# Final NTSB investigations: Pressure/environ sys malf/fail

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 CEN21LA268](https://openairdocs.org/ntsb/CEN21LA268.md): Cessna 172S · Saint James, LA · Accident · No injuries · Class 4 · Limited · Final report · Jun 10, 2021 · N365CP · Substantial damage
  > The in-flight fatigue failure of an air-conditioning system hose which resulted in a precautionary landing and impact with a road sign.
- [NTSB WPR18LA269](https://openairdocs.org/ntsb/WPR18LA269.md): Robinson R44 · Wahiawa, HI · Accident · No injuries · Class 3 · Limited · Final report · Sep 18, 2018 · N632NV · Substantial damage
  > Loss of oil in flight as a result of a loose oil filter adapter which resulted in the pilot initiating an immediate landing to an open field. Contributing to the accident was the pilot's manipulation of the throttle that led to a reduction in rotor rpm, which…
- [NTSB DCA16FA217](https://openairdocs.org/ntsb/DCA16FA217.md): Boeing 737-700 · Pensacola, FL · Accident · No injuries · Field investigation · Final report · Aug 27, 2016 · N766SW · Substantial damage
  > A low-cycle fatigue crack in the dovetail of fan blade No. 23, which resulted in the fan blade separating in flight and impacting the fan case. This impact caused the fan blade to fracture into fragments that traveled farther than expected into the inlet,…
- [NTSB CEN16LA197](https://openairdocs.org/ntsb/CEN16LA197.md): Cessna 501 · Texarkana, AR · Accident · Minor injuries · Limited investigation · Final report · May 24, 2016 · N804ST · Substantial damage
  > The pilot's failure to use supplemental oxygen as required during high-altitude flight, which resulted in his loss of consciousness following a loss of cabin pressurization. Contributing to the accident was the separation of the air conditioning system's…
- [NTSB ERA15LA328](https://openairdocs.org/ntsb/ERA15LA328.md): Gulfstream Aerospace G IV · Caribbean Sea, A1 · Accident · No injuries · Limited investigation · Final report · Apr 10, 2015 · N450KK · Substantial damage
  > The in-flight failure of the cabin pressurization relief/safety valve (CPRV) due to an obstruction of the CPRV static port, which allowed the airplane to overpressurize. The reason for the initial overpressurization condition could not be determined.
- [NTSB DCA15LA011](https://openairdocs.org/ntsb/DCA15LA011.md): Boeing 737 330 · Lanai, HI · Accident · No injuries · Limited investigation · Final report · Oct 17, 2014 · N301KH · Substantial damage
  > the improper loading and securing of the cargo pallets, which shifted on departure, resulting in substantial damage to the aft pressure bulkhead.
- [NTSB ERA14LA424](https://openairdocs.org/ntsb/ERA14LA424.md): Socata TBM 700 · Caribbean Sea, A1 · Accident · 2 fatal · Limited investigation · Final report · Sep 5, 2014 · N900KN · Destroyed
  > The design of the cabin pressurization system, which made it prone to unnecessary shutdown, combined with a checklist design that prioritized troubleshooting over ensuring that the pilot was sufficiently protected from hypoxia. This resulted in a loss of…
- [NTSB ERA09FA429](https://openairdocs.org/ntsb/ERA09FA429.md): Cirrus SR-22 · Ravenswood, WV · Accident · 1 fatal · Field investigation · Final report · Jul 31, 2009 · N581DS · Destroyed
  > The pilot's improper modification of the certified, on-board oxygen system, which resulted in incapacitation due to hypoxia, and the airplane's subsequent uncontrolled descent into terrain.
- [NTSB CEN09FA087](https://openairdocs.org/ntsb/CEN09FA087.md): Beech C90 · Rocksprings, TX · Accident · 1 fatal · Field investigation · Final report · Dec 14, 2008 · N43KM · Substantial damage
  > The pilot's failure to properly configure the pressurization controls, resulting in his impairment and subsequent incapacitation due to hypoxia.

## The whole list in SQL

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

```sql
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."completionStatus" = 'Completed'
  AND c."mKey" IN (SELECT s.case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' s WHERE s."tier2Number" = '331' AND s.case_mkey IN (SELECT case_mkey FROM 'https://openairdocs.org/data/latest/ntsb_events.parquet' WHERE "isDefiningEvent"))
ORDER BY c."eventDate" DESC, c."ntsbNumber" DESC
```

This list as a web page: https://openairdocs.org/ntsb-events/331/sequence?status=final

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