# NTSB investigations, 1994: 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 · 54 cases

## Latest cases

- [NTSB MIA95LA051](https://openairdocs.org/ntsb/MIA95LA051.md): Piper PA-28-161 · Lakeland, FL · Accident · No injuries · Limited investigation · Final report · Dec 31, 1994 · N4300S · Substantial damage
  > Fatigue failure of the engine no.1 valve spring that jammed the intake valve open resulting in partial loss of engine power.
- [NTSB LAX95LA064](https://openairdocs.org/ntsb/LAX95LA064.md): Rockwell S2R Thrush Cmdr · Yuma, AZ · Accident · No injuries · Limited investigation · Final report · Dec 29, 1994 · N8455V · Substantial damage
  > a forced landing due to an engine failure of the no.1 cylinder.
- [NTSB CHI95LA058](https://openairdocs.org/ntsb/CHI95LA058.md): Mooney M20K · Minneapolis, MN · Accident · No injuries · Limited investigation · Final report · Dec 28, 1994 · N3983H · Substantial damage
  > the pilot's misjudging of distance and airspeed during the approach to landing which resulted in an overrun. Factors associated with the accident were the separation of the exhaust pipe and the pilot's not understanding communications from the air traffic…
- [NTSB MIA95LA049](https://openairdocs.org/ntsb/MIA95LA049.md): Piper PA-22-150 · Tavares, FL · Accident · No injuries · Limited investigation · Final report · Dec 24, 1994 · N2829P · Substantial damage
  > The failure of the no.3 connecting rod resulting in a loss of engine power. The lack of suitable terrain for a forced landing was a factor.
- [NTSB MIA95LA048](https://openairdocs.org/ntsb/MIA95LA048.md): Piper PA-28-140 · La Belle, FL · Accident · No injuries · Limited investigation · Final report · Dec 23, 1994 · N41774 · Substantial damage
  > Partial loss of engine power due to total failure of the no. 3 cylinder exhaust valve for undetermined reasons. Also, unsuitable terrain encountered during the forced landing.
- [NTSB ATL95LA030](https://openairdocs.org/ntsb/ATL95LA030.md): Cessna 150G · Rhine, GA · Accident · No injuries · Limited investigation · Final report · Dec 23, 1994 · N3221J · Substantial damage
  > The failure of the number two cylinder rocker shaft bosses, which resulted in a loss of engine power, and an eventual emergency landing.
- [NTSB MIA95LA034](https://openairdocs.org/ntsb/MIA95LA034.md): Piper PA-28-140 · Fajardo, PR · Accident · No injuries · Limited investigation · Final report · Dec 4, 1994 · N404FL · Substantial damage
  > The malfunction of a magneto resulting in a partial loss of power over unsuitable terrain.
- [NTSB LAX95LA022](https://openairdocs.org/ntsb/LAX95LA022.md): Forney F-1 · Searchlight, NV · Accident · No injuries · Limited investigation · Final report · Oct 28, 1994 · N3019G · Substantial damage
  > the pilot's failure to maintain directional control by improperly compensating for the existing wind conditions. The leaking cylinder, the prevailing crosswind, the soft terrain, and the dirt bank were factors in this accident
- [NTSB LAX95LA008](https://openairdocs.org/ntsb/LAX95LA008.md): Rey Avid Flyer · Bakersfield, CA · Accident · Serious injuries · Limited investigation · Final report · Oct 15, 1994 · N827H · Destroyed
  > the inadequate maintenance on the engine's liquid cooling system fittings and lines.
- [NTSB CHI95LA008](https://openairdocs.org/ntsb/CHI95LA008.md): Cessna T210R · Lakota, ND · Accident · Minor injuries · Limited investigation · Final report · Oct 10, 1994 · CGHRG · Substantial damage
  > Partial loss of engine power due to preignition and/or detonation, which resulted in failure of the number 4 cylinder. The unfavorable tailwind for landing was a related factor.
- [NTSB BFO95LA003](https://openairdocs.org/ntsb/BFO95LA003.md): Piper PA-28-180 · Ebensburg, PA · Accident · Minor injuries · Limited investigation · Final report · Oct 10, 1994 · N8908J · Destroyed
  > The loss of partial engine power due to the failure of the right magneto's nylon gear on the rotating magnet and the low compression in the number three cylinder.
- [NTSB FTW95FA003](https://openairdocs.org/ntsb/FTW95FA003.md): Cessna T210M · Richmond, UT · Accident · 2 fatal · Field investigation · Final report · Oct 1, 1994 · N732VK · Destroyed
  > The loss of engine oil pressure due to an oil leak from a loose oil line fitting. Factors were the obscuration, and the unsuitable terrain at the pilot's disposal.
- [NTSB MIA94LA218](https://openairdocs.org/ntsb/MIA94LA218.md): Grumman G-164B · Greenwood, MS · Accident · No injuries · Limited investigation · Final report · Sep 29, 1994 · N48572 · Substantial damage
  > The improper decision of the pilot to execute a precautionary landing to an unprepared field due to a supercharger shaft failure.
- [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 CHI94LA332](https://openairdocs.org/ntsb/CHI94LA332.md): Cessna 170 · St. Anne, IL · Accident · No injuries · Limited investigation · Final report · Sep 18, 1994 · N4216V · Substantial damage
  > Engine failure due to an inadequately reconditioned cylinder.
- [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 ANC94LA129](https://openairdocs.org/ntsb/ANC94LA129.md): Piper PA-18 · Tok, AK · Accident · No injuries · Limited investigation · Final report · Sep 2, 1994 · N8597D · Substantial damage
  > The worn cam shaft lobe and worn valve lifter.
- [NTSB FTW94FA282](https://openairdocs.org/ntsb/FTW94FA282.md): Cessna 402 · Harlingen, TX · Accident · Minor injuries · Field investigation · Final report · Aug 28, 1994 · N966JW · Substantial damage
  > The pilot's failure to maintain airspeed resulting in an inadvertent stall. Factors were a partial loss of power on all engines due to worn and fouled spark plugs and inadequate maintenance by company maintenance personnel, aircraft weight beyond limitations,…
- [NTSB BFO94LA155](https://openairdocs.org/ntsb/BFO94LA155.md): Hughes 369D · Butler, PA · Accident · No injuries · Limited investigation · Final report · Aug 28, 1994 · N5027P · Substantial damage
  > The malfunction of the emergency fuel vent and the exhaustion of the fuel supply which resulted in the loss of engine power.
- [NTSB BFO94LA145](https://openairdocs.org/ntsb/BFO94LA145.md): Mooney M-20B · Marion, OH · Accident · No injuries · Limited investigation · Final report · Aug 23, 1994 · N778R · Substantial damage
  > Inadequate maintenance which resulted in the throttle cable becoming disconnected from the carburetor.
- [NTSB LAX94LA313](https://openairdocs.org/ntsb/LAX94LA313.md): Schweizer G-164-A · Laton, CA · Accident · No injuries · Limited investigation · Final report · Aug 11, 1994 · N699Y · Substantial damage
  > failure of the No.7 cylinder for an unspecified reason.
- [NTSB LAX94FA317](https://openairdocs.org/ntsb/LAX94FA317.md): Aerospatiale AS350-D · Kukuihaele, HI · Accident · No injuries · Field investigation · Final report · Aug 11, 1994 · N889AT · Substantial damage
  > a fatigue crack in the 'T' fitting on the power turbine governor pneumatic accumulator. A factor was the rough, rock-covered landing area.
- [NTSB ATL94LA150](https://openairdocs.org/ntsb/ATL94LA150.md): Cessna 150J · Waxhaw, NC · Accident · No injuries · Limited investigation · Final report · Aug 3, 1994 · N60182 · Destroyed
  > A loss of engine power due to a stuck, and worn, exhaust valve, and the inadequate inspection of the engine by other maintenance personnel. A factor was the trees at the forced landing area.
- [NTSB MIA94LA188](https://openairdocs.org/ntsb/MIA94LA188.md): Piper J5C · Yazoo City, MS · Accident · Minor injuries · Limited investigation · Final report · Jul 30, 1994 · N74669 · Substantial damage
  > Partial blockage of the carburetor by a wasp nest, which was not visible during preflight, and which resulted in the loss of power.
- [NTSB LAX94LA298](https://openairdocs.org/ntsb/LAX94LA298.md): Grumman AA-1B · Corona, CA · Accident · Minor injuries · Limited investigation · Final report · Jul 27, 1994 · N8972L · Substantial damage
  > An undetermined partial loss of engine power.
- [NTSB CHI94LA243](https://openairdocs.org/ntsb/CHI94LA243.md): Inman Acro Sport 1 · Albert Lea, MN · Accident · Serious injuries · Limited investigation · Final report · Jul 23, 1994 · N869M · Substantial damage
  > the pilot's failure to make a precautionary landing on the remaining runway. Factors in the accident were the blocked fuel injector and inadvertent stall.
- [NTSB CHI94LA242](https://openairdocs.org/ntsb/CHI94LA242.md): Grumman FM-2 · Woodburn, IN · Accident · No injuries · Limited investigation · Final report · Jul 22, 1994 · L1PP · Substantial damage
  > the total failure of the throttle linkage arm.
- [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 MIA94LA177](https://openairdocs.org/ntsb/MIA94LA177.md): Cessna 172M · Tampa, FL · Accident · No injuries · Limited investigation · Final report · Jul 9, 1994 · N5233R · Substantial damage
  > The pilot-in-command's improper approach during a forced landing following partial loss of engine power. The loss of engine power was a factor.
- [NTSB ATL94LA133](https://openairdocs.org/ntsb/ATL94LA133.md): Pilatus PC-6/B1-H2 · Raeford, NC · Accident · Minor injuries · Limited investigation · Final report · Jul 9, 1994 · N111FX · Destroyed
  > The improper inspection of the aircraft by company maintenance personnel, which resulted in an unsafetied and disconnected fuel control arm.
- [NTSB CHI94DCJ02](https://openairdocs.org/ntsb/CHI94DCJ02.md): Mueller Q2 · Utica, NE · Accident · Minor injuries · Final report · Jun 25, 1994 · N524WM · Destroyed
  > The failure of the carburetor float valve. A related factor is the high vegetation at the landing site.
- [NTSB LAX94LA260](https://openairdocs.org/ntsb/LAX94LA260.md): Mooney M20J · Big Bear, CA · Accident · No injuries · Limited investigation · Final report · Jun 20, 1994 · N201NK · Substantial damage
  > a loss of engine power from a malfunctioning magneto due to a loose oil seal in an overhauled magneto.
- [NTSB FTW94GA204](https://openairdocs.org/ntsb/FTW94GA204.md): Hughes 269C · London, TX · Accident · Minor injuries · Final report · Jun 20, 1994 · N7404F · Destroyed
  > The partial power loss due to a sticking valve. Factors were the remaining worn lobes on the camshaft and the lack of suitable terrain onto which a successful forced landing could be executed.
- [NTSB MIA94LA159](https://openairdocs.org/ntsb/MIA94LA159.md): Hruby Cayuse · Bay St. Louis, MS · Accident · 1 fatal · Limited investigation · Final report · Jun 12, 1994 · N12057 · Destroyed
  > The pilot-in-command's attempt to continue the takeoff when the engine was not producing full power and his attempt to reverse course to return to the airport without sufficient altitude to complete the turn.
- [NTSB SEA94LA138](https://openairdocs.org/ntsb/SEA94LA138.md): Siai-Marchetti SF.260B · Prospect, OR · Accident · No injuries · Limited investigation · Final report · Jun 6, 1994 · N943TA · Substantial damage
  > The fracture of a connecting rod. Factors include no suitable forced landing site, and a fence and irrigation system in the field where the forced landing took place.
- [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 LAX94LA225](https://openairdocs.org/ntsb/LAX94LA225.md): Staudacher 300S · Chandler, AZ · Accident · Serious injuries · Limited investigation · Final report · May 28, 1994 · N791S · Substantial damage
  > The operation of the engine at an RPM setting that exceeded the original design specifications and resulted in the failure of the no. 5 connecting rod bearing.
- [NTSB SEA94LA120](https://openairdocs.org/ntsb/SEA94LA120.md): Cessna 150L · Rio Linda, CA · Accident · Serious injuries · Limited investigation · Final report · May 19, 1994 · N6747G · Destroyed
  > The pilot's improper mixture leaning procedure. Factor(s) were: the disconnected ignition lead, dark night conditions, unsuitable terrain and the fence.
- [NTSB NYC94FA082](https://openairdocs.org/ntsb/NYC94FA082.md): Mooney M20K · Swanton, OH · Accident · 2 fatal · Field investigation · Final report · May 17, 1994 · N1007A · Destroyed
  > Failure of an engine cylinder which resulted in the loss of engine power and the pilot's failure to establish the proper descent path to an airport that was within the glide distance of the airplane. A factor was the overgross weight condition of the airplane.
- [NTSB CHI94LA156](https://openairdocs.org/ntsb/CHI94LA156.md): Cessna 150F · Chippewa Falls, WI · Accident · No injuries · Limited investigation · Final report · May 12, 1994 · N6872F · Substantial damage
  > the loss of engine power due to a binding carburetor heat door.
- [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 LAX94FA211](https://openairdocs.org/ntsb/LAX94FA211.md): Aero Commander 100 · Ocotillo Wells, CA · Accident · 1 fatal · Field investigation · Final report · May 4, 1994 · N3661X · Destroyed
  > the failure of the pilot to maintain flying speed after experiencing a partial power failure while maneuvering. A factor in the accident was the failure of the pilot to drain accumulated water from the aircraft fuel system during the preflight inspection.
- [NTSB MIA94LA127](https://openairdocs.org/ntsb/MIA94LA127.md): Cessna 170A · Bushnell, FL · Accident · Minor injuries · Limited investigation · Final report · Apr 26, 1994 · N9530A · Substantial damage
  > The pilot-in-command's improper landing flare during a forced landing, resulting in a hard landing and separation of the right main landing gear. Contributing to the accident was a partial loss of engine power due to a loose exhaust valve seat on the No. 3…
- [NTSB LAX94LA189](https://openairdocs.org/ntsb/LAX94LA189.md): Piper PA-28-140 · Hesperia, CA · Accident · No injuries · Limited investigation · Final report · Apr 16, 1994 · N4129J · Substantial damage
  > Loss of engine power due to an air leak at the gascolator gasket, which was improperly installed during maintenance. Darkness was a related factor.
- [NTSB NYC94LA074](https://openairdocs.org/ntsb/NYC94LA074.md): Piper PA-28R-200 · White Plains, NY · Accident · No injuries · Limited investigation · Final report · Apr 4, 1994 · N5335T · Substantial damage
  > The partial loss of engine power as the result of a disconnected throttle cable, and the subsequent forced landing and ditching in water to avoid collision with trees.
- [NTSB FTW94LA115](https://openairdocs.org/ntsb/FTW94LA115.md): Piper PA-28-140 · San Angelo, TX · Accident · No injuries · Limited investigation · Final report · Apr 2, 1994 · N3521K · Substantial damage
  > The partial loss of engine power. A factor was the lack of suitable terrain.
- [NTSB ANC94IA049](https://openairdocs.org/ntsb/ANC94IA049.md): Cessna 207 · Anchorage, AK · Incident · Minor injuries · Incident investigation · Final report · Mar 28, 1994 · N29CF · Minor damage
  > The partial failure of the no. 4 piston from over temperature (detonation).
- [NTSB MIA94LA103](https://openairdocs.org/ntsb/MIA94LA103.md): Cessna 172RG · Boca Raton, FL · Accident · No injuries · Limited investigation · Final report · Mar 26, 1994 · N9781B · Substantial damage
  > The failure of the aircraft operator to comply with engine manufacturers service bulletins which resulted in improper inspection of exhaust valves and subsequent sticking of the no. 4 exhaust valve.
- [NTSB LAX94FA165](https://openairdocs.org/ntsb/LAX94FA165.md): Ayres S-2R · Reno, NV · Accident · 2 fatal · Field investigation · Final report · Mar 16, 1994 · N40237 · Destroyed
  > An undetermined problem with the engine oil system, a decision to fly the airplane with a known deficiency, and progressive (partial) failure of the engine master rod and bearing.
- [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.

Next page: https://openairdocs.org/ntsb.md?year=1994&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 year(c."eventDate") = 1994
  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&year=1994

---
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.