# NTSB investigations, OK: 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 DFW06LA078](https://openairdocs.org/ntsb/DFW06LA078.md): Cessna C-37 · Fittstown, OK · Accident · 1 fatal · Limited investigation · Final report · Mar 6, 2006 · N18045 · Destroyed > The loss of engine power due to a cracked cylinder head. A contributing factor was the lack of suitable terrain available to the pilot for the forced landing. - [NTSB FTW02LA021](https://openairdocs.org/ntsb/FTW02LA021.md): Cessna 152 · Bethany, OK · Accident · No injuries · Limited investigation · Final report · Oct 26, 2001 · N67797 · Substantial damage > the mechanic's failure to properly lock the exhaust valve's clearance adjusting screw locknut, which resulted in a loose nut, disabling of the exhaust valve pushrod, and a partial loss of engine power while in cruise flight. A contributing factor was the… - [NTSB FTW00LA107](https://openairdocs.org/ntsb/FTW00LA107.md): Cessna 172N · Maud, OK · Accident · No injuries · Limited investigation · Final report · Mar 24, 2000 · N75958 · Substantial damage > the loss of engine power while maneuvering as a result of the separation of the exhaust rocker arm retaining stud due to fatigue, which resulted in a precautionary landing. - [NTSB FTW99LA247](https://openairdocs.org/ntsb/FTW99LA247.md): Rockwell S-2R · Lookeba, OK · Accident · No injuries · Limited investigation · Final report · Sep 6, 1999 · N4919X · Destroyed > The loss of engine power resulting from a cylinder that failed for an undetermined reason. - [NTSB FTW99FA199](https://openairdocs.org/ntsb/FTW99FA199.md): Smith, Ted Aerostar Aerostar 601P · Bethany, OK · Accident · 2 fatal · Field investigation · Final report · Jul 23, 1999 · N345LS · Destroyed > The pilot's failure to maintain the minimum controllable airspeed. A factor was the disconnected rubber interconnect boot, which resulted in the partial loss of left engine power. - [NTSB FTW97LA117](https://openairdocs.org/ntsb/FTW97LA117.md): Grumman G-164 · Newkirk, OK · Accident · No injuries · Limited investigation · Final report · Mar 6, 1997 · N527Y · Substantial damage > The partial loss of engine power due to failure of the blower (integral supercharger). A factor was the power line over which the pilot had to maneuver during the forced landing which resulted in insufficient airspeed to flare the airplane. - [NTSB FTW94LA289](https://openairdocs.org/ntsb/FTW94LA289.md): Cessna 182L · Ardmore, OK · Accident · Minor injuries · Limited investigation · Final report · Sep 2, 1994 · N3413R · Substantial damage > The partial loss of power due to a cylinder head separation. Factors were the lack of suitable terrain for the forced landing and the low ceiling. - [NTSB FTW93LA216](https://openairdocs.org/ntsb/FTW93LA216.md): Cessna 172N · Purcell, OK · Accident · No injuries · Limited investigation · Final report · Jul 25, 1993 · N4884G · Substantial damage > The lack of suitable terrain onto which to execute the forced landing which was neccesitated by the partial power loss. The power loss was a result of the fatigue failure of the exhaust valve rocker arm attachment stud. A factor was the night conditions. - [NTSB FTW92LA134](https://openairdocs.org/ntsb/FTW92LA134.md): Air Tractor AT-501 · Mooreland, OK · Accident · No injuries · Limited investigation · Final report · May 14, 1992 · N1006T · Substantial damage > The failure of the number 3 cylinder for undetermined reasons. A factor was the lack of suitable terrain for the ensuing forced landing. - [NTSB CHI92FA127](https://openairdocs.org/ntsb/CHI92FA127.md): Cessna 172P · Kellyville, OK · Accident · 1 fatal · Field investigation · Final report · Apr 13, 1992 · N54736 · Destroyed > An inadvertent stall and misjudgement of an emergency procedure by the pilot in trying to stretch the forced landing approach to make it to the airstrip. - [NTSB FTW92LA096](https://openairdocs.org/ntsb/FTW92LA096.md): Burnett Teenie II · Edmond, OK · Accident · Minor injuries · Limited investigation · Final report · Feb 29, 1992 · N5749 · Substantial damage > Partial engine power loss due to cylinder failure. A factor was the lack of suitable terrain for the forced landing. - [NTSB FTW91FA081](https://openairdocs.org/ntsb/FTW91FA081.md): Cessna 150J · Caney, OK · Accident · 2 fatal · Field investigation · Final report · May 18, 1991 · N1019M · Destroyed > Binding of the #2 exhaust valve (stuck valve), and failure of the pilot to maintain adequate airspeed, which resulted in an inadvertent stall. A factor related to the accident was: the failed exhaust manifold gasket. - [NTSB FTW89FA107](https://openairdocs.org/ntsb/FTW89FA107.md): Pitts S-1S · Henryetta, OK · Accident · Serious injuries · Field investigation · Final report · Jun 2, 1989 · N64652 · Destroyed > An engine power loss due to the separation and departure of an exhaust stack. The stack failed due to poor weld. Factor(s) was: the terrain conditions of the selected forced landing site. - [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 FTW87DPJ06](https://openairdocs.org/ntsb/FTW87DPJ06.md): Air Tractor AT301 · El Dorado, OK · Accident · No injuries · Final report · Mar 22, 1987 · N3655G · Substantial damage > The pilot stated that during takeoff from a county road, black smoke started coming out of the engine exhaust. The aircraft then collided with a tree and a post causing substantial damage. It was found that the carburetor heat system had been modified and the… - [NTSB FTW87DPJ04](https://openairdocs.org/ntsb/FTW87DPJ04.md): Air Tractor 301 · Oluskee, OK · Accident · No injuries · Final report · Mar 14, 1987 · N8865S · Substantial damage > During aerial application the engine sustained a power loss due to separation of the number 9 cylinder head. During the forced landing in rough terrain the aircraft was substantially damaged. - [NTSB FTW86LA168](https://openairdocs.org/ntsb/FTW86LA168.md): Cessna T210M · Mc Alester, OK · Accident · Serious injuries · Limited investigation · Final report · Sep 14, 1986 · N7568M · Substantial damage > Sixty-six year old commercial pilot taking off from Mc Alester, OK airport. Pilot stated fuel pressure fluctuated followed by loss of power during initial climb. Pilot activated auxiliary fuel pumps and switched fuel tanks. Could not restore fuel pressure.… - [NTSB FTW86LA166](https://openairdocs.org/ntsb/FTW86LA166.md): Mooney M20E · Oklahoma City, OK · Accident · Minor injuries · Limited investigation · Final report · Sep 13, 1986 · N1250X · Substantial damage > The pilot apparently had neglected to check his engine oil supply before takeoff since there was no oil in the crankcase at the time of the accident. If five quarts of oil (the amount the pilot reportedly stated was in the engine at takeoff) had leaked out… - [NTSB FTW86FPJ09](https://openairdocs.org/ntsb/FTW86FPJ09.md): Quick Silver Mxii · Ardmore, OK · Accident · Serious injuries · Final report · Jun 20, 1986 · N4410W · Substantial damage > The acft landed short of the rwy after losing eng pwr during the apch. Post acc inspection showed that the bearing on the pwr shaft failed. This allowed the belt tension to become slack which reduced the prop RPM. No other discrepancies were noted. - [NTSB FTW86FA004](https://openairdocs.org/ntsb/FTW86FA004.md): Beech H18 · Oklahoma City, OK · Accident · 2 fatal · Field investigation · Final report · Nov 5, 1985 · N1461G · Destroyed > Atr plt departing arpt under VMC experienced failure of the right eng shortly after lift-off. The acft yawed right followed by a steep right roll, contacting power lines with the right wing and subsequently impacted the ground. A post-crash fire destoyed the… - [NTSB FTW85LPJ03](https://openairdocs.org/ntsb/FTW85LPJ03.md): James/Viking Dragonfly · Okmulgee, OK · Accident · No injuries · Final report · Aug 23, 1985 · N45CJ · Substantial damage > The acft bounced 3 times during a landing after the engine failed to preduce full power for takeoff. After the 3rd bounce the rt canard broke off at the fuselage. The plt stated that the fuel filter was found to be blocked by some type of residue. - [NTSB FTW85LA194](https://openairdocs.org/ntsb/FTW85LA194.md): Piper PA-31-350 · Sallisaw, OK · Accident · No injuries · Limited investigation · Final report · Apr 22, 1985 · N3550N · Substantial damage > An annual inspn had just been completed (4/22/85) & each eng had about 1 hr of flt time. The plt stated that he took off & climbed to cruise at 9000 ft, then closed the cowl flaps & set the fuel settings for 75% power. While en route, he noted oil trailing… - [NTSB FTW83FA149](https://openairdocs.org/ntsb/FTW83FA149.md): Piper PA-34-200 · Kingston, OK · Accident · 3 fatal · Field investigation · Final report · Mar 12, 1983 · N43480 · Destroyed > The acft rolled right after a premature liftoff due to a dip in the rwy. The acft continued to roll right until it impacted a 6 degree slope in a 100 degree nose down attitude. Investigation revealed that the right engine had suffered a power loss due to a… - [NTSB FTW82FPM15](https://openairdocs.org/ntsb/FTW82FPM15.md): Beech H35 · Tulsa, OK · Accident · 2 fatal · Final report · Aug 12, 1982 · N4800Y · Destroyed > Aircraft lost power during takeoff. Pilot tried to turn back to airport in a left bank described as 60 to 90 degrees. Aircraft stalled and crashed about 1300 feet east of takeoff point. During the investigation the fuel pump was placed on a flow bench & on… - [NTSB FTW82DA106](https://openairdocs.org/ntsb/FTW82DA106.md): Piper PA-28-235 · Tulsa, OK · Accident · Minor injuries · Final report · Mar 26, 1982 · N8904W · Substantial damage > The aircraft experienced a partial power loss during takeoff at an altitude of about 150 AGL. The pilot turned left with the intention of landing on a perpendicular taxiway. During the turn the aircraft developed a high sink-rate and struck the taxiway in a… ## 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" = 'OK' 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=OK --- 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.