# NTSB investigations: Unknown

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 19 of 40 · 1,981 cases

## Cases, newest first

- [NTSB FTW02LA134](https://openairdocs.org/ntsb/FTW02LA134.md): Robinson Tierra II · Hooker, OK · Accident · 1 fatal · Limited investigation · Final report · May 1, 2002 · N3960D · Destroyed
  > the loss of control for an undetermined reason, which resulted in an in-flight collision with terrain.
- [NTSB SEA02LA037](https://openairdocs.org/ntsb/SEA02LA037.md): Mooney M20C · Netarts, OR · Accident · 2 fatal · Limited investigation · Final report · Dec 11, 2001 · N5774Q · Destroyed
  > Reason for occurrence undetermined.
- [NTSB LAX02LA027](https://openairdocs.org/ntsb/LAX02LA027.md): Cessna 210K · North Las Vegas, NV · Accident · No injuries · Limited investigation · Final report · Nov 10, 2001 · N8232M · Substantial damage
  > The failure of maintenance personnel to properly diagnose the cause of a reported maintenance discrepancy resulting in the airplane being released from an annual inspection with a worn hydraulic pump which lacked sufficient output to operate the landing gear.…
- [NTSB SEA02FA011](https://openairdocs.org/ntsb/SEA02FA011.md): Cessna A185F · Lucile, ID · Accident · 1 fatal · Field investigation · Final report · Nov 6, 2001 · N61909 · Destroyed
  > The pilot's failure to maintain adequate altitude above, and/or clearance with, mountainous terrain during night visual flight rules flight. Factors included mountainous terrain and dark night light conditions.
- [NTSB NYC02LA019](https://openairdocs.org/ntsb/NYC02LA019.md): Norton/Cloeren Titan Tornado II · New Windsor, MD · Accident · 2 fatal · Limited investigation · Final report · Oct 30, 2001 · N996T · Destroyed
  > Loss of power for an undetermined reason.
- [NTSB MIA02FAMS1](https://openairdocs.org/ntsb/MIA02FAMS1.md): Ayres S2RHG-T65 · Accident · 1 fatal · Missing aircraft · Final report · Oct 1, 2001 · N3101G · Destroyed
  > The airplane and pilot are missing.
- [NTSB FTW01LA180](https://openairdocs.org/ntsb/FTW01LA180.md): Cessna 210 · Fort Smith, AR · Accident · No injuries · Limited investigation · Final report · Aug 12, 2001 · N8137L · Substantial damage
  > the overload fracture of the left main landing gear actuator which resulted in the loss of all hydraulic fluid and led to a wheels up landing.
- [NTSB CHI01FA257](https://openairdocs.org/ntsb/CHI01FA257.md): Schweizer 269C · Waterloo, IN · Accident · 2 fatal · Field investigation · Final report · Aug 5, 2001 · N6129M · Substantial damage
  > Aircraft control not maintained for undetermined reasons.
- [NTSB ANC01LA097](https://openairdocs.org/ntsb/ANC01LA097.md): Piper PA-12 · Anchorage, AK · Accident · No injuries · Limited investigation · Final report · Aug 2, 2001 · N7775H · Substantial damage
  > The loss of left brake pressure due to a missing hydraulic brake fitting.
- [NTSB SEA01LA141](https://openairdocs.org/ntsb/SEA01LA141.md): Taylor Smith Mini DSA-1 · Sultan, WA · Accident · No injuries · Limited investigation · Final report · Jul 22, 2001 · N53BT · Substantial damage
  > The separation/loss of the bolt and castle nut which connected the elevator bellcrank to the control stick pushrod resulting in a disconnect between the cockpit and the control surface and ultimately, the pilot's total loss of pitch control.
- [NTSB CHI01LA236](https://openairdocs.org/ntsb/CHI01LA236.md): Champion 7KCAB · Brooklyn, MI · Accident · Serious injuries · Limited investigation · Final report · Jul 22, 2001 · N7537F · Substantial damage
  > The forced landing for undetermined reasons. A factor to the accident was the corn crop.
- [NTSB ANC01FA084](https://openairdocs.org/ntsb/ANC01FA084.md): Maule M-5-235C · Bettles, AK · Accident · 4 fatal · Field investigation · Final report · Jul 15, 2001 · N9237E · Substantial damage
  > The pilot's inadvertent stall of the airplane during an unknown phase of flight.
- [NTSB SEA01LA131](https://openairdocs.org/ntsb/SEA01LA131.md): Rockwell International S-2R · Nez Perce, ID · Accident · 1 fatal · Limited investigation · Final report · Jul 14, 2001 · N5011X · Substantial damage
  > The pilot's failure to maintain terrain clearance for undetermined reasons.
- [NTSB FTW01FA151](https://openairdocs.org/ntsb/FTW01FA151.md): Ercoupe 415-CD · McAlester, OK · Accident · 1 fatal · Field investigation · Final report · Jun 24, 2001 · N3962H · Destroyed
  > the inadvertent stall by the pilot-in-command.
- [NTSB SEA01LA102](https://openairdocs.org/ntsb/SEA01LA102.md): Piper PA-18-105 Special · Wilbur, WA · Accident · 1 fatal · Limited investigation · Final report · May 22, 2001 · N7155K · Substantial damage
  > A collision with terrain for undetermined reasons.
- [NTSB SEA01FA085](https://openairdocs.org/ntsb/SEA01FA085.md): MBB BO-105C · Medford, OR · Accident · No injuries · Field investigation · Final report · May 5, 2001 · N105RH · Destroyed
  > A leaking engine oil outlet line fitting in the #1 engine compartment, resulting in an oil fire in the engine compartment.
- [NTSB SEA01FA070](https://openairdocs.org/ntsb/SEA01FA070.md): Cessna 182P · Fairfield, WA · Accident · 2 fatal · Field investigation · Final report · Apr 11, 2001 · N21565 · Substantial damage
  > The pilot's failure to maintain altitude and/or clearance over trees, resulting in a collision with trees, separation of a wing and uncontrolled collision with terrain. Factors included the pilot's inadequate preflight planning and preparation, dark night…
- [NTSB SEA01LA042](https://openairdocs.org/ntsb/SEA01LA042.md): Cessna 182R · Renton, WA · Accident · No injuries · Limited investigation · Final report · Jan 28, 2001 · N7568T · Substantial damage
  > The worn condition of the hydraulic pump gears which resulted in a continuous running pump, subsequent pump motor overheat and eventually the tripping of the pump motor circuit breaker. An additional cause was the pilot's failure to verify that the landing…
- [NTSB LAX01FAMS1](https://openairdocs.org/ntsb/LAX01FAMS1.md): Cessna 172N · Monterey, CA · Accident · 1 fatal · Missing aircraft · Final report · Jan 15, 2001 · N6452D · Destroyed
  > Undetermined.
- [NTSB ANC01FAMS1](https://openairdocs.org/ntsb/ANC01FAMS1.md): Champion 8GCBC · Juneau, AK · Accident · 2 fatal · Missing aircraft · Final report · Dec 27, 2000 · N7100C · Destroyed
  > Undetermined. Missing airplane.
- [NTSB MIA01LA026](https://openairdocs.org/ntsb/MIA01LA026.md): J and J Tukan · Hayesville, NC · Accident · 1 fatal · Limited investigation · Final report · Nov 11, 2000 · UNREG · Destroyed
  > The ultralight pilot's in-flight loss of control for unknown reasons resulting in an in-flight collision with the terrain.
- [NTSB SEA01FA017](https://openairdocs.org/ntsb/SEA01FA017.md): Cessna 425 · Idaho Falls, ID · Accident · 2 fatal · Field investigation · Final report · Nov 10, 2000 · N41054 · Substantial damage
  > The pilot-in-command's failure to maintain adequate airspeed with an asymmetric thrust condition, resulting in a loss of aircraft control. A factor was an asymmetric engine thrust condition, which was present for undetermined reasons.
- [NTSB MIA01FAMS1](https://openairdocs.org/ntsb/MIA01FAMS1.md): Cessna 150 · Missing, FL · Accident · 1 fatal · Missing aircraft · Final report · Oct 27, 2000 · N11214 · Destroyed
  > undetermined.
- [NTSB SEA01LA008](https://openairdocs.org/ntsb/SEA01LA008.md): Wildman Adventurer · Yelm, WA · Accident · 1 fatal · Limited investigation · Final report · Oct 23, 2000 · N567AW · Destroyed
  > A main rotor blade strike (impact) with both a pusher propeller blade and the rudder during an unknown phase of operation resulting in a loss of control and uncontrolled descent to terrain.
- [NTSB SEA00LA177](https://openairdocs.org/ntsb/SEA00LA177.md): Cessna 172P · Auburn, WA · Accident · No injuries · Limited investigation · Final report · Sep 3, 2000 · N531PC · Substantial damage
  > Damage to aircraft under unknown circumstances.
- [NTSB LAX00FA306](https://openairdocs.org/ntsb/LAX00FA306.md): Robinson R22 Beta · Watsonville, CA · Accident · 2 fatal · Field investigation · Final report · Aug 19, 2000 · N8313Z · Destroyed
  > The divergence of the main rotor from its normal plane of rotation for an undetermined reason, which resulted in mast bumping and rotor contact with the fuselage.
- [NTSB CHI00FAMS2](https://openairdocs.org/ntsb/CHI00FAMS2.md): Peters RAF 2000 · Manistique, MI · Accident · 1 fatal · Missing aircraft · Final report · Jul 29, 2000 · N11ZK · Destroyed
  > undetermined.
- [NTSB DEN00FA141](https://openairdocs.org/ntsb/DEN00FA141.md): Mooney M20K · Cheyenne, WY · Accident · 1 fatal · Field investigation · Final report · Jul 27, 2000 · N252KD · Destroyed
  > the airplane's in-flight collision with hilly terrain for undetermined reasons.
- [NTSB FTW00LA210](https://openairdocs.org/ntsb/FTW00LA210.md): Grumman-Schweizer G-164B · Ville Platte, LA · Accident · 1 fatal · Limited investigation · Final report · Jul 15, 2000 · N428KG · Destroyed
  > The loss of control for an undetermined reason.
- [NTSB SEA00LA116](https://openairdocs.org/ntsb/SEA00LA116.md): Davis/Crouch Avid MK IV · Concrete, WA · Accident · Serious injuries · Limited investigation · Final report · Jun 27, 2000 · N518DC · Substantial damage
  > Fracture of the engine's #1 connecting rod, resulting in a total loss of engine power. Factors were an engine overheat condition experienced at an undetermined time, and no suitable terrain for a forced landing.
- [NTSB FTW00LA169](https://openairdocs.org/ntsb/FTW00LA169.md): Cecil Thorp T-18 · West, TX · Accident · 1 fatal · Limited investigation · Final report · May 24, 2000 · N856CW · Destroyed
  > The loss of control for an undetermined reason.
- [NTSB ATL00LA042](https://openairdocs.org/ntsb/ATL00LA042.md): Piper PA-31-350 · Rock Hill, SC · Accident · No injuries · Limited investigation · Final report · Apr 19, 2000 · N41081 · Substantial damage
  > The maintenance personnel's failure to re-torque the engine driven fuel pump in accordance with an Airworthiness Directive that resulted in a fuel leak and a subsequent engine fire.
- [NTSB CHI00LA043](https://openairdocs.org/ntsb/CHI00LA043.md): McCarty Wittman W-8 Tailwind · Jamestown, ND · Accident · 2 fatal · Limited investigation · Final report · Dec 12, 1999 · N654 · Destroyed
  > the wing spar failure due to its inadequate construction by the owner/builder.
- [NTSB CHI00LA034](https://openairdocs.org/ntsb/CHI00LA034.md): Taylorcraft F-21 · Houlton, WI · Accident · No injuries · Limited investigation · Final report · Dec 1, 1999 · N2005J · Substantial damage
  > the mechanic failed to torque the rod cap bolt during the major engine overhaul. Factors relating to the accident included the rough field and the collapsed landing gear.
- [NTSB CHI00LA038](https://openairdocs.org/ntsb/CHI00LA038.md): Cessna 310Q · Moline, IL · Accident · No injuries · Limited investigation · Final report · Nov 26, 1999 · N7762Q · Substantial damage
  > the landing gear locking mechanism was not properly locked. Factors relating to this accident were the improper rigging of the gear and the runway marker.
- [NTSB CHI00FAMS1](https://openairdocs.org/ntsb/CHI00FAMS1.md): Cessna 175 · MI · Accident · 1 fatal · Missing aircraft · Final report · Nov 12, 1999 · N6533E · Destroyed
  > undetermined.
- [NTSB MIA00LA013](https://openairdocs.org/ntsb/MIA00LA013.md): British Aerospace HS 125-700A · Fayetteville, NC · Accident · No injuries · Limited investigation · Final report · Oct 19, 1999 · N34GG · Substantial damage
  > The overstress failure of the lugs of the cylinder head of the left main landing gear jack for undetermined reasons. Also, inability of the flight crew to extend the left main landing gear.
- [NTSB MIA00LA012](https://openairdocs.org/ntsb/MIA00LA012.md): Beech D35 · Indiantown, FL · Accident · No injuries · Limited investigation · Final report · Oct 16, 1999 · N2109D · Substantial damage
  > The reported unauthorized use of the airplane by an unknown person.
- [NTSB FTW00LA006](https://openairdocs.org/ntsb/FTW00LA006.md): WSK PZL Mielec M18 · Weldon, AR · Accident · 1 fatal · Limited investigation · Final report · Oct 5, 1999 · N4779G · Destroyed
  > The cause of the accident was undetermined.
- [NTSB SEA99LA149](https://openairdocs.org/ntsb/SEA99LA149.md): Bell 47G-2 · Benton City, WA · Accident · 1 fatal · Limited investigation · Final report · Aug 26, 1999 · N11VH · Destroyed
  > A loss of power for undetermined reasons and the failure of the pilot to maintain adequate rotor RPM following the power loss. Contributing factors were the pilot's lack of certification and total experience.
- [NTSB ANC99FAMS2](https://openairdocs.org/ntsb/ANC99FAMS2.md): Piper PA-28R-200 · Chitina, AK · Accident · 1 fatal · Missing aircraft · Final report · Aug 18, 1999 · N56877 · Destroyed
  > Undetermined.
- [NTSB ATL99LA117](https://openairdocs.org/ntsb/ATL99LA117.md): Quicksilver GT-500 · Ormond Beach, FL · Accident · No injuries · Limited investigation · Final report · Aug 13, 1999 · N5503M · Substantial damage
  > The in-flight collision with an object for an undetermined reasons. A factor was the stolen/unauthorized use of the airplane.
- [NTSB CHI99FA267](https://openairdocs.org/ntsb/CHI99FA267.md): Air Tractor AT502B · Giltner, NE · Accident · 1 fatal · Field investigation · Final report · Jul 30, 1999 · N5008Z · Destroyed
  > The pilot's inadequate visual lookout, and his failure to maintain clearance from the guy wire. A factor was the guy wire.
- [NTSB ANC99LA105](https://openairdocs.org/ntsb/ANC99LA105.md): Nix Avid Flyer · Chugiak, AK · Accident · No injuries · Limited investigation · Final report · Jul 18, 1999 · UNREG · Substantial damage
  > A loss of engine power for an undetermined reason.
- [NTSB SEA99FA113](https://openairdocs.org/ntsb/SEA99FA113.md): Alexander VAN'S RV-8 · Lafayette, OR · Accident · 1 fatal · Field investigation · Final report · Jul 10, 1999 · N41VA · Destroyed
  > Fatigue of the number two connecting rod end resulting in a fracture at the rod end and release from the crankshaft, an ensuing in-flight fuel fed fire, followed by the pilot's abandoning the aircraft in flight. A contributing factor was pressure on the pilot…
- [NTSB MIA99LA194](https://openairdocs.org/ntsb/MIA99LA194.md): Cessna 177RG · Jasper, AL · Accident · Minor injuries · Limited investigation · Final report · Jul 10, 1999 · N2619V · Substantial damage
  > the pilot inadvertently became disoriented and misjudged his position on the runway/airport, which resulted in him turning the airplane too soon, and subsequently impacting with a tree. Factors in this accident were a loss of electrical power for undetermined…
- [NTSB CHI99LA207](https://openairdocs.org/ntsb/CHI99LA207.md): Piper J-3C · Independence, IA · Accident · No injuries · Limited investigation · Final report · Jul 2, 1999 · N3371N · Substantial damage
  > The insufficient information from the weather forecast resulting in an in-flight encounter with turbulence/gusts and the subsequent precautionary landing. Contributing factors were the gusty/turbulent conditions and the terrain condition (crop).
- [NTSB SEA99LA081](https://openairdocs.org/ntsb/SEA99LA081.md): D. Wayne Smith Wayncraft 14 · Libby, MT · Accident · 1 fatal · Limited investigation · Final report · Jun 6, 1999 · N58WS · Substantial damage
  > Collision with terrain for undetermined reasons.
- [NTSB FTW99FA150](https://openairdocs.org/ntsb/FTW99FA150.md): Grumman-Schweizer G164-B · Brinkley, AR · Accident · 1 fatal · Field investigation · Final report · May 26, 1999 · N8285K · Destroyed
  > The pilot's inadvertent VFR flight into instrument meteorological conditions. Contributing factors were the pilots failure to maintain control of the aircraft, spatial disorientation, and the fog.
- [NTSB ANC99LA065](https://openairdocs.org/ntsb/ANC99LA065.md): Stinson 108 · Anchorage, AK · Accident · 1 fatal · Limited investigation · Final report · May 24, 1999 · N793C · Destroyed
  > Undetermined.

Next page: https://openairdocs.org/ntsb-phases/990/cases.md?page=20

## The whole list in SQL

Runs in DuckDB 1.2 or later on the release's Parquet files over HTTPS:

```sql
WITH phase_names(main, name) AS (VALUES (100, 'Prior to flight'), (150, 'Standing'), (200, 'Pushback/towing'), (250, 'Taxi'), (300, 'Takeoff'), (350, 'Initial climb'), (400, 'Enroute'), (450, 'Maneuvering'), (500, 'Approach'), (550, 'Landing'), (600, 'Emergency descent'), (650, 'Uncontrolled descent'), (700, 'Post-impact'), (750, 'After landing'), (800, 'Other'), (990, 'Unknown')),
  crosswalk(code, main, name) AS (VALUES (500, 150, 'Standing'), (501, 150, 'Standing - pre-flight'), (502, 150, 'Standing - starting engine(s)'), (503, 150, 'Standing - engine(s) operating'), (504, 150, 'Standing - engine(s) not operating'), (505, 150, 'Standing - idling rotors'), (510, 250, 'Taxi'), (511, 200, 'Taxi - pushback/tow'), (512, 250, 'Taxi - to takeoff'), (513, 250, 'Taxi - from landing'), (514, 250, 'Taxi - aerial'), (520, 300, 'Takeoff'), (521, 300, 'Takeoff - roll/run'), (522, 350, 'Takeoff - initial climb'), (523, 300, 'Takeoff - aborted'), (530, 400, 'Climb'), (531, 400, 'Climb - to cruise'), (540, 400, 'Cruise'), (541, 400, 'Cruise - normal'), (542, 400, 'Maneuvering - holding (IFR)'), (550, 400, 'Descent'), (551, 400, 'Descent - normal'), (552, 600, 'Descent - emergency'), (553, 650, 'Descent - uncontrolled'), (560, 500, 'Approach'), (561, 500, 'Approach - VFR pattern - downwind'), (562, 500, 'Approach - VFR pattern - base turn'), (563, 500, 'Approach - VFR pattern - base leg/base to final'), (564, 500, 'Approach - VFR pattern - final approach'), (565, 500, 'Go-around (VFR)'), (566, 500, 'Approach - IAF to FAF/outer marker (IFR)'), (567, 500, 'Approach - FAF/outer marker to threshold (IFR)'), (568, 500, 'Circling (IFR)'), (569, 500, 'Missed approach (IFR)'), (570, 550, 'Landing'), (571, 550, 'Landing - flare/touchdown'), (572, 550, 'Landing - roll'), (573, 550, 'Landing - aborted'), (574, 550, 'Emergency landing'), (575, 550, 'Emergency landing after takeoff'), (576, 600, 'Emergency descent/landing'), (580, 450, 'Maneuvering'), (581, 450, 'Maneuvering - aerial application'), (582, 450, 'Maneuvering - turn to reverse direction'), (583, 450, 'Maneuvering - turn to landing area (emergency)'), (590, 450, 'Hover'), (591, 450, 'Hover - in ground effect'), (592, 450, 'Hover - out of ground effect'), (600, 800, 'Other'), (610, 990, 'Unknown')),
  current_codes AS (
    SELECT e.case_mkey, TRY_CAST(e."tier1Number" AS INTEGER) AS code,
      row_number() OVER (PARTITION BY e.case_mkey ORDER BY coalesce(e."isDefiningEvent", false) DESC, e.position) AS n
    FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' e
    WHERE e.aircrafts_position = 1 AND e."tier1Number" GLOB '[1-9][0-9]*'
      AND (e."isDefiningEvent" OR e.case_mkey IN (SELECT "mKey" FROM 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' WHERE "isPre1982"))
  ),
  phases AS (
    SELECT case_mkey, 'current' AS scheme, code, CASE WHEN code >= 990 THEN 990 ELSE code // 50 * 50 END AS main
    FROM current_codes WHERE n = 1
    UNION ALL
    SELECT o.case_mkey, 'older', o."phaseOfFlightCode", w.main
    FROM 'https://openairdocs.org/data/latest/ntsb_occurrences.parquet' o JOIN crosswalk w ON w.code = o."phaseOfFlightCode"
    WHERE o.aircrafts_position = 1 AND o."occurrenceNumber" = 1 AND o.case_mkey NOT IN (SELECT case_mkey FROM current_codes)
  ),
  case_phases AS (
    SELECT p.*, c."eventDate", c."highestInjuryLevel" = 'Fatal' AS fatal, a.aircraft_model_code
    FROM phases p JOIN 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c ON c."mKey" = p.case_mkey
    LEFT JOIN 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a ON a.case_mkey = p.case_mkey AND a.position = 1
    WHERE c."eventDate" >= DATE '1962-01-01' AND p.main IN (SELECT main FROM phase_names)
  )
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 case_mkey FROM case_phases WHERE main = 990)
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-phases/990/cases?page=19

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