# Attach fittings (on wing) - Type: NTSB finding subsection - Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft structures](https://openairdocs.org/ntsb-findings/0103) › [Wing structure](https://openairdocs.org/ntsb-findings/010357) › Attach fittings (on wing) - NTSB code: 01035740 - Cases: 21 - In the probable cause: 20 - Fatal cases: 12 - All cases: https://openairdocs.org/ntsb-findings/01035740/cases.md - Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01035740/cases.md?cause=1 - Page: https://openairdocs.org/ntsb-findings/01035740 ## Cases per year (in the probable cause / all) - 2009: 1 / 2 - 2010: 2 / 2 - 2011: 1 / 1 - 2013: 2 / 2 - 2015: 1 / 1 - 2016: 3 / 3 - 2017: 1 / 1 - 2018: 2 / 2 - 2019: 1 / 1 - 2021: 2 / 2 - 2022: 2 / 2 - 2024: 1 / 1 - 2026: 1 / 1 ## Defining events in these cases - [Aircraft structural failure](https://openairdocs.org/ntsb-events/337): 11 cases - [Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330): 3 cases - [Part(s) separation from AC](https://openairdocs.org/ntsb-events/338): 2 cases - [Miscellaneous/other](https://openairdocs.org/ntsb-events/900): 1 cases - [Flight control sys malf/fail](https://openairdocs.org/ntsb-events/333): 1 cases - [Aerodynamic stall/spin](https://openairdocs.org/ntsb-events/241): 1 cases - [Loss of control in flight](https://openairdocs.org/ntsb-events/240): 1 cases - [Nose over/nose down](https://openairdocs.org/ntsb-events/096): 1 cases ## Aircraft models (registry) - [WSK PZL Mielec M-18A](https://openairdocs.org/model/wsk-pzl-mielec-m-18a): 2 cases - [Pzl-Swidnik PW-5](https://openairdocs.org/model/pzl-swidnik-pw-5): 1 cases - [Weatherly 620B](https://openairdocs.org/model/weatherly-620b): 1 cases - [I.C.A.-Brasov IS-29D](https://openairdocs.org/model/i-c-a-brasov-is-29d): 1 cases - [Elan Flight DG-500 ELAN TRAINER](https://openairdocs.org/model/elan-flight-dg-500-elan-trainer): 1 cases - [Dehavilland DHC 2 MK III](https://openairdocs.org/model/dehavilland-dhc-2-mk-iii): 1 cases - [Seamax Aircraft Ltda SEAMAX M-22](https://openairdocs.org/model/seamax-aircraft-ltda-seamax-m-22): 1 cases - [Evolution REVO](https://openairdocs.org/model/evolution-revo): 1 cases - [Airborne Windsports PTY EDGE XT-912-L](https://openairdocs.org/model/airborne-windsports-pty-edge-xt-912-l): 1 cases - [Airborne WINDSPORT EDGE](https://openairdocs.org/model/airborne-windsport-edge): 1 cases ## Other findings in the same cases - [Incorrect action performance](https://openairdocs.org/ntsb-findings/02041015) (Personnel issues): 5 cases - [Scheduled/routine maintenance](https://openairdocs.org/ntsb-findings/02062010) (Personnel issues): 4 cases - [Aircraft control](https://openairdocs.org/ntsb-findings/02063040) (Personnel issues): 3 cases - [Oversight of maintenance](https://openairdocs.org/ntsb-findings/04032020) (Organizational issues): 2 cases - [Oversight of operation](https://openairdocs.org/ntsb-findings/04032015) (Organizational issues): 2 cases - [Preflight inspection](https://openairdocs.org/ntsb-findings/02061510) (Personnel issues): 2 cases - [Lateral/bank control](https://openairdocs.org/ntsb-findings/01062023) (Aircraft): 2 cases - [Maximum weight](https://openairdocs.org/ntsb-findings/01061035) (Aircraft): 2 cases - [Documentation/record keeping, general](https://openairdocs.org/ntsb-findings/04033000) (Organizational issues): 1 cases - [Adequacy of policy/proc](https://openairdocs.org/ntsb-findings/04021015) (Organizational issues): 1 cases ## Newest cases - [NTSB WPR26LA203](https://openairdocs.org/ntsb/WPR26LA203), May 23, 2026: Pzl-Swidnik PW-5 (N157AJ), Soap Lake, WA, substantial damage. Probable cause: The pilot’s failure to ensure the proper preflight assembly of the glider's wing attachment system, which resulted in substantial damage to the wing structure during flight. - [NTSB ERA24FA395](https://openairdocs.org/ntsb/ERA24FA395), Sep 25, 2024: Evolution Revo (N889HT), Zephyrhills, FL, destroyed, 2 fatal. Probable cause: The flight instructor’s failure to ensure the haul back cable was securely connected to the “J” hook prior to departing on the accident flight, which resulted in the cable becoming disconnected and… - [NTSB ERA23FA007](https://openairdocs.org/ntsb/ERA23FA007), Oct 6, 2022: Seamax M-22 (N46PD), East Hampton, NY, substantial damage, 1 fatal. Probable cause: An inflight separation of the right wing as a result of the manufacturer’s application of a bolt and nut in the upper wing strut attachment point that was inconsistent with the nut design intent and… - [NTSB ERA22FA320](https://openairdocs.org/ntsb/ERA22FA320), Jul 18, 2022: Knight AA Nieuport 28 (N6170), Basehor, KS, destroyed, 1 fatal. Probable cause: The pilot’s incorrect installation of the left-wing strut, which resulted in a loss of airplane control during takeoff and a subsequent aerodynamic stall and spin from which the pilot could not… - [NTSB CEN21LA420](https://openairdocs.org/ntsb/CEN21LA420), Sep 11, 2021: Quad City Ultralight Challenger II (N778H), Rogers City, MI, substantial damage. Probable cause: The separation of the right wing’s forward lift strut from the fuselage due to a missing nylon-insert lock nut. Contributing to the accident was the noncertificated pilot’s decision to operate the… - [NTSB CEN21FA314](https://openairdocs.org/ntsb/CEN21FA314), Jul 12, 2021: PZL Mielec M18 (N9310R), Seiling, OK, destroyed, 1 fatal. Probable cause: The pilot’s in-flight loss of control due to the structural failure of a wing fitting and separation of the outboard wing section. Also causal were the inadequate wing fitting inspections, which… - [NTSB WPR20LA004](https://openairdocs.org/ntsb/WPR20LA004), Oct 6, 2019: Glaser Dirks DG500 (N600TT), Marana, AZ, substantial damage. Probable cause: The pilots’ exceedance of the glider’s never-exceed speed (VNE) during recovery from an intentional aerobatic maneuver, which resulted in a failure of the right-wing air brake control drive,… - [NTSB CEN18FA282](https://openairdocs.org/ntsb/CEN18FA282), Jul 19, 2018: Fisher Celebrity (N228LC), Patriot, IN, destroyed, 1 fatal. Probable cause: An in-flight separation of the right wing due to upward and rearward bending that led to an overstress fracture. The reason for the upward and rearward bending could not be determined based on the… - [NTSB WPR18FA143](https://openairdocs.org/ntsb/WPR18FA143), May 19, 2018: I.C.A.-Brasov IS 29D (N38ES), Avenal, CA, destroyed, 1 fatal. Probable cause: The pilot's improper installation of the wings onto the glider, which resulted in an in-flight wing separation. Contributing to the accident were the pilot's limited familiarity with the design and a… - [NTSB ERA17FA265](https://openairdocs.org/ntsb/ERA17FA265), Aug 6, 2017: North Wing Freedom (N2854L), Green Township, NJ, substantial damage, 1 fatal. Probable cause: The pilot's improper preflight setup of the aircraft's foldable wing, during which he incorrectly attached a nylon strap loop pull handle, instead of the steel cable shackle at the end of the strap,… 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.