# Flight instrument malf/fail - Type: NTSB defining event - NTSB code: 334 - CICTT category: System/Component Failure (Non-Powerplant) - Defining event in: 31 cases - In the sequence of: 56 cases - Fatal cases: 1 - All cases: https://openairdocs.org/ntsb-events/334/cases.md - Cases with it anywhere in the sequence: https://openairdocs.org/ntsb-events/334/sequence.md - Page: https://openairdocs.org/ntsb-events/334 ## Cases per year (defining / in the sequence) - 2008: 0 / 2 - 2009: 4 / 8 - 2010: 1 / 2 - 2011: 0 / 1 - 2012: 1 / 2 - 2013: 0 / 1 - 2014: 1 / 5 - 2015: 1 / 2 - 2016: 1 / 1 - 2017: 1 / 3 - 2018: 4 / 6 - 2019: 2 / 4 - 2020: 3 / 3 - 2021: 3 / 3 - 2022: 3 / 4 - 2023: 1 / 3 - 2024: 2 / 2 - 2025: 3 / 4 ## Phase of flight - Enroute: 6 cases - Initial climb: 6 cases - Takeoff: 6 cases - Enroute-cruise: 5 cases - Takeoff-rejected takeoff: 4 cases - Unknown: 1 cases - Landing-flare/touchdown: 1 cases - Maneuvering-low-alt flying: 1 cases - Enroute-descent: 1 cases ## In the probable cause of these cases - [Pitot/static anti-ice](https://openairdocs.org/ntsb-findings/01023030) (Aircraft): 3 cases - [Aircraft control](https://openairdocs.org/ntsb-findings/02063040) (Personnel issues): 2 cases - [Preflight inspection](https://openairdocs.org/ntsb-findings/02061510) (Personnel issues): 2 cases - [Airspeed](https://openairdocs.org/ntsb-findings/01062010) (Aircraft): 2 cases - [Pitot/static system](https://openairdocs.org/ntsb-findings/01023411) (Aircraft): 2 cases - [Use of policy/procedure](https://openairdocs.org/ntsb-findings/02063032) (Personnel issues): 1 cases - [Decision making/judgment](https://openairdocs.org/ntsb-findings/02041520) (Personnel issues): 1 cases - [Identification/recognition](https://openairdocs.org/ntsb-findings/02041510) (Personnel issues): 1 cases - [Info processing/decision, general](https://openairdocs.org/ntsb-findings/02041500) (Personnel issues): 1 cases - [Unnecessary action](https://openairdocs.org/ntsb-findings/02041045) (Personnel issues): 1 cases ## Aircraft models (registry) - [Piper PA-24-250](https://openairdocs.org/model/piper-pa-24-250): 1 cases - [Pilatus PC-12/47E](https://openairdocs.org/model/pilatus-pc-12-47e): 1 cases - [Mooney M20E](https://openairdocs.org/model/mooney-m20e): 1 cases - [Airbus A330-323](https://openairdocs.org/model/airbus-a330-323): 1 cases - [Cirrus Design SR22](https://openairdocs.org/model/cirrus-design-sr22): 1 cases - [Cessna 182L](https://openairdocs.org/model/cessna-182l): 1 cases - [Cessna 182A](https://openairdocs.org/model/cessna-182a): 1 cases - [Boeing 787-8](https://openairdocs.org/model/boeing-787-8): 1 cases - [Beech V35](https://openairdocs.org/model/beech-v35): 1 cases - [Beech S35](https://openairdocs.org/model/beech-s35): 1 cases ## Newest cases - [NTSB WPR25LA226](https://openairdocs.org/ntsb/WPR25LA226), Jul 27, 2025: Cessna 182L (N42725), Tucson Estates, AZ, destroyed. Probable cause: The pilot’s inability to stop the airplane on the runway during a rejected takeoff for undetermined reasons, which resulted in the airplane’s impact with a ditch. - [NTSB ENG25WA042](https://openairdocs.org/ntsb/ENG25WA042), Jun 4, 2025: Airbus A320 (4R-ABM), Katunayake, Sri Lanka, incident, no damage - [NTSB ENG26WA015](https://openairdocs.org/ntsb/ENG26WA015), Jan 9, 2025: Cessna 525 (PR-GFS), Ubatuba, Brazil - [NTSB ENG25WA008](https://openairdocs.org/ntsb/ENG25WA008), Nov 3, 2024: Pilatus PC12 (9H-EHA), Geneva, Switzerland, incident, no damage - [NTSB ENG24WA021](https://openairdocs.org/ntsb/ENG24WA021), Jan 25, 2024: Beech C90 (VH-JEO), Kalgoorlie, Australia, incident, no damage - [NTSB DCA23WA373](https://openairdocs.org/ntsb/DCA23WA373), May 22, 2023: Embraer ERJ190 (YV-2953), Vargas, Venezuela, incident, no damage - [NTSB DCA23WA187](https://openairdocs.org/ntsb/DCA23WA187), Jun 10, 2022: Boeing 737 (ZK-TLJ), Perth, Australia, incident, no damage - [NTSB DCA22WA117](https://openairdocs.org/ntsb/DCA22WA117), Apr 3, 2022: Boeing 737 (9MMLS), Kuala Lumpur, Malaysia, incident, no damage - [NTSB DCA22WA071](https://openairdocs.org/ntsb/DCA22WA071), Jan 15, 2022: Boeing 737 (YV2794), Barcelona, Venezuela, incident, no damage - [NTSB DCA21WA220](https://openairdocs.org/ntsb/DCA21WA220), Aug 30, 2021: Embraer ERJ190 (YV2944), Marquetia, Venezuela, incident, no damage 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.