# Unscheduled maint checks - Type: NTSB finding subsection - Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft handling/service](https://openairdocs.org/ntsb-findings/0101) › [Maintenance/inspections](https://openairdocs.org/ntsb-findings/010105) › Unscheduled maint checks - NTSB code: 01010550 - Cases: 6 - In the probable cause: 5 - Fatal cases: 0 - All cases: https://openairdocs.org/ntsb-findings/01010550/cases.md - Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01010550/cases.md?cause=1 - Page: https://openairdocs.org/ntsb-findings/01010550 ## Cases per year (in the probable cause / all) - 2008: 1 / 1 - 2010: 0 / 1 - 2012: 1 / 1 - 2014: 1 / 1 - 2015: 1 / 1 - 2021: 1 / 1 ## Defining events in these cases - [Loss of engine power (total)](https://openairdocs.org/ntsb-events/341): 2 cases - [Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330): 2 cases - [Landing gear collapse](https://openairdocs.org/ntsb-events/094): 1 cases - [Abnormal runway contact](https://openairdocs.org/ntsb-events/090): 1 cases ## Aircraft models (registry) - [Piper PA-28RT-201](https://openairdocs.org/model/piper-pa-28rt-201): 1 cases - [Piper PA-28-140](https://openairdocs.org/model/piper-pa-28-140): 1 cases - [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232): 1 cases - [Cessna R182](https://openairdocs.org/model/cessna-r182): 1 cases - [Beech B36TC](https://openairdocs.org/model/beech-b36tc): 1 cases ## Other findings in the same cases - [Installation](https://openairdocs.org/ntsb-findings/02062035) (Personnel issues): 2 cases - [Document/info production](https://openairdocs.org/ntsb-findings/04013020) (Organizational issues): 1 cases - [Scheduled/routine maintenance](https://openairdocs.org/ntsb-findings/02062010) (Personnel issues): 1 cases - [Scheduled/routine inspection](https://openairdocs.org/ntsb-findings/02061520) (Personnel issues): 1 cases - [Fuel controlling system](https://openairdocs.org/ntsb-findings/01057320) (Aircraft): 1 cases - [Power plant, general](https://openairdocs.org/ntsb-findings/01057100) (Aircraft): 1 cases - [Landing gear doors](https://openairdocs.org/ntsb-findings/01035280) (Aircraft): 1 cases - [Landing gear actuator](https://openairdocs.org/ntsb-findings/01023233) (Aircraft): 1 cases - [Main gear strut/axle/truck](https://openairdocs.org/ntsb-findings/01023213) (Aircraft): 1 cases - [Hydraulic, main system](https://openairdocs.org/ntsb-findings/01022910) (Aircraft): 1 cases ## Newest cases - [NTSB WPR22LA005](https://openairdocs.org/ntsb/WPR22LA005), Oct 9, 2021: Beech B36TC (N7220B), Los Banos, CA, substantial damage. Probable cause: The total loss of engine power due to the improper installation of the No. 4 connecting rod bolt nut during a recent overhaul. - [NTSB ERA15LA341](https://openairdocs.org/ntsb/ERA15LA341), Sep 4, 2015: Piper PA 28RT-201 (N8162S), Russell Springs, KY, substantial damage. Probable cause: Maintenance personnel’s inadequate fuel injection servo maintenance due to an out-of-date AD list, which resulted in the fuel injection servo plug backing out of the threaded plug hole on the… - [NTSB WPR14CA295](https://openairdocs.org/ntsb/WPR14CA295), Jul 18, 2014: Cessna R182 (N7571T), El Monte, CA, substantial damage. Probable cause: The failure of the right main landing gear pivot assembly. Contributing to the accident was the owner's failure to perform an inspection of the assembly in accordance with the manufacturer's service… - [NTSB DCA12IA096](https://openairdocs.org/ntsb/DCA12IA096), Jun 17, 2012: Airbus A320 (N552JB), Las Vegas, NV, incident, no damage. Probable cause: the failure of the right main landing gear door retraction flexible hydraulic line in the Green hydraulic system, which led to prolonged operation of the power transfer unit and subsequent… - [NTSB WPR11LA074](https://openairdocs.org/ntsb/WPR11LA074), Dec 10, 2010: Piper PA-28-140 (N5800U), Chino, CA, substantial damage. Probable cause: Fatigue cracking of the upper torque-link attach lugs on the left main landing gear strut, which resulted in separation of the left main landing gear during taxi. - [NTSB CEN09FA094](https://openairdocs.org/ntsb/CEN09FA094), Dec 16, 2008: Bombardier CL-600-2C10 (N511MJ), Chicago, IL, incident, minor damage. Probable cause: The failure of the left landing gear to extend due to improper maintenance when the landing gear door was replaced. Contributing to the incident was the manufacturer's inadequate maintenance manual… 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.