# NTSB investigations, 1999: 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 LAX00FA061](https://openairdocs.org/ntsb/LAX00FA061.md): Aerospatiale AS-350D · Avalon, CA · Accident · Serious injuries · Field investigation · Final report · Dec 28, 1999 · N3593S · Destroyed
  > A loose pneumatic fitting caused the engine to go to flight idle power at a low altitude, which resulted in a forced landing in hilly terrain.
- [NTSB CHI00LA056](https://openairdocs.org/ntsb/CHI00LA056.md): Cessna 210 · South Lyon, MI · Accident · No injuries · Limited investigation · Final report · Dec 25, 1999 · N7493E · Substantial damage
  > the failure of the throttle and the unsuitable terrain encountered by the pilot in the taxi area. Factors were the collapsed nose gear and the rough terrain,
- [NTSB MIA00LA049](https://openairdocs.org/ntsb/MIA00LA049.md): Piper PA-32RT-300T · Fort Lauderdale, FL · Accident · Minor injuries · Limited investigation · Final report · Dec 13, 1999 · N21312 · Substantial damage
  > The failure of the pilot to maintain minimum flying airspeed, (Vso) during takeoff following a partial loss of engine power resulting in the aircraft stalling, an uncontrolled descent, and collision with trees. A factor in the accident was the failure of the…
- [NTSB DEN00GA022](https://openairdocs.org/ntsb/DEN00GA022.md): Bell 206 L-3 · Rifle, CO · Accident · No injuries · Final report · Nov 24, 1999 · N617DE · Substantial damage
  > a forced landing on rough, unsuitable terrain. A contributing factor was the partial loss of engine power, which resulted from improper maintenance by repair station personnel.
- [NTSB ATL00LA005](https://openairdocs.org/ntsb/ATL00LA005.md): Cessna 150F · Bay Springs, MS · Accident · Minor injuries · Limited investigation · Final report · Oct 29, 1999 · N6444F · Substantial damage
  > The pilot's failure to maintain flying speed that resulted in a loss of control and stall. A factor was a stuck exhaust valve.
- [NTSB LAX00LA020](https://openairdocs.org/ntsb/LAX00LA020.md): Cessna 150H · El Monte, CA · Accident · Minor injuries · Limited investigation · Final report · Oct 19, 1999 · N22795 · Substantial damage
  > A cracked No. 2 engine cylinder, which led to a loss of power. A factor was the ditch in the forced landing area.
- [NTSB DEN00FA007](https://openairdocs.org/ntsb/DEN00FA007.md): Gardner Varieze · Quemado, NM · Accident · 1 fatal · Field investigation · Final report · Oct 18, 1999 · N13WM · Substantial damage
  > The pilot's selection of an unsuitable landing area on which to make a precautionary landing, and his excessive airspeed during landing touchdown. Factors were the ingestion of the foam air filter into the throat of the injector, and the pilot's failure to…
- [NTSB NYC00LA008](https://openairdocs.org/ntsb/NYC00LA008.md): Piper PA-28R-200 · Berlin, MD · Accident · Serious injuries · Limited investigation · Final report · Oct 8, 1999 · N56094 · Substantial damage
  > The failure of the number 3-cylinder exhaust valve stem due to fatigue cracking.
- [NTSB FTW99FA262](https://openairdocs.org/ntsb/FTW99FA262.md): Beech A36TC · Franklinton, LA · Accident · 4 fatal · Field investigation · Final report · Sep 19, 1999 · N206WJ · Destroyed
  > The pilot's inadvertent stall while attempting to clear trees during a go-around. Factors were the pilot's misjudgment of the airplane's distance and speed during the precautionary landing and the partial loss of engine power due to a perforated piston.
- [NTSB ATL99LA130](https://openairdocs.org/ntsb/ATL99LA130.md): Cessna 182P · Summerville, GA · Accident · No injuries · Limited investigation · Final report · Sep 14, 1999 · N6863M · Substantial damage
  > The missing throttle linkage bolt from the carburetor due to an improper engine installation by maintenance personnel. Factors were the tailwind present during the landing roll and the trees.
- [NTSB MIA99FA252](https://openairdocs.org/ntsb/MIA99FA252.md): Boeing B737-300 · West Palm Beach, FL · Accident · No injuries · Field investigation · Final report · Sep 12, 1999 · N17356 · Substantial damage
  > The fatigue fracture and separation of the high pressure turbine forward rotating air seal due to a manufacturing defect in a bolt hole that was not detected by the engine manufacturer due to inadequate and ineffective inspection techniques. Contributing to…
- [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 FTW99LA241](https://openairdocs.org/ntsb/FTW99LA241.md): Cessna 414 · Alpine, TX · Accident · Minor injuries · Limited investigation · Final report · Aug 28, 1999 · N67JM · Destroyed
  > The pilot's improper use of the emergency fuel boost pump, which resulted in excessive fuel flow to the engine and subsequent total loss of left engine power. Factor's were the high density altitude, the pilot exceeding the airplane's weight and balance, the…
- [NTSB DEN99LA145](https://openairdocs.org/ntsb/DEN99LA145.md): Cessna 337 · Edgewood, NM · Accident · No injuries · Limited investigation · Final report · Aug 15, 1999 · N99MH · Substantial damage
  > Breakage of the safety wire that secured the propeller control cable to the support bracket. Factors were the inability of the pilot to feather the propeller or change propeller rpm, and rough, uneven, and unsuitable terrain on which to make a forced landing.
- [NTSB MIA99LA228](https://openairdocs.org/ntsb/MIA99LA228.md): William John Schulz WJS Jaybird · Tangerine, FL · Accident · No injuries · Limited investigation · Final report · Aug 10, 1999 · N735BS · Substantial damage
  > the pilot's improper torqueing of a rocker arm adjusting jam nut, that resulted in the adjuster loosening, and a partial loss of engine power. This resulted in the pilot making an off airport precautionary landing and subsequent nose over, during which the…
- [NTSB CHI99LA277](https://openairdocs.org/ntsb/CHI99LA277.md): Cessna 150M · Sikeston, MO · Accident · No injuries · Limited investigation · Final report · Aug 6, 1999 · N3755V · Substantial damage
  > the loss of engine power due to the stuck exhaust valve. A factor was the lack of suitable terrain available for the forced landing.
- [NTSB DEN99LA131](https://openairdocs.org/ntsb/DEN99LA131.md): Cessna T210F · Fairplay, CO · Accident · Serious injuries · Limited investigation · Final report · Jul 30, 1999 · N6125R · Substantial damage
  > A partial loss of engine power due to a partial failure of the turbocharger.
- [NTSB CHI99LA275](https://openairdocs.org/ntsb/CHI99LA275.md): Fairchild 24 C8C · La Fayette, IL · Accident · No injuries · Limited investigation · Final report · Jul 28, 1999 · N15345 · Substantial damage
  > the pilot's failure to obtain/maintain the proper descent rate. A factor to the accident was the partial loss of engine power as a result of the exhaust valve keeper becoming unlocked, which jammed the exhaust valve.
- [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 SEA99FA113](https://openairdocs.org/ntsb/SEA99FA113.md): Alexander VAN'S RV-8 · Lafayette, OR · Accident · 1 fatal · Field investigation · Final report · Jul 10, 1999 · N41VA · Destroyed
  > Fatigue of the number two connecting rod end resulting in a fracture at the rod end and release from the crankshaft, an ensuing in-flight fuel fed fire, followed by the pilot's abandoning the aircraft in flight. A contributing factor was pressure on the pilot…
- [NTSB SEA99LA107](https://openairdocs.org/ntsb/SEA99LA107.md): Grumman-Schweizer G-164A · New Plymouth, ID · Accident · No injuries · Limited investigation · Final report · Jul 7, 1999 · N7869 · Substantial damage
  > Loss of engine power due to failure of the supercharger impeller. A contributing factor was the ditch.
- [NTSB FTW99LA185](https://openairdocs.org/ntsb/FTW99LA185.md): Cessna 150M · Pocahontas, AR · Accident · No injuries · Limited investigation · Final report · Jul 7, 1999 · N7660U · Substantial damage
  > The failure of the carburetor heat control cable which resulted in a partial loss of engine power during initial takeoff climb. A factor was the lack of suitable terrain for the forced landing.
- [NTSB LAX99LA245](https://openairdocs.org/ntsb/LAX99LA245.md): Hughes 369D · Oakdale, CA · Accident · No injuries · Limited investigation · Final report · Jul 3, 1999 · N8661F · Substantial damage
  > The disintegration and failure of the oil pump drive spur gear aft bearing, which resulted in failure of the oil pump and subsequent oil starvation to the engine's turbine module. A factor in the accident was the failure of company maintenance personnel to…
- [NTSB ANC99LA082](https://openairdocs.org/ntsb/ANC99LA082.md): Maule M-4-220C · Mcgrath, AK · Accident · No injuries · Limited investigation · Final report · Jun 24, 1999 · N40677 · Substantial damage
  > A separation of the number 4 engine cylinder, and a fracture of the number 4 engine connecting rod.
- [NTSB FTW99LA168](https://openairdocs.org/ntsb/FTW99LA168.md): Cessna T188C · Panhandle, TX · Accident · No injuries · Limited investigation · Final report · Jun 11, 1999 · N9659J · Substantial damage
  > The partial loss of engine power as a result of the low compression in the number 5 cylinder. A factor was the lack of suitable terrain for the forced landing.
- [NTSB MIA99LA166](https://openairdocs.org/ntsb/MIA99LA166.md): Cessna 182E · Rolling Fork, MS · Accident · No injuries · Limited investigation · Final report · Jun 6, 1999 · N9267X · Substantial damage
  > Improper torqueing of the connecting rod bolts which resulted in the bolts being loose and rubbing in the dowel area which resulted in fatigue emanation and cracking and separation of the number 3 connecting rod after bolt failure.
- [NTSB CHI99FA163](https://openairdocs.org/ntsb/CHI99FA163.md): Cessna 421B · Jefferson City, MO · Accident · 4 fatal · Field investigation · Final report · May 27, 1999 · N34TM · Destroyed
  > the pilot failed to maintain control of the airplane. A factor was the partial loss of power due to the exhaust valve fatigue failure.
- [NTSB CHI99LA162](https://openairdocs.org/ntsb/CHI99LA162.md): Grumman-Schweizer G-164B · Buxton, ND · Accident · No injuries · Limited investigation · Final report · May 25, 1999 · N6524K · Substantial damage
  > the number one cylinder's separation, the pilot's visual lookout not possible through the oil given off by the number one cylinder, and the embankment. A factor in the accident was the oil.
- [NTSB ANC99LA060](https://openairdocs.org/ntsb/ANC99LA060.md): Aeronca 15AC · Pedro Bay, AK · Accident · Serious injuries · Limited investigation · Final report · May 8, 1999 · N1315H · Substantial damage
  > A separation of the number 3 engine cylinder head assembly, and a burned through fuel line.
- [NTSB MIA99LA137](https://openairdocs.org/ntsb/MIA99LA137.md): Beech A36 · Courtland, AL · Accident · Serious injuries · Limited investigation · Final report · Apr 21, 1999 · N769LW · Substantial damage
  > The failure of maintenance personnel from Signature Flight Support to assure that a cotter pin was installed at the air throttle assembly lever following installation of the overhauled fuel control valve onto the overhauled engine. This resulted in the…
- [NTSB MIA99LA117](https://openairdocs.org/ntsb/MIA99LA117.md): Waco YMF-5 · Boca Raton, FL · Accident · Serious injuries · Limited investigation · Final report · Apr 2, 1999 · N820MM · Substantial damage
  > The pilot's failure to select a suitable forced landing site following a partial loss of engine power due to failed cylinder holdddown studs, and the subsequent collision with trees. A factor in the accident was the reduced forward visibility from the dual…
- [NTSB DEN99LA061](https://openairdocs.org/ntsb/DEN99LA061.md): Mooney M20K · Medicine Bow, WY · Accident · No injuries · Limited investigation · Final report · Mar 28, 1999 · N12HW · Substantial damage
  > A fluctuating turbine inlet temperature and resulting loss of engine power for undetermined reasons. Factors were the rough, unsuitable terrain on which to make a forced landing.
- [NTSB FTW99LA085](https://openairdocs.org/ntsb/FTW99LA085.md): Eurocopter Colibri EC120B · Springtown, TX · Accident · Minor injuries · Limited investigation · Final report · Feb 26, 1999 · N122TH · Substantial damage
  > The improper touchdown executed by the pilot. Factors were the tail wind condition, and the manufacturer's inadequate design of the P3 pipe supports, which resulted in a fatigue fracture of the P3 pipe.
- [NTSB NYC99LA065](https://openairdocs.org/ntsb/NYC99LA065.md): Stinson 108-3 · Bristol, CT · Accident · No injuries · Limited investigation · Final report · Feb 21, 1999 · N6191M · Substantial damage
  > The partial loss of power due to the failure of a fatigued connecting rod bolt.
- [NTSB DEN99TA031](https://openairdocs.org/ntsb/DEN99TA031.md): Hughes 369D · Woodruff, UT · Accident · No injuries · Final report · Jan 4, 1999 · N5013P · Substantial damage
  > A partial loss of engine power due to erosion in the compressor assembly module. Factors were a missing rotating labyrinth seal, the installation of which had not been performed by unknown maintenance personnel.

## 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") = 1999
  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=1999

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