# NTSB investigations, WI: Uncontrolled descent

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.

## Latest cases

- [NTSB CHI98LA339](https://openairdocs.org/ntsb/CHI98LA339.md): Enstrom 480 · Green Bay, WI · Accident · No injuries · Limited investigation · Final report · Sep 16, 1998 · N142CC · Substantial damage
  > the pilot's failure to maintain adequate rotor rpm during a practice autorotation.
- [NTSB CHI86LA097](https://openairdocs.org/ntsb/CHI86LA097.md): Cessna 172M · Milwaukee, WI · Accident · Serious injuries · Limited investigation · Final report · Mar 1, 1986 · N80167 · Destroyed
  > The aircraft was approximately 180 lbs over max recommended takeoff gross weight and used almost all of a 3560 foot runway to take off. The pilot stated that after liftoff the aircraft would not turn left and began to turn right on its own. He climbed to…
- [NTSB CHI81FA034](https://openairdocs.org/ntsb/CHI81FA034.md): Cessna 172 · Lake Geneva, WI · Accident · 2 fatal · Closed · Mar 10, 1981 · N733XU · Destroyed
- [NTSB CHI81FA026](https://openairdocs.org/ntsb/CHI81FA026.md): Piper PA-28 · Waupun, WI · Accident · 3 fatal · Closed · Feb 18, 1981 · N8422C · Destroyed
- [NTSB CHI81FA014](https://openairdocs.org/ntsb/CHI81FA014.md): Beech G35 · Harding, WI · Accident · 2 fatal · Closed · Dec 30, 1980 · N190B · Destroyed
- [NTSB CHI80FA006](https://openairdocs.org/ntsb/CHI80FA006.md): Cessna 172 · Fall Creek, WI · Accident · 2 fatal · Closed · Oct 20, 1979 · N5072R · Destroyed
- [NTSB CHI79FA081](https://openairdocs.org/ntsb/CHI79FA081.md): Cessna 150 · Porcupine, WI · Accident · 2 fatal · Closed · Sep 23, 1979 · N7853E · Destroyed
- [NTSB CHI79FA006](https://openairdocs.org/ntsb/CHI79FA006.md): Piper PA-24 · Baraboo, WI · Accident · 2 fatal · Closed · Oct 10, 1978 · N5696P · Destroyed
- [NTSB CHI77FA049](https://openairdocs.org/ntsb/CHI77FA049.md): Piper PA-24 · Grafton, WI · Accident · 4 fatal · Closed · Jun 11, 1977 · N6349P · Destroyed
- [NTSB CHI77FA026](https://openairdocs.org/ntsb/CHI77FA026.md): Beech 58 · Necedah, WI · Accident · 1 fatal · Closed · Feb 3, 1977 · N177HC · Destroyed
- [NTSB CHI76FA003](https://openairdocs.org/ntsb/CHI76FA003.md): Cessna 150M · Amherst, WI · Accident · 1 fatal · Closed · Oct 20, 1976 · N704PN · Destroyed
- [NTSB CHI76AC086](https://openairdocs.org/ntsb/CHI76AC086.md): Cessna 207 · East Troy, WI · Accident · 2 fatal · Closed · Aug 17, 1976 · N91061 · Destroyed
- [NTSB CHI75AC069](https://openairdocs.org/ntsb/CHI75AC069.md): Beech A24R · Beaver, WI · Accident · 3 fatal · Closed · Mar 21, 1975 · N9707Q · Destroyed
- [NTSB CHI74DEP37](https://openairdocs.org/ntsb/CHI74DEP37.md): Piper PA-28 · Lacrosse, WI · Accident · No injuries · Closed · Mar 23, 1974 · N15255 · Substantial damage
- [NTSB CHI74AC025](https://openairdocs.org/ntsb/CHI74AC025.md): Cessna 411 · Delavan, WI · Accident · 4 fatal · Closed · Sep 21, 1973 · N3243R · Destroyed
- [NTSB CHI73DEP27](https://openairdocs.org/ntsb/CHI73DEP27.md): Grumman G-164 · Antigo, WI · Accident · No injuries · Closed · Sep 11, 1972 · N73W · Substantial damage
- [NTSB CHI72ACO96](https://openairdocs.org/ntsb/CHI72ACO96.md): Cessna 207 · Cochrane, WI · Accident · 1 fatal · Closed · Jun 2, 1972 · N91005 · Destroyed
- [NTSB CHI72FEP35](https://openairdocs.org/ntsb/CHI72FEP35.md): Mustang M-1 · Appleton, WI · Accident · Serious injuries · Closed · Mar 26, 1972 · N5RK · Destroyed
- [NTSB CHI72AC031](https://openairdocs.org/ntsb/CHI72AC031.md): Cessna 150F · Tomahawk, WI · Accident · 2 fatal · Closed · Oct 1, 1971 · N7801F · Destroyed
- [NTSB CHI71AC034](https://openairdocs.org/ntsb/CHI71AC034.md): Piper PA-24 · Weston, WI · Accident · 4 fatal · Closed · Nov 18, 1970 · N7880P · Destroyed
- [NTSB CHI71AC026](https://openairdocs.org/ntsb/CHI71AC026.md): Cessna 310D · Watertown, WI · Accident · 3 fatal · Closed · Oct 20, 1970 · N6765T · Destroyed
- [NTSB CHI71AC018](https://openairdocs.org/ntsb/CHI71AC018.md): Beech J35 · Plain, WI · Accident · 4 fatal · Closed · Sep 6, 1970 · N622T · Destroyed
- [NTSB CHI70AC082](https://openairdocs.org/ntsb/CHI70AC082.md): Navion A · Evansville, WI · Accident · 3 fatal · Closed · May 23, 1970 · N5105K · Destroyed
- [NTSB CHI70AC075](https://openairdocs.org/ntsb/CHI70AC075.md): Cessna 150J · Fond Du Lac, WI · Accident · 2 fatal · Closed · Apr 28, 1970 · N5539G · Destroyed
- [NTSB CHI70FDJ06](https://openairdocs.org/ntsb/CHI70FDJ06.md): Bell 47G-2 · Oshkosh, WI · Accident · Minor injuries · Closed · Feb 1, 1970 · N5158B · Substantial damage
- [NTSB CHI68A0107](https://openairdocs.org/ntsb/CHI68A0107.md): Bell 47J-2 · Rice Lake, WI · Accident · 1 fatal · Closed · Jun 14, 1968 · N73258 · Destroyed
- [NTSB CHI68A0049](https://openairdocs.org/ntsb/CHI68A0049.md): Mooney M20C · Cable, WI · Accident · 3 fatal · Closed · Nov 23, 1967 · N1383W · Destroyed
- [NTSB CHI67A0067](https://openairdocs.org/ntsb/CHI67A0067.md): Piper PA-28 · Madison, WI · Accident · 4 fatal · Closed · Nov 22, 1966 · N7901W · Destroyed
- [NTSB CHI66F0521](https://openairdocs.org/ntsb/CHI66F0521.md): Cessna 172D · Walworth, WI · Accident · Serious injuries · Closed · Dec 10, 1965 · N2085Y · Destroyed
- [NTSB CHI66A0038](https://openairdocs.org/ntsb/CHI66A0038.md): Cessna 310F · Minocqua, WI · Accident · 2 fatal · Closed · Oct 17, 1965 · N188RT · Destroyed
- [NTSB CHI66A0028](https://openairdocs.org/ntsb/CHI66A0028.md): Aeronca 7AC · Whitewater, WI · Accident · 1 fatal · Closed · Sep 17, 1965 · N2334E · Destroyed
- [NTSB CHI66A0019](https://openairdocs.org/ntsb/CHI66A0019.md): Mooney M-20C · Beloit, WI · Accident · 1 fatal · Closed · Aug 20, 1965 · N6701U · Destroyed
- [NTSB CHI66A0009](https://openairdocs.org/ntsb/CHI66A0009.md): Cessna 150C · Wausau, WI · Accident · 1 fatal · Closed · Jul 18, 1965 · N7936Z · Destroyed
- [NTSB CHI66A0002](https://openairdocs.org/ntsb/CHI66A0002.md): Piper PA-16 · Lake Delton, WI · Accident · 1 fatal · Closed · Jul 4, 1965 · N6866K · Destroyed
- [NTSB CHI65A0090](https://openairdocs.org/ntsb/CHI65A0090.md): Aeronca 7AC · East Troy, WI · Accident · 2 fatal · Closed · Apr 10, 1965 · N84981 · Destroyed

## 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."eventStateOrRegion" = 'WI' AND c."eventCountry" = 'USA'
  AND c."mKey" IN (SELECT case_mkey FROM case_phases WHERE main = 650)
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-phases/650/cases?state=WI

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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.