# NTSB investigations: Hughes Helicopters HUGHES 369D

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 3 of 6 · 272 cases

## Cases, newest first

- [NTSB SEA01TA143](https://openairdocs.org/ntsb/SEA01TA143.md): Boeing Helicopters Div. H500D · Union Gap, WA · Accident · No injuries · Final report · Jul 24, 2001 · N8964T · Substantial damage
  > The complete loss of engine power at cruise for undetermined reasons. Factors include a landing area that was restricted/confined due to adjacent trees, and an intentional abrupt flare resulting in a hard landing.
- [NTSB IAD01TA051](https://openairdocs.org/ntsb/IAD01TA051.md): Hughes 369D · Taylorsville, KY · Accident · Minor injuries · Final report · Apr 29, 2001 · N50AP · Substantial damage
  > the flight instructor's inadequate aircraft control during a practice autorotation which resulted in a hard landing.
- [NTSB CHI01LA119](https://openairdocs.org/ntsb/CHI01LA119.md): Hughes 369D · Du Quoin, IL · Accident · Minor injuries · Limited investigation · Final report · Apr 18, 2001 · N713HT · Destroyed
  > loss of engine power for undetermined reasons, the pilot operating the helicopter outside of the height-velocity curve, and the pilot's failure to maintain control of the helicopter during the emergency landing. Factors relating to the accident were the…
- [NTSB FTW01LA073](https://openairdocs.org/ntsb/FTW01LA073.md): Hughes 369D · Canadian, TX · Accident · No injuries · Limited investigation · Final report · Mar 2, 2001 · N8356F · Substantial damage
  > the helicopter's encounter with loss of tail rotor effectiveness while hovering out-of-ground effect, and the pilot's failure to maintain control. A contributing factor was the soft terrain condition.
- [NTSB LAX01LA079](https://openairdocs.org/ntsb/LAX01LA079.md): Hughes 369D · Ely, NV · Accident · No injuries · Limited investigation · Final report · Jan 23, 2001 · N8353F · Substantial damage
  > The mechanic's inadvertent activation of the bleed valve, which resulted in a loss of engine oil and loss of engine power while in cruise flight.
- [NTSB DEN01TA019](https://openairdocs.org/ntsb/DEN01TA019.md): Hughes 369D · Montrose, CO · Accident · No injuries · Final report · Dec 6, 2000 · N411SM · Destroyed
  > the foreign object damage to a main rotor blade, while maneuvering.
- [NTSB LAX00FA123](https://openairdocs.org/ntsb/LAX00FA123.md): Boeing 369D · Rough And Ready, CA · Accident · Serious injuries · Field investigation · Final report · Mar 10, 2000 · N8351F · Substantial damage
  > a loss of engine power due to oil starvation. The oil starvation was due to the seizure and failure of the turbine element oil pump shaft, which was caused by debris from a failed bearing seizing the pump. A factor in the accident was the lack of a suitable…
- [NTSB IAD00WA004](https://openairdocs.org/ntsb/IAD00WA004.md): Hughes 369D · Cologne, Germany · Accident · 2 fatal · Foreign investigation · Nov 7, 1999 · N1096C · Destroyed
- [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 SEA99LA092](https://openairdocs.org/ntsb/SEA99LA092.md): Hughes 369D · Shelton, WA · Accident · No injuries · Limited investigation · Final report · Jun 22, 1999 · N1089Y · Substantial damage
  > The pilot's failure to maintain rotor RPM during an autorotation.
- [NTSB SEA99LA082](https://openairdocs.org/ntsb/SEA99LA082.md): Hughes 369D · Southbend, WA · Accident · Minor injuries · Limited investigation · Final report · Jun 8, 1999 · N8306F · Substantial damage
  > The complete loss of power, due to a failure of the compressor impeller disk. Factors include the low altitude of the helicopter at the time of the power loss, and the need to autorotate in a confined area.
- [NTSB LAX99TA088](https://openairdocs.org/ntsb/LAX99TA088.md): McDonnell Douglas 369D · Las Vegas, NV · Accident · No injuries · Final report · Jan 31, 1999 · N58431 · Substantial damage
  > The pilot's failure to properly judge the landing flare maneuver during a practice autorotative landing resulting in a hard landing.
- [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.
- [NTSB SEA99FA018](https://openairdocs.org/ntsb/SEA99FA018.md): Hughes 369D · Taholah, WA · Accident · Minor injuries · Field investigation · Final report · Dec 8, 1998 · N1096L · Substantial damage
  > Turbine wheel failure as the result of a low-cycle fatigue crack that initiated in a beyond-limits grinding gouge. Factors include improper maintenance by unknown parties and tree stumps that prohibited a successful emergency landing.
- [NTSB ANC98TA162](https://openairdocs.org/ntsb/ANC98TA162.md): Hughes 369D · Homer, AK · Accident · Serious injuries · Final report · Sep 27, 1998 · N1091P · Minor damage
  > The passenger not following the instructions given by the pilot. Contributing factors were the rising terrain and the pilot's diverted attention during the toe in landing.
- [NTSB SEA98LA160](https://openairdocs.org/ntsb/SEA98LA160.md): McDonnell Douglas 369D · Oso, WA · Accident · Minor injuries · Limited investigation · Final report · Aug 10, 1998 · N1096L · Substantial damage
  > The separation of the 90 degree gearbox and tail rotor assembly for undetermined reasons followed by the inability of the pilot-in-command to maintain control of the rotorcraft.
- [NTSB SEA98LA128](https://openairdocs.org/ntsb/SEA98LA128.md): Hughes 369D · Raymond, WA · Accident · 1 fatal · Limited investigation · Final report · Jul 9, 1998 · N5063G · No damage
  > The use of the improper long-line cable by the ground crew, and its subsequent separation from the helicopter.
- [NTSB LAX98LA079](https://openairdocs.org/ntsb/LAX98LA079.md): Hughes 369D · Pacific Ocean (Pacific Ocean) · Accident · 1 fatal · Limited investigation · Final report · Jan 24, 1998 · N521ZZ · Destroyed
  > The pilot's failure to adequately compensate for the wind condition and failure to maintain a proper rate of descent which resulted in the inadvertent loss of tail rotor effectiveness during a downwind turn.
- [NTSB SEA97LA118](https://openairdocs.org/ntsb/SEA97LA118.md): Hughes 369D · Moclips, WA · Accident · No injuries · Limited investigation · Final report · May 21, 1997 · N8306F · Substantial damage
  > Inadequate installation of the fuel control by company maintenance personnel and a loose nut on a line. A disconnected Pc line was a factor.
- [NTSB LAX97LA176](https://openairdocs.org/ntsb/LAX97LA176.md): Hughes 369D · Puako, HI · Accident · 2 fatal · Limited investigation · Final report · May 11, 1997 · N5105N · Destroyed
  > erosion of second stage stator vanes, inadequate maintenance inspection for the erosion, and subsequent fatigue failure of a stator vane, which resulted in loss of engine power and a forced landing on mountainous/hilly terrain. Also causal was: the pilot's…
- [NTSB LAX97FA107](https://openairdocs.org/ntsb/LAX97FA107.md): Hughes 369D · Milolii, HI · Accident · Serious injuries · Field investigation · Final report · Feb 21, 1997 · N505RM · Substantial damage
  > failure of the tail rotor for undetermined reason(s), resulting in tail rotor imbalance, separation of the tail rotor, and an autorotative landing on rough terrain with high vegetation. The lack of suitable terrain for a forced landing was a related factor.
- [NTSB LAX97GA105](https://openairdocs.org/ntsb/LAX97GA105.md): McDonnell Douglas 369D · Santee, CA · Accident · 1 fatal · Final report · Feb 17, 1997 · N5200Y · Substantial damage
  > Spatial disorientation and temporary visual impairment that led to a loss of aircraft control as result of difficulty to light adaptivity. Contributing was the crew coordination and inadequate night flight recurrency training.
- [NTSB SEA97LA032](https://openairdocs.org/ntsb/SEA97LA032.md): Hughes 369D · Forks, WA · Accident · Serious injuries · Limited investigation · Final report · Nov 16, 1996 · N5225C · Substantial damage
  > fuel contamination, which resulted in loss of engine power. Factors relating to the accident included: improper servicing of the helicopter, and a lack of suitable terrain for an emergency landing due to the proximity of trees.
- [NTSB LAX97LA039](https://openairdocs.org/ntsb/LAX97LA039.md): McDonnell Douglas 369D · Hana, HI · Accident · No injuries · Limited investigation · Final report · Nov 13, 1996 · N8625F · Substantial damage
  > subsequent failure of the spur adapter gearshaft (SAG), after 'retaining ring to compressor impeller machining' occurred and allowed the SAG to shift aft. The mechanism which induced the ring to impeller machining was not determined. Mountainous terrain in…
- [NTSB ANC96LA111](https://openairdocs.org/ntsb/ANC96LA111.md): McDonnell Douglas MD369D · Healy, AK · Accident · Minor injuries · Limited investigation · Final report · Aug 4, 1996 · N58269 · 2 aircraft · No damage
  > The inadequate visual outlook by the pilots of both aircraft, and their failure to see and avoid the other aircraft. A factor associated with the accident was sunglare affecting the helicopter pilot's vision.
- [NTSB SEA96LA144](https://openairdocs.org/ntsb/SEA96LA144.md): Hughes 369D · Mcminnville, OR · Accident · Minor injuries · Limited investigation · Final report · Jul 6, 1996 · N5110Y · Substantial damage
  > improper maintenance (replacement) and inspection of the engine fuel governor by company maintenance personnel, the pilot's inadequate preflight inspection, and a subsequent disconnect of the adjustable governor lever control rod, which disabled the engine…
- [NTSB ANC96TA092](https://openairdocs.org/ntsb/ANC96TA092.md): Hughes 369D · Ketchikan, AK · Accident · No injuries · Final report · Jun 26, 1996 · N5125Q · Substantial damage
  > The pilot's failure to maintain control of the helicopter. The pilot's selection of unsuitable terrain for landing was a factor in the accident.
- [NTSB ANC96LA045](https://openairdocs.org/ntsb/ANC96LA045.md): McDonnell Douglas H-369 · Delta Junction, AK · Accident · Minor injuries · Limited investigation · Final report · Apr 6, 1996 · N58268 · Substantial damage
  > loss of engine power for an undetermined reason.
- [NTSB CHI96FA091](https://openairdocs.org/ntsb/CHI96FA091.md): Hughes 369D · Dweese, NE · Accident · 2 fatal · Field investigation · Final report · Feb 19, 1996 · N5141Y · Destroyed
  > the pilot's improper in-flight planning and decision, and his lack of total experience in the type of operation. A factor was the crosswind.
- [NTSB LAX96FA076](https://openairdocs.org/ntsb/LAX96FA076.md): Hughes 369D · Feather Falls, CA · Accident · 1 fatal · Field investigation · Final report · Dec 20, 1995 · N8395F · Destroyed
  > the pilot's failure to jettison his external load after it came in contact with trees and terrain. The pilot's failure to maintain altitude/clearance above trees and hilly terrain was a related factor.
- [NTSB SEA96LA025](https://openairdocs.org/ntsb/SEA96LA025.md): Hughes 369D · Scotts Mills, OR · Accident · Minor injuries · Limited investigation · Final report · Nov 29, 1995 · N64DB · Substantial damage
  > The pilot's failure to maintain adequate clearance from the ground.
- [NTSB LAX95GA264](https://openairdocs.org/ntsb/LAX95GA264.md): Mcdonnell Douglas 369D · Hauula, HI · Accident · 3 fatal · Final report · Jul 21, 1995 · N1090S · Destroyed
  > the pilot's poor judgement by intentionally flying into adverse weather conditions in mountainous terrain with an external load and no observer which resulted in loss of aircraft control. Factors were pressure from the conditions/events and a lack of total…
- [NTSB ANC95LA107](https://openairdocs.org/ntsb/ANC95LA107.md): Hughes 500D · Paxson, AK · Accident · No injuries · Limited investigation · Final report · Jul 18, 1995 · N8639F · Substantial damage
  > Fuel starvation due to acrylamide contamination in the fuel control inlet filter. The lack of suitable terrain for a forced landing was a related factor.
- [NTSB LAX95FA225](https://openairdocs.org/ntsb/LAX95FA225.md): Hughes 369D · Highland, CA · Accident · Serious injuries · Field investigation · Final report · Jun 26, 1995 · N1089N · Substantial damage
  > the pilot's failure to verify the security of his passenger's cargo/personal belongings which departed the aircraft striking the tailrotor.
- [NTSB LAX94LA387](https://openairdocs.org/ntsb/LAX94LA387.md): Hughes 369D · Pacific Ocean (Pacific Ocean) · Accident · Serious injuries · Limited investigation · Final report · Sep 24, 1994 · N58400 · Destroyed
  > failure of the helicopter's main rotor pitch change link (control rod). The helicopter was not recovered and the Safety Board was unable to determine the pitch change link's failure mode.
- [NTSB LAX94FA372](https://openairdocs.org/ntsb/LAX94FA372.md): Hughes 369D · Genoa, NV · Accident · Minor injuries · Field investigation · Final report · Sep 22, 1994 · N58352 · Substantial damage
  > The pilot/operator's operation of the helicopter with a disconnected throttle on the right collective; the FAA inspector's inadequate preflight/pretakeoff checks of the flight control/throttle systems; and the pilot/operator's failure to adequately inform the…
- [NTSB BFO94LA155](https://openairdocs.org/ntsb/BFO94LA155.md): Hughes 369D · Butler, PA · Accident · No injuries · Limited investigation · Final report · Aug 28, 1994 · N5027P · Substantial damage
  > The malfunction of the emergency fuel vent and the exhaustion of the fuel supply which resulted in the loss of engine power.
- [NTSB LAX94LA241](https://openairdocs.org/ntsb/LAX94LA241.md): Hughes 369D · Kaneohe, HI · Accident · No injuries · Limited investigation · Final report · Jun 7, 1994 · N4943T · Substantial damage
  > the operator's and pilot's failure to ensure that the cargo net containing empty paper bags was sufficiently ballasted to prevent it from flying up into the tail rotor.
- [NTSB LAX94FA197](https://openairdocs.org/ntsb/LAX94FA197.md): Hughes 369D · Hanapepe, HI · Accident · 1 fatal · Field investigation · Final report · Apr 18, 1994 · N1103N · Destroyed
  > Inadequate turbine engine compressor cleaning procedures based on information in the manufacturer's service letter, and loss of engine power due to blockage of the fuel nozzle strainer with foreign material (sodium). Factors related to the accident were: the…
- [NTSB SEA94LA094](https://openairdocs.org/ntsb/SEA94LA094.md): Hughes 369D · Rimrock, WA · Accident · Minor injuries · Limited investigation · Final report · Apr 1, 1994 · N5211R · Substantial damage
  > Fuel exhaustion, the pilot in command's failure to refuel the aircraft, and the inability to successfully execute an auto- rotation landing because of the low altitude.
- [NTSB LAX94LA174](https://openairdocs.org/ntsb/LAX94LA174.md): Hughes 369D · Hi. Nat'L Park, HI · Accident · Minor injuries · Limited investigation · Final report · Mar 26, 1994 · N113RS · Substantial damage
  > the pilot's in-flight decision to maneuver the helicopter close to an active volcano steam vent which resulted in a whiteout condition from the steam, and the pilot's subsequent loss of visual contact with the ground.
- [NTSB MIA94T#A02](https://openairdocs.org/ntsb/MIA94T%23A02.md): Hughes 369E · Scotts Ferry, FL · Accident · No injuries · Class 3 · Final report · Mar 7, 1994 · N25MP · Substantial damage
- [NTSB LAX94LA076](https://openairdocs.org/ntsb/LAX94LA076.md): Hughes 369D · Waimea, Kauai, HI · Accident · No injuries · Limited investigation · Final report · Dec 22, 1993 · N115HD · Substantial damage
  > An inadequate engine compressor cleaning procedure specified in the manufacturer's service letter, which resulted in the total loss of engine power due to contamination, blockage, and collapse of the fuel nozzle inlet screen. Factors in the accident were: the…
- [NTSB LAX94LA041](https://openairdocs.org/ntsb/LAX94LA041.md): Hughes 369D · Pacific Ocean (Pacific Ocean) · Accident · 2 fatal · Limited investigation · Final report · Nov 7, 1993 · N5172K · Destroyed
  > An undetermined event that resulted in the accident.
- [NTSB LAX93LA323](https://openairdocs.org/ntsb/LAX93LA323.md): Hughes 369D · Chico, CA · Accident · Minor injuries · Limited investigation · Final report · Aug 15, 1993 · N8606F · Substantial damage
  > the observer's failure to properly secure stowed items in the rear compartment prior to takeoff and the resultant foreign object damage to the tail rotor system which precluded the pilot from maintaining directional control.
- [NTSB ANC93LA125](https://openairdocs.org/ntsb/ANC93LA125.md): Hughes 369D · Cordova, AK · Accident · No injuries · Limited investigation · Final report · Jul 24, 1993 · N3115Y · Substantial damage
  > A loss of engine power for undetermined reasons. A factor was the rough/uneven terrain.
- [NTSB LAX93LA261](https://openairdocs.org/ntsb/LAX93LA261.md): Mcdonnell Douglas 369D · Half Moon Bay, CA · Accident · 1 fatal · Limited investigation · Final report · Jun 19, 1993 · N277SP · Destroyed
  > the pilots failure to maintain an adequate clearance from the light tower and associated electrical power cables. Factors in the accident were; 1) pilot fatigue due to an excessively long duty day, and 2) glare from the lights which affected the pilot's…
- [NTSB LAX93LA249](https://openairdocs.org/ntsb/LAX93LA249.md): Hughes 369D · Kahului, HI · Accident · No injuries · Limited investigation · Final report · Jun 11, 1993 · N1113L · Substantial damage
  > The failure of the pilot to maintain adequate ground obstruction clearance while engaged in a cattle herding operation.
- [NTSB LAX93LA132](https://openairdocs.org/ntsb/LAX93LA132.md): Hughes 369D · Kahului, HI · Accident · Serious injuries · Limited investigation · Final report · Feb 22, 1993 · N58240 · Substantial damage
  > The pilots failure to maintain an adequate visual lookout for obstructions while performing a low altitude surveillance operation in a mountainous area, and, his failure to select an altitude sufficient to ensure clearance from all potential obstacles.
- [NTSB LAX93LA071](https://openairdocs.org/ntsb/LAX93LA071.md): Hughes 369D · Hilo, HI · Accident · No injuries · Limited investigation · Final report · Dec 22, 1992 · N113RS · Substantial damage
  > The bearing failures due to the operator's use of improper maintenance inspection and overhaul procedures by installing an unserviceable compressor module in the helicopter engine. Factors in the accident were the unsuitable nature of the terrain for the…

Next page: https://openairdocs.org/ntsb.md?model=4470706&page=4

## 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."mKey" IN (SELECT x.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' x WHERE x.aircraft_model_code IN ('4470706'))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb?model=4470706&page=3

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