# NTSB investigations, CO: 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 DEN08LA014](https://openairdocs.org/ntsb/DEN08LA014.md): Cessna 210 · Canon City, CO · Accident · No injuries · Limited investigation · Final report · Oct 17, 2007 · N215MD · Substantial damage > The failure of the engine throttle cable resulting in a lack of engine power when commanded. - [NTSB DEN07LA138](https://openairdocs.org/ntsb/DEN07LA138.md): Air Tractor AT-301 · Alamosa, CO · Accident · Minor injuries · Limited investigation · Final report · Aug 18, 2007 · N69WN · Substantial damage > The failure of the number one cylinder due to fatigue. Contributing to the accident was the pilot's diminished visual lookout due to the oil covered windscreen. - [NTSB DEN07LA124](https://openairdocs.org/ntsb/DEN07LA124.md): Cessna A185F · Englewood, CO · Accident · No injuries · Limited investigation · Final report · Jul 20, 2007 · N78011 · Substantial damage > This case was revised 10/31/2007. Low compression in number 2 cylinder, which reduced the airplane's climb capability. Contributing factors in this accident were the high density altitude conditions, and the tree. - [NTSB DEN04LA112](https://openairdocs.org/ntsb/DEN04LA112.md): Swearingen SA-226T · Rifle, CO · Accident · No injuries · Limited investigation · Final report · Jul 21, 2004 · N84GA · Substantial damage > the pilot's failure to maintain aircraft control during the aborted takeoff resulting in the airplane departing the runway and striking a runway light and two taxiway signs. Factors contributing to the accident were the broken sensor wire to the left engine's… - [NTSB DEN04CA101](https://openairdocs.org/ntsb/DEN04CA101.md): Whitlock Rotorway Exec 162F · Meeker, CO · Accident · No injuries · Data collection · Final report · Jul 10, 2004 · N518W · Substantial damage > aircraft control not maintained by the pilot. A contributing factor was the failure of the supercharger. - [NTSB DEN03LA123](https://openairdocs.org/ntsb/DEN03LA123.md): Piper PA-46-310P · Englewood, CO · Accident · No injuries · Limited investigation · Final report · Jul 6, 2003 · N4386G · Substantial damage > the pilot's improper flare which resulted in a hard landing. Contributing factors were the out-of-calibration waste gate actuator, a blown tire, and the airport sign. - [NTSB DEN02GA085](https://openairdocs.org/ntsb/DEN02GA085.md): Aerospatiale SA315B · Estes Park, CO · Accident · 1 fatal · Final report · Jul 31, 2002 · N3978Y · Destroyed > the pilot's abrupt collective input during water application to a forest fire. Contributing factors were encountering a vortex ring state, the inadvertent settling with power, the low altitude, and the mountainous terrain. - [NTSB DEN02LA064](https://openairdocs.org/ntsb/DEN02LA064.md): Beech 35 · Cortez, CO · Accident · Serious injuries · Limited investigation · Final report · Jun 29, 2002 · N404B · Substantial damage > an inadvertent stall as the pilot attempted to clear a cliff and ravine and avoid power lines, resulting in a collision with the ground. Contributing factors were a loss of engine power for undetermined reasons, a leaking carburetor and fuel pump, and the… - [NTSB DEN01LA141](https://openairdocs.org/ntsb/DEN01LA141.md): Enstrom 280FX · Ouray, CO · Accident · No injuries · Limited investigation · Final report · Aug 8, 2001 · N724BF · Substantial damage > the partial loss of engine power due to the slippage of the wastegate linkage as a result of the plunger on the linkage being undertorqued by an unknown person. A contributing factor was the lack of suitable terrain for the forced landing. - [NTSB DEN00LA134](https://openairdocs.org/ntsb/DEN00LA134.md): Cessna 310D · Pagosa Springs, CO · Accident · Serious injuries · Limited investigation · Final report · Jul 19, 2000 · N674FT · Substantial damage > The pilot inadvertently stalling the airplane. Factors were the pilot's failure to use the entire available runway, the high density altitude weather condition, and a partial loss of power on one engine due to a burned exhaust valve. - [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 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 DEN99LA015](https://openairdocs.org/ntsb/DEN99LA015.md): Mooney M20C · Englewood, CO · Accident · Serious injuries · Limited investigation · Final report · Oct 21, 1998 · N6405U · Substantial damage > The undertorquing of the camshaft gear retaining bolts during engine overhaul by maintenance personnel. A factor was the unsuitable terrain for a forced landing. - [NTSB FTW98LA367](https://openairdocs.org/ntsb/FTW98LA367.md): Aerospatiale SA315B · Naturita, CO · Accident · Minor injuries · Limited investigation · Final report · Aug 22, 1998 · N49525 · Substantial damage > Partial loss of engine power resulting from heat induced deterioration of the gas generator turbine. Factors were a forced landing in hilly unsuitable terrain containing mature trees. - [NTSB FTW98LA198](https://openairdocs.org/ntsb/FTW98LA198.md): Cessna 172N · Parker, CO · Accident · No injuries · Limited investigation · Final report · Apr 25, 1998 · N6356D · Substantial damage > a fractured #1 exhaust valve rocker arm stud, which subsequently resulted in loss of engine power and a forced landing. The lack of suitable terrain in the forced landing area was a related factor. - [NTSB FTW97LA298](https://openairdocs.org/ntsb/FTW97LA298.md): Piper J3C-65 · Castle Rock, CO · Accident · No injuries · Limited investigation · Final report · Aug 3, 1997 · N5985V · Substantial damage > A partial loss of engine power due to a cylinder exhaust valve jammed in the open position from excessive carbon deposits. A factor was the lack of suitable terrain on which to make a forced landing. - [NTSB FTW95LA313](https://openairdocs.org/ntsb/FTW95LA313.md): Steinke Early Bird · Akron, CO · Accident · No injuries · Limited investigation · Final report · Jul 23, 1995 · N593JN · Substantial damage > Failure of the pilot to properly flare the airplane for landing during an emergency landing after takeoff. Factors relating to the accidents were: a malfunction of the side rave valve, an excessively rich fuel mixture, and the high density altitude, which… - [NTSB FTW95LA312](https://openairdocs.org/ntsb/FTW95LA312.md): Piper J3C · Englewood, CO · Accident · No injuries · Limited investigation · Final report · Jul 22, 1995 · N5985V · Substantial damage > A partial power loss due to a stuck number four exhaust valve. A factor was the lack of suitable terrain for a forced landing. - [NTSB DEN93LA068](https://openairdocs.org/ntsb/DEN93LA068.md): Cessna 172N · Livermore, CO · Accident · No injuries · Limited investigation · Final report · Jun 11, 1993 · N4829E · Substantial damage > A partial power loss when the rocker box for one cylinder disengaged. A factor was: unsuitable terrain for a forced landing. - [NTSB DEN92LA092](https://openairdocs.org/ntsb/DEN92LA092.md): Cessna 150 · Greeley, CO · Accident · Minor injuries · Limited investigation · Final report · Sep 13, 1992 · N5703E · Substantial damage > Total loss of engine power due to a deteriorated carburetor float which resulted in engine flooding. A factor was: unsuitable terrain for a forced landing. - [NTSB DEN92LA073](https://openairdocs.org/ntsb/DEN92LA073.md): Cessna 150 · Ft. Collins, CO · Accident · Minor injuries · Limited investigation · Final report · Jul 13, 1992 · N66315 · Substantial damage > Improper rate of descent and lack of flare while conducting a forced landing. Factors were: partial power loss due to stuck exhaust valves caused by engine overheat from improper leaning. - [NTSB DEN92LA017](https://openairdocs.org/ntsb/DEN92LA017.md): Stinson 108-1 · Longmont, CO · Accident · Minor injuries · Limited investigation · Final report · Dec 22, 1991 · N97962 · Destroyed > A loss of engine power due to fouled spark plugs. The inadequate maintenance of the engine was a factor in the accident. - [NTSB DEN91LA112](https://openairdocs.org/ntsb/DEN91LA112.md): Lars Avid Flyer · Colorado Spring, CO · Accident · No injuries · Limited investigation · Final report · Aug 10, 1991 · N49BP · Substantial damage > The pilot's delay in flaring the airplane. Factors were: (1) stuck piston rings and (2) the pilot's failure to use flaps. - [NTSB DEN91LA066](https://openairdocs.org/ntsb/DEN91LA066.md): Cessna 421 · Englewood, CO · Accident · Minor injuries · Limited investigation · Final report · May 1, 1991 · N18DF · Substantial damage > Power loss on both engines as a result of exhaust system failure. - [NTSB DEN91LA053](https://openairdocs.org/ntsb/DEN91LA053.md): Rockwell 112B · Nederland, CO · Accident · Serious injuries · Limited investigation · Final report · Mar 18, 1991 · N1241J · Substantial damage > Deteriorated ignition harness and ignition lead arcing. Factors were the high density altitude and lack of suitable terrain for the forced landing. - [NTSB DEN90LA106](https://openairdocs.org/ntsb/DEN90LA106.md): Cessna 337 · Broomfield, CO · Accident · No injuries · Limited investigation · Final report · May 6, 1990 · N2208X · Substantial damage > The pilot's failure to properly execute a precautionary approach following an engine failure. - [NTSB DEN90LA044](https://openairdocs.org/ntsb/DEN90LA044.md): Cessna 182 · Frederick, CO · Accident · No injuries · Limited investigation · Final report · Jan 16, 1990 · N5310B · Substantial damage > A partial engine power loss induced by stuck intake valves. Contributing to the accident was the inadequate maintenance of the airplane and the unsuitable terrain in which the forced landing was performed. - [NTSB DEN88LA069](https://openairdocs.org/ntsb/DEN88LA069.md): Cessna 172N · Englewood, CO · Accident · No injuries · Limited investigation · Final report · Feb 12, 1988 · N4914D · Substantial damage > The private plt was practicing landings at centennial airport, denver, Colorado. Rnwy 17L, an asphalt rnwy 8,500 feet long and 101 feet wide, was in use. The plt reported that when he attempted to add power on final approach, the throttle cable would not… - [NTSB DEN87FA110](https://openairdocs.org/ntsb/DEN87FA110.md): Piper PA-23 · Craig, CO · Accident · Serious injuries · Field investigation · Final report · Apr 21, 1987 · N3231P · Substantial damage > The plt and his wife were on a cross country flt to visit relatives in north carolina. Several witnesses observed the aircraft depart Craig-moffet airport with the engine(s) running rough and using almost the entire runway to get airborne. Once airborne the… - [NTSB DEN85LA206](https://openairdocs.org/ntsb/DEN85LA206.md): Piper PA-22 · Boulder, CO · Accident · No injuries · Limited investigation · Final report · Jul 30, 1985 · N5430Z · Substantial damage > According to the plt, he was approaching the Boulder municipal arpt, Boulder, Colorado, for a VFR landing when his engine failed to develop sufficient power to sustain flight. A forced landing was made to a farmer's field. The acft sustained substantial… - [NTSB DEN84FU010](https://openairdocs.org/ntsb/DEN84FU010.md): Weedhopper B · Erie, CO · Accident · Serious injuries · Final report · Sep 9, 1984 · UNREG · Substantial damage > The ultralight engine lost power while the plt was in a practice area. He returned to the arpt, and during the attempt to land, the acft crahsed. An instructor said the acft seemed to be flying slower than normal and the plt extended the downwind turn to base… - [NTSB DEN84LU009](https://openairdocs.org/ntsb/DEN84LU009.md): Eipper Quicksilver MXL · Erie, CO · Accident · Minor injuries · Final report · Jul 23, 1984 · UNREG · Substantial damage > The ultralight was proceeding in a normal takeoff when the engine lost partial power at about 100 ft AGL. The plt turnedthe vehicle to avoid trees and a river. During the hard forced landing, the vehicle was damaged and the plt hurt his leg. Post accident… - [NTSB DEN84FA004](https://openairdocs.org/ntsb/DEN84FA004.md): Cessna 421C · Center, CO · Accident · No injuries · Field investigation · Final report · Oct 9, 1983 · N770JW · Substantial damage > The acft collided with a dirt bank after a left engine overspeed and loss of directional control during takeoff. The plthad already aborted one takeoff due to overboost and a sticking wastegate. The problem seemed corrected after work and lubrication by a… - [NTSB DEN83LA135](https://openairdocs.org/ntsb/DEN83LA135.md): Cessna TU206G · Molina, CO · Accident · Minor injuries · Limited investigation · Final report · Jun 8, 1983 · N732ZQ · Substantial damage > The pilot had leveled off at 17500 ft MSL when the engine made a detonating sound and lost power. Manifold pressure went to about 12 inches. Fuel pressure was normal but the cylinder head temperature fell rapidly. At 9000 ft MSL the engine surged to about 16… - [NTSB DEN83FTE06](https://openairdocs.org/ntsb/DEN83FTE06.md): John Tylenda Quickie · Erie, CO · Accident · No injuries · Final report · Feb 13, 1983 · N59JT · Substantial damage > The aircraft lost power during takeoff at about 50 to 75 feet above the runway. The pilot stated that the engine RPM began to surge. The pilot said he did not believe enough runway remained for a landing on the airport so he maintained level flt in a shallow… - [NTSB DEN82DA194](https://openairdocs.org/ntsb/DEN82DA194.md): Cessna 182P · 3/4 N.E. Of Nuc, CO · Accident · No injuries · Final report · Sep 14, 1982 · N7446N · Substantial damage > Minor eng maintenance was performed before takeoff. After takeoff the eng ran rough, backfired & could not produce sufficient power to sustain flight. During the landing in an open field the horizontal stablizer hit a fence. The plt reported that evidently a… - [NTSB DEN82AA191](https://openairdocs.org/ntsb/DEN82AA191.md): Mitsubishi MU-2B-25 · Hayden, CO · Accident · 6 fatal · Final report · Sep 12, 1982 · N66U · Destroyed > A maint supervisor & 2 plts noted that the l eng did not respond normally while being started. Aft starting, the plt taxied to rwy 10 for an IFR departure. Since the twy did not extend to the end of the rwy, the plt of another acft waited on the twy, just… - [NTSB DEN82DA181](https://openairdocs.org/ntsb/DEN82DA181.md): Ercoupe 415C · Englewood, CO · Accident · Serious injuries · Final report · Sep 3, 1982 · N87141 · Substantial damage > While on the downwind leg of the traffic pattern, a strong odor of fuel was detected by the aircrew. A few seconds later, there was a considerable loss of power. The engine continued to operate at reduced power, but the sink rate was too great to reach the… - [NTSB DEN82DA141](https://openairdocs.org/ntsb/DEN82DA141.md): American AA5B · Broomfield, CO · Accident · Minor injuries · Final report · Jul 22, 1982 · N28218 · Substantial damage > The pilot was conducting local area pleasure sightseeing flights when the aircraft failed to climb during a normal departure. She landed the aircraft in a plowed field. Investigation revealed the flight was conducted at a density altitude approximately 8,750… - [NTSB DEN82FA061](https://openairdocs.org/ntsb/DEN82FA061.md): Cessna 150 · Parker, CO · Accident · Serious injuries · Field investigation · Final report · Apr 18, 1982 · N6859A · Substantial damage > At about 150 ft AGL & beyond the rwy departure end the eng lost power. The acft impacted an embankment during the attempt to return to the arpt. Eng exam revealed that the #1 cylinder piston compression ring was broken corresonding to grooves on the cylinder.… - [NTSB DEN82DA044](https://openairdocs.org/ntsb/DEN82DA044.md): Piper PA-31P · Gunnison, CO · Accident · No injuries · Final report · Mar 15, 1982 · N12JP · Substantial damage > While enroute to addison, TX, the pilot noticed a fluctuation in the engine exhaust gas temperature gauge, followed by the tachometer dropping to zero. The pilot also observed smoke emanating from the engine nacelle and proceeded to secure the engine and… - [NTSB DEN82DA037](https://openairdocs.org/ntsb/DEN82DA037.md): Bell 206B III · Alma, CO · Accident · No injuries · Final report · Mar 1, 1982 · N580P · Substantial damage > The pilot reported that before the accident, the flight had been uneventful and all instruments were reading normal except the tot gauge. Reportedly, it was indicating 750 degrees, which was about 100 degrees higher than normal for his power setting of 70%… ## 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" = 352) ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC ``` This list as a web page: https://openairdocs.org/ntsb?occurrence=352&state=CO --- 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.