# 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 18 of 40 · 1,978 cases

## Cases, newest first

- [NTSB DFW07LA170](https://openairdocs.org/ntsb/DFW07LA170.md): Hazen Fly Baby · Page, OK · Accident · 1 fatal · Limited investigation · Final report · Jul 20, 2007 · N6156Y · Substantial damage
  > The airplane's collision with wooded and mountainous terrain for undetermined reasons.
- [NTSB LAX07FAMS1](https://openairdocs.org/ntsb/LAX07FAMS1.md): Cub Crafters CC11-100 · Aurora, OR · Accident · 1 fatal · Missing aircraft · Final report · Jul 7, 2007 · N222TB · Destroyed
  > The airplane is missing.
- [NTSB DFW07LA160](https://openairdocs.org/ntsb/DFW07LA160.md): Ingraham RV-6 · Carlsbad, NM · Accident · 1 fatal · Limited investigation · Final report · Feb 28, 2007 · N320TX · Destroyed
  > The pilot's loss of control for undetermined reasons.
- [NTSB SEA07LA050](https://openairdocs.org/ntsb/SEA07LA050.md): Piper PA-28R-180 · Fresno, CA · Accident · No injuries · Limited investigation · Final report · Dec 21, 2006 · N4666J · Substantial damage
  > The design stress limits of the airframe were exceeded by an unknown pilot.
- [NTSB LAX06LA293](https://openairdocs.org/ntsb/LAX06LA293.md): Champion 7EC · Clipper Mills, CA · Accident · 2 fatal · Limited investigation · Final report · Sep 10, 2006 · N9575S · Destroyed
  > The pilot failed to maintain clearance from mountainous terrain. A contributing factor was the pilot's impairment from ingestion of marijuana.
- [NTSB CHI06LA258](https://openairdocs.org/ntsb/CHI06LA258.md): Garner Garner Falcon · Newton, IA · Accident · 1 fatal · Limited investigation · Final report · Sep 9, 2006 · N6194Y · Destroyed
  > An inflight collision with terrain during an unknown phase of flight. A factor was the pilot's lack of experience.
- [NTSB ANC06FAMS1](https://openairdocs.org/ntsb/ANC06FAMS1.md): Aero Commander 690A · Anchorage, AK · Accident · 3 fatal · Missing aircraft · Final report · Jul 29, 2006 · N57096 · Destroyed
  > Undetermined; the airplane and its occupants are missing.
- [NTSB CHI06LA178](https://openairdocs.org/ntsb/CHI06LA178.md): Moon Rans S-14 · Berlin, IL · Accident · 1 fatal · Limited investigation · Final report · Jul 7, 2006 · N43293 · Destroyed
  > The pilot's failure to maintain control of the airplane for undetermined reasons.
- [NTSB DFW06CA175](https://openairdocs.org/ntsb/DFW06CA175.md): Cessna C340A · San Antonio, TX · Accident · No injuries · Data collection · Final report · Jul 5, 2006 · N2745F · Substantial damage
  > The collapse of the left main landing gear as result of the failure of the gear pivot bolt for undetermined reasons.
- [NTSB LAX06LA123](https://openairdocs.org/ntsb/LAX06LA123.md): Schweizer 269C-1 · Valencia, CA · Accident · 1 fatal · Limited investigation · Final report · Feb 25, 2006 · N61466 · Destroyed
  > The certified flight instructor's failure to maintain an adequate clearance from objects.
- [NTSB LAX06FA059](https://openairdocs.org/ntsb/LAX06FA059.md): Cessna 172S · Hana, HI · Accident · 1 fatal · Field investigation · Final report · Dec 16, 2005 · N542SP · Substantial damage
  > Collision with mountainous terrain for undetermined reasons.
- [NTSB LAX06CA039](https://openairdocs.org/ntsb/LAX06CA039.md): Cessna 182T · Livermore, CA · Accident · No injuries · Data collection · Final report · Oct 30, 2005 · N51732 · Substantial damage
  > substantial damage to the airplane during unknown phase of flight for undetermined reasons.
- [NTSB DFW06FAMS1](https://openairdocs.org/ntsb/DFW06FAMS1.md): Bell 206-L3 · Gulf of Mexico · Accident · 3 fatal · Missing aircraft · Final report · Oct 6, 2005 · N6560K · Destroyed
  > Undetermined. The aircraft is missing.
- [NTSB CHI05FA274](https://openairdocs.org/ntsb/CHI05FA274.md): Robinson R44 · Drummond, WI · Accident · 3 fatal · Field investigation · Final report · Sep 24, 2005 · N9158U · Substantial damage
  > Clearance not obtained/maintained by the pilot during an unknown phase of flight. Contributing factors were the improper use of procedures by the pilot, the inadequate surveillance of the operation by company/management, and the wire.
- [NTSB SEA05FA180](https://openairdocs.org/ntsb/SEA05FA180.md): Maule Bee Dee M-4 · Ritter, OR · Accident · 1 fatal · Field investigation · Final report · Aug 24, 2005 · N11WG · Destroyed
  > The loss of control for an undetermined reason which resulted in a ground collision.
- [NTSB ATL05LA140](https://openairdocs.org/ntsb/ATL05LA140.md): Allegro 2000 · Supply, NC · Accident · 2 fatal · Limited investigation · Final report · Aug 7, 2005 · N9164M · Substantial damage
  > The instructor pilot's failure to maintain airspeed for unknown reasons, resulting in an aerodynamic stall and subsequent collision with the ground.
- [NTSB SEA05IA115](https://openairdocs.org/ntsb/SEA05IA115.md): Piper PA-46-350P · Tacoma, WA · Incident · No injuries · Incident investigation · Final report · Jun 2, 2005 · N27PG · Minor damage
  > The initiation and propagation of a fatigue crack, over 5,273 hours of cyclic in-flight usage, through approximately 80 percent of the aircraft's right wing spar lower cap.
- [NTSB CHI05LA125](https://openairdocs.org/ntsb/CHI05LA125.md): Hurley Searey · South Beloit, IL · Accident · 1 fatal · Limited investigation · Final report · May 24, 2005 · N60667 · Destroyed
  > In-flight collision with the ground for undetermined reasons.
- [NTSB LAX05LA227](https://openairdocs.org/ntsb/LAX05LA227.md): Piper PA-28R-200 · Phoenix, AZ · Accident · No injuries · Limited investigation · Final report · Mar 11, 2005 · N2882R · Substantial damage
  > substantial damage to the airplane during an unknown phase of flight for undetermined reasons.
- [NTSB NYC05IA052](https://openairdocs.org/ntsb/NYC05IA052.md): Cessna 402C · Hyannis, MA · Incident · No injuries · Incident investigation · Final report · Feb 11, 2005 · N403BK · Minor damage
  > The mechanic's inadequate inspection, which failed to discover cracks in the left wing spar around wing station 114.
- [NTSB DFW05LA069](https://openairdocs.org/ntsb/DFW05LA069.md): Nolen Lite Squared · Holdenville, OK · Accident · 1 fatal · Limited investigation · Final report · Jan 14, 2005 · N222JN · Destroyed
  > Undetermined
- [NTSB ANC04FAMS2](https://openairdocs.org/ntsb/ANC04FAMS2.md): de Havilland DHC-2 · Sitka, AK · Accident · 5 fatal · Missing aircraft · Final report · Sep 20, 2004 · N712TS · Destroyed
  > Reason for occurrence is undetermined. The airplane is missing.
- [NTSB LAX04LA313](https://openairdocs.org/ntsb/LAX04LA313.md): Redgate Europa Classic · Marble Canyon, AZ · Accident · 2 fatal · Limited investigation · Final report · Sep 2, 2004 · N912EE · Destroyed
  > an in-flight collision with terrain for undetermined reasons.
- [NTSB SEA04LA162](https://openairdocs.org/ntsb/SEA04LA162.md): Universal Moulded Pdts. Monocoach · Pullman, WA · Accident · No injuries · Limited investigation · Final report · Aug 17, 2004 · N11872 · Substantial damage
  > The failure of a landing gear oleo retaining nut safety clip (snap ring) at an unknown point in time, leading to the partial separation of the landing gear strut while in flight, and the full collapse of the strut during the subsequent landing. Factors…
- [NTSB ATL04LA143](https://openairdocs.org/ntsb/ATL04LA143.md): Cessna 172S · Winder, GA · Accident · No injuries · Limited investigation · Final report · Jul 20, 2004 · N2069S · Substantial damage
  > The improper maintenance (over-pressurization) of the nose gear strut, which resulted in an overload failure of the nose gear upper torque link bolt. The airplane subsequently nosed over during an uncontrollable landing roll.
- [NTSB SEA04LA110](https://openairdocs.org/ntsb/SEA04LA110.md): Quicksilver MXL · Mountain Home, ID · Accident · 1 fatal · Limited investigation · Final report · Jun 18, 2004 · UNREG · Substantial damage
  > The pilot's failure to maintain aircraft control during an undetermined in-flight operational phase resulting in an uncontrolled descent into the terrain. Factors include strong gusty winds in the area of the accident.
- [NTSB FTW04LA085](https://openairdocs.org/ntsb/FTW04LA085.md): Cessna 172K · Angleton, TX · Accident · No injuries · Limited investigation · Final report · Feb 29, 2004 · N79502 · Destroyed
  > The unqualified person's failure to maintain clearance with the power lines. A contributing factor was the night light conditions.
- [NTSB SEA04LA027](https://openairdocs.org/ntsb/SEA04LA027.md): Erickson SHA Glasair TD · Vansycle, OR · Accident · 2 fatal · Limited investigation · Final report · Dec 15, 2003 · N434SW · Destroyed
  > The pilot's failure to maintain adequate clearance with the anemometer pole/wires during low altitude flight. Contributing factors were the pole and the pilot's low altitude flight.
- [NTSB MIA04FAMS1](https://openairdocs.org/ntsb/MIA04FAMS1.md): Piper PA-32-300 · Missing, Bahamas · Accident · 1 fatal · Missing aircraft · Final report · Nov 13, 2003 · N8224C · Destroyed
  > Undetermined.
- [NTSB DEN03FAMS1](https://openairdocs.org/ntsb/DEN03FAMS1.md): Beech F33A · Greer, AZ · Accident · 2 fatal · Missing aircraft · Final report · Sep 21, 2003 · N927JL · Destroyed
  > The airplane is missing for unknown reason.
- [NTSB CHI04LA134](https://openairdocs.org/ntsb/CHI04LA134.md): Robinson R22 Beta · Argusville, ND · Accident · No injuries · Limited investigation · Final report · Sep 5, 2003 · N2301F · Substantial damage
  > The altitude/clearance not maintained from transmission wire(s) by the pilot during an unknown phase of flight. The transmission wire(s) were a contributing factor.
- [NTSB ANC03FAMS1](https://openairdocs.org/ntsb/ANC03FAMS1.md): Alon A-2 (Aircoupe) · Ketchikan, AK · Accident · 2 fatal · Missing aircraft · Final report · Aug 17, 2003 · N6520Q · Destroyed
  > Undetermined..
- [NTSB CHI03LA269](https://openairdocs.org/ntsb/CHI03LA269.md): Holden Pulsar · Willmar, MN · Accident · 2 fatal · Limited investigation · Final report · Aug 16, 2003 · N78DT · Destroyed
  > The pilot's failure to maintain adequate airspeed resulting in an inadvertent stall/spin.
- [NTSB SEA03FA148](https://openairdocs.org/ntsb/SEA03FA148.md): Robinson R22 Beta · Tulalip, WA · Accident · 1 fatal · Field investigation · Final report · Jul 22, 2003 · N7190K · Destroyed
  > A loss of control for unknown reasons.
- [NTSB ANC03LA067](https://openairdocs.org/ntsb/ANC03LA067.md): Cessna 180 · Anchor Point, AK · Accident · 3 fatal · Limited investigation · Final report · Jun 25, 2003 · N91303 · Destroyed
  > An in-flight collision with water for an undetermined reason.
- [NTSB LAX03FAMS3](https://openairdocs.org/ntsb/LAX03FAMS3.md): Cessna 172B · Little River, CA · Accident · 1 fatal · Missing aircraft · Final report · May 26, 2003 · N7555X · Destroyed
  > Aircraft is missing.
- [NTSB FTW03LA094](https://openairdocs.org/ntsb/FTW03LA094.md): Cessna 210L · Morrilton, AR · Accident · No injuries · Limited investigation · Final report · Feb 4, 2003 · N22432 · Substantial damage
  > The failure of the main landing gear to extend and lock, as a result of a hydraulic fluid leak caused by a chaffed and ruptured flex line.
- [NTSB DEN03FA034](https://openairdocs.org/ntsb/DEN03FA034.md): Yakovlev YAK 52 · Midway, UT · Accident · 2 fatal · Field investigation · Final report · Jan 16, 2003 · N2256J · Destroyed
  > The malfunction of the elevator control as a result of a jammed elevator control bell crank, rendering control of the airplane impossible. A contributing factor was the foreign object (nut) damage.
- [NTSB CHI03LA236](https://openairdocs.org/ntsb/CHI03LA236.md): Polsgrove Bluegrass Express · Grafton, IL · Accident · 1 fatal · Limited investigation · Final report · Jan 9, 2003 · N113YE · Destroyed
  > Undetermined.
- [NTSB LAX03FAMS1](https://openairdocs.org/ntsb/LAX03FAMS1.md): Piper PA-34-200T · Pacific Ocean (Pacific Ocean) · Accident · 1 fatal · Missing aircraft · Final report · Dec 15, 2002 · N101YK · Destroyed
  > undetermined, missing aircraft.
- [NTSB ANC03LA022](https://openairdocs.org/ntsb/ANC03LA022.md): Cessna 180 · Petersburg, AK · Accident · 1 fatal · Limited investigation · Final report · Dec 13, 2002 · N9701G · Destroyed
  > An in flight collision with ocean water for an undetermined reason.
- [NTSB CHI03FAMS1](https://openairdocs.org/ntsb/CHI03FAMS1.md): Cessna 175 · MI · Accident · 2 fatal · Missing aircraft · Final report · Nov 11, 2002 · N7091M · Substantial damage
  > Undetermined. Missing aircraft.
- [NTSB MIA03LA012](https://openairdocs.org/ntsb/MIA03LA012.md): Piper PA-46-350P · Memphis, TN · Accident · 2 fatal · Limited investigation · Final report · Nov 3, 2002 · N167MA · Destroyed
  > The cause of the accident is unknown as the airplane has not been located. A finding in the investigation was the fact that the pilot conducted an unstabilized approach; the flight was right, left, then right of the final approach course during the approach…
- [NTSB MIA02FAMS3](https://openairdocs.org/ntsb/MIA02FAMS3.md): Piper PA-36-300 · Missing · Accident · 1 fatal · Missing aircraft · Final report · Sep 6, 2002 · N59684 · Destroyed
  > The falure of the pilot to arrive at the intended destination for undetermined reasons. A finding in the investigation was the fact that clouds with tops to 44,000 feet were noted 38 miles south of the airplane's last position.
- [NTSB ANC02FA070](https://openairdocs.org/ntsb/ANC02FA070.md): Zawada Super Cuby · Cantwell, AK · Accident · 2 fatal · Field investigation · Final report · Jul 4, 2002 · N43Z · Substantial damage
  > The pilot's failure to maintain adequate airspeed which resulted in an inadvertent stall, and subsequent collision with terrain. A contributing factor was the pilot's impairment from the effects of prescription painkilling drugs.
- [NTSB SEA02LA098](https://openairdocs.org/ntsb/SEA02LA098.md): Unknown Quicksilver MX II · Cook, WA · Accident · 1 fatal · Limited investigation · Final report · Jun 9, 2002 · UNREG · Substantial damage
  > Failure to maintain aircraft control. High winds were a factor.
- [NTSB CHI02FA140](https://openairdocs.org/ntsb/CHI02FA140.md): Schutte Ms. Ryan Special · Anderson, IN · Accident · 1 fatal · Field investigation · Final report · May 23, 2002 · N827CM · Destroyed
  > The pilot's failure to properly install the canard attach bolts prior to the flight and the resulting inflight separation of the canard.
- [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.…

Next page: https://openairdocs.org/ntsb-phases/990/cases.md?page=19

## 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=18

---
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.