# Air conditioning system - Type: NTSB finding section - Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft systems](https://openairdocs.org/ntsb-findings/0102) › Air conditioning system - NTSB code: 010221 - Cases: 14 - In the probable cause: 12 - Fatal cases: 6 - All cases: https://openairdocs.org/ntsb-findings/010221/cases.md - Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/010221/cases.md?cause=1 - Page: https://openairdocs.org/ntsb-findings/010221 ## Cases per year (in the probable cause / all) - 2008: 1 / 2 - 2012: 2 / 2 - 2014: 2 / 2 - 2015: 1 / 1 - 2016: 3 / 3 - 2019: 1 / 1 - 2020: 1 / 1 - 2021: 1 / 1 - 2023: 0 / 1 ## Findings - [Heating system](https://openairdocs.org/ntsb-findings/01022140): 5 cases, 5 in the probable cause - [Pressurization control system](https://openairdocs.org/ntsb-findings/01022130): 3 cases, 2 in the probable cause - [Air conditioning system, general](https://openairdocs.org/ntsb-findings/01022100): 2 cases, 1 in the probable cause - [Air distribution system](https://openairdocs.org/ntsb-findings/01022120): 2 cases, 2 in the probable cause - [Pressure sensor](https://openairdocs.org/ntsb-findings/01022134): 1 cases, 1 in the probable cause - [Cooling sys (air/vapor cycle)](https://openairdocs.org/ntsb-findings/01022150): 1 cases, 1 in the probable cause ## Defining events in these cases - [Pressure/environ sys malf/fail](https://openairdocs.org/ntsb-events/331): 4 cases - [Loss of control in flight](https://openairdocs.org/ntsb-events/240): 2 cases - [Fire/smoke (non-impact)](https://openairdocs.org/ntsb-events/150): 2 cases - [Birdstrike](https://openairdocs.org/ntsb-events/901): 1 cases - [Miscellaneous/other](https://openairdocs.org/ntsb-events/900): 1 cases - [Flight control sys malf/fail](https://openairdocs.org/ntsb-events/333): 1 cases - [Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330): 1 cases - [Cabin safety event](https://openairdocs.org/ntsb-events/110): 1 cases - [Hard landing](https://openairdocs.org/ntsb-events/092): 1 cases ## Aircraft models (registry) - [Socata TBM 700](https://openairdocs.org/model/socata-tbm-700): 1 cases - [Gulfstream Aerospace G-IV](https://openairdocs.org/model/gulfstream-aerospace-g-iv): 1 cases - [Cessna 501](https://openairdocs.org/model/cessna-501): 1 cases - [Cessna 340](https://openairdocs.org/model/cessna-340): 1 cases - [Cessna 401](https://openairdocs.org/model/cessna-401): 1 cases - [Cessna 310Q](https://openairdocs.org/model/cessna-310q): 1 cases - [Cessna 208B](https://openairdocs.org/model/cessna-208b): 1 cases - [Cessna 210](https://openairdocs.org/model/cessna-210): 1 cases - [Cessna 172S](https://openairdocs.org/model/cessna-172s): 1 cases - [Bombardier CL-600-2C10](https://openairdocs.org/model/bombardier-cl-600-2c10): 1 cases ## Other findings in the same cases - [Adequacy of policy/proc](https://openairdocs.org/ntsb-findings/04021015) (Organizational issues): 3 cases - [Decision making/judgment](https://openairdocs.org/ntsb-findings/02041520) (Personnel issues): 2 cases - [Hypoxia/anoxia](https://openairdocs.org/ntsb-findings/02012035) (Personnel issues): 2 cases - [Fuel](https://openairdocs.org/ntsb-findings/01071010) (Aircraft): 2 cases - [Performance/control parameters, general](https://openairdocs.org/ntsb-findings/01062000) (Aircraft): 2 cases - [Not determined, general](https://openairdocs.org/ntsb-findings/05000000) (Not determined): 1 cases - [Manufacture/production, general](https://openairdocs.org/ntsb-findings/04013000) (Organizational issues): 1 cases - [Air quality/dust/smoke](https://openairdocs.org/ntsb-findings/03041025) (Environmental issues): 1 cases - [Freezing rain/sleet](https://openairdocs.org/ntsb-findings/03035040) (Environmental issues): 1 cases - [Animal(s)/bird(s)](https://openairdocs.org/ntsb-findings/03022045) (Environmental issues): 1 cases ## Newest cases - [NTSB DCA24LA330](https://openairdocs.org/ntsb/DCA24LA330), Dec 20, 2023: Boeing 737-8 (N8830Q), Kenner, LA, incident, minor damage. Probable cause: A partial loss of engine power due to bird ingestion in the No. 1 (left) engine, which resulted in the activation of the load reduction device to prevent vibration. The load reduction device… - [NTSB CEN21LA268](https://openairdocs.org/ntsb/CEN21LA268), Jun 10, 2021: Cessna 172S (N365CP), Saint James, LA, substantial damage. Probable cause: The in-flight fatigue failure of an air-conditioning system hose which resulted in a precautionary landing and impact with a road sign. - [NTSB CEN21LA030](https://openairdocs.org/ntsb/CEN21LA030), Oct 26, 2020: Cessna 210 (N9622T), Lubbock, TX, destroyed, 1 fatal. Probable cause: The pilot’s improper decision to fly into icing conditions with an airplane that was not equipped for icing, which led to structural icing and a subsequent loss of airplane control, and the pilot’s… - [NTSB ERA19TA211](https://openairdocs.org/ntsb/ERA19TA211), Jun 29, 2019: Cessna 208 (N80JF), Plant City, FL, substantial damage. Probable cause: The pilot's improper landing flare due to reduced visibility from a foggy windshield and his failure to use the airplane’s windshield defrost system, which resulted in a hard landing and subsequent… - [NTSB CEN17FA045](https://openairdocs.org/ntsb/CEN17FA045), Dec 1, 2016: Cessna 340 (N123KK), Fargo, ND, destroyed, 1 fatal. Probable cause: The loose fuel fitting on the combustion heater that leaked a lean fuel-air mixture into the nose baggage compartment. The mixture was most likely ignited by the combustion heater, blowing off the… - [NTSB CEN16CA359](https://openairdocs.org/ntsb/CEN16CA359), Aug 26, 2016: Beech 58 (N15MD), Wichita Falls, TX, substantial damage. Probable cause: The incorrect maintenance of the airplane's ventilation system which resulted in an obstruction of the elevator control system. - [NTSB CEN16LA197](https://openairdocs.org/ntsb/CEN16LA197), May 24, 2016: Cessna 501 (N804ST), Texarkana, AR, substantial damage. Probable cause: 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… - [NTSB ERA15LA328](https://openairdocs.org/ntsb/ERA15LA328), Apr 10, 2015: Gulfstream Aerospace G IV (N450KK), Caribbean Sea, A1, substantial damage. Probable cause: 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… - [NTSB ERA14LA424](https://openairdocs.org/ntsb/ERA14LA424), Sep 5, 2014: Socata TBM 700 (N900KN), Caribbean Sea, A1, destroyed, 2 fatal. Probable cause: 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… - [NTSB CEN14LA159](https://openairdocs.org/ntsb/CEN14LA159), Mar 8, 2014: Cessna 310Q (N69980), Wapakoneta, OH, substantial damage. Probable cause: A fire due to a fuel leak of the cabin heater system. Contributing to the accident was the inadequate maintenance of the airplane, which failed to identify leaks in the heater system. NTSB has coded findings and defining events since 2008; earlier cases used its older occurrence and cause codes and aren't counted. Findings: https://openairdocs.org/ntsb-findings.md. Defining events: https://openairdocs.org/ntsb-events.md. Phases of flight: https://openairdocs.org/ntsb-phases.md. Every investigation, filtered by finding, event, phase, state, year or model: https://openairdocs.org/ntsb.md (for example ?state=MI&fatal=1). NTSB's definitions: Accident and incident, 49 CFR 830.2 (https://www.ecfr.gov/current/title-49/subtitle-B/chapter-VIII/part-830/subpart-A/section-830.2), CICTT occurrence categories (PDF) (https://www.ntsb.gov/safety/data/Documents/datafiles/OccurrenceCategoryDefinitions.pdf), CICTT phases of flight (PDF) (https://www.ntsb.gov/safety/data/Documents/datafiles/PhaseofFlightDefinitions.pdf), and NTSB coding manual, before 2008 (PDF) (https://www.ntsb.gov/GILS/Documents/codman.pdf). NTSB publishes no definitions for its findings, only their names. --- 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.