# 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 21 of 40 · 1,985 cases

## Cases, newest first

- [NTSB CHI96LA352](https://openairdocs.org/ntsb/CHI96LA352.md): Cessna 172RG · Aurora, IL · Accident · No injuries · Limited investigation · Final report · Sep 17, 1996 · N966LA · Substantial damage
  > undetermined.
- [NTSB CHI96FA334](https://openairdocs.org/ntsb/CHI96FA334.md): Thocker RV-4 · Muncie, IN · Accident · 2 fatal · Field investigation · Final report · Sep 17, 1996 · N952JT · Destroyed
  > was the in-flight disconnection of the horizontal and vertical stabilizer forward attachments.
- [NTSB NYC96FA182](https://openairdocs.org/ntsb/NYC96FA182.md): Piper PA-28-140 · Frankford Twnsp, NJ · Accident · 1 fatal · Field investigation · Final report · Sep 7, 1996 · N422FL · Destroyed
  > the pilot's inadequate preflight planning/preparation by not obtaining a preflight weather briefing, his VFR flight into instrument meteorological conditions (IMC), and his failure to maintain control of the aircraft after becoming spatial disoriented.…
- [NTSB CHI96FA301](https://openairdocs.org/ntsb/CHI96FA301.md): Bellanca 7GCAA · Hinckley, IL · Accident · 2 fatal · Field investigation · Final report · Aug 19, 1996 · N5026Q · Destroyed
  > the instructor pilot exceeded the design stress limits of the aircraft which resulted in the overload failure of the wing. A factor was that the weight and balance of the aircraft was exceeded by the instructor pilot.
- [NTSB ANC96FAMS1](https://openairdocs.org/ntsb/ANC96FAMS1.md): Grumman G21-G · Dutch Harbor, AK · Accident · 2 fatal · Missing aircraft · Final report · Aug 12, 1996 · N660PA · Destroyed
  > Undetermined.
- [NTSB SEA96FA170](https://openairdocs.org/ntsb/SEA96FA170.md): Piper PA-28R-200 · Libby, MT · Accident · 3 fatal · Field investigation · Final report · Jul 26, 1996 · N3071R · Destroyed
  > collision with rising mountainous terrain for unknown reason(s).
- [NTSB MIA96FA186](https://openairdocs.org/ntsb/MIA96FA186.md): Cessna 152 · New Smyrna Bch, FL · Accident · 1 fatal · Field investigation · Final report · Jul 15, 1996 · N65514 · Destroyed
  > the pilot's impairment of judgment and performance because of gastroenteritis and use of the prescription drug Phenergan (promethazine).
- [NTSB SEA96LA164](https://openairdocs.org/ntsb/SEA96LA164.md): Piper PA-46-350P · Hillsboro, OR · Accident · No injuries · Limited investigation · Final report · Jul 8, 1996 · N58VJ · Substantial damage
  > blockage of the vents to both wing fuel tanks, after unknown personnel failed to remove tape (protective covering) from the vents, which resulted in collapsed fuel tanks (and wing damage).
- [NTSB LAX96LA247](https://openairdocs.org/ntsb/LAX96LA247.md): Cessna R172K · Oroville, CA · Accident · Serious injuries · Limited investigation · Final report · Jun 26, 1996 · N1133V · Substantial damage
  > undetermined.
- [NTSB ATL96FA094](https://openairdocs.org/ntsb/ATL96FA094.md): Cessna 172N · Arlington, TN · Accident · 1 fatal · Field investigation · Final report · Jun 14, 1996 · N73941 · Substantial damage
  > The pilot's failure to maintain clearance above the trees. A factor was the dark night.
- [NTSB ANC96FA081](https://openairdocs.org/ntsb/ANC96FA081.md): Robinson R-22 Mariner · Mekoryuk, AK · Accident · 1 fatal · Field investigation · Final report · Jun 4, 1996 · N113CF · Destroyed
  > A loss of engine power due to fuel contamination found in the fuel supply and helicopter fuel system. Factors in the accident were the pilot's inadequate filtration (servicing of the helicopter) of the fuel supply, and the pilot's inadequate performance of…
- [NTSB ANC96FA079](https://openairdocs.org/ntsb/ANC96FA079.md): Republic RC-3 Seabee · Ketchikan, AK · Accident · 2 fatal · Field investigation · Final report · May 25, 1996 · N99FJ · Destroyed
  > the airplane crashed for undetermined reason(s).
- [NTSB ATL96FAMS1](https://openairdocs.org/ntsb/ATL96FAMS1.md): Aero Commander 500-B · Missing · Accident · 3 fatal · Missing aircraft · Final report · May 2, 1996 · N50GV · Destroyed
  > Undetermined.
- [NTSB FTW96LA106](https://openairdocs.org/ntsb/FTW96LA106.md): Bellanca 17-30A · Belen, NM · Accident · No injuries · Limited investigation · Final report · Jan 13, 1996 · N4109B · Substantial damage
  > previous damage, looseness of the main landing gear, and inadequate maintenance.
- [NTSB FTW96LA044](https://openairdocs.org/ntsb/FTW96LA044.md): Cessna 150M · Port Arthur, TX · Accident · 1 fatal · Limited investigation · Final report · Oct 27, 1995 · N714AS · Destroyed
  > Undetermined.
- [NTSB SEA95LA219](https://openairdocs.org/ntsb/SEA95LA219.md): Pietenpol AIR-CAMPER · Redmond, OR · Accident · No injuries · Limited investigation · Final report · Sep 12, 1995 · N18GH · Substantial damage
  > a loss of engine power for undetermined reasons.
- [NTSB SEA95FAMS1](https://openairdocs.org/ntsb/SEA95FAMS1.md): Piper PA-28-140 · Missing, WA · Accident · 3 fatal · Missing aircraft · Final report · Sep 4, 1995 · N571PA · Destroyed
  > Undetermined until the Missing aircraft is located.
- [NTSB CHI95FA212](https://openairdocs.org/ntsb/CHI95FA212.md): Taylorcraft BC-65 · Plato Center, IL · Accident · 1 fatal · Field investigation · Final report · Jul 8, 1995 · N1027K · Substantial damage
  > the pilot not maintaining an adequate fuel supply, and not maintaining airspeed.
- [NTSB CHI95LA211](https://openairdocs.org/ntsb/CHI95LA211.md): First Strike Bobcat · Burlington, IA · Accident · 1 fatal · Limited investigation · Final report · Jul 7, 1995 · N412LF · Destroyed
  > fatigue failure of a copper fuel line at the carburetor ferrule fitting, which resulted in fuel starvation. The proximity of trees was a related factor.
- [NTSB MIA95LA166](https://openairdocs.org/ntsb/MIA95LA166.md): Piper PA-23-250 · Orlando, FL · Accident · No injuries · Limited investigation · Final report · Jun 28, 1995 · N25AT · Substantial damage
  > Unknown.
- [NTSB CHI95LA175](https://openairdocs.org/ntsb/CHI95LA175.md): Tom Kilgore KR-2 · Alanson, MI · Accident · 1 fatal · Limited investigation · Final report · Jun 8, 1995 · N49TK · Destroyed
  > improper planning/decision by the pilot, which resulted in fuel exhaustion due to an inadequate supply of fuel, and failure of the pilot to maintain control of the airplane, which resulted in a stall/spin and collision with the ground.
- [NTSB MIA95LA144](https://openairdocs.org/ntsb/MIA95LA144.md): Piper PA-32-260 · Vieques, PR · Accident · 1 fatal · Limited investigation · Final report · Jun 2, 1995 · N41528 · Substantial damage
  > Undetermined.
- [NTSB LAX95LA190](https://openairdocs.org/ntsb/LAX95LA190.md): Stol UC-1 · Saipan, Sark · Accident · 3 fatal · Limited investigation · Final report · May 21, 1995 · N108CA · Destroyed
  > an inflight collision with the ocean for undetermined reasons.
- [NTSB LAX95LA179](https://openairdocs.org/ntsb/LAX95LA179.md): Cessna 152 · Palos Verdes, CA · Accident · 1 fatal · Limited investigation · Final report · Apr 28, 1995 · N49058 · Destroyed
  > that the pilot initiated the flight into known adverse weather, and inadvertent flight into instrument meteorological conditions.
- [NTSB CHI95LA343](https://openairdocs.org/ntsb/CHI95LA343.md): Beech C23 · Waukegan, IL · Accident · 1 fatal · Limited investigation · Final report · Mar 31, 1995 · N23990 · Destroyed
  > The pilot's VFR flight into instrument meteorolical conditions.
- [NTSB MIA95FAMS2](https://openairdocs.org/ntsb/MIA95FAMS2.md): Cessna 152 · Missing · Accident · 2 fatal · Missing aircraft · Final report · Feb 28, 1995 · N25900 · Destroyed
  > Undetermined. The airplane and occupants have not been located.
- [NTSB LAX95LA108](https://openairdocs.org/ntsb/LAX95LA108.md): Cessna 182Q · San Francisco, CA · Accident · 3 fatal · Limited investigation · Final report · Feb 12, 1995 · N4875N · Destroyed
  > an inflight collision with water for undetermined reasons.
- [NTSB LAX95LA063](https://openairdocs.org/ntsb/LAX95LA063.md): McDonnell Douglas 500 · Chuuk Island (Pacific Ocean) · Accident · 2 fatal · Limited investigation · Final report · Dec 29, 1994 · N9128F · Destroyed
  > undetermined.
- [NTSB MIA95FAMS1](https://openairdocs.org/ntsb/MIA95FAMS1.md): Piper PA-28-161 · Missing, FL · Accident · 1 fatal · Missing aircraft · Final report · Dec 25, 1994 · N5916V · Destroyed
  > Undetermined.
- [NTSB ATL95FA023](https://openairdocs.org/ntsb/ATL95FA023.md): Beech C23 · Statesboro, GA · Accident · 1 fatal · Field investigation · Final report · Dec 4, 1994 · N9790L · Substantial damage
  > The pilot's impairment of judgment and performance due to alcohol, improper planning/decision, flight into adverse weather conditions, and failure to maintain proper altitude/clearance from wooded terrain. Factors related to the accident were: darkness and…
- [NTSB ANC95FAMS1](https://openairdocs.org/ntsb/ANC95FAMS1.md): Cessna 206 · Kenai, AK · Accident · 1 fatal · Missing aircraft · Final report · Dec 3, 1994 · N5282U · Substantial damage
  > Undetermined.
- [NTSB ATL95FA013](https://openairdocs.org/ntsb/ATL95FA013.md): Cessna 152 · Dresden, TN · Accident · 2 fatal · Field investigation · Final report · Nov 9, 1994 · N24834 · Destroyed
  > The pilot in command's (CFI) impairment of judgment and performance due to alcohol and drugs, which led to his failure to maintain separation from terrain.
- [NTSB MIA94FAMS2](https://openairdocs.org/ntsb/MIA94FAMS2.md): Piper PA-23-250 · Missing · Accident · 5 fatal · Missing aircraft · Final report · Sep 19, 1994 · N6844Y · Destroyed
  > Undetermined.
- [NTSB ANC94LA133](https://openairdocs.org/ntsb/ANC94LA133.md): Champion 7ECA · Fairbanks, AK · Accident · No injuries · Limited investigation · Final report · Sep 10, 1994 · N68522 · Substantial damage
  > Undetermined.
- [NTSB SEA94FA237](https://openairdocs.org/ntsb/SEA94FA237.md): Piper J3C-65 · Dixon, MT · Accident · 2 fatal · Field investigation · Final report · Sep 9, 1994 · N42056 · Destroyed
  > The pilot in command's allowing the aircraft airspeed to decrease below the stall speed.
- [NTSB MIA94FAMS1](https://openairdocs.org/ntsb/MIA94FAMS1.md): Piper PA-32-300 · Missing · Accident · 2 fatal · Missing aircraft · Final report · Aug 28, 1994 · N69118 · Destroyed
  > Undetermined.
- [NTSB ANC94LA127](https://openairdocs.org/ntsb/ANC94LA127.md): Piper PA-12 · Eagle, AK · Accident · No injuries · Limited investigation · Final report · Jul 30, 1994 · N3849M · Substantial damage
  > Undetermined.
- [NTSB BFO94LA085](https://openairdocs.org/ntsb/BFO94LA085.md): Pecchio Marchetti 263MP · East Moriches, NY · Accident · 1 fatal · Limited investigation · Final report · Jun 2, 1994 · N263MP · Destroyed
  > the loss of control for undetermined reasons resulting in an uncontrolled descent and a subsequent collision with trees.
- [NTSB CHI94FA330](https://openairdocs.org/ntsb/CHI94FA330.md): Bell 47G-5A · Wisconsin Rpds, WI · Accident · 1 fatal · Field investigation · Final report · Mar 22, 1994 · N2991W · Destroyed
  > Undetermined.
- [NTSB CHI94FAMS1](https://openairdocs.org/ntsb/CHI94FAMS1.md): Cessna 172I · Kalamazoo, MI · Accident · 1 fatal · Missing aircraft · Final report · Nov 21, 1993 · N35549 · Destroyed
  > Undetermined.
- [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 MIA94LA013](https://openairdocs.org/ntsb/MIA94LA013.md): Beech A36 · Ormond Beach, FL · Accident · 3 fatal · Limited investigation · Final report · Oct 29, 1993 · N888AS · Destroyed
  > Poor judgement of the pilot, due to consumption of alcohol and use of drugs, and his failure (or inability) to maintain altitude (or clearance) above water at night. Darkness was a related factor.
- [NTSB MIA94FA008](https://openairdocs.org/ntsb/MIA94FA008.md): Beech 60 · Miami, FL · Accident · Serious injuries · Field investigation · Final report · Oct 17, 1993 · N7131D · Substantial damage
  > Inadequate preflight by the pilot, and his failure to assure that proper maintenance/annual inspection was attained. Factors related to the accident were: water and other contamination in the fuel supply, lack of continuity in two ignition leads, loose left…
- [NTSB MIA93FAMS2](https://openairdocs.org/ntsb/MIA93FAMS2.md): Cessna 152 · FL · Accident · 1 fatal · Missing aircraft · Final report · Sep 30, 1993 · N93261 · Destroyed
  > undetermined.
- [NTSB SEA93FAMS1](https://openairdocs.org/ntsb/SEA93FAMS1.md): Cessna 182L · Missing, WA · Accident · 2 fatal · Missing aircraft · Final report · Aug 17, 1993 · N3106R · Destroyed
  > Undetermined.
- [NTSB BFO93LA143](https://openairdocs.org/ntsb/BFO93LA143.md): Cessna 150L · Danielson, CT · Accident · Serious injuries · Limited investigation · Final report · Jul 31, 1993 · N21918 · Destroyed
  > Undetermined.
- [NTSB ANC93LA143](https://openairdocs.org/ntsb/ANC93LA143.md): Artic S-1B2 · Johnson Glacier, AK · Accident · 2 fatal · Limited investigation · Final report · Jul 31, 1993 · N59AT · Destroyed
  > The pilot's attempted flight in an airplane which exceeded the maximum allowable weight. The high mountainous terrain was a factor.
- [NTSB LAX93LA309](https://openairdocs.org/ntsb/LAX93LA309.md): Cessna 182P · Dayton, NV · Accident · 1 fatal · Limited investigation · Final report · Jul 30, 1993 · N8185M · Destroyed
  > The pilot's failure to maintain an altitude sufficient to clear terrain due to alcohol and drug impairment.
- [NTSB ANC93LA130](https://openairdocs.org/ntsb/ANC93LA130.md): Cessna 170 · Dry Bay, AK · Accident · 2 fatal · Limited investigation · Final report · Jul 30, 1993 · N8190A · Destroyed
  > Undetermined.
- [NTSB LAX93LA307](https://openairdocs.org/ntsb/LAX93LA307.md): Cessna 150M · Santa Margarita, CA · Accident · Serious injuries · Limited investigation · Final report · Jul 29, 1993 · N45138 · Destroyed
  > the pilot's failure to maintain adequate airspeed which resulted in an inadvertent stall.

Next page: https://openairdocs.org/ntsb-phases/990/cases.md?page=22

## 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=21

---
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, except the copies of manufacturers’ service documents, which belong to their rights holders.