# Nacelles/pylons structure - Type: NTSB finding section - Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft structures](https://openairdocs.org/ntsb-findings/0103) › Nacelles/pylons structure - NTSB code: 010354 - Cases: 11 - In the probable cause: 9 - Fatal cases: 2 - All cases: https://openairdocs.org/ntsb-findings/010354/cases.md - Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/010354/cases.md?cause=1 - Page: https://openairdocs.org/ntsb-findings/010354 ## Cases per year (in the probable cause / all) - 2010: 2 / 2 - 2011: 1 / 1 - 2012: 1 / 1 - 2013: 1 / 1 - 2016: 1 / 1 - 2017: 0 / 1 - 2018: 1 / 1 - 2019: 1 / 1 - 2021: 1 / 2 ## Findings - [Nacelle/pylon misc structure](https://openairdocs.org/ntsb-findings/01035420): 5 cases, 3 in the probable cause - [Nacelles/pylons structure, general](https://openairdocs.org/ntsb-findings/01035400): 2 cases, 2 in the probable cause - [Main frame (on nacelles/pylon)](https://openairdocs.org/ntsb-findings/01035410): 2 cases, 2 in the probable cause - [Attach fittings (nac/pylon)](https://openairdocs.org/ntsb-findings/01035415): 2 cases, 2 in the probable cause - [Plates/skins (nacelle/pylon)](https://openairdocs.org/ntsb-findings/01035414): 1 cases, 1 in the probable cause ## Defining events in these cases - [Loss of engine power (total)](https://openairdocs.org/ntsb-events/341): 2 cases - [Powerplant sys/comp malf/fail](https://openairdocs.org/ntsb-events/340): 2 cases - [Part(s) separation from AC](https://openairdocs.org/ntsb-events/338): 2 cases - [Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330): 2 cases - [Fire/smoke (non-impact)](https://openairdocs.org/ntsb-events/150): 2 cases - [Collision with terr/obj (non-CFIT) ](https://openairdocs.org/ntsb-events/470): 1 cases ## Aircraft models (registry) - [Boeing 737-7H4](https://openairdocs.org/model/boeing-737-7h4): 2 cases - [Eurocopter EC 130 B4](https://openairdocs.org/model/eurocopter-ec-130-b4): 1 cases - [Hughes Helicopters HUGHES 369D](https://openairdocs.org/model/hughes-helicopters-hughes-369d): 1 cases - [Hawker Beechcraft 400A](https://openairdocs.org/model/hawker-beechcraft-400a): 1 cases - [Airbus Industrie A320-232](https://openairdocs.org/model/airbus-industrie-a320-232): 1 cases - [Bombardier CL-600-2C11](https://openairdocs.org/model/bombardier-cl-600-2c11): 1 cases - [Boeing 767-338](https://openairdocs.org/model/boeing-767-338): 1 cases - [Boeing 707-321B](https://openairdocs.org/model/boeing-707-321b): 1 cases - [Skykits SAVANNAH VG](https://openairdocs.org/model/skykits-savannah-vg): 1 cases - [Lester Robert E KR-2](https://openairdocs.org/model/lester-robert-e-kr-2): 1 cases ## Other findings in the same cases - [Compressor section](https://openairdocs.org/ntsb-findings/01057230) (Aircraft): 2 cases - [Availability of documents/info](https://openairdocs.org/ntsb-findings/04022040) (Organizational issues): 1 cases - [Drizzle/mist](https://openairdocs.org/ntsb-findings/03035050) (Environmental issues): 1 cases - [Rain](https://openairdocs.org/ntsb-findings/03035035) (Environmental issues): 1 cases - [Low temperature](https://openairdocs.org/ntsb-findings/03031010) (Environmental issues): 1 cases - [Fence/fence post](https://openairdocs.org/ntsb-findings/03022047) (Environmental issues): 1 cases - [Object/animal/substance, general](https://openairdocs.org/ntsb-findings/03022000) (Environmental issues): 1 cases - [Inspection, general](https://openairdocs.org/ntsb-findings/02061500) (Personnel issues): 1 cases - [Miscellaneous, general](https://openairdocs.org/ntsb-findings/02050000) (Personnel issues): 1 cases - [Decision making/judgment](https://openairdocs.org/ntsb-findings/02041520) (Personnel issues): 1 cases ## Newest cases - [NTSB ERA21LA379](https://openairdocs.org/ntsb/ERA21LA379), Sep 14, 2021: Hawker Beechcraft 400A (N100FN), Charleston, SC, substantial damage. Probable cause: The in-flight separation of the left engine’s four-panel cowling for reasons that could not be determined based on the available evidence. - [NTSB ENG21LA013](https://openairdocs.org/ntsb/ENG21LA013), Jan 29, 2021: Boeing 767-338 (N363CM), Ontario, CA, incident, minor damage. Probable cause: The fatigue fracture and liberation of two airfoils from a low pressure turbine stage 5 nozzle segment that impacted and damaged the downstream low pressure stage 5 blades creating an initial… - [NTSB ERA19FA118](https://openairdocs.org/ntsb/ERA19FA118), Mar 5, 2019: Hughes 369 (N89ZC), Talking Rock, GA, substantial damage, 1 fatal. Probable cause: A fatigue failure of the overrunning clutch subassembly due to abnormal bending loads due to cracks on the center engine mount, which resulted in an inflight loss of power. Contributing to the… - [NTSB DCA18MA142](https://openairdocs.org/ntsb/DCA18MA142), Apr 17, 2018: Boeing 737 7H4 (N772SW), Philadelphia, PA, substantial damage, 1 fatal. Probable cause: A low-cycle fatigue crack in the dovetail of fan blade No. 13, which resulted in the fan blade separating in flight and impacting the engine fan case at a location that was critical to the structural… - [NTSB DCA17LA182](https://openairdocs.org/ntsb/DCA17LA182), Jul 2, 2017: Bombardier CL 600 2C10 (N796SK), Denver, CO, substantial damage. Probable cause: The fuel supply tube fitting pulling out of the left engine’s operability bleed valve (OBV) during the landing rollout, allowing fuel to leak and contact hot engine cases, which ignited a fire that… - [NTSB DCA16FA217](https://openairdocs.org/ntsb/DCA16FA217), Aug 27, 2016: Boeing 737-700 (N766SW), Pensacola, FL, substantial damage. Probable cause: A low-cycle fatigue crack in the dovetail of fan blade No. 23, which resulted in the fan blade separating in flight and impacting the fan case. This impact caused the fan blade to fracture into… - [NTSB CEN13FA121](https://openairdocs.org/ntsb/CEN13FA121), Jan 2, 2013: Eurocopter EC130 B4 (N334AM), Seminole, OK, substantial damage. Probable cause: The loss of engine power due to ice ingestion. Contributing to the accident was maintenance personnel’s delayed decision to install the helicopter's engine inlet cover until after the engine had been… - [NTSB ERA12CA198](https://openairdocs.org/ntsb/ERA12CA198), Mar 1, 2012: Lester Robert E KR-2 (N1701L), Boca Raton, FL, substantial damage. Probable cause: The failure of the airplane’s engine air inlet system resulting in a total loss of engine power. - [NTSB DCA11PA075](https://openairdocs.org/ntsb/DCA11PA075), May 19, 2011: Boeing 707-321B (N707AR), Point Mugu, CA, substantial damage. Probable cause: the failure of a midspar fitting, which was susceptible to fatigue cracking and should have been replaced with a newer, more fatigue-resistant version of the fitting as required by an airworthiness… - [NTSB ERA10CA495](https://openairdocs.org/ntsb/ERA10CA495), Sep 20, 2010: Skykits Savannah (N63XT), Springville, TN, substantial damage. Probable cause: Collision with an unknown object during landing. 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.