# NTSB investigations, WA: 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. ## Latest cases - [NTSB SEA05LA138](https://openairdocs.org/ntsb/SEA05LA138.md): Bell 47G-2A · Oroville, WA · Accident · No injuries · Limited investigation · Final report · Jul 5, 2005 · N38926 · Substantial damage > The failure of the throttle cable housing, which permitted the engine's RPM to decay to the idle position. Contributing factors were the trees and the lack of suitable terrain for a forced landing. - [NTSB SEA04LA064](https://openairdocs.org/ntsb/SEA04LA064.md): Grumman G-44 · Belliigham, WA · Accident · No injuries · Limited investigation · Final report · Apr 2, 2004 · N65914 · Substantial damage > The failure of the pilot to select the proper touchdown point while conducting a forced landing. Factors included the #1 engine malfunction, the right propeller oil control valve leak, and the shallow subsurface terrain condition. - [NTSB SEA03LA156](https://openairdocs.org/ntsb/SEA03LA156.md): Hughes 269C · Marblemount, WA · Accident · No injuries · Limited investigation · Final report · Jul 25, 2003 · N500HS · Substantial damage > The partial failure of a magneto during hover taxi over water, leading to a forced landing in shallow water near the shoreline. Factors include the aircraft being over a lake at the time that the partial loss of power made it impossible to keep it airborne. - [NTSB SEA03LA076](https://openairdocs.org/ntsb/SEA03LA076.md): Fokker F27MK 600 · Port Townsend, WA · Accident · No injuries · Limited investigation · Final report · Apr 17, 2003 · N730FE · Substantial damage > The failure of the accessory drive shaft due to deterioration of bearing number 1 in the aft fork of the universal joint for undetermined reasons during cruise flight. - [NTSB SEA03FA026](https://openairdocs.org/ntsb/SEA03FA026.md): Cessna 172K · Gig Harbor, WA · Accident · No injuries · Field investigation · Final report · Jan 14, 2003 · N1909V · Substantial damage > The loss of engine power in the climb due to the fracture of the number seven engine crankshaft cheek due to the propagation of a fatigue crack initiation point. Factors include a vehicle pulling onto the road that the pilot selected for his forced emergency… - [NTSB SEA97LA186](https://openairdocs.org/ntsb/SEA97LA186.md): Cessna 172M · Langley, WA · Accident · No injuries · Limited investigation · Final report · Aug 5, 1997 · N73158 · Substantial damage > A failed exhaust valve. Factors were tailwind and excessive airspeed during the ensuing forced landing.. - [NTSB SEA94LA242](https://openairdocs.org/ntsb/SEA94LA242.md): Cessna P206D · Lopez, WA · Accident · Minor injuries · Limited investigation · Final report · Sep 18, 1994 · N8761Z · Substantial damage > A worn throttle control lever. - [NTSB SEA94LA143](https://openairdocs.org/ntsb/SEA94LA143.md): Wray KR-2 · Puyallup, WA · Accident · No injuries · Limited investigation · Final report · May 28, 1994 · N786RW · Substantial damage > An improperly functioning fuel boost pump. - [NTSB SEA94LA082](https://openairdocs.org/ntsb/SEA94LA082.md): Cessna 185 · Fort Lewis, WA · Accident · No injuries · Limited investigation · Final report · Mar 13, 1994 · N4732E · Substantial damage > The fuel shutoff valve seized in a partially open position. - [NTSB SEA93LA181](https://openairdocs.org/ntsb/SEA93LA181.md): Hiller UH-12E · Auburn, WA · Accident · No injuries · Limited investigation · Final report · Aug 23, 1993 · N9785C · Substantial damage > Failure of the connecting rod bolt. The high vegetation was a factor. - [NTSB SEA93LA092](https://openairdocs.org/ntsb/SEA93LA092.md): Taylorcraft BL-65 · Spokane, WA · Accident · Minor injuries · Limited investigation · Final report · Apr 10, 1993 · N29553 · Substantial damage > Failure of the number 4 cylinder exhaust valve seat and the inadvertent stalling of the aircraft by the pilot in command. Factors contributing to the accident were buildings and power lines. - [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 SEA91LA249](https://openairdocs.org/ntsb/SEA91LA249.md): Cessna 177 · Snohomish, WA · Accident · No injuries · Limited investigation · Final report · Sep 23, 1991 · N3314T · Substantial damage > The separation of the mixture control cable (core) resulting from separation of the adel clamp assembly and improper adjustment by maintenance personnel. - [NTSB SEA90FA057](https://openairdocs.org/ntsb/SEA90FA057.md): Cessna 170 · Republic, WA · Accident · 2 fatal · Field investigation · Final report · Mar 25, 1990 · N4130V · Destroyed > Improper inspection and airworthiness certification of the aircraft on the last annual inspection by an FAA authorized repair station, the inadequate engine performance and low cylinder compression, and the pilots attempt to takeoff with known aircraft… - [NTSB SEA89LA093](https://openairdocs.org/ntsb/SEA89LA093.md): Piper PA-22-150 · Black Diamond, WA · Accident · No injuries · Limited investigation · Final report · May 28, 1989 · N6121D · Substantial damage > Power loss due to magneto failure. Contributing to the accident were lack of suitable terrain for forced landing and the presence of obstacles. - [NTSB SEA89LA073](https://openairdocs.org/ntsb/SEA89LA073.md): Donner/Parton Avid Flyer · Stanwood, WA · Accident · No injuries · Limited investigation · Final report · Apr 20, 1989 · N4409D · Substantial damage > An ignition lead became disconnected from one cylinder, which resulted in a partial power loss. A factor related to the accident was: soft terrain in the touchdown area. - [NTSB SEA89LA059](https://openairdocs.org/ntsb/SEA89LA059.md): Grumman-Schweizer G-164A · Rosalia, WA · Accident · No injuries · Limited investigation · Final report · Mar 25, 1989 · N8792H · Substantial damage > A loss of engine power due to a supercharger failure. Contributing to the accident was the soft terrain on which the forced landing was made. - [NTSB SEA88LA148](https://openairdocs.org/ntsb/SEA88LA148.md): Weatherly 620 · Wilbur, WA · Accident · No injuries · Limited investigation · Final report · Aug 8, 1988 · N4603G · Substantial damage > The pilot reported that an engine power loss occurred during an aerial application maneuver. The pilot made a forced landing in rough terrain. Examination of the engine revealed deteriorated seals in the engine driven fuel pump. Exam of the electric fuel pump… - [NTSB SEA88LA071](https://openairdocs.org/ntsb/SEA88LA071.md): Cessna 172XP · Walla Walla, WA · Accident · No injuries · Limited investigation · Final report · Apr 10, 1988 · N736KG · Substantial damage > During descent for landing the pilot noted a surge coming from the engine area, accompanied by an increase in rpm's. both the oil temperature and the oil pressure gauges were reading zero. The cylinder head temperature had reached 500 degrees and smoke was… - [NTSB SEA87LA111](https://openairdocs.org/ntsb/SEA87LA111.md): de Havilland DHC-2 MK.1 · Sedro Woolley, WA · Accident · Minor injuries · Limited investigation · Final report · Jun 8, 1987 · N64384 · Destroyed > Shortly after takeoff a loss of power occurred and the aircraft struck trees in flight. Less than 1/2 fuel was available in all three fuel tanks. The fuel selector valve was tested and found that the selections plate was indexed off center for all selections… - [NTSB SEA86LA237](https://openairdocs.org/ntsb/SEA86LA237.md): Cessna 150L · Kent, WA · Accident · No injuries · Limited investigation · Final report · Sep 3, 1986 · N18079 · Substantial damage > During an instructional flight a partial loss of power occurred due to the mixture control cable at the carburetor end becoming loose. During forced landing on a field, two railroad ties, on a dirt pile, were struck. It was dusk at the time of the accident. - [NTSB SEA86LA226](https://openairdocs.org/ntsb/SEA86LA226.md): Hegsted S16B · Kelso, WA · Accident · No injuries · Limited investigation · Final report · Aug 27, 1986 · N10LH · Substantial damage > The student pilot was on final when the engine ceased operating. A forced landing was accomplished with touchdown being about 100 yards short of the runway. A hard landing was made with the aircraft coming to rest inverted. The needle valve to the carburetor… - [NTSB SEA86LA208](https://openairdocs.org/ntsb/SEA86LA208.md): Curtiss JN4-D · Vancouver, WA · Accident · Minor injuries · Limited investigation · Final report · Aug 17, 1986 · N511JN · Substantial damage > The plt reported a normal takeoff was made with 1300 RPM. At liftoff a small amount of black smoke emitted from both exhaust stacks and the RPM dropped to 1250. After clearing the rwy, more black smoke emitted and the RPM dropped to 1200. The plt cleared two… - [NTSB SEA86LA187](https://openairdocs.org/ntsb/SEA86LA187.md): Boeing PT13/17 · Vancouver, WA · Accident · No injuries · Limited investigation · Final report · Jul 31, 1986 · N1307N · Substantial damage > The plt reported the engine started running rough near woodland, Washington and an approach was set up, but due to many aircraft in the pattern the pilot elected to go to scappose, Washington (about 10 NM south of woodland). At scappose, Washington the pilot… - [NTSB SEA85LA076](https://openairdocs.org/ntsb/SEA85LA076.md): Weatherly 201B · Davenport, WA · Accident · No injuries · Limited investigation · Final report · Mar 15, 1985 · N1263W · Substantial damage > A vibration started in the engine and while the plt was monitoring the engine gauges he noted a loss of all oil pressure. A landing was made on a field and during rollout the left main gear was torn off when it struck a mound of dirt. The acft then struck… - [NTSB SEA84IA233](https://openairdocs.org/ntsb/SEA84IA233.md): Boeing 747-200B · Seattle, WA · Incident · No injuries · Incident investigation · Final report · Sep 29, 1984 · N613US · Minor damage > During climbout, passing thru 4000 ft MSL, the acft experienced a failure of the #2 engine. The crew reported hearing an explosive sound followed by a drop in fuel flow with N1 speed decreasing to 30% RPM on the #2 engine. The acft returned to Seattle for an… - [NTSB SEA84LA153](https://openairdocs.org/ntsb/SEA84LA153.md): Hughes 269C · Mt. St. Helens, WA · Accident · Minor injuries · Limited investigation · Final report · Jul 2, 1984 · N58397 · Destroyed > This accident occurred at the 5500 ft level on Mt. St. Helens. Density alt at the time was 7500 ft. at aprx 40-50 ft aglengine and rotor RPM began to decay rapidly. The acft landed hard on a rock ledge with one skid partially off the ledge. As rotor RPM… - [NTSB SEA84LA130](https://openairdocs.org/ntsb/SEA84LA130.md): Ayres S2R-1820 · Pasco, WA · Accident · No injuries · Limited investigation · Final report · Jun 12, 1984 · N4025K · Substantial damage > The plt was applying herbicides to a corn field when a power loss to idle RPM occurred. During an emergency landing, the main gear sunk into soft sand & the acft nosed over. An exam revealed that the throttle bracket, p/n 19703-5001, had failed. - [NTSB SEA84LA027](https://openairdocs.org/ntsb/SEA84LA027.md): Cessna 150F · Prosser, WA · Accident · No injuries · Limited investigation · Final report · Dec 17, 1983 · N6841F · Substantial damage > According to the pilot shortly after departure the engine began running rough for the second time. The pilot elected to make a precautionary landing on a gravel road he was familiar with. During the landing flare, with a gusty crosswind, directional control… - [NTSB SEA84LA019](https://openairdocs.org/ntsb/SEA84LA019.md): Morton B8M · Shelton, WA · Accident · No injuries · Limited investigation · Final report · Nov 9, 1983 · N37860 · Substantial damage > The acrt collided with fir trees, about 18 feet tall, during an off-arpt forced landing after a power loss. The plt suspected carburetor ice. He said the engine began to run rough and RPM dropped to about 1200/1500 RPM. When he was unable to clear the trees… - [NTSB SEA83LA146](https://openairdocs.org/ntsb/SEA83LA146.md): Piper PA-38-112 · Dixie, WA · Accident · No injuries · Limited investigation · Final report · Jul 11, 1983 · N4461E · Substantial damage > About an hour after departure the engine began to run rough. The pilot did a magneto check and noted a drop of 300 RPM. A precautionary landing was made into a field of tall wheat. During landing roll the left main landing gear struck a hole. Examination of… - [NTSB SEA82DA139](https://openairdocs.org/ntsb/SEA82DA139.md): Enstrom F280 · Seattle, WA · Accident · No injuries · Final report · Aug 9, 1982 · N267Q · Substantial damage > Helicopter made an emergency forced landing after power loss aircraft landed heavily in loose dirt and damaged skids and rotors. Post-accident exam found "throttle activating arm was improperly engaged to throttle stop." - [NTSB SEA82DA082](https://openairdocs.org/ntsb/SEA82DA082.md): Hughes 269A · 2nm Nnm Redmond, WA · Accident · No injuries · Final report · Jun 9, 1982 · N8730F · Substantial damage > The engine lost power during the climb and the pilot executed an autorotation. Upon landing the aircraft rocked back and the main rotor severed the tail boom. ## 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" = 'WA' AND c."eventCountry" = 'USA' AND c."mKey" IN (SELECT o.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o WHERE 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?occurrence=352&state=WA --- 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.