# NTSB investigations: Pratt & Whitney R1340 series: Loss of engine power(partial) - mech failure/malf 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 1 of 2 · 55 cases ## Latest cases - [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 DFW05CA186](https://openairdocs.org/ntsb/DFW05CA186.md): Grumman-Schweizer G-164A · Tallulah, LA · Accident · Minor injuries · Data collection · Final report · Jul 21, 2005 · N8891H · Substantial damage > The partial loss of engine power as result of the fracture of the number five-cylinder exhaust valve rocker arm mounting boss. A contributing factor was the lack of suitable terrain for the forced landing. - [NTSB FTW04LA176](https://openairdocs.org/ntsb/FTW04LA176.md): Rockwell S-2R · Jonesville, LA · Accident · Minor injuries · Limited investigation · Final report · Jul 6, 2004 · N8486V · Substantial damage > The pilot's failure to maintain clearance with the power lines. - [NTSB LAX04LA267](https://openairdocs.org/ntsb/LAX04LA267.md): Schweizer G-164B · Richvale, CA · Accident · No injuries · Limited investigation · Final report · Jun 7, 2004 · N3626T · Substantial damage > the loss of engine power during takeoff due to the engine's deteriorated fuel control unit's inner drive shaft bearing. The reason for the bearing's deteriorated condition could not be determined. - [NTSB NYC03LA168](https://openairdocs.org/ntsb/NYC03LA168.md): Air Tractor AT-301 · Rhinebeck, NY · Accident · Minor injuries · Limited investigation · Final report · Jul 26, 2003 · N23820 · Substantial damage > A loss of engine power due to a failure of the number eight cylinder. - [NTSB ANC01LA138](https://openairdocs.org/ntsb/ANC01LA138.md): de Havilland DHC-3 · Cordova, AK · Accident · Minor injuries · Limited investigation · Final report · Sep 7, 2001 · N254AW · Substantial damage > The loss of engine power during cruise due to the fracture of an engine cylinder exhaust valve. - [NTSB CHI01LA229](https://openairdocs.org/ntsb/CHI01LA229.md): Grumman-Schweizer G-164A · Dodge Center, MN · Accident · No injuries · Limited investigation · Final report · Jul 22, 2001 · N5398 · Destroyed > The pilot not maintaining directional control on the ground during the takeoff roll. Factors relating to this accident were the total failure of the propeller governor and the corn crop. - [NTSB LAX00LA261](https://openairdocs.org/ntsb/LAX00LA261.md): Grumman G-164A · Gridley, CA · Accident · No injuries · Limited investigation · Final report · Jul 11, 2000 · N897X · Substantial damage > A partial loss of engine power due to the failure of an exhaust valve during an aerial application flight. - [NTSB FTW00LA097](https://openairdocs.org/ntsb/FTW00LA097.md): Grumman-Schweizer G-164A · Gillett, AR · Accident · No injuries · Limited investigation · Final report · Mar 13, 2000 · N9785 · Substantial damage > The cracked #8 cylinder resulting in failure of the cylinder. A factor was the plowed/furrowed terrain. - [NTSB ATL98LA115](https://openairdocs.org/ntsb/ATL98LA115.md): Schweizer G164B · Newton, MS · Accident · No injuries · Limited investigation · Final report · Aug 16, 1998 · N7502A · Substantial damage > The erosion of the compressor impeller and the unsecured fuel control unit resulted in the loss of engine power during the initial climb. - [NTSB FTW98LA259](https://openairdocs.org/ntsb/FTW98LA259.md): Ayres S2R · Watson, AR · Accident · No injuries · Limited investigation · Final report · Jun 5, 1998 · N4007Y · Substantial damage > The partial loss of engine power due to the disconnection of the propeller governor control as a result of the stripped threads on the propeller governor control push-pull rod. A factor was the lack of suitable terrain for the forced landing. - [NTSB ATL97LA127](https://openairdocs.org/ntsb/ATL97LA127.md): Air Tractor AT-301 · Clewiston, FL · Accident · No injuries · Limited investigation · Final report · Aug 29, 1997 · N7307C · Substantial damage > The crack in the #8 cylinder head which led to the loss of power. A factor was the soft terrain. - [NTSB FTW97LA322](https://openairdocs.org/ntsb/FTW97LA322.md): Rockwell S-2R · Columbus, NM · Accident · Serious injuries · Limited investigation · Final report · Aug 21, 1997 · N4893X · Substantial damage > a loss of engine power due to failure of an exhaust side rocker box and valve mechanism, and pilot incapacitation due to loss of consciousness after being struck in the head by parts separating from the engine. - [NTSB MIA97LA190](https://openairdocs.org/ntsb/MIA97LA190.md): Schweizer G-164B · Edwards, MS · Accident · No injuries · Limited investigation · Final report · Jun 20, 1997 · N6816Q · Substantial damage > failure of the distributor drive gear in the right magneto, resulting in loss of engine power and a forced landing. The lack of suitable terrain for a forced landing was a related factor. - [NTSB FTW96LA388](https://openairdocs.org/ntsb/FTW96LA388.md): Schweizer G-164B · Ferriday, LA · Accident · No injuries · Limited investigation · Final report · Sep 17, 1996 · N8498K · Substantial damage > The partial loss of engine power due to a cracked cylinder head. Factors were the oil leak which restricted the pilot's visual lookout and the lack of suitable terrain for the forced landing. - [NTSB LAX96LA299](https://openairdocs.org/ntsb/LAX96LA299.md): Grumman-Schweizer G-164A · Caruthers, CA · Accident · Minor injuries · Limited investigation · Final report · Aug 8, 1996 · N8598H · Substantial damage > the loss of engine power due to the failure of a cylinder. The road's soft surface was a factor. - [NTSB NYC96LA105](https://openairdocs.org/ntsb/NYC96LA105.md): Grumman-Schweizer G-164A · Vineland, NJ · Accident · No injuries · Limited investigation · Final report · May 14, 1996 · N6620Q · Substantial damage > failure of the number 8 cylinder, which resulted in loss of engine power, a forced landing in soft terrain, and subsequent nose over of the airplane. - [NTSB FTW95LA301](https://openairdocs.org/ntsb/FTW95LA301.md): Air Tractor AT-401 · Cash, AR · Accident · No injuries · Limited investigation · Final report · Jul 11, 1995 · N1004W · Substantial damage > Engine power loss due to partial failure of one magneto combined with total failure of the other magneto. A factor was the lack of suitable terrain for a forced landing. - [NTSB FTW95LA282](https://openairdocs.org/ntsb/FTW95LA282.md): Aero Commander S2R · Newport, AR · Accident · No injuries · Limited investigation · Final report · Jul 6, 1995 · N5654X · Substantial damage > A disconnected throttle push pull rod, due to inadequate maintenance. A factor relating to the accident was: the lack of suitable terrain for the forced landing. - [NTSB FTW94LA238](https://openairdocs.org/ntsb/FTW94LA238.md): Rockwell S-2R · Winchester, AR · Accident · Serious injuries · Limited investigation · Final report · Jul 15, 1994 · N4903X · Substantial damage > The loss of power due to the number one cylinder head cracking. A factor was the lack of suitable terrain for the forced landing. - [NTSB FTW94LA145](https://openairdocs.org/ntsb/FTW94LA145.md): Grumman G-164A · El Campo, TX · Accident · Serious injuries · Limited investigation · Final report · May 7, 1994 · N9682 · Destroyed > The partial loss of engine power due to one magneto being weak and the other magneto arcing inside its case. A factor was the lack of suitable terrain for the forced landing. - [NTSB ATL93LA157](https://openairdocs.org/ntsb/ATL93LA157.md): Air Tractor AT301 · Deatsville, AL · Accident · No injuries · Limited investigation · Final report · Sep 11, 1993 · N36613 · Substantial damage > Was a crack in no.3 cylinder head which resulted in the loss of engine power. - [NTSB LAX93LA327](https://openairdocs.org/ntsb/LAX93LA327.md): Air Tractor AT-301 · Dos Palos, CA · Accident · No injuries · Limited investigation · Final report · Aug 18, 1993 · N2330V · Substantial damage > The failure of the master rod which resulted in a complete loss of engine power and subsequent forced landing. The irrigation ditch was a factor in this accident. - [NTSB FTW93LA239](https://openairdocs.org/ntsb/FTW93LA239.md): Grumman-Schweizer G-164A · Garwood, TX · Accident · No injuries · Limited investigation · Final report · Aug 13, 1993 · N7993 · Substantial damage > The partial power loss for undetermined reasons. A factor was the lack of suitable terrain onto which a forced landing could be executed. - [NTSB BFO93LA142](https://openairdocs.org/ntsb/BFO93LA142.md): North American AT-6 · Matawan, NJ · Accident · No injuries · Limited investigation · Final report · Jul 30, 1993 · N6617X · Substantial damage > The water collection in the ignition harness which rendered the lower cylinder spark plugs inoperative resulting in partial power loss. - [NTSB MIA93LA104](https://openairdocs.org/ntsb/MIA93LA104.md): Air Tractor AT-401 · Fort Pierce, FL · Accident · Minor injuries · Limited investigation · Final report · Apr 17, 1993 · N7316L · Destroyed > Failure of the no. 2 cylinder in fatigue for undetermined reasons, over unsuitable terrain. The lack of suitale terrain for the forced landing was a factor. - [NTSB SEA93LA078](https://openairdocs.org/ntsb/SEA93LA078.md): Schweizer G-164B-600 · Quincy, WA · Accident · No injuries · Limited investigation · Final report · Mar 18, 1993 · N7503L · Substantial damage > Unsuitable terrain encountered during a forced landing after an engine cylinder assembly had separated. Factors include a snowbank. - [NTSB MIA92LA160](https://openairdocs.org/ntsb/MIA92LA160.md): Air Tractor AT-301 · Redwood, MS · Accident · No injuries · Limited investigation · Final report · Aug 7, 1992 · N3165A · Substantial damage > Improper maintenance of the airplane by an unknown person. - [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 FTW90DPG13](https://openairdocs.org/ntsb/FTW90DPG13.md): Grumman G-164A · Luxora, AR · Accident · No injuries · Final report · Aug 30, 1990 · N5213 · Substantial damage > A partial power loss due to failure of the number five connecting rod. A factor was the soft terrain in which the forced landing was made. - [NTSB ANC90LA103](https://openairdocs.org/ntsb/ANC90LA103.md): De Havilland DHC-3 · Beaver Village, AK · Accident · Minor injuries · Limited investigation · Final report · Jun 30, 1990 · N17689 · Substantial damage > Mechanical failure of an exhaust rocker arm. - [NTSB MKC90LA128](https://openairdocs.org/ntsb/MKC90LA128.md): Air Tractor AT-301 · Ulysses, KS · Accident · No injuries · Limited investigation · Final report · Jun 15, 1990 · N3650Z · Substantial damage > Failure of the powerplant cylinder and stall/mush encountered by the pilot in command. - [NTSB FTW90DRA05](https://openairdocs.org/ntsb/FTW90DRA05.md): Grumman 164-B · Garwood, TX · Accident · No injuries · Final report · May 25, 1990 · N9982 · Destroyed > The power loss due to super charger impeller failure. - [NTSB FTW90DRD07](https://openairdocs.org/ntsb/FTW90DRD07.md): Grumman G-164A · Ville Platte, LA · Accident · No injuries · Final report · May 2, 1990 · N8938H · Destroyed > Partial loss of engine power due to a cracked number four cylinder intake rocker box housing. The lack of a suitable forced landing site was a related factor. - [NTSB LAX89DVG07](https://openairdocs.org/ntsb/LAX89DVG07.md): Schweizer G-164B · Willows, CA · Accident · No injuries · Final report · Jul 4, 1989 · N3627G · Substantial damage > Failure of the connecting rod on #1 cylinder of the aircraft powerplant. - [NTSB SEA89LA071](https://openairdocs.org/ntsb/SEA89LA071.md): Air Tractor AT-301 · Grangeville, ID · Accident · Minor injuries · Limited investigation · Final report · Apr 17, 1989 · N4340S · Substantial damage > A partial power loss due to a blower failure. A factor related to the accident was the soft field condition. - [NTSB FTW89DPJ03](https://openairdocs.org/ntsb/FTW89DPJ03.md): Air Tractor 301 · Jefferson, OK · Accident · No injuries · Final report · Apr 7, 1989 · N4369S · Substantial damage > Loss of engine power, due to a cracked number 4 cylinder. A factor related to the accident was: the terrace (dirt bank) in the emergency landing area. - [NTSB ATL88DKG15](https://openairdocs.org/ntsb/ATL88DKG15.md): Rockwell S2R · Pelham, GA · Accident · Minor injuries · Final report · Aug 30, 1988 · N4887X · Destroyed > The crop duster had completed the third swath run of the morning when the engine began to lose power. The plt released the contents of the hopper and made a forced landing in a soybean field. During the landing roll, the airplane nosed over and a ground fire… - [NTSB MKC88LA161](https://openairdocs.org/ntsb/MKC88LA161.md): Grumman G-164A · Gillett, AR · Accident · No injuries · Limited investigation · Final report · Aug 20, 1988 · N6567 · Substantial damage > While en route to engage in an aerial application operation, the plt said the engine began to misfire and cut out. Unable to correct the malfunction, the plt dumped his chemical load and began returning to the departure airstrip. En route, he felt he would… - [NTSB MIA88LA147](https://openairdocs.org/ntsb/MIA88LA147.md): Air Tractor AT-301 · Hastings, FL · Accident · Minor injuries · Limited investigation · Final report · Apr 14, 1988 · N8841S · Substantial damage > While on an aerial application flt shortly after takeoff, the eng lost power. The plt then dumped the load of fertilizer & landed the acft in a field. After touchdown it nosed over & came to rest. Examination of the eng revealed that the no. four cylinder… - [NTSB LAX87DJA09](https://openairdocs.org/ntsb/LAX87DJA09.md): Emair MA-1-B · Paauilo, HI · Accident · No injuries · Final report · Sep 11, 1987 · N9924M · Substantial damage > During an aerial application flt, just after take off, the plt noted that the engine oil temp was high and that blue smoke was coming from the engine. Unable to land at the airport, the acft collided with the terrain short of the runway and nosed over.… - [NTSB BFO86FID06](https://openairdocs.org/ntsb/BFO86FID06.md): Ayres S2R · Virginia Beach, VA · Accident · Minor injuries · Final report · Jun 5, 1986 · N7797V · Substantial damage > The acft was ditched after a loss of power during takeoff. Plt was unable to maintain alt & dumped liquid fertilizer load prior to landing. After ditching in a shallow canal the acft nosed over. Post accident investigation revealed a cracked cylinder in the… - [NTSB CHI85LA373](https://openairdocs.org/ntsb/CHI85LA373.md): Schweizer G-164A · Irwin, OH · Accident · No injuries · Limited investigation · Final report · Sep 11, 1985 · N48514 · Destroyed > At an alt of aprx 20 ft AGL after takeoff, the #1 cylinder failed. A straight ahead landing was made in a corn field during which the acft was destroyed. The eng had under gone a major overhaul 197 hrs prior to this accident. - [NTSB CHI85LA360](https://openairdocs.org/ntsb/CHI85LA360.md): Schweizer G164A "450" · Constantine, MI · Accident · No injuries · Limited investigation · Final report · Aug 29, 1985 · N8444K · Substantial damage > The acft nosed over during a forced landing in a corn fld. The plt stated that at 30 ft AGL during his second swath run the eng backfired and lost pwr. He attempted to dump the load however, the acft continued to loose alt and the forced landing resulted.… - [NTSB FTW85LA294](https://openairdocs.org/ntsb/FTW85LA294.md): North American AT-6 · Port Isabel, TX · Accident · No injuries · Limited investigation · Final report · Aug 3, 1985 · N4434N · Substantial damage > The acft was substantially damaged when it undershot the runway and cartwheeled during an emergency landing following an engine failure in the traffic pattern. The plt reported that initial examination of the engine revealed that initial examination of the… - [NTSB LAX85LA250](https://openairdocs.org/ntsb/LAX85LA250.md): Rockwell S-2R · Colusa, CA · Accident · No injuries · Limited investigation · Final report · May 9, 1985 · N8929Q · Substantial damage > During an ag flight, the eng began to severly backfire & lose power. The plt attempted to make a forced ldg on the nearby duster airstrip but had insufficient altitude to be properly aligned with the rwy. The acft overan the edge of the end disclosed that its… - [NTSB SEA84LA199](https://openairdocs.org/ntsb/SEA84LA199.md): Rockwell Thrush SR2 · Nampa, ID · Accident · No injuries · Limited investigation · Final report · Aug 14, 1984 · N5553X · Substantial damage > The acft began to lose power while engaged in aerial application so the plt dumped his load and headed for the airstrip. Enroute the power deteriorated so the plt elected to land. Cutting the mixture gave the engine a surge which caused an overshoot into… - [NTSB MKC84LA250](https://openairdocs.org/ntsb/MKC84LA250.md): Grumman G-164A · Swifton, AR · Accident · No injuries · Limited investigation · Final report · Aug 14, 1984 · N7693 · Substantial damage > During a swath run the #9 cylinder on the radial engine separated. A forced landing was made during which the acft landed in a levee and nosed over. - [NTSB MKC84LA211](https://openairdocs.org/ntsb/MKC84LA211.md): Grumman G-164B · Roe, AR · Accident · No injuries · Limited investigation · Final report · Jul 17, 1984 · N8365K · Substantial damage > As a result of a supercharger failure, a partial power loss was experienced during a swath run. During the landing roll after a forced landing, the acft nosed over & came to rest inverted. An eng teardown revealed that both supercharger bearings had failed… - [NTSB MKC84LA217](https://openairdocs.org/ntsb/MKC84LA217.md): Grumman G-164A · Osceola, AR · Accident · No injuries · Limited investigation · Final report · Jul 13, 1984 · N7928 · Substantial damage > The acft crashed into a levee in a rice field after losing engine power during a spray operation turn-around. The enginedid not quit entirely but lost enough power so that flt was not maintained. An inspection of the engine revealed a broked connecting rod. Next page: https://openairdocs.org/ntsb.md?engine=52016&occurrence=352&page=2 ## 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 ('52016') AND EXISTS (SELECT 1 FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE o.case_mkey = x.case_mkey AND o.aircrafts_position = x.position AND o."occurrenceNumber" = 1 AND o."occurrenceCode" = 352)) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?engine=52016&occurrence=352 --- 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.