# Modification/alteration - Type: NTSB finding subsection - Path: [Personnel issues](https://openairdocs.org/ntsb-findings/02) › [Task performance](https://openairdocs.org/ntsb-findings/0206) › [Maintenance](https://openairdocs.org/ntsb-findings/020620) › Modification/alteration - NTSB code: 02062030 - Cases: 69 - In the probable cause: 59 - Fatal cases: 12 - All cases: https://openairdocs.org/ntsb-findings/02062030/cases.md - Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/02062030/cases.md?cause=1 - Page: https://openairdocs.org/ntsb-findings/02062030 ## Cases per year (in the probable cause / all) - 2008: 5 / 6 - 2009: 1 / 1 - 2010: 5 / 6 - 2011: 1 / 3 - 2012: 3 / 3 - 2013: 6 / 6 - 2014: 7 / 7 - 2015: 5 / 5 - 2016: 3 / 3 - 2017: 2 / 4 - 2018: 5 / 5 - 2019: 2 / 2 - 2020: 3 / 5 - 2021: 2 / 3 - 2022: 3 / 3 - 2023: 2 / 2 - 2024: 2 / 2 - 2025: 2 / 3 ## Defining events in these cases - [Loss of engine power (partial)](https://openairdocs.org/ntsb-events/342): 13 cases - [Loss of engine power (total)](https://openairdocs.org/ntsb-events/341): 12 cases - [Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330): 8 cases - [Flight control sys malf/fail](https://openairdocs.org/ntsb-events/333): 7 cases - [Fuel starvation](https://openairdocs.org/ntsb-events/191): 6 cases - [Loss of control in flight](https://openairdocs.org/ntsb-events/240): 5 cases - [Fire/smoke (non-impact)](https://openairdocs.org/ntsb-events/150): 4 cases - [Aircraft structural failure](https://openairdocs.org/ntsb-events/337): 2 cases - [Loss of control on ground](https://openairdocs.org/ntsb-events/230): 2 cases - [Collision during takeoff/land](https://openairdocs.org/ntsb-events/490): 1 cases ## Aircraft models (registry) - [Ferdon THORP T-18](https://openairdocs.org/model/ferdon-thorp-t-18): 1 cases - [Socata TB21](https://openairdocs.org/model/socata-tb21): 1 cases - [Mckeehan James F ACRODUSTER SA750](https://openairdocs.org/model/mckeehan-james-f-acroduster-sa750): 1 cases - [Schweizer SGS 2-33AK](https://openairdocs.org/model/schweizer-sgs-2-33ak): 1 cases - [Piper PA-28-180](https://openairdocs.org/model/piper-pa-28-180): 1 cases - [Piper PA-22-150](https://openairdocs.org/model/piper-pa-22-150): 1 cases - [Piper PA-12](https://openairdocs.org/model/piper-pa-12): 1 cases - [Mooney M20E](https://openairdocs.org/model/mooney-m20e): 1 cases - [Mooney M20C](https://openairdocs.org/model/mooney-m20c): 1 cases - [Mooney M20A](https://openairdocs.org/model/mooney-m20a): 1 cases ## Other findings in the same cases - [Aircraft control](https://openairdocs.org/ntsb-findings/02063040) (Personnel issues): 13 cases - [Fuel](https://openairdocs.org/ntsb-findings/01071010) (Aircraft): 8 cases - [Decision making/judgment](https://openairdocs.org/ntsb-findings/02041520) (Personnel issues): 7 cases - [Fuel system, general](https://openairdocs.org/ntsb-findings/01022800) (Aircraft): 6 cases - [Installation](https://openairdocs.org/ntsb-findings/02062035) (Personnel issues): 5 cases - [Directional control](https://openairdocs.org/ntsb-findings/01062020) (Aircraft): 5 cases - [Performance/control parameters, general](https://openairdocs.org/ntsb-findings/01062000) (Aircraft): 5 cases - [Fuel control/carburetor](https://openairdocs.org/ntsb-findings/01057322) (Aircraft): 5 cases - [Engine (reciprocating), general](https://openairdocs.org/ntsb-findings/01058500) (Aircraft): 4 cases - [Use of equip/system](https://openairdocs.org/ntsb-findings/02063015) (Personnel issues): 3 cases ## Newest cases - [NTSB WPR26LA056](https://openairdocs.org/ntsb/WPR26LA056), Dec 8, 2025: Rotorway Exec (C-GBZD), Lake Havasu City, AZ, substantial damage. Probable cause: The pilot’s improper securing hardware installation, which resulted in a loss of throttle control and a loss of engine power. - [NTSB ERA25LA223](https://openairdocs.org/ntsb/ERA25LA223), Jun 7, 2025: Piper PA22 (N6804B), Hebron, OH, substantial damage. Probable cause: The airplane owner and pilot’s intentional allowance of unapproved maintenance and maintenance personnel’s failure to adequately maintain or service the brake system, which resulted in a total loss… - [NTSB ERA25LA091](https://openairdocs.org/ntsb/ERA25LA091), Jan 5, 2025: Helio HT-295 (N18JC), Marion, OH, substantial damage. Probable cause: The failure of the right main landing gear spring due to intergranular stress-corrosion cracking that progressed into fatigue. Contributing to the accident was the improper rework of the spring at an… - [NTSB WPR24LA148](https://openairdocs.org/ntsb/WPR24LA148), May 10, 2024: Kjelsrud Gary Kitfox (N605GK), Powell, WY, substantial damage. Probable cause: The pilot’s adjustment of the carburetor to an incorrect setting, which resulted in partial loss of engine power during takeoff. - [NTSB CEN24LA145](https://openairdocs.org/ntsb/CEN24LA145), Apr 2, 2024: Mooney M20E (N86UM), Alpine, AR, substantial damage. Probable cause: The improper maintenance of the cabin air and exhaust system which resulted in a cracked exhaust pipe and damaged cabin air tubing, and the subsequent elevated carbon monoxide levels in the cockpit… - [NTSB WPR24LA034](https://openairdocs.org/ntsb/WPR24LA034), Nov 13, 2023: Cessna 310 (N86H), Hayden, ID, substantial damage. Probable cause: The pilot’s failure to maintain adequate airspeed and his exceedance of the airplane’s critical angle of attack, which resulted in a loss of control and subsequent stall during a precautionary… - [NTSB DCA23FA339](https://openairdocs.org/ntsb/DCA23FA339), Jun 28, 2023: Boeing 717-200 (N955AT), Charlotte, NC, substantial damage. Probable cause: A fatigue fracture of the upper lock link that initiated along scratch features on the lower surface at the parting line of the forged aluminum component. Contributing to the accident was the… - [NTSB WPR22LA243](https://openairdocs.org/ntsb/WPR22LA243), Jul 10, 2022: Mooney M20C (N6416U), Oxnard, CA, substantial damage. Probable cause: Fuel starvation due to an inappropriately maintained and modified fuel selector valve. - [NTSB WPR22FA151](https://openairdocs.org/ntsb/WPR22FA151), Apr 13, 2022: Cessna 208B (N928JP), Heyburn, ID, substantial damage, 1 fatal. Probable cause: The pilot’s failure to maintain altitude during an instrument approach, which resulted in a descent below the approach path and impact with a vent stack. Also causal was the failure of the processing… - [NTSB ERA22LA159](https://openairdocs.org/ntsb/ERA22LA159), Mar 17, 2022: Dwyer Michael D Q (N3QP), Spring Hill, FL, destroyed. Probable cause: The pilot’s improper modification of the pull starter motor, which resulted in its failure and the subsequent loss of engine power. 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.