# NTSB investigations, CO: Loss of engine power(total) - 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 · 78 cases

## Latest cases

- [NTSB DEN08IA044](https://openairdocs.org/ntsb/DEN08IA044.md): Piper PA-46-310P · Aspen, CO · Incident · No injuries · Incident investigation · Final report · Dec 26, 2007 · N47BC · Minor damage
  > The failure of the crankshaft due to fatigue. The fatigue crack initiation was not determined.
- [NTSB DEN07LA122](https://openairdocs.org/ntsb/DEN07LA122.md): Beech C-45H · Longmont, CO · Accident · Serious injuries · Limited investigation · Final report · Jul 19, 2007 · N9562Z · Destroyed
  > The instructor pilot's improper preflight in that he failed to close the rocker box recovery system drain valves, resulting in a total loss of lubricating oil and subsequent oil starvation to both engines. A contributing factor was the trees.
- [NTSB DEN05LA070](https://openairdocs.org/ntsb/DEN05LA070.md): Ross/Stonecipher Vans RV-6 · Longmont, CO · Accident · No injuries · Limited investigation · Final report · Apr 22, 2005 · N345JE · Substantial damage
  > the loss of engine power due to oil starvation. A contributing factor was the contamination in the inverted oil system's separator.
- [NTSB DEN04FA064](https://openairdocs.org/ntsb/DEN04FA064.md): Cessna 150H · Boulder, CO · Accident · Minor injuries · Field investigation · Final report · Apr 18, 2004 · N105DP · Substantial damage
  > the failed magneto and the lack of suitable terrain (lake) for a forced landing.
- [NTSB DEN03LA050](https://openairdocs.org/ntsb/DEN03LA050.md): Piper PA-28R-200 · Delta, CO · Accident · No injuries · Limited investigation · Final report · Mar 13, 2003 · N16438 · Substantial damage
  > the loss of engine power due to company maintenance personnel's inadequate major engine overhaul (an oil pressure fitting in the engine accessory drive case had not been capped). Contributing factors were the loss of engine oil, and lack of suitable terrain…
- [NTSB DEN03FA025](https://openairdocs.org/ntsb/DEN03FA025.md): Cessna 421 · Akron, CO · Accident · 2 fatal · Field investigation · Final report · Dec 25, 2002 · N421D · Destroyed
  > The fractured connecting rods and the pilot not maintaining aircraft control following the engine failure. Factors contributing to the accident were the low altitude, the pilot not maintaining minimum controllable airspeed following the engine failure, the…
- [NTSB DEN01LA127](https://openairdocs.org/ntsb/DEN01LA127.md): Piper PA-28-140 · Calhan, CO · Accident · No injuries · Limited investigation · Final report · Jul 21, 2001 · N6276W · Substantial damage
  > the loss of engine power due to fuel contamination (water). A contributing factor was the lack of suitable terrain on which to perform a forced landing.
- [NTSB DEN01LA103](https://openairdocs.org/ntsb/DEN01LA103.md): Hall Lancair 4P · Bennett, CO · Accident · Minor injuries · Limited investigation · Final report · May 28, 2001 · N707SH · Substantial damage
  > unsuitable terrain on which to make a forced landing. A contributing factor was a fatigue fracture of the starter adapter drive shaft, which resulted in a loss of engine power due to oil starvation.
- [NTSB DEN00LA167](https://openairdocs.org/ntsb/DEN00LA167.md): Cessna R172K · Aurora, CO · Accident · Minor injuries · Limited investigation · Final report · Sep 10, 2000 · N1036V · Substantial damage
  > The unsuitable terrain for a forced landing. Contributing factors were the total loss of engine power due to the failure of the engine oil pump and the dark night light conditions.
- [NTSB DEN00LA122](https://openairdocs.org/ntsb/DEN00LA122.md): Rowley P-40F · Peyton, CO · Accident · 1 fatal · Limited investigation · Final report · Jul 3, 2000 · N42915 · Destroyed
  > the pilot's inadequate decision to turn back (low altitude) towards the runway for a forced landing. A contributing factor was the total loss of engine power due to a reduction gear failure.
- [NTSB DEN00IA093](https://openairdocs.org/ntsb/DEN00IA093.md): Piper PA-32R-300 · Erie, CO · Incident · No injuries · Incident investigation · Final report · May 22, 2000 · N424TP · Minor damage
  > Improper installation of cylinders by unknown maintenance personnel who failed to torque the cylinder stud nuts sufficiently.
- [NTSB DEN00LA072](https://openairdocs.org/ntsb/DEN00LA072.md): Weatherly 201B · Rocky Ford, CO · Accident · Minor injuries · Limited investigation · Final report · Apr 8, 2000 · N1292W · Substantial damage
  > A total loss of power due to an engine rocker arm failure and soft/unsuitable terrain during the subsequent forced landing.
- [NTSB DEN00IA076](https://openairdocs.org/ntsb/DEN00IA076.md): Beech A60 · Englewood, CO · Incident · No injuries · Incident investigation · Final report · Apr 8, 2000 · N928PT · Minor damage
  > The failure of a number one cylinder connecting rod bolt due to under-torquing during engine major overhaul.
- [NTSB DEN00IA052](https://openairdocs.org/ntsb/DEN00IA052.md): Cessna TR182 · Fort Carson, CO · Incident · No injuries · Incident investigation · Final report · Feb 17, 2000 · N155HC · No damage
  > The pilot electing to fly the aircraft with known deficiencies which resulted in a catastrophic engine failure. Factors were a connecting rod failure, and low engine oil level.
- [NTSB DEN00IA075](https://openairdocs.org/ntsb/DEN00IA075.md): Beech A60 · Boulder, CO · Incident · No injuries · Incident investigation · Final report · Nov 9, 1999 · N457DA · Minor damage
  > The fatigue failure of the #6 cylinder connecting rod cap.
- [NTSB DEN99LA160](https://openairdocs.org/ntsb/DEN99LA160.md): Bell UH-1H · Silverton, CO · Accident · Minor injuries · Limited investigation · Final report · Sep 6, 1999 · N4085L · Substantial damage
  > The total loss of engine power for undetermined reasons. A factor was the lack of suitable terrain for a forced landing.
- [NTSB DEN99IA038](https://openairdocs.org/ntsb/DEN99IA038.md): British Aerospace BAE 146-200A · Aspen, CO · Incident · No injuries · Incident investigation · Final report · Feb 12, 1999 · N608AW · Minor damage
  > The inadequate maintenance overhaul of the number four turbine disc by the manufacturer. A factor was the turbine blade's failure due to high cycle fatigue fracture.
- [NTSB FTW98LA350](https://openairdocs.org/ntsb/FTW98LA350.md): Piper PA-31-350 · Alamosa, CO · Accident · No injuries · Limited investigation · Final report · Aug 8, 1998 · N27196 · Substantial damage
  > Improper major overhaul of the engine by the overhaul facility. Factors were failure of the V-band clamp, the melting of the baffle and manifold clamp, and the pilot not being able to extend the landing gear.
- [NTSB FTW98LA183](https://openairdocs.org/ntsb/FTW98LA183.md): Enstrom 280C · Castle Rock, CO · Accident · No injuries · Limited investigation · Final report · Apr 16, 1998 · N5693D · Substantial damage
  > Malfunction of the engine-driven fuel pump. Factors were unsuitable terrain, soft ground, and a berm.
- [NTSB FTW97LA202](https://openairdocs.org/ntsb/FTW97LA202.md): Piper PA-25-235 · Lamar, CO · Accident · No injuries · Limited investigation · Final report · May 27, 1997 · N4829Y · Substantial damage
  > Failure of the left magneto and crank shaft idler drive gears. Factors were failure to perform a 100 hour inspection and unsuitable terrain for a forced landing.
- [NTSB FTW97LA189](https://openairdocs.org/ntsb/FTW97LA189.md): Townsend Kitfox · Greeley, CO · Accident · No injuries · Limited investigation · Final report · May 10, 1997 · N950AW · Substantial damage
  > The engine manufacturer's inadequate quality control by failing to install the harmonic balancer, causing the engine to fail catastrophically. A factor was the lack of suitable terrain on which to make a forced landing.
- [NTSB FTW96LA384](https://openairdocs.org/ntsb/FTW96LA384.md): Cessna 177RG · Colorado Sprngs, CO · Accident · No injuries · Limited investigation · Final report · Sep 11, 1996 · N2797V · Substantial damage
  > The improper installation of the propeller governor by company maintenance personnel, resulting in the total loss of oil and engine seizure. Factors were the pilot's misjudgment of altitude and airspeed, causing him to make a forced landing on unsuitable…
- [NTSB FTW96LA369](https://openairdocs.org/ntsb/FTW96LA369.md): Piper PA-32R-300 · Salida, CO · Accident · No injuries · Limited investigation · Final report · Sep 2, 1996 · N7640F · Substantial damage
  > total failure of the induction air control linkage (bolt), which allowed the alternate air door to close and starve the engine of air.
- [NTSB FTW96LA329](https://openairdocs.org/ntsb/FTW96LA329.md): Grumman G-164A · Burlington, CO · Accident · No injuries · Limited investigation · Final report · Jul 31, 1996 · N25SK · Substantial damage
  > The total loss of engine power resulting from a cracked cylinder. A factor was the unsuitable terrain for the forced landing.
- [NTSB FTW96LA272](https://openairdocs.org/ntsb/FTW96LA272.md): Grumman-Schweizer G-164A · Holyoke, CO · Accident · No injuries · Limited investigation · Final report · Jun 22, 1996 · N4698 · Substantial damage
  > the total failure of the engine main bearing. A factor was the soft terrain condition on which the forced landing was made.
- [NTSB FTW96LA167](https://openairdocs.org/ntsb/FTW96LA167.md): Weatherly 620 · Akron, CO · Accident · No injuries · Limited investigation · Final report · Apr 9, 1996 · N46139 · Substantial damage
  > a total loss of engine power due to failure of the number 2 cylinder. A factor was the limited cockpit visibility due to windscreen damage and engine oil coating.
- [NTSB FTW96LA061](https://openairdocs.org/ntsb/FTW96LA061.md): Cessna 182Q · Eads, CO · Accident · Minor injuries · Limited investigation · Final report · Dec 1, 1995 · N735JN · Substantial damage
  > Failure of the engine connecting rod bolts and separation of the cylinder from the crankcase. Factors were the lack of suitable terrain for the forced landing, and reduced light conditions (dark night).
- [NTSB FTW95LA257](https://openairdocs.org/ntsb/FTW95LA257.md): Rocky Mountain Buccaneer 11 B2B · Longmont, CO · Accident · 1 fatal · Limited investigation · Final report · Jun 23, 1995 · N4093F · Destroyed
  > The pilot's failure to maintain flying speed, resulting in an inadvertent stall while attempting to make a forced landing. Factors were the pilot's lack of total experience in airplane make/model, improper maintenance of the airplane, and operation of the…
- [NTSB FTW95LA065](https://openairdocs.org/ntsb/FTW95LA065.md): Commonwealth Rearwin 185 · Longmont, CO · Accident · No injuries · Limited investigation · Final report · Dec 12, 1994 · N93290 · Substantial damage
  > Oil exhaustion and subsequent engine seizure due to a missing oil drain plug. Factors were the inadequate maintenance and the lack of suitable terrain for a forced landing.
- [NTSB FTW94FA212](https://openairdocs.org/ntsb/FTW94FA212.md): Piper PA-46-350P · Akron, CO · Accident · Serious injuries · Field investigation · Final report · Jun 25, 1994 · N51CC · Substantial damage
  > The loss of engine power due to oil exhaustion which resulted from a failed oil scraper ring. A factor was unsuitable terrain for a forced landing.
- [NTSB FTW94LA202](https://openairdocs.org/ntsb/FTW94LA202.md): Riley, Donald Rutan Varieze · Fort Lupton, CO · Accident · Serious injuries · Limited investigation · Final report · Jun 19, 1994 · N111DR · Destroyed
  > Blockage of the oil scavenge pump by foreign material which was introduced into the engine during maintenance. A factor was the lack of suitable terrain for the forced landing.
- [NTSB FTW94FA141](https://openairdocs.org/ntsb/FTW94FA141.md): Mooney M20E · Broomfield, CO · Accident · 2 fatal · Field investigation · Final report · May 1, 1994 · N1905Y · Destroyed
  > Fatigue failure of the engine crankshaft; and failure of the pilot to maintain adequate airspeed, while maneuvering to land, which resulted in a stall and collision with the terrain. Factors related to the accident were: the undesirable engine/propeller…
- [NTSB FTW94LA133](https://openairdocs.org/ntsb/FTW94LA133.md): Laurel Aero Club Cassutt III M · Strasburg, CO · Accident · Minor injuries · Limited investigation · Final report · Apr 22, 1994 · N8871 · Substantial damage
  > The pilot's failure to attain the proper touchdown point. Factors were: a power failure due to a sheared accessory drive gear, excessive airspeed and altitude, and a soft field.
- [NTSB FTW94LA049](https://openairdocs.org/ntsb/FTW94LA049.md): Bellanca 8KCAB · Westcliffe, CO · Accident · Minor injuries · Limited investigation · Final report · Dec 17, 1993 · N5065G · Substantial damage
  > Was failure of the number two connecting rod bearing. A factor was unsuitable terrain for a forced landing.
- [NTSB DEN93LA030](https://openairdocs.org/ntsb/DEN93LA030.md): Cessna T210N · Walsh, CO · Accident · No injuries · Limited investigation · Final report · Mar 3, 1993 · N5367A · Substantial damage
  > A complete power loss from mechanical failure. A factor was: a pond, which the aircraft entered during landing roll.
- [NTSB DEN93LA018](https://openairdocs.org/ntsb/DEN93LA018.md): Cessna 172E · Ramah, CO · Accident · No injuries · Limited investigation · Final report · Dec 27, 1992 · N3196F · Substantial damage
  > A total loss of engine power due to mechanical failure of the number one connecting rod. A factor was: a forced landing onto unsuitable terrain.
- [NTSB DEN92LA090](https://openairdocs.org/ntsb/DEN92LA090.md): Cessna A188 · Burlington, CO · Accident · No injuries · Limited investigation · Final report · Sep 3, 1992 · N8041V · Destroyed
  > Fractured connecting rod. A factor was: the lack of suitable terrain for the forced landing.
- [NTSB DEN92LA080](https://openairdocs.org/ntsb/DEN92LA080.md): Piper PA-25-235 · Karval, CO · Accident · No injuries · Limited investigation · Final report · Aug 3, 1992 · N8635L · Destroyed
  > An engine failure due to improper maintenance installation. A factor was: lack of suitable terrain for the forced landing.
- [NTSB DEN92LA054](https://openairdocs.org/ntsb/DEN92LA054.md): Cessna T210H · Boulder, CO · Accident · No injuries · Limited investigation · Final report · May 26, 1992 · N57AB · Substantial damage
  > Power loss due to low fuel pump pressure and a chafed upper deck reference line. A factor was: the pilot's inability to maintain directional control due to a partially extended main landing gear.
- [NTSB DEN92LA047](https://openairdocs.org/ntsb/DEN92LA047.md): Cessna 172RG · Elbert, CO · Accident · No injuries · Limited investigation · Final report · Apr 28, 1992 · N5282V · Substantial damage
  > Failure of the crankshaft left accessory gear which resulted in a complete power loss. A factor was: lack of suitable terrain for a forced landing.
- [NTSB DEN92LA037](https://openairdocs.org/ntsb/DEN92LA037.md): Cessna 177RG · Durango, CO · Accident · No injuries · Limited investigation · Final report · Feb 23, 1992 · N2550V · Substantial damage
  > A total loss of power due to a mechanical failure of the engine. Factors were: rough and uneven snow covered terrain.
- [NTSB DEN92FA035](https://openairdocs.org/ntsb/DEN92FA035.md): Swearingen SA-26AT · Glenwood Spring, CO · Accident · Serious injuries · Field investigation · Final report · Feb 14, 1992 · N26JB · Destroyed
  > Malfunction of the right engine fuel control that caused the engine to flame out, and delamination of the left engine compressor shroud. Factors were: the pilot became disoriented, the mountainous terrain, the dark night, and the weather conditions.
- [NTSB DEN92FA034](https://openairdocs.org/ntsb/DEN92FA034.md): Bell 206L-3 · Fort Collins, CO · Accident · 2 fatal · Field investigation · Final report · Feb 12, 1992 · N99TV · Substantial damage
  > Failure of the number 2-1/2 bearing due to an obstruction of a bearing oil feed tube by foreign material. Factors related to the accident were: improper maintenance during engine overhaul, and weather/terrain/water conditions in the emergency landing area.
- [NTSB DEN92LA011](https://openairdocs.org/ntsb/DEN92LA011.md): Piper PA-22-135 · Siebert, CO · Accident · Serious injuries · Limited investigation · Final report · Dec 2, 1991 · N3745A · Substantial damage
  > Total loss of engine power due to a plugged vent in the tank filler cap, resulting in fuel starvation. Factors related to the accident were: darkness and the lack of suitable terrain for a forced landing.
- [NTSB DEN92IA013](https://openairdocs.org/ntsb/DEN92IA013.md): Cessna T210M · La Veta, CO · Incident · No injuries · Incident investigation · Final report · Dec 1, 1991 · N6179N · Minor damage
  > Failure of the no 1 connecting rod due to lack of lubrication from blocked oil ports.
- [NTSB DEN92LA008](https://openairdocs.org/ntsb/DEN92LA008.md): Piper PA-28-161 · Greeley, CO · Accident · No injuries · Limited investigation · Final report · Nov 18, 1991 · N9811C · Substantial damage
  > A partial loss of engine power on initial takeoff climb due to a bent and loose carburetor heat control mechanism.
- [NTSB DEN91LA089](https://openairdocs.org/ntsb/DEN91LA089.md): Cessna A188B · Delta, CO · Accident · No injuries · Limited investigation · Final report · Jun 24, 1991 · N8278G · Substantial damage
  > A total power loss due to a ruptured fuel line, and the installation of an incorrect fuel line.
- [NTSB DEN91FA061](https://openairdocs.org/ntsb/DEN91FA061.md): Cessna T210M · Littleton, CO · Accident · Serious injuries · Field investigation · Final report · Apr 19, 1991 · N761CM · Destroyed
  > Improper reassembly of the overhauled turbocharger by maintenance personnel, and the pilot's improper use of the mixture control and boost pump. Factors related to the accident were: the adverse weather conditions and unsuitable terrain in the emergency…
- [NTSB DEN91IA046](https://openairdocs.org/ntsb/DEN91IA046.md): Avions Marcel Dassault Mistert Falcon 900 · Eagle, CO · Incident · No injuries · Incident investigation · Final report · Feb 18, 1991 · N90EW · Minor damage
  > Improper engine maintenance by maintenance personnel, improper assembly of the combustion assembly transition liner, and the rupture of the first stage lp turbine wheel.
- [NTSB DEN91LA041](https://openairdocs.org/ntsb/DEN91LA041.md): Beech P-35 · Durango, CO · Accident · Minor injuries · Limited investigation · Final report · Feb 10, 1991 · N9653Y · Substantial damage
  > Engine failure due to oil starvation caused by turbocharger oil feed line failure and subsequent loss of lubricating oil to the engine.

Next page: https://openairdocs.org/ntsb.md?state=CO&occurrence=351&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."eventStateOrRegion" = 'CO' 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" = 351)
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?occurrence=351&state=CO

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