# Stabilizer control system - Type: NTSB finding subsection - Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft systems](https://openairdocs.org/ntsb-findings/0102) › [Flight control system](https://openairdocs.org/ntsb-findings/010227) › Stabilizer control system - NTSB code: 01022740 - Cases: 13 - In the probable cause: 11 - Fatal cases: 4 - All cases: https://openairdocs.org/ntsb-findings/01022740/cases.md - Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01022740/cases.md?cause=1 - Page: https://openairdocs.org/ntsb-findings/01022740 ## Cases per year (in the probable cause / all) - 2008: 2 / 3 - 2010: 1 / 1 - 2012: 1 / 1 - 2013: 2 / 2 - 2015: 1 / 1 - 2019: 0 / 1 - 2021: 1 / 1 - 2022: 2 / 2 - 2023: 1 / 1 ## Defining events in these cases - [Flight control sys malf/fail](https://openairdocs.org/ntsb-events/333): 7 cases - [Loss of control in flight](https://openairdocs.org/ntsb-events/240): 3 cases - [Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330): 2 cases - [Hard landing](https://openairdocs.org/ntsb-events/092): 1 cases ## Aircraft models (registry) - [MD Helicopters MD 900](https://openairdocs.org/model/md-helicopters-md-900): 2 cases - [Piper PA-34-220T](https://openairdocs.org/model/piper-pa-34-220t): 1 cases - [Piper PA-28RT-201](https://openairdocs.org/model/piper-pa-28rt-201): 1 cases - [Piper PA-23-250](https://openairdocs.org/model/piper-pa-23-250): 1 cases - [Airbus A330-243](https://openairdocs.org/model/airbus-a330-243): 1 cases - [Embraer-Empresa Brasileira De ERJ 170-200 LR](https://openairdocs.org/model/embraer-empresa-brasileira-de-erj-170-200-lr): 1 cases - [Dehavilland DHC-3](https://openairdocs.org/model/dehavilland-dhc-3): 1 cases - [Boeing 747-428](https://openairdocs.org/model/boeing-747-428): 1 cases - [Beech C-99](https://openairdocs.org/model/beech-c-99): 1 cases - [James R Schilling RANS S19](https://openairdocs.org/model/james-r-schilling-rans-s19): 1 cases ## Other findings in the same cases - [Installation](https://openairdocs.org/ntsb-findings/02062035) (Personnel issues): 3 cases - [Scheduled/routine maintenance](https://openairdocs.org/ntsb-findings/02062010) (Personnel issues): 3 cases - [Adequacy of policy/proc](https://openairdocs.org/ntsb-findings/04021015) (Organizational issues): 2 cases - [Incorrect action selection](https://openairdocs.org/ntsb-findings/02041010) (Personnel issues): 2 cases - [Maintenance records](https://openairdocs.org/ntsb-findings/04033025) (Organizational issues): 1 cases - [Oversight of operation](https://openairdocs.org/ntsb-findings/04032015) (Organizational issues): 1 cases - [Document/info production](https://openairdocs.org/ntsb-findings/04013020) (Organizational issues): 1 cases - [Scheduled/routine inspection](https://openairdocs.org/ntsb-findings/02061520) (Personnel issues): 1 cases - [Inspection, general](https://openairdocs.org/ntsb-findings/02061500) (Personnel issues): 1 cases - [Lack of action](https://openairdocs.org/ntsb-findings/02041030) (Personnel issues): 1 cases ## Newest cases - [NTSB ERA23FA346](https://openairdocs.org/ntsb/ERA23FA346), Aug 22, 2023: Beech C-99 (N55RP), Litchfield, ME, destroyed, 2 fatal. Probable cause: A horizontal stabilizer pitch trim anomaly that was not identified in the available evidence. - [NTSB DCA22LA212](https://openairdocs.org/ntsb/DCA22LA212), Sep 22, 2022: Airbus A330-243 (N393HA), Los Angeles, CA, incident, no damage. Probable cause: Uncommanded movement of the trimmable horizontal stabilizer control wheel for reasons that could not be determined based on the available evidence. - [NTSB DCA22MA193](https://openairdocs.org/ntsb/DCA22MA193), Sep 4, 2022: Dehavilland DHC-3 (N725TH), Freeland, WA, destroyed, 10 fatal. Probable cause: The in-flight unthreading of the clamp nut from the horizontal stabilizer trim actuator barrel due to a missing lock ring, which resulted in the horizontal stabilizer moving to an extreme… - [NTSB CEN21LA363](https://openairdocs.org/ntsb/CEN21LA363), Aug 7, 2021: Rotary RAF2000 (UNREG), Anahuac, TX, substantial damage. Probable cause: The pilot’s incorrect trim system installation, which resulted in a loss of gyroplane control and impact with terrain. - [NTSB DCA20IA014](https://openairdocs.org/ntsb/DCA20IA014), Nov 7, 2019: Embraer ERJ170 (N117HQ), Atlanta, GA, incident, no damage. Probable cause: The captain’s use of his pitch trim switch, which had been placarded inoperative but not deactivated, resulting in the airplane pitching up when the captain was trying to trim down. The trim commands… - [NTSB ERA15LA360](https://openairdocs.org/ntsb/ERA15LA360), Sep 15, 2015: J. Schilling S-19 (N8DV), East Falmouth, MA, substantial damage. Probable cause: The experimental airplane builder's failure to properly secure the stabilator trim tab push-pull tube’s connection, which resulted in the tube’s separation and a subsequent hard landing. Contributing… - [NTSB ERA13IA396](https://openairdocs.org/ntsb/ERA13IA396), Aug 31, 2013: Piper PA-28RT-201 (N2091W), Chesapeake, VA, incident, no damage. Probable cause: Maintenance personnel’s inadequate inspection and compliance with a Federal Aviation Administration airworthiness directive, which resulted in an undetected corroded and cracked stabilator turnbuckle… - [NTSB DCA13MA081](https://openairdocs.org/ntsb/DCA13MA081), Apr 29, 2013: Boeing 747-400 BCF (N949CA), Bagram, Afghanistan, destroyed, 7 fatal. Probable cause: National Airlines' inadequate procedures for restraining special cargo loads, which resulted in the loadmaster's improper restraint of the cargo, which moved aft and damaged hydraulic systems Nos. 1… - [NTSB ERA12IA237](https://openairdocs.org/ntsb/ERA12IA237), Mar 14, 2012: Piper PA-32R-300 (N1358H), Warrenton, VA, incident, no damage. Probable cause: Maintenance personnel's failure to identify stress corrosion cracking in the stabilator control cable during the most recent inspection, and the subsequent failure of the cable on the flight after… - [NTSB CEN10LA312](https://openairdocs.org/ntsb/CEN10LA312), Jun 9, 2010: Piper PA-34-220T (N104NW), Ankeny, IA, substantial damage. Probable cause: The failure of the stabilator control cable due to wear. Contributing to the accident was the inadequate maintenance inspection of the stabilator control cable. 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.