
- [NTSB CHI91DCQ07](https://openairdocs.org/ntsb/CHI91DCQ07.md): Grumman G-164A · Sharon Springs, KS · Accident · No injuries · Final report · Jul 19, 1991 · N7964 · Substantial damage
  > Aircraft takeoff performance exceeded and disregard of performance data by the pilot. A factor associated with the accident is high density altitude.
- [NTSB FTW91DPG14](https://openairdocs.org/ntsb/FTW91DPG14.md): Grumman G-164A · Swifton, AR · Accident · No injuries · Final report · Jul 15, 1991 · N6615 · Destroyed
  > Partial failure of the hopper, chemical fire, and the failure of the landing gear. A factor ws the loss of visual outside reference.
- [NTSB ATL91LA128](https://openairdocs.org/ntsb/ATL91LA128.md): Air Tractor AT-301 · Hawkinsville, GA · Accident · Minor injuries · Limited investigation · Final report · Jul 12, 1991 · N31691 · Substantial damage
  > A complete loss of engine power for undetermined reasons. A factor in this accident was: the rough, uneven terrain at the forced landing site.
- [NTSB MIA91LA183](https://openairdocs.org/ntsb/MIA91LA183.md): Grumman G-164A · Greenwood, FL · Accident · No injuries · Limited investigation · Final report · Jul 11, 1991 · N6891Q · Destroyed
  > The inadequate preflight which resulted in debris in the cockpit which reduced the pilot's visual lookout. Unsuitable terrain encountered during the landing was a factor.
- [NTSB LAX91LA301](https://openairdocs.org/ntsb/LAX91LA301.md): Grumman G-164B · Eloy, AZ · Accident · No injuries · Limited investigation · Final report · Jul 9, 1991 · N6633K · Substantial damage
  > The failure of the pilot to maintain the terrain clearance of the aircraft while maneuvering for a potential emergency landing on a moonless dark night.
- [NTSB MIA91LA169](https://openairdocs.org/ntsb/MIA91LA169.md): Grumman G164B · Immokalee, FL · Accident · No injuries · Limited investigation · Final report · Jun 26, 1991 · N3629X · Substantial damage
  > Loss of enine power due to undetermined reasons. Contributing to the accident was unsuitable terrain encounteered during the forced landing.
- [NTSB FTW91DRG03](https://openairdocs.org/ntsb/FTW91DRG03.md): Grumman G-164A · Weslaco, TX · Accident · Serious injuries · Final report · Jun 8, 1991 · N7445 · Destroyed
  > Failure of the pilot to maintain clearance.
- [NTSB MIA91LA158](https://openairdocs.org/ntsb/MIA91LA158.md): Air Tractor AT-301 · High Springs, FL · Accident · No injuries · Limited investigation · Final report · Jun 2, 1991 · N8841S · Substantial damage
  > Loss of engine power due to disintegration of the impeller caused by a worn impeller bearing.
- [NTSB SEA91LA136](https://openairdocs.org/ntsb/SEA91LA136.md): Schweizer G-164B · Wilson Creek, WA · Accident · No injuries · Limited investigation · Final report · May 27, 1991 · N8407K · Substantial damage
  > The loss of engine power in flight due to improper overhaul of the carburetor float assembly fulcrum screw, shutting off fuel flow to the engine.
- [NTSB DEN91LA077](https://openairdocs.org/ntsb/DEN91LA077.md): Grumman G-164A · Ville Platte, LA · Accident · Serious injuries · Limited investigation · Final report · May 27, 1991 · N48383 · Substantial damage
  > Premature pull up from an aerial application swath run resulting in a collision with an electrical transmission line.
- [NTSB ANC91LA061](https://openairdocs.org/ntsb/ANC91LA061.md): Rockwell S-2R · Larsen Bay, AK · Accident · 1 fatal · Limited investigation · Final report · May 25, 1991 · N4851X · Destroyed
  > The pilot's decision to continue VFR into IMC conditions and failure to maintain proper altitude. Contributing to the accident was the low ceiling and fog.
- [NTSB FTW91DPG06](https://openairdocs.org/ntsb/FTW91DPG06.md): Grumman G-164A · Gillett, AR · Accident · No injuries · Final report · May 14, 1991 · N9785 · Substantial damage
  > The windshiled becoming obscured by aerial application spray and the resultant limited vision from the cockpit.
- [NTSB FTW91LA076](https://openairdocs.org/ntsb/FTW91LA076.md): Grumman G-164 · Pioneer, LA · Accident · No injuries · Limited investigation · Final report · May 3, 1991 · N7361 · Substantial damage
  > The pilot's use of a runway unsuitable due to recent rains.
- [NTSB MIA91LA101](https://openairdocs.org/ntsb/MIA91LA101.md): Air Tractor AT-401 · Avon, MS · Accident · Serious injuries · Limited investigation · Final report · Mar 15, 1991 · N73135 · Substantial damage
  > Loss of engine power for undetermined reasons during a turn while on an aerial application flight. Contributing to the accident was failure of the left magneto due to failure of a phenolic gear which drives the rotating magnet.
- [NTSB FTW91DPG02](https://openairdocs.org/ntsb/FTW91DPG02.md): Grumman G-164A · Light, AR · Accident · No injuries · Final report · Feb 23, 1991 · N7493 · Substantial damage
  > The pilot's selection of the downwind runway for landing. A factor was the tailwind.
- [NTSB LAX91LA109](https://openairdocs.org/ntsb/LAX91LA109.md): Rockwell S2R-600 · Corcoran, CA · Accident · No injuries · Limited investigation · Final report · Feb 18, 1991 · N4930X · Substantial damage
  > Failure of the aircraft engine's fuel pump valve assembly bypass.
- [NTSB ATL91LA059](https://openairdocs.org/ntsb/ATL91LA059.md): Air Tractor AT-301 · Pavo, GA · Accident · No injuries · Limited investigation · Final report · Feb 18, 1991 · N8770S · Substantial damage
  > The failure of the no. 2 exhaust valve and cylinder head, which resulted in a total loss of engine power. A factor in the accident was the collision with a road sign during the forced landing.
- [NTSB ANC91LA022](https://openairdocs.org/ntsb/ANC91LA022.md): De Havilland DHC-3 · Nome, AK · Accident · Serious injuries · Limited investigation · Final report · Jan 28, 1991 · N212NY · Substantial damage
  > The failure of the 1, 2, 6, 7, 8 and 9 piston linkrods which were broken at the master rod attach end. Contributing to the accident was the rough, uneven terrain.

## 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 year(c."eventDate") = 1991
  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&year=1991

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