# Horizontal stabilizer - Type: NTSB finding subsection - Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft structures](https://openairdocs.org/ntsb-findings/0103) › [Empennage structure](https://openairdocs.org/ntsb-findings/010355) › Horizontal stabilizer - NTSB code: 01035510 - Cases: 23 - In the probable cause: 17 - Fatal cases: 6 - All cases: https://openairdocs.org/ntsb-findings/01035510/cases.md - Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01035510/cases.md?cause=1 - Page: https://openairdocs.org/ntsb-findings/01035510 ## Cases per year (in the probable cause / all) - 2008: 2 / 4 - 2011: 2 / 2 - 2013: 0 / 1 - 2015: 1 / 2 - 2017: 1 / 1 - 2018: 1 / 1 - 2019: 3 / 3 - 2020: 1 / 2 - 2021: 1 / 1 - 2022: 1 / 1 - 2024: 4 / 5 ## Defining events in these cases - [Aircraft structural failure](https://openairdocs.org/ntsb-events/337): 6 cases - [Flight control sys malf/fail](https://openairdocs.org/ntsb-events/333): 5 cases - [Loss of control in flight](https://openairdocs.org/ntsb-events/240): 3 cases - [Birdstrike](https://openairdocs.org/ntsb-events/901): 2 cases - [Miscellaneous/other](https://openairdocs.org/ntsb-events/900): 1 cases - [External load event (Rotorcraft)](https://openairdocs.org/ntsb-events/480): 1 cases - [Part(s) separation from AC](https://openairdocs.org/ntsb-events/338): 1 cases - [Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330): 1 cases - [Midair collision](https://openairdocs.org/ntsb-events/250): 1 cases - [Ground collision](https://openairdocs.org/ntsb-events/200): 1 cases ## Aircraft models (registry) - [Eurocopter AS 350 B2](https://openairdocs.org/model/eurocopter-as-350-b2): 1 cases - [Piper PA 46-350P](https://openairdocs.org/model/piper-pa-46-350p): 1 cases - [Piper PA-28-161](https://openairdocs.org/model/piper-pa-28-161): 1 cases - [Piper PA-24-260](https://openairdocs.org/model/piper-pa-24-260): 1 cases - [Piper PA-23-250](https://openairdocs.org/model/piper-pa-23-250): 1 cases - [Piper PA-18A 150](https://openairdocs.org/model/piper-pa-18a-150): 1 cases - [Hughes Helicopters HUGHES 369D](https://openairdocs.org/model/hughes-helicopters-hughes-369d): 1 cases - [Great Lakes 2T-1A-2](https://openairdocs.org/model/great-lakes-2t-1a-2): 1 cases - [Cessna U206C](https://openairdocs.org/model/cessna-u206c): 1 cases - [Cessna 180](https://openairdocs.org/model/cessna-180): 1 cases ## Other findings in the same cases - [Aircraft control](https://openairdocs.org/ntsb-findings/02063040) (Personnel issues): 6 cases - [Performance/control parameters, general](https://openairdocs.org/ntsb-findings/01062000) (Aircraft): 5 cases - [Modification/alteration](https://openairdocs.org/ntsb-findings/02062030) (Personnel issues): 3 cases - [Not determined, general](https://openairdocs.org/ntsb-findings/05000000) (Not determined): 2 cases - [Animal(s)/bird(s)](https://openairdocs.org/ntsb-findings/03022045) (Environmental issues): 2 cases - [Person](https://openairdocs.org/ntsb-findings/03022035) (Environmental issues): 2 cases - [Installation](https://openairdocs.org/ntsb-findings/02062035) (Personnel issues): 2 cases - [Incorrect action performance](https://openairdocs.org/ntsb-findings/02041015) (Personnel issues): 2 cases - [Airspeed](https://openairdocs.org/ntsb-findings/01062010) (Aircraft): 2 cases - [Spar (on wing)](https://openairdocs.org/ntsb-findings/01035711) (Aircraft): 2 cases ## Newest cases - [NTSB ERA25LA040](https://openairdocs.org/ntsb/ERA25LA040), Nov 5, 2024: Hughes 369D (N11AS), Waycross, GA, substantial damage. Probable cause: An encounter with a foreign object, which resulted in a loss of control and collision with terrain. - [NTSB WPR24LA300](https://openairdocs.org/ntsb/WPR24LA300), Aug 31, 2024: Pacific Aerospace 750XL (N902ST), Mulino, OR, substantial damage. Probable cause: The skydiver’s unintentional parachute deployment and subsequent entanglement with the airplane’s horizontal stabilizer. - [NTSB DCA24LA295](https://openairdocs.org/ntsb/DCA24LA295), Aug 31, 2024: Airbus A330-323 (N808NW), Atlanta, GA, minor damage. Probable cause: Delta Air Lines flight crew’s incorrect evaluation of the clearance between their airplane and the airplane directly ahead of them as they made a 90 degree right turn onto an adjacent taxiway. - [NTSB CEN24LA197](https://openairdocs.org/ntsb/CEN24LA197), May 25, 2024: Cessna U206 (N29173), Butler, MO, destroyed. Probable cause: The jumper’s unintentional deployment of his emergency parachute and subsequent impact with the airplane’s horizontal stabilizer. - [NTSB CEN24FA160](https://openairdocs.org/ntsb/CEN24FA160), Apr 16, 2024: Piper PA 46-350P (N451MA), Hartsburg, MO, destroyed, 1 fatal. Probable cause: The pilot’s encounter with convective weather conditions, which resulted in a loss of airplane control, the exceedance of the airplane’s never exceed speed, and the resulting overload failure of the… - [NTSB WPR22FA184](https://openairdocs.org/ntsb/WPR22FA184), May 22, 2022: Bruce R Prouse M24 Orion Plus (N590DM), Cape Girardeau, MO, substantial damage, 1 fatal. Probable cause: The pilot’s failure to maintain controlled flight, which resulted in a hard left roll, excessive blade flapping and a subsequent in-flight separation of the right horizontal stabilizer. - [NTSB ERA21LA106](https://openairdocs.org/ntsb/ERA21LA106), Jan 19, 2021: American AA5 (N5880L), Leesburg, VA, substantial damage. Probable cause: The weakened structure of the left horizontal stabilizer, which resulted in elevator flutter and subsequent partial separation of the left elevator in flight. Contributing to the accident were the… - [NTSB DCA20LA107](https://openairdocs.org/ntsb/DCA20LA107), May 19, 2020: Boeing 737 (N820TJ), Victorville, CA, substantial damage. Probable cause: Improper installation of dorsal fin attach bolts which caused the dorsal fin to separate during flight, substantially damaging the left horizontal stabilizer. - [NTSB CEN20LA173](https://openairdocs.org/ntsb/CEN20LA173), May 9, 2020: Titan Titan Tornado S (N318WH), Haskell, OK, substantial damage. Probable cause: The student pilot/builder’s addition of winglets to the stabilator, which resulted in flutter and overstress failure of the stabilator control horn. - [NTSB ERA20LA080](https://openairdocs.org/ntsb/ERA20LA080), Dec 24, 2019: Team Rocket F-1 F-1 (N230BW), Suffolk, VA, substantial damage. Probable cause: A structural failure of the horizontal stabilizer during aerobatic maneuvers near the airplane’s never-exceed speed. Contributing to the failure was the construction of the horizontal stabilizer that… 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.