# NTSB investigations: Continental IO-520 series, CO

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 3 · 118 cases

## Latest cases

- [NTSB CEN25LA126](https://openairdocs.org/ntsb/CEN25LA126.md): Beech V35 · Engelwood, CO · Accident · No injuries · Class 3 · Limited · Preliminary report · Mar 16, 2025 · N7987R · Substantial damage
  > On March 16, 2025, at 1741 mountain daylight time, a Beech V35 airplane, N7987R, was substantially damaged when it was involved in an accident near Englewood, Colorado. The pilot was not injured. The airplane was operated as a Title 14 Code of Federal…
- [NTSB CEN24LA321](https://openairdocs.org/ntsb/CEN24LA321.md): Cessna A185 · Loveland, CO · Accident · No injuries · Class 4 · Limited · Final report · Aug 20, 2024 · N4490R · Substantial damage
  > The pilot’s failure to maintain directional control during the landing, that resulted in a ground loop and a runway excursion. Contributing to the accident was the flight instructor’s delayed remedial action.
- [NTSB CEN24LA227](https://openairdocs.org/ntsb/CEN24LA227.md): Beech D55 · Colorado Springs, CO · Accident · Minor injuries · Class 4 · Limited · Final report · Jun 11, 2024 · N321N · Substantial damage
  > The deflated right main landing gear tire due to a sidewall puncture made by an unknown object, which led to the pilot’s loss of directional control and the landing gear collapse during landing roll.
- [NTSB CEN21LA152](https://openairdocs.org/ntsb/CEN21LA152.md): Cessna A185F · Pueblo, CO · Accident · No injuries · Class 4 · Limited · Final report · Mar 7, 2021 · N185RF · Substantial damage
  > The pilot’s failure to maintain directional control in gusting crosswind conditions.
- [NTSB CEN21FA007](https://openairdocs.org/ntsb/CEN21FA007.md): Beech S35 · Telluride, CO · Accident · 2 fatal · Class 3 · Field · Final report · Oct 5, 2020 · N4444K · Substantial damage
  > The pilot’s loss of control during the climb to cruise flight resulting in the airplane’s impact with terrain. Contributing to the accident was the pilot’s decision to not climb to a higher altitude before proceeding over high terrain.
- [NTSB GAA20CA084](https://openairdocs.org/ntsb/GAA20CA084.md): Beech 55 · Broomfield, CO · Accident · No injuries · Data collection · Final report · Nov 9, 2019 · N6206V · Substantial damage
  > The pilot's unintentional retraction of the landing gear during the landing roll.
- [NTSB CEN17LA220](https://openairdocs.org/ntsb/CEN17LA220.md): Bellanca 17 30 · Watkins, CO · Accident · Serious injuries · Limited investigation · Final report · Jun 8, 2017 · N7328V · Substantial damage
  > The pilot's in-flight fuel mismanagement, which resulted in fuel starvation and a total loss of engine power.
- [NTSB CEN17LA091](https://openairdocs.org/ntsb/CEN17LA091.md): Beech 95-C55 · Delta, CO · Accident · No injuries · Limited investigation · Final report · Jan 18, 2017 · N303QB · Substantial damage
  > The failure of the landing gear to extend during landing approach due to the interference between the landing gear motor's sector and worm gears.
- [NTSB CEN15FA424](https://openairdocs.org/ntsb/CEN15FA424.md): Beech S35 · Pagosa Springs, CO · Accident · 2 fatal · Field investigation · Final report · Sep 25, 2015 · N193Q · Destroyed
  > Improper engine assembly by unknown maintenance personnel, which resulted in the failure of the No. 6 connecting rod due to oil starvation from the shifting of the crankshaft's No. 4 main bearing.
- [NTSB CEN15LA144](https://openairdocs.org/ntsb/CEN15LA144.md): Beech 58 · Denver, CO · Accident · No injuries · Limited investigation · Final report · Feb 16, 2015 · N297AT · Substantial damage
  > The pilot’s failure to maintain airplane control during a rejected takeoff from a slush-covered runway at night.
- [NTSB CEN14LA393](https://openairdocs.org/ntsb/CEN14LA393.md): Beech 35-C33A · Pueblo, CO · Accident · Serious injuries · Limited investigation · Final report · Jul 27, 2014 · N72CW · Substantial damage
  > A total loss of engine power due to fuel starvation, which resulted from the pilot’s improper fuel management and resulted in a forced landing on unsuitable terrain.
- [NTSB CEN10LA056](https://openairdocs.org/ntsb/CEN10LA056.md): Navion Navion G · Montrose, CO · Accident · Minor injuries · Limited investigation · Final report · Nov 18, 2009 · N2493T · Substantial damage
  > A loss of engine power due to the pilot’s inadequate preflight planning.
- [NTSB DEN08LA128](https://openairdocs.org/ntsb/DEN08LA128.md): Beech 35-C33A · Longmont, CO · Accident · No injuries · Limited investigation · Final report · Jul 23, 2008 · N7965M · Substantial damage
  > A total loss of engine power for reasons undetermined. Contributing to the accident was the unsuitable terrain on which to make a forced landing.
- [NTSB DFW08CA085](https://openairdocs.org/ntsb/DFW08CA085.md): Cessna 206 · Peyton, CO · Accident · Minor injuries · Data collection · Final report · Mar 21, 2008 · N1386V · Substantial damage
  > The loss of engine power due to fuel exhaustion as a result of the pilot's inadequate preflight planning.
- [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 DEN07CA015](https://openairdocs.org/ntsb/DEN07CA015.md): Cessna T210G · Delta, CO · Accident · No injuries · Data collection · Final report · Oct 23, 2006 · N6849R · Substantial damage
  > the pilot's failure to maintain aircraft control and a proper descent rate during the landing.
- [NTSB DEN07FA002](https://openairdocs.org/ntsb/DEN07FA002.md): Beech 36 · Centennial, CO · Accident · Minor injuries · Field investigation · Final report · Oct 4, 2006 · N7855R · Substantial damage
  > the loss of engine power for undetermined reasons. Contributing factors were the light pole and parked vehicles impacted during the forced landing.
- [NTSB DEN05LA088](https://openairdocs.org/ntsb/DEN05LA088.md): Beech S35 · Colorado Spring, CO · Accident · No injuries · Limited investigation · Final report · Jun 11, 2005 · N2FY · Substantial damage
  > the flight instructor and pilot's improper decision to continue the attempted high altitude takeoff when Vy airspeed was not obtained, and failure to abort the takeoff which resulted in an off-field landing and subsequent impact with terrain. A contributing…
- [NTSB DEN05LA086](https://openairdocs.org/ntsb/DEN05LA086.md): Beech S35 · Broomfield, CO · Accident · Minor injuries · Limited investigation · Final report · Jun 7, 2005 · N9TT · Substantial damage
  > the pilot's failure to maintain adequate airspeed which resulted in a stall, and his failure to abort the takeoff. The loss of power for undetermined reasons is a contributing factor.
- [NTSB DEN05FA047](https://openairdocs.org/ntsb/DEN05FA047.md): Beech E55 · Fort Collins, CO · Accident · 1 fatal · Field investigation · Final report · Apr 3, 2005 · N3FJ · Destroyed
  > the pilot's failure to maintain aircraft control. Contributing factors were the left engine loss of power for reasons undetermined, and the pilot allowing the airspeed to drop below Vmc during an attempted single-engine go-around.
- [NTSB DEN05LA008](https://openairdocs.org/ntsb/DEN05LA008.md): Cessna 210M · Salida, CO · Accident · No injuries · Limited investigation · Final report · Oct 10, 2004 · N732TE · Substantial damage
  > The pilot's inadequate preflight planning which failed to determine the fuel supply was inadequate resulting in fuel exhaustion and the loss of engine power.
- [NTSB DEN04LA118](https://openairdocs.org/ntsb/DEN04LA118.md): Beech V35A · Grand Junction, CO · Accident · No injuries · Limited investigation · Final report · Aug 1, 2004 · N222S · Substantial damage
  > the pilot's improper planning and decision making resulting in the loss of engine power due to fuel starvation. Contributing factors include the insufficient time to completely extend the landing gear, and the lack of suitable terrain for a forced landing.
- [NTSB DEN04CA080](https://openairdocs.org/ntsb/DEN04CA080.md): Cessna T188C · Lamar, CO · Accident · No injuries · Data collection · Final report · May 25, 2004 · N2030J · Substantial damage
  > A partial loss of engine power for undetermined reasons and the pilot's failure to maintain adequate airspeed which resulted in a stall. Contributing to the accident was the low altitude.
- [NTSB DEN04LA071](https://openairdocs.org/ntsb/DEN04LA071.md): Cessna A185E · Englewood, CO · Accident · Serious injuries · Limited investigation · Final report · May 8, 2004 · N185K · Substantial damage
  > the pilot's inadequate preflight planning which failed to verify an adequate fuel supply and his inadequate in-flight planning/decision which resulted in fuel exhaustion. The inadequate indication of his fuel quantity system is a contributing factor.
- [NTSB DEN04LA075](https://openairdocs.org/ntsb/DEN04LA075.md): Beech 95-C55 · Rifle, CO · Accident · No injuries · Limited investigation · Final report · Apr 28, 2004 · N282JL · Substantial damage
  > the pilot's failure to verify the manual extension of the landing gear resulting in an inadvertent wheels up landing. Contributing factors include the electrical systems failure for undetermined reasons, the pilot's diverted attention and the pilot's improper…
- [NTSB DEN04LA013](https://openairdocs.org/ntsb/DEN04LA013.md): Cessna 210G · Meeker, CO · Accident · No injuries · Limited investigation · Final report · Oct 16, 2003 · N5915F · Substantial damage
  > the pilot's failure to extend the landing gear. Contributing to the accident was the pilots failure to recognize the gear warning horn during the landing flare.
- [NTSB DEN03LA118](https://openairdocs.org/ntsb/DEN03LA118.md): Cessna 210K · Durango, CO · Accident · Minor injuries · Limited investigation · Final report · Jun 29, 2003 · N8264M · Substantial damage
  > the pilot's improper in-flight planning/decision and his failure to maintain aircraft control. Factors contributing to the accident were the high altitude on base turn and final approach, the low airspeed, the pilot's improper use of flaps, the inadvertent…
- [NTSB DEN03LA107](https://openairdocs.org/ntsb/DEN03LA107.md): Beech S35 · Colorado Spring, CO · Accident · No injuries · Limited investigation · Final report · Jun 14, 2003 · N5751K · Substantial damage
  > the pilot's inadequate in-flight planning/decision in which he mismanaged his fuel supply by failing to switch tanks resulting in fuel starvation and the loss of engine power. A contributing factor was the pilot's diverted attention.
- [NTSB DEN03FA059](https://openairdocs.org/ntsb/DEN03FA059.md): Cessna A185F · Grand Junction, CO · Accident · 4 fatal · Field investigation · Final report · Mar 27, 2003 · N53008 · Destroyed
  > the pilot's poor judgment and his failure to maintain aircraft control. Contributing factors were the high winds and downdrafts, and the pilot's self-induced pressure to go home.
- [NTSB DEN03LA029](https://openairdocs.org/ntsb/DEN03LA029.md): Beech F33A · Durango, CO · Accident · No injuries · Limited investigation · Final report · Dec 28, 2002 · N1592W · Substantial damage
  > the pilot's failure to extend the landing gear. A contributing factor is the pilot's failure to follow the checklist.
- [NTSB DEN02GA102](https://openairdocs.org/ntsb/DEN02GA102.md): Cessna A185F · Howard, CO · Accident · 1 fatal · Final report · Sep 4, 2002 · N24GS · Destroyed
  > the pilot's failure to maintain clearance of the terrain. Contributing factors were the clear air turbulent weather condition, and the high density altitude condition.
- [NTSB DEN02LA041](https://openairdocs.org/ntsb/DEN02LA041.md): Cessna A185E · Greeley, CO · Accident · No injuries · Limited investigation · Final report · Apr 28, 2002 · N4730Q · Substantial damage
  > the inadvertent ground loop during landing roll. A contributing factor was the partial brake system failure.
- [NTSB DEN99FA093](https://openairdocs.org/ntsb/DEN99FA093.md): Beech V35A · Nederland, CO · Accident · 1 fatal · Field investigation · Final report · Jun 5, 1999 · N68VT · Destroyed
  > The pilot's intentional and continued flight into instrument meteorological conditions. Factors were his failure to obtain a weather briefing, the existing weather conditions that included snow, hail, obscuration and lightning, and the mountainous terrain.
- [NTSB FTW98LA324](https://openairdocs.org/ntsb/FTW98LA324.md): Cessna A188B · Erie, CO · Accident · No injuries · Limited investigation · Final report · Jul 20, 1998 · N21827 · Substantial damage
  > The pilot's failure to maintain directional control of the airplane. A factor was a crosswind gust.
- [NTSB FTW98LA066](https://openairdocs.org/ntsb/FTW98LA066.md): Cessna 207 · Fruita, CO · Accident · Minor injuries · Limited investigation · Final report · Dec 10, 1997 · N91002 · Substantial damage
  > The total loss of engine power for undetermined reasons.
- [NTSB FTW97LA338](https://openairdocs.org/ntsb/FTW97LA338.md): Beech V35B · Saguache, CO · Accident · No injuries · Limited investigation · Final report · Sep 4, 1997 · N7397R · Substantial damage
  > **This report was modified on 2/23/2016. Please see the public docket for this accident for additional information.** the loss of engine power during cruise for undetermined reasons and the unsuitable terrain encountered by the pilot during the forced…
- [NTSB FTW97LA297](https://openairdocs.org/ntsb/FTW97LA297.md): Beech F33A · Creede, CO · Accident · Serious injuries · Limited investigation · Final report · Aug 3, 1997 · N179DD · Destroyed
  > The pilot's intentional low altitude flight over mountainous terrain, inadequate altitude to clear surrounding obstacles, and his misjudging vertical clearance. A factor was the pilot's use of an inappropriate chart for navigation.
- [NTSB FTW96LA082](https://openairdocs.org/ntsb/FTW96LA082.md): Bellanca 17-30 · Durango, CO · Accident · No injuries · Limited investigation · Final report · Dec 30, 1995 · N7356V · Substantial damage
  > the failure of the nose wheel steering mechanism which rendered the aircraft uncontrollable on the ground. A factor was the rough and uneven terrain.
- [NTSB FTW95LA353](https://openairdocs.org/ntsb/FTW95LA353.md): Beech 35N · Creede, CO · Accident · No injuries · Limited investigation · Final report · Aug 19, 1995 · N149G · Substantial damage
  > Failure by the pilot to follow the checklist and lower the landing gear.
- [NTSB FTW95LA073](https://openairdocs.org/ntsb/FTW95LA073.md): Cessna A185F · Erie, CO · Accident · Minor injuries · Limited investigation · Final report · Dec 23, 1994 · N8389Q · Substantial damage
  > The pilot's failure to maintain airspeed resulting in the inadvertent stall.
- [NTSB FTW94LA040](https://openairdocs.org/ntsb/FTW94LA040.md): Cessna A185F · Maybell, CO · Accident · No injuries · Limited investigation · Final report · Nov 30, 1993 · N6613N · Substantial damage
  > The pilot's failure to ascertain the condition of the landing area. The snow covered condition of the runway was a factor.
- [NTSB DEN93LA020](https://openairdocs.org/ntsb/DEN93LA020.md): Beech 58 · Ft Collins, CO · Accident · No injuries · Limited investigation · Final report · Dec 31, 1992 · N21BW · Substantial damage
  > Failure by the pilot to follow IFR procedures in not executing a missed approach when he arrived at the runway threshold with improper alignment and improper descent rate for landing. A factor was: marginal weather conditions.
- [NTSB DEN93LA006](https://openairdocs.org/ntsb/DEN93LA006.md): Bellanca 17-30A · Grand Junction, CO · Accident · No injuries · Limited investigation · Final report · Oct 18, 1992 · N14695 · Substantial damage
  > Fatigue failure of the nose landing gear upper drag strut bracket due to fatigue cracking.
- [NTSB DEN93LA001](https://openairdocs.org/ntsb/DEN93LA001.md): Beech F33A · Steamboat Sprgs, CO · Accident · Minor injuries · Limited investigation · Final report · Oct 3, 1992 · N4532S · Substantial damage
  > The pilot's selection of an unsuitable landing area when a suitable forced landing area was available. A factor was: fuel starvation for unknown reasons.
- [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 DEN92FA081](https://openairdocs.org/ntsb/DEN92FA081.md): Cessna 402A · Holyoke, CO · Accident · No injuries · Field investigation · Final report · Aug 5, 1992 · N4504Q · Substantial damage
  > Failure of the pilot to feather the failed engine propeller. A factor was: power loss for undetermined reasons.
- [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 DEN91LA050](https://openairdocs.org/ntsb/DEN91LA050.md): Beech V35B · Englewood, CO · Accident · No injuries · Limited investigation · Final report · Mar 10, 1991 · N9038Q · Destroyed
  > The pilot's premature liftoff and inadvertent stall mush. Factors were: downdrafts, high density altitude, and unsuitable terrain.
- [NTSB DEN90DTE05](https://openairdocs.org/ntsb/DEN90DTE05.md): Cessna 188B · Eckley, CO · Accident · No injuries · Final report · Aug 20, 1990 · N4933Q · Substantial damage
  > A failure on the part of the pilot in command to maintain adequate terrain clearance.
- [NTSB DEN90LA134](https://openairdocs.org/ntsb/DEN90LA134.md): Cessna A185F · Erie, CO · Accident · No injuries · Limited investigation · Final report · Jun 13, 1990 · N8389Q · Substantial damage
  > Failure of the pilot receiving instruction to choose suitable terrain for the landing. Contributing to the accident was the cfi's inadequate supervision.

Next page: https://openairdocs.org/ntsb.md?engine=17032&state=CO&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 x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.engine_model_code IN ('17032'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?engine=17032&state=CO

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