# NTSB investigations, AK: 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 3 · 143 cases

## Latest cases

- [NTSB ANC07LA104](https://openairdocs.org/ntsb/ANC07LA104.md): Cessna U206 · McGrath, AK · Accident · Minor injuries · Limited investigation · Final report · Sep 21, 2007 · N8030Z · Substantial damage
  > A separation of the engine connecting rod and engine cylinder due to the loss of a connecting rod nut that was stripped from the rod bolt.
- [NTSB ANC07LA085](https://openairdocs.org/ntsb/ANC07LA085.md): Cessna 207 · Fairbanks, AK · Accident · No injuries · Limited investigation · Final report · Aug 17, 2007 · N73463 · Substantial damage
  > The loss of engine power in cruise flight due to a lack of sufficient oil. A factor contributing to the accident was the pilot's improper in-flight decision to continue the flight after noting a loss of oil pressure.
- [NTSB ANC07FA013](https://openairdocs.org/ntsb/ANC07FA013.md): Cessna 207A · Kenai, AK · Accident · 1 fatal · Field investigation · Final report · Jan 9, 2007 · N9941M · Substantial damage
  > The total loss of engine power during cruise flight due to the disintegration of engine bearings and the fracture of a connecting rod, which resulted in a ditching into ice covered ocean water. Factors contributing to the survivability of the accident were…
- [NTSB ANC06LA144](https://openairdocs.org/ntsb/ANC06LA144.md): Cessna TU206A · Juneau, AK · Accident · No injuries · Limited investigation · Final report · Oct 1, 2006 · N206AK · Substantial damage
  > The separation of the number 6 cylinder assembly from the engine during cruise flight, which resulted in a hard forced landing in rough ocean swells. A factor contributing to the accident was the rough ocean swells.
- [NTSB ANC06LA084](https://openairdocs.org/ntsb/ANC06LA084.md): Beech P35 · Gustavus, AK · Accident · No injuries · Limited investigation · Final report · Jul 1, 2006 · N8690M · Substantial damage
  > The fracture of an engine connecting rod during cruise flight, which resulted in a forced landing on a beach, a collapsed nose landing gear, and substantial damage to the fuselage.
- [NTSB ANC06LA005](https://openairdocs.org/ntsb/ANC06LA005.md): Crisenbery Northman 2+2 · Nenana, AK · Accident · No injuries · Limited investigation · Final report · Oct 14, 2005 · N239PT · Substantial damage
  > A loss of engine power during cruise flight due to a cracked oil filter housing and subsequent loss of engine oil, which resulted in a forced landing in trees.
- [NTSB ANC05LA107](https://openairdocs.org/ntsb/ANC05LA107.md): Aerospatiale AS-350BA · Juneau, AK · Accident · No injuries · Limited investigation · Final report · Jul 25, 2005 · N57958 · Substantial damage
  > A loss of engine power during takeoff initial climb due to the separation of the engine power turbine shaft, the failure of which was due to a disconnected adjacent leaf spring, which resulted in an emergency landing after takeoff and subsequent hard landing.
- [NTSB ANC04LA003](https://openairdocs.org/ntsb/ANC04LA003.md): Fairchild 42 · Wasilla, AK · Accident · Minor injuries · Limited investigation · Final report · Oct 12, 2003 · N106M · Substantial damage
  > The inadequate inspection of the carburetor by the aircraft mechanic who had recently worked on the carburetor, which failed to detect a cracked float, resulting in a total loss of engine power during cruise flight. A factor associated with the accident was…
- [NTSB ANC03LA091](https://openairdocs.org/ntsb/ANC03LA091.md): Cessna 207A · Bethel, AK · Accident · No injuries · Limited investigation · Final report · Aug 8, 2003 · N6439H · Substantial damage
  > A complete loss of engine power during cruise flight due to the shifting of a main crankshaft bearing that produced a fatigue failure of the crankshaft. A factor contributing to the accident was unsuitable terrain for a forced landing, which resulted in a…
- [NTSB ANC03LA073](https://openairdocs.org/ntsb/ANC03LA073.md): Bell 206B · Aniak, AK · Accident · Minor injuries · Limited investigation · Final report · Jul 10, 2003 · N111MT · Substantial damage
  > The compressor discharge pressure line (Pc line) B-nut coming loose at the fuel control unit, which resulted in a total loss of engine power, and subsequent in-flight collision with trees during an autorotation. A factor associated with the accident was the…
- [NTSB ANC02LA041](https://openairdocs.org/ntsb/ANC02LA041.md): Cessna 180 · Skwentna, AK · Accident · No injuries · Limited investigation · Final report · May 18, 2002 · N9024M · Substantial damage
  > A total engine failure during cruise flight due to the disentegration of the number five cylinder piston. A contributing factor in the accident was the lack of suitable terrain for a forced landing.
- [NTSB ANC01LA118](https://openairdocs.org/ntsb/ANC01LA118.md): Thomson Avid Flyer · Chugiak, AK · Accident · No injuries · Limited investigation · Final report · Aug 22, 2001 · N47065 · Substantial damage
  > The loss of engine power during initial climb due to a broken spark plug.
- [NTSB ANC01FA095](https://openairdocs.org/ntsb/ANC01FA095.md): Cessna 172 · Eagle River, AK · Accident · Serious injuries · Field investigation · Final report · Aug 1, 2001 · N5312T · Substantial damage
  > The fatigue induced fracture of a connecting rod wrist pin, resulting in a complete loss of engine power.
- [NTSB ANC01IA058](https://openairdocs.org/ntsb/ANC01IA058.md): Cessna 207 · Quinhagak, AK · Incident · No injuries · Incident investigation · Final report · May 18, 2001 · N917AC · Minor damage
  > An in-flight fracture of the engine crankshaft during descent, precipitated by restricted oil flow through an internal engine oil passage/port.
- [NTSB ANC01LA050](https://openairdocs.org/ntsb/ANC01LA050.md): Stinson 108-3 · Glennallen, AK · Accident · Minor injuries · Limited investigation · Final report · Apr 22, 2001 · N6912M · Destroyed
  > A total failure of the engine and subsequent rupture of the crankcase during cruise flight. A factor in the accident was unsuitable terrain for a forced landing.
- [NTSB ANC00FA056](https://openairdocs.org/ntsb/ANC00FA056.md): Beech B24R · Anchorage, AK · Accident · No injuries · Field investigation · Final report · May 9, 2000 · N6951R · Substantial damage
  > A fatigue failure of the crankcase through bolt, the separation of number 3 cylinder assembly, and the inadequate maintenance/service of the airplane by company maintenance personnel.
- [NTSB ANC00LA035](https://openairdocs.org/ntsb/ANC00LA035.md): Cessna 207 · Delta Junction, AK · Accident · Minor injuries · Limited investigation · Final report · Mar 10, 2000 · N75703 · Substantial damage
  > The disintegration of the number two piston. A factor in this accident was the subsequent metal fouling of the spark plugs, which resulted in total loss of engine power.
- [NTSB ANC99LA114](https://openairdocs.org/ntsb/ANC99LA114.md): Cessna 206A · Cordova, AK · Accident · No injuries · Limited investigation · Final report · Aug 15, 1999 · N4605F · Substantial damage
  > A loss of engine power due to corrosion/blockage of the fuel flow divider vent hole. A factor was unsuitable terrain for a forced landing.
- [NTSB ANC99LA099](https://openairdocs.org/ntsb/ANC99LA099.md): Boeing 747-269B · Anchorage, AK · Accident · No injuries · Limited investigation · Final report · Jul 29, 1999 · N707CK · Substantial damage
  > The failure of a turbine blade, and subsequent penetration of the shroud (containment ring). A factor associated with the accident was the FAA's insufficient design standards/requirements addressed in an FAA Air Worthiness Directive, which called for a…
- [NTSB ANC99LA052](https://openairdocs.org/ntsb/ANC99LA052.md): Cessna 185 · Juneau, AK · Accident · Serious injuries · Limited investigation · Final report · Apr 27, 1999 · N93311 · Substantial damage
  > The failure of the engine driven fuel pump for undetermined reasons. Factors associated with this accident were the low altitude at which the failure occurred resulting in task overload of the pilot, and landing the amphibious airplane in the swampy terrain…
- [NTSB ANC99LA043](https://openairdocs.org/ntsb/ANC99LA043.md): Piper PA-32R · Fairbanks, AK · Accident · Minor injuries · Limited investigation · Final report · Apr 5, 1999 · N1942H · Substantial damage
  > The loss of engine power due to the failure of maintenance personnel to properly torque a connecting rod bolt during an engine overhaul, and the subsequent disconnection of the connecting rod bolt and connecting rod.
- [NTSB ANC98LA140](https://openairdocs.org/ntsb/ANC98LA140.md): Cessna 140 · Fairbanks, AK · Accident · No injuries · Limited investigation · Final report · Sep 7, 1998 · N81045 · Substantial damage
  > The loss of engine power due to an in-flight fracture of an engine exhaust valve stem assembly. A factor associated with the accident was the lack of suitable terrain for a forced landing.
- [NTSB ANC98LA078](https://openairdocs.org/ntsb/ANC98LA078.md): Cessna 207 · Holy Cross, AK · Accident · No injuries · Limited investigation · Final report · Jun 20, 1998 · N1673U · Substantial damage
  > The improper installation/undertorquing of the engine crankcase bolts by company maintenance personnel, and a subsequent fracture of the engine crankshaft. A factor in the accident was unsuitable terrain for a forced landing.
- [NTSB ANC98LA041](https://openairdocs.org/ntsb/ANC98LA041.md): Cessna 170B · Kenai, AK · Accident · No injuries · Limited investigation · Final report · Apr 25, 1998 · N2692D · Substantial damage
  > A failure of the number six cylinder rod bearing and connecting rod cap for undetermined reasons. Factors in the accident were snow covered terrain that was unsuitable for a forced landing.
- [NTSB ANC97FA143](https://openairdocs.org/ntsb/ANC97FA143.md): Aero Commander AC-500A · Ketchikan, AK · Accident · 2 fatal · Field investigation · Final report · Sep 6, 1997 · N543AN · Destroyed
  > The rupture of the right engine fuel supply line as a result of inadequate inspection by the pilot/mechanic, and the pilot's excessive pull up which resulted in exceeding the design stress limits of the airplane. Factors were the improper emergency procedures…
- [NTSB ANC97LA112](https://openairdocs.org/ntsb/ANC97LA112.md): Cessna 206 · Palmer, AK · Accident · Serious injuries · Limited investigation · Final report · Jul 26, 1997 · N9412Z · Substantial damage
  > A fatigue failure of the engine crankshaft, and an inadequate engine cylinder replacement by maintenance personnel. A factor in the accident was unsuitable terrain for a forced landing.
- [NTSB ANC97FA097](https://openairdocs.org/ntsb/ANC97FA097.md): Piper PA-32 · Skagway, AK · Accident · 4 fatal · Field investigation · Final report · Jul 4, 1997 · N15199 · Destroyed
  > jamming/failure of the left magneto impulse coupling, which stopped rotation of the magneto gear, and resulted in subsequent shearing of the accessory intermediate idler gear. Factors relating to the accident were: the lack of suitable terrain for a forced…
- [NTSB ANC97LA084](https://openairdocs.org/ntsb/ANC97LA084.md): Anderson Kitfox IV-1200 · Fairbanks, AK · Accident · No injuries · Limited investigation · Final report · Jun 5, 1997 · N85TA · Substantial damage
  > a seized crankshaft connecting rod bearing. A factor relating to the acciden was: the lack of suitable terrain for an emergency landing.
- [NTSB ANC97LA068](https://openairdocs.org/ntsb/ANC97LA068.md): Hammer Avid Flyer · Chitina, AK · Accident · No injuries · Limited investigation · Final report · May 4, 1997 · N525BB · Substantial damage
  > improper overhaul of the engine, which resulted in a seized piston and resultant loss of engine power. Rough terrain in the emergency landing area was a related factor.
- [NTSB ANC97LA052](https://openairdocs.org/ntsb/ANC97LA052.md): Piper PA-28-140 · Port Alsworth, AK · Accident · No injuries · Limited investigation · Final report · Apr 10, 1997 · N6472R · Substantial damage
  > loss of engine power, due to failure of the number 2 connecting rod assembly (rod, bearing, & bolts). The lack of suitable terrain for a forced landing was a related factor.
- [NTSB ANC97LA036](https://openairdocs.org/ntsb/ANC97LA036.md): Williams Kitfox · Wasilla, AK · Accident · Minor injuries · Limited investigation · Final report · Mar 22, 1997 · N9KF · Substantial damage
  > a broken electrical wire, which resulted in an inoperative electrical fuel pump, an overly lean mixture, fuel starvation, and loss of engine power.
- [NTSB ANC96LA140](https://openairdocs.org/ntsb/ANC96LA140.md): Piper PA-28-161 · Skwentna, AK · Accident · Minor injuries · Limited investigation · Final report · Sep 1, 1996 · N4366Y · Substantial damage
  > corrosion and subsequent fatigue failure of the crankshaft, which resulted in engine failure and a forced landing. Factors related to the accident were: the lack of suitable terrain for a forced landing, and the operator's non-compliance with a service…
- [NTSB ANC96LA124](https://openairdocs.org/ntsb/ANC96LA124.md): Piper PA-18 · Skwentna, AK · Accident · No injuries · Limited investigation · Final report · Aug 14, 1996 · N7797B · Substantial damage
  > An engine failure due to an eroded engine piston. Factors in the accident were unsuitable terrain for a forced landing and improperly timed magnetos.
- [NTSB ANC96LA103](https://openairdocs.org/ntsb/ANC96LA103.md): Cessna 172XP · Kenai, AK · Accident · No injuries · Limited investigation · Final report · Jul 21, 1996 · N736LB · Substantial damage
  > The loss of engine power due to seized piston connecting rod bearings, and subsequent failure of the piston connecting rod cap and fracture of the piston connecting rod. A factor associated with the accident was the rough and uneven emergency landing site.
- [NTSB ANC96FA102](https://openairdocs.org/ntsb/ANC96FA102.md): Douglas DC-6A · Russian Mission, AK · Accident · 4 fatal · Field investigation · Final report · Jul 20, 1996 · N313RS · Destroyed
  > fatigue failure of the master connecting rod, which originated from corrosion pitting, subsequently compromised the engine crankcase, and resulted in a fire; and failure of the flight crew to follow emergency procedures by pulling the fire handle before…
- [NTSB ANC96TA095](https://openairdocs.org/ntsb/ANC96TA095.md): Cessna 185 · Fairbanks, AK · Accident · Minor injuries · Final report · Jul 4, 1996 · N185CA · Destroyed
  > fatigue failure of the engine crankshaft. A factor related to the accident was: the lack of suitable terrain for a forced landing.
- [NTSB ANC96LA088](https://openairdocs.org/ntsb/ANC96LA088.md): Piper PA-32-300 · Gustavus, AK · Accident · No injuries · Limited investigation · Final report · Jun 15, 1996 · N8956N · Substantial damage
  > A loss of engine power due to low fuel pressure from the engine driven fuel pump and subsequent fuel starvation. A factor was the lack of suitable terrain for a forced landing.
- [NTSB ANC96LA053](https://openairdocs.org/ntsb/ANC96LA053.md): Maule M-5-210C · Grayling, AK · Accident · No injuries · Limited investigation · Final report · Apr 21, 1996 · N9704N · Destroyed
  > disintegration of the alternator drive coupling, jamming of the accessory drive gear, shearing of the oil pump drive, oil starvation, and failure of the number 6 cylinder connecting rod. Non-compliance with a manufacturer's service bulletin and soft snow were…
- [NTSB ANC96LA017](https://openairdocs.org/ntsb/ANC96LA017.md): Cessna 207 · Aniak, AK · Accident · No injuries · Limited investigation · Final report · Nov 18, 1995 · N70076 · Substantial damage
  > fatigue failure of the engine crankshaft at the number 2 main bearing journal, where rubbing contact had occurred with the number 2 main bearing. A factor relating to the accident was: the lack of suitable terrain for an emergency landing.
- [NTSB ANC95LA119](https://openairdocs.org/ntsb/ANC95LA119.md): Cessna 421C · Cordova, AK · Accident · 4 fatal · Limited investigation · Final report · Jul 29, 1995 · N800DD · Destroyed
  > Mechanical loss of engine power for undetermined reason(s), and subsequent in-flight collision with water (or ditching at sea).
- [NTSB ANC95LA058](https://openairdocs.org/ntsb/ANC95LA058.md): Cessna 206 · Bethel, AK · Accident · No injuries · Limited investigation · Final report · May 25, 1995 · N19BR · Substantial damage
  > A failure of the #2 main engine bearing and subsequent fatigue failure of the engine crankshaft. A factor relating to the accident was: the lack of suitable terrain for an emergency landing.
- [NTSB ANC95LA053](https://openairdocs.org/ntsb/ANC95LA053.md): Cessna 170B · Chickaloon, AK · Accident · No injuries · Limited investigation · Final report · May 12, 1995 · N4366B · Substantial damage
  > The fracture of the crankshaft resulting in separation of the propeller and propeller flange in-flight. A factor associated with the accident was the lack of suitable terrain for an emergency landing.
- [NTSB ANC94FA106](https://openairdocs.org/ntsb/ANC94FA106.md): Piper PA-32-260 · Kenai, AK · Accident · 3 fatal · Field investigation · Final report · Aug 14, 1994 · N4839S · Destroyed
  > Inadequate engine maintenance and/or inspection, and fatigue cracking of the engine case, which resulted in eventual damage to the #3 cylinder studs/engine through-bolts, subsequent separation of the #3 cylinder and piston, and an in-flight fire.
- [NTSB ANC94LA097](https://openairdocs.org/ntsb/ANC94LA097.md): Cessna 206 · Mosquito Flats, AK · Accident · No injuries · Limited investigation · Final report · Aug 5, 1994 · N5200X · Substantial damage
  > The missing number 6 cylinder piston pin cap and the subsequent failure of the number 6 cylinder connecting rod cap. Also, the lack of suitable landing area for the forced landing.
- [NTSB ANC94LA095](https://openairdocs.org/ntsb/ANC94LA095.md): Starman Teirra II · North Pole, AK · Accident · No injuries · Limited investigation · Final report · Jul 31, 1994 · N43111 · Substantial damage
  > The seizure of the no. 2 cylinder as a result of an inadequate cooling system for the high ambient temperature.
- [NTSB ANC94LA078](https://openairdocs.org/ntsb/ANC94LA078.md): Cessna T207 · Kenai, AK · Accident · Serious injuries · Limited investigation · Final report · Jul 9, 1994 · N91056 · Substantial damage
  > The failure of the engine crankshaft. Factors in the accident were the pilot's inadequate compensation for the wind conditions and not attaining the proper touchdown point at the suitable landing strip.
- [NTSB ANC94LA061](https://openairdocs.org/ntsb/ANC94LA061.md): Piper PA-20 · Anchorage, AK · Accident · No injuries · Limited investigation · Final report · May 28, 1994 · N6174D · Substantial damage
  > The failure of an exhaust valve. The lack of suitable terrain for a forced landing was a factor.
- [NTSB ANC94FA036](https://openairdocs.org/ntsb/ANC94FA036.md): Lockheed L-1011 · Fairbanks, AK · Accident · No injuries · Field investigation · Final report · Mar 1, 1994 · N303EA · Substantial damage
  > Failure of the sixth stage disc on the intermediate compressor stage 6/7TH rotor shaft assembly in the number three engine, due to corrosion pitting and fatigue cracking of the failed disc. A factor related to the accident was: failure of the airline company…
- [NTSB ANC93IA176](https://openairdocs.org/ntsb/ANC93IA176.md): Sikorsky C54A · Anita Bay, AK · Incident · No injuries · Incident investigation · Final report · Sep 12, 1993 · N44094 · Minor damage
  > The separation of the turbine blade from the power turbine disc.
- [NTSB ANC93LA077](https://openairdocs.org/ntsb/ANC93LA077.md): Piper PA-32-300 · Skagway, AK · Accident · Minor injuries · Limited investigation · Final report · Jun 2, 1993 · N8127K · Substantial damage
  > A total loss of engine power as a result of a fatigue failure of the #2 connecting rod. A factor which contributed to the accident was the lack of suitable terrain for the emergency landing.

Next page: https://openairdocs.org/ntsb.md?state=AK&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" = 'AK' 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=AK

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