# Circadian rhythms or jetlag - Type: NTSB finding subsection - Path: [Personnel issues](https://openairdocs.org/ntsb-findings/02) › [Physical](https://openairdocs.org/ntsb-findings/0201) › [Alertness/Fatigue](https://openairdocs.org/ntsb-findings/020135) › Circadian rhythms or jetlag - NTSB code: 02013515 - Cases: 9 - In the probable cause: 7 - Fatal cases: 7 - All cases: https://openairdocs.org/ntsb-findings/02013515/cases.md - Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/02013515/cases.md?cause=1 - Page: https://openairdocs.org/ntsb-findings/02013515 ## Cases per year (in the probable cause / all) - 2009: 2 / 2 - 2012: 1 / 1 - 2013: 1 / 1 - 2015: 1 / 1 - 2017: 1 / 1 - 2019: 0 / 1 - 2021: 1 / 1 - 2023: 0 / 1 ## Defining events in these cases - [Controlled flight into terr/obj (CFIT)](https://openairdocs.org/ntsb-events/120): 4 cases - [Loss of control in flight](https://openairdocs.org/ntsb-events/240): 2 cases - [Wrong surface or wrong airport](https://openairdocs.org/ntsb-events/284): 1 cases - [Altitude deviation](https://openairdocs.org/ntsb-events/282): 1 cases - [Aerodynamic stall/spin](https://openairdocs.org/ntsb-events/241): 1 cases ## Aircraft models (registry) - [Aerospatiale/Aeritalia ATR 42-320](https://openairdocs.org/model/aerospatiale-aeritalia-atr-42-320): 1 cases - [Piper PA-28-140](https://openairdocs.org/model/piper-pa-28-140): 1 cases - [Diamond Aircraft Ind DA 40](https://openairdocs.org/model/diamond-aircraft-ind-da-40): 1 cases - [Convair 440](https://openairdocs.org/model/convair-440): 1 cases - [Cessna 550](https://openairdocs.org/model/cessna-550): 1 cases - [Cessna 414A](https://openairdocs.org/model/cessna-414a): 1 cases - [Cessna 172S](https://openairdocs.org/model/cessna-172s): 1 cases ## Other findings in the same cases - [Incorrect action performance](https://openairdocs.org/ntsb-findings/02041015) (Personnel issues): 4 cases - [Lack of sleep](https://openairdocs.org/ntsb-findings/02013510) (Personnel issues): 4 cases - [Aircraft control](https://openairdocs.org/ntsb-findings/02063040) (Personnel issues): 3 cases - [Adequacy of policy/proc](https://openairdocs.org/ntsb-findings/04021015) (Organizational issues): 2 cases - [Dark](https://openairdocs.org/ntsb-findings/03036020) (Environmental issues): 2 cases - [CRM/MRM techniques](https://openairdocs.org/ntsb-findings/02063540) (Personnel issues): 2 cases - [Use of available resources](https://openairdocs.org/ntsb-findings/02063035) (Personnel issues): 2 cases - [Decision making/judgment](https://openairdocs.org/ntsb-findings/02041520) (Personnel issues): 2 cases - [Situational awareness](https://openairdocs.org/ntsb-findings/02022035) (Personnel issues): 2 cases - [Angle of attack](https://openairdocs.org/ntsb-findings/01062042) (Aircraft): 2 cases ## Newest cases - [NTSB WPR23FA257](https://openairdocs.org/ntsb/WPR23FA257), Jul 8, 2023: Cessna 550 (N819KR), Murrieta, CA, destroyed, 6 fatal. Probable cause: The flight crew’s decision to descend below the decision altitude of an instrument approach without having the appropriate runway visual reference(s) distinctively identified and with the visibility… - [NTSB WPR21FA231](https://openairdocs.org/ntsb/WPR21FA231), Jun 18, 2021: Piper PA-28-140 (N6323R), Rush Valley, UT, substantial damage, 2 fatal. Probable cause: The pilot’s misidentification of a mountain pass at night, which resulted in controlled flight into terrain. Contributing to the accident were the pilot’s overconfidence based on her previous… - [NTSB CEN19MA312](https://openairdocs.org/ntsb/CEN19MA312), Sep 11, 2019: Convair 440 (N24DR), Monclova, OH, destroyed, 2 fatal. Probable cause: The flight crew’s failure to maintain the proper airspeed on final approach, which resulted in an inadvertent aerodynamic stall and impact with trees, and terrain. Contributing to the accident was… - [NTSB DCA17IA148](https://openairdocs.org/ntsb/DCA17IA148), Jul 8, 2017: Airbus A320-211 (C-FKCK), San Francisco, CA, incident, no damage. Probable cause: The flight crew's misidentification of taxiway C as the intended landing runway, which resulted from the crewmembers' lack of awareness of the parallel runway closure due to their ineffective review… - [NTSB CEN15FA190](https://openairdocs.org/ntsb/CEN15FA190), Apr 7, 2015: Cessna 414A (N789UP), Bloomington, IL, substantial damage, 7 fatal. Probable cause: The pilot's failure to maintain control of the airplane during the instrument approach in night instrument meteorological conditions, which resulted in the airplane exceeding its critical angle of… - [NTSB DCA13MA120](https://openairdocs.org/ntsb/DCA13MA120), Jul 6, 2013: Boeing 777-200ER (HL7742), San Francisco, CA, destroyed, 3 fatal. Probable cause: The flight crew's mismanagement of the airplane's descent during the visual approach, the pilot flying's unintended deactivation of automatic airspeed control, the flight crew's inadequate monitoring… - [NTSB ERA12FA572](https://openairdocs.org/ntsb/ERA12FA572), Sep 22, 2012: Cessna 172S (N21750), Land O'Lakes, FL, substantial damage, 1 fatal. Probable cause: The pilot’s decision to continue the cross-country flight while fatigued, which resulted in him falling asleep during the initial descent for landing. - [NTSB WPR09FA146](https://openairdocs.org/ntsb/WPR09FA146), Mar 2, 2009: Diamond Aircraft Ind DA-40 (N521DS), Arcata, CA, destroyed, 2 fatal. Probable cause: The pilot's failure to maintain proper altitude and glidepath while executing a night instrument approach. Contributing to the accident was the pilot's fatigue. - [NTSB CEN09MA142](https://openairdocs.org/ntsb/CEN09MA142), Jan 27, 2009: Aerospatiale Alenia ATR 42-320 (N902FX), Lubbock, TX, substantial damage. Probable cause: The flight crew's failure to monitor and maintain a minimum safe airspeed while executing an instrument approach in icing conditions, which resulted in an aerodynamic stall at low altitude.… 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.