# 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 20 of 40 · 1,981 cases

## Cases, newest first

- [NTSB SEA99LA063](https://openairdocs.org/ntsb/SEA99LA063.md): Lake LA-4 · Coeur D'Alene, ID · Accident · No injuries · Limited investigation · Final report · May 15, 1999 · N152WB · Substantial damage
  > The fatigue failure of a repair weld on one of the engine pylon mount straps and the resultant reduction in directional control. Factors include an inadequate repair of the strap, variable wind speeds and sudden wind shifts.
- [NTSB ANC99FAMS1](https://openairdocs.org/ntsb/ANC99FAMS1.md): Piper PA-24-260 · Juneau, AK · Accident · 2 fatal · Missing aircraft · Final report · May 2, 1999 · N8694P · Destroyed
  > Undetermined. Missing aircraft.
- [NTSB CHI99FA129](https://openairdocs.org/ntsb/CHI99FA129.md): Cessna 152 · Superior, WI · Accident · 2 fatal · Field investigation · Final report · Apr 14, 1999 · N4611B · Destroyed
  > the Certified Flight Instructor failed to maintain control of the airplane.
- [NTSB SEA99LA043](https://openairdocs.org/ntsb/SEA99LA043.md): Piper PA-28-140 · Rexburg, ID · Accident · Serious injuries · Limited investigation · Final report · Mar 13, 1999 · N9578W · Substantial damage
  > A loss of engine power for undetermined reasons.
- [NTSB FTW99LA086](https://openairdocs.org/ntsb/FTW99LA086.md): Keil Jaeger D-IX · Santa Fe, TX · Accident · 1 fatal · Limited investigation · Final report · Feb 28, 1999 · N257JK · Destroyed
  > The separation of the right upper aileron for an undetermined reason.
- [NTSB NYC99FA007](https://openairdocs.org/ntsb/NYC99FA007.md): Cessna 172G · Bennington, VT · Accident · 2 fatal · Field investigation · Final report · Oct 12, 1998 · N1330F · Destroyed
  > The pilot's VFR flight into IMC. Contributing factors were the pilot's lack of recent experience, mountainous/hilly terrain, and clouds.
- [NTSB CHI99LA009](https://openairdocs.org/ntsb/CHI99LA009.md): Cessna 150F · Muskegon, MI · Accident · No injuries · Limited investigation · Final report · Oct 5, 1998 · N8655S · Substantial damage
  > poor in-flight planning by an unqualified person which resulted in fuel exhaustion. A factor was the swamp in which the forced landing was made.
- [NTSB ANC99LA005](https://openairdocs.org/ntsb/ANC99LA005.md): Beech G-35 · Neah Bay, WA · Accident · 1 fatal · Limited investigation · Final report · Oct 4, 1998 · N4479D · Destroyed
  > Undetermined. Missing Aircraft.
- [NTSB ANC98FA168](https://openairdocs.org/ntsb/ANC98FA168.md): Cessna TU-206G · Ketchikan, AK · Accident · 1 fatal · Field investigation · Final report · Sep 29, 1998 · N4820U · Destroyed
  > The pilot's continued VFR flight into instrument meteorological conditions. Contributing factors were low ceilings and mountainous/hilly terrain.
- [NTSB ANC98FA152](https://openairdocs.org/ntsb/ANC98FA152.md): Cessna 207 · Kotzebue, AK · Accident · 1 fatal · Field investigation · Final report · Sep 17, 1998 · N1809Q · Destroyed
  > The pilot's continued VFR flight into instrument meteorological conditions. Factors associated with the accident were low ceilings, mountainous/hilly terrain features, rain, and fog.
- [NTSB MIA98LA242](https://openairdocs.org/ntsb/MIA98LA242.md): Cessna 177RG · Covington, GA · Accident · No injuries · Limited investigation · Final report · Sep 5, 1998 · N2679V · Substantial damage
  > slippage of the No. 3 connecting rod bearing resulting in blockage of the oil port, oil starvation, and subsequent connecting rod failure. A factor was the fence.
- [NTSB ATL98FAMS1](https://openairdocs.org/ntsb/ATL98FAMS1.md): Piper PA-28-181 · Missing · Accident · 4 fatal · Missing aircraft · Final report · Aug 18, 1998 · N25626 · Destroyed
  > The aircraft is missing.
- [NTSB FTW98FA340](https://openairdocs.org/ntsb/FTW98FA340.md): Piper J3C-85 · Seminole, TX · Accident · 1 fatal · Field investigation · Final report · Jul 31, 1998 · N7018H · Destroyed
  > The pilot's failure to maintain aircraft control.
- [NTSB CHI98LA368](https://openairdocs.org/ntsb/CHI98LA368.md): Grumman American AA-5B · Deadwood, SD · Accident · 2 fatal · Limited investigation · Final report · Jul 26, 1998 · N4535P · Destroyed
  > The pilot's failure to maintain adequate clearance from the trees.
- [NTSB SEA98LA145](https://openairdocs.org/ntsb/SEA98LA145.md): Baggarley Glasair II-FT · Vernonia, OR · Accident · 1 fatal · Limited investigation · Final report · Jul 20, 1998 · N31066 · Substantial damage
  > A loss of aircraft control for undetermined reasons.
- [NTSB FTW98FA307](https://openairdocs.org/ntsb/FTW98FA307.md): Cessna 172N · Lincoln, TX · Accident · Serious injuries · Field investigation · Final report · Jul 11, 1998 · N5632E · Destroyed
  > The #3 cylinder exhaust valve rocker arm fulcrum retaining stud backing out of its stud-tapped hole due to the improper tapping of the stud hole by unknown maintenance personnel. Contributing factors were the transmission wire, sign and gasoline pump.
- [NTSB MIA99FA050](https://openairdocs.org/ntsb/MIA99FA050.md): Cessna 172L · Macclenny, FL · Accident · 2 fatal · Field investigation · Final report · Jun 23, 1998 · N3853Q · Destroyed
  > The student pilot's attempted VFR flight into instrument meteorological conditions, resulting in a subsequent in-flight collision with trees and terrain. Contributing factors were, haze/smoke, the student pilot's failure to obtain a preflight weather…
- [NTSB NYC98FA107](https://openairdocs.org/ntsb/NYC98FA107.md): Ercoupe ERCO-415C · New Lisbon, NY · Accident · 2 fatal · Field investigation · Final report · May 16, 1998 · N3230H · Destroyed
  > Detonation within the No. 2 cylinder resulting in melting and breaching of the piston, and the pilot's selection of unsuitable terrain for landing. Contributing factors were the uphill terrain encountered during the landing and the visual perception…
- [NTSB ANC98FA043](https://openairdocs.org/ntsb/ANC98FA043.md): Taylorcraft BL12 · Sitka, AK · Accident · 1 fatal · Field investigation · Final report · Apr 28, 1998 · N33902 · Destroyed
  > The pilot's attempted VFR flight into instrument meteorological conditions. Contributing factors were clouds, the pilot's lack of instrument flight experience, obscuration and mountainous terrain.
- [NTSB ATL98FA063](https://openairdocs.org/ntsb/ATL98FA063.md): William Sargent Lancair 235 · Newport, TN · Accident · 2 fatal · Field investigation · Final report · Apr 17, 1998 · N813Y · Destroyed
  > The pilot's attempt to operate in instrument meteorological conditions and his failure to maintain clearance with the surrounding terrain. Contributing factors were clouds and the mountainous/hilly terrain.
- [NTSB SEA98FA101](https://openairdocs.org/ntsb/SEA98FA101.md): Piper PA-46-350P · Bigfork, MT · Accident · 2 fatal · Field investigation · Final report · Apr 11, 1998 · N9247W · Destroyed
  > The pilot's failure to maintain terrain clearance for undetermined reasons. Contributing factors were the mountainous terrain, trees, dark night conditions, clouds and pilot fatigue.
- [NTSB ANC98GA036](https://openairdocs.org/ntsb/ANC98GA036.md): Cessna 185F · Nightmute, AK · Accident · 2 fatal · Final report · Apr 9, 1998 · N5485R · Destroyed
  > The pilot's continued VFR flight into instrument meteorological conditions which resulted in spatial disorientation and subsequent loss of aircraft control. Factors in the accident were meteorological conditions consisting of low ceilings, and blowing snow,…
- [NTSB FTW98FA167](https://openairdocs.org/ntsb/FTW98FA167.md): Bell 206B · Round Top, TX · Accident · 1 fatal · Field investigation · Final report · Apr 2, 1998 · N7734A · Destroyed
  > The pilot's attempted VFR flight into instrument meteorological conditions. Contributing factors were fog, low ceilings, and trees.
- [NTSB MIA98FAMS2](https://openairdocs.org/ntsb/MIA98FAMS2.md): Cessna 182H · Missing · Accident · 1 fatal · Missing aircraft · Final report · Mar 28, 1998 · N8460S · Destroyed
  > Undetermined.
- [NTSB CHI98FA099](https://openairdocs.org/ntsb/CHI98FA099.md): Cessna T210L · Orleans, IN · Accident · 1 fatal · Field investigation · Final report · Mar 5, 1998 · N2546S · Destroyed
  > The pilot's attempted VFR flight into instrument meteorological conditions and his subsequent failure to maintain clearance with trees. Contributing factors were the pilot's impairment from prescription drugs, low ceilings, fog, trees, and hilly terrain.
- [NTSB LAX98FA064](https://openairdocs.org/ntsb/LAX98FA064.md): Piper PA-11 · Willow Beach, AZ · Accident · 1 fatal · Field investigation · Final report · Dec 30, 1997 · N5532H · Destroyed
  > The pilot's failure to maintain control of the aircraft for undetermined reasons.
- [NTSB CHI98LA126](https://openairdocs.org/ntsb/CHI98LA126.md): Cessna 177 · Ft. Leonardwood, MO · Accident · 1 fatal · Limited investigation · Final report · Dec 29, 1997 · N30255 · Destroyed
  > The pilot's failure to maintain adequate obstacle clearance and his inadequate inflight decision which resulted in VFR flight in to instrument meteorological conditions. The pilot's overconfidence in his ability is a contributing factor.
- [NTSB MIA98FAMS1](https://openairdocs.org/ntsb/MIA98FAMS1.md): Beech G35 · Missing · Accident · 2 fatal · Missing aircraft · Final report · Dec 3, 1997 · N4404D · Destroyed
  > undetermined.
- [NTSB ANC98LA001](https://openairdocs.org/ntsb/ANC98LA001.md): Piper PA-22-160 · Sterling, AK · Accident · 1 fatal · Limited investigation · Final report · Oct 3, 1997 · N8955D · Destroyed
  > Undetermined.
- [NTSB MIA97FA248](https://openairdocs.org/ntsb/MIA97FA248.md): Bell 47G · Saluda, SC · Accident · 2 fatal · Field investigation · Final report · Sep 19, 1997 · N70747 · Destroyed
  > in-flight collision with a tree, for undetermined reason(s).
- [NTSB CHI97FA308](https://openairdocs.org/ntsb/CHI97FA308.md): Piper PA-28-235 · St. Ignaces, MI · Accident · 2 fatal · Field investigation · Final report · Sep 14, 1997 · N9399W · Destroyed
  > The noninstrument-rated pilot's improper decision to depart in instrument meteorological conditions, which resulted in impact with terrain.
- [NTSB CHI97FA248](https://openairdocs.org/ntsb/CHI97FA248.md): Valley Adventurers Adventurer 333 · Fond Du Lac, WI · Accident · 1 fatal · Field investigation · Final report · Aug 5, 1997 · N323VA · Destroyed
  > The kit manufacturer's use of inadequate material in construction of the airplane, his inadequate application of quality controls resulting in the debonding of the horizontal stabilizer. Factors were the total loss of the horizontal stabilizer, the elevator,…
- [NTSB MIA97IA206](https://openairdocs.org/ntsb/MIA97IA206.md): McDonnell Douglas DC-8-61 · Miami, FL · Incident · No injuries · Incident investigation · Final report · Jul 5, 1997 · N27UA · Minor damage
  > failure of the right main landing gear cylinder due to stress corrosion.
- [NTSB SEA97LA157](https://openairdocs.org/ntsb/SEA97LA157.md): Cessna 172M · UT · Accident · No injuries · Limited investigation · Final report · Jul 1, 1997 · N4395R · Substantial damage
  > Undetermined.
- [NTSB MIA97LA202](https://openairdocs.org/ntsb/MIA97LA202.md): DFL Holdings Tango · Keystone, FL · Accident · 1 fatal · Limited investigation · Final report · Jul 1, 1997 · N772T · Destroyed
  > an in-flight loss of control for undetermined reasons.
- [NTSB ANC97FAMS1](https://openairdocs.org/ntsb/ANC97FAMS1.md): Cessna 182F · Talkeetna, AK · Accident · 4 fatal · Missing aircraft · Final report · Jun 29, 1997 · N3186U · Destroyed
  > Undetermined.
- [NTSB SEA97FA148](https://openairdocs.org/ntsb/SEA97FA148.md): Beech 77 · Cottage Grove, OR · Accident · 2 fatal · Field investigation · Final report · Jun 21, 1997 · N6630C · Substantial damage
  > Fuel exhaustion resulting from the pilot's inadequate preflight planning/preparation and his failure to maintain adequate airspeed during a forced landing approach, resulting in a stall. A related factor was the pilot's failure to refuel.
- [NTSB CHI97LA163](https://openairdocs.org/ntsb/CHI97LA163.md): Siefert 5151RG · Shelbyville, IN · Accident · 1 fatal · Limited investigation · Final report · Jun 10, 1997 · N81728 · Destroyed
  > the cause of the accident is undetermined.
- [NTSB CHI97FAMS2](https://openairdocs.org/ntsb/CHI97FAMS2.md): Beech 95-C55 · Grand Haven, MI · Accident · 2 fatal · Missing aircraft · Final report · Apr 21, 1997 · N242BS · Destroyed
  > undetermined.
- [NTSB MIA97LA125](https://openairdocs.org/ntsb/MIA97LA125.md): McDonnell Douglas DC10-30F · Memphis, TN · Accident · No injuries · Limited investigation · Final report · Apr 9, 1997 · N310FE · Substantial damage
  > A stall buffet or a high speed buffet event which occurred at an undetermined time.
- [NTSB LAX97FAMS2](https://openairdocs.org/ntsb/LAX97FAMS2.md): Piper PA-28-161 · Avalon, CA · Accident · 1 fatal · Missing aircraft · Final report · Feb 11, 1997 · N8436X · Destroyed
  > undetermined.
- [NTSB MIA97FA043](https://openairdocs.org/ntsb/MIA97FA043.md): Forney F-1 · Middleburg, FL · Accident · 1 fatal · Field investigation · Final report · Dec 22, 1996 · N7530C · Destroyed
  > VFR flight by the noninstrument-rated pilot into instrument meteorological conditions (IMC), which resulted in spatial disorientation and an uncontrolled descent into a wooded area. Factors relating to the accident were: failure of the pilot to obtain a…
- [NTSB FTW97LA047](https://openairdocs.org/ntsb/FTW97LA047.md): Cessna 182E · Alamosa, CO · Accident · No injuries · Limited investigation · Final report · Nov 12, 1996 · N3293Y · Substantial damage
  > aircraft damage for undetermined rteasons.
- [NTSB CHI97FA024](https://openairdocs.org/ntsb/CHI97FA024.md): Cessna 177B · Chancellor, SD · Accident · 1 fatal · Field investigation · Final report · Nov 5, 1996 · N34994 · Destroyed
  > the pilot's attempted flight with known deficiencies in equipment, his initiating VFR flight into IMC conditions, his spatial disorientation and loss of control of the airplane. Factors were fog, dark night, and inoperative directional gyro.
- [NTSB SEA97FA016](https://openairdocs.org/ntsb/SEA97FA016.md): Robinson R22 Beta · Halsey, OR · Accident · 1 fatal · Field investigation · Final report · Oct 19, 1996 · N512HH · Destroyed
  > The pilot-in-command's failure to maintain main rotor RPM, resulting in loss of control of the helicopter and collision with terrain. Factors included the pilot's lack of experience in helicopters, and interpersonal relationship problems between the pilot and…
- [NTSB LAX97LA013](https://openairdocs.org/ntsb/LAX97LA013.md): Piper PA-28-181 · San Diego, CA · Accident · Serious injuries · Limited investigation · Final report · Oct 12, 1996 · N2501X · Destroyed
  > the student pilot's impairment of judgment and performance due to alcohol, his subsequent flight into adverse weather conditions, and his failure to maintain clearance from obstructions (power lines). Factors related to the accident were: darkness, low…
- [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.

Next page: https://openairdocs.org/ntsb-phases/990/cases.md?page=21

## 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=20

---
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.