# Nacelle/pylon misc structure

- Type: NTSB finding subsection
- Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft structures](https://openairdocs.org/ntsb-findings/0103) › [Nacelles/pylons structure](https://openairdocs.org/ntsb-findings/010354) › Nacelle/pylon misc structure
- NTSB code: 01035420
- Cases: 5
- In the probable cause: 3
- Fatal cases: 1
- All cases: https://openairdocs.org/ntsb-findings/01035420/cases.md
- Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01035420/cases.md?cause=1
- Page: https://openairdocs.org/ntsb-findings/01035420

## Cases per year (in the probable cause / all)

- 2012: 1 / 1
- 2017: 0 / 1
- 2018: 1 / 1
- 2021: 1 / 2

## Defining events in these cases

- [Fire/smoke (non-impact)](https://openairdocs.org/ntsb-events/150): 2 cases
- [Loss of engine power (total)](https://openairdocs.org/ntsb-events/341): 1 cases
- [Powerplant sys/comp malf/fail](https://openairdocs.org/ntsb-events/340): 1 cases
- [Part(s) separation from AC](https://openairdocs.org/ntsb-events/338): 1 cases

## Aircraft models (registry)

- [Hawker Beechcraft 400A](https://openairdocs.org/model/hawker-beechcraft-400a): 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 737-7H4](https://openairdocs.org/model/boeing-737-7h4): 1 cases
- [Lester Robert E KR-2](https://openairdocs.org/model/lester-robert-e-kr-2): 1 cases

## Other findings in the same cases

- [Availability of documents/info](https://openairdocs.org/ntsb-findings/04022040) (Organizational issues): 1 cases
- [Miscellaneous, general](https://openairdocs.org/ntsb-findings/02050000) (Personnel issues): 1 cases
- [Lack of action](https://openairdocs.org/ntsb-findings/02041030) (Personnel issues): 1 cases
- [Engine exhaust, general](https://openairdocs.org/ntsb-findings/01057800) (Aircraft): 1 cases
- [Compressor bleed valve](https://openairdocs.org/ntsb-findings/01057532) (Aircraft): 1 cases
- [Engine bleed air system, general](https://openairdocs.org/ntsb-findings/01057500) (Aircraft): 1 cases
- [Turbine section](https://openairdocs.org/ntsb-findings/01057250) (Aircraft): 1 cases
- [Compressor section](https://openairdocs.org/ntsb-findings/01057230) (Aircraft): 1 cases
- [Passenger compartment windows](https://openairdocs.org/ntsb-findings/01035620) (Aircraft): 1 cases
- [Aircraft structures, general](https://openairdocs.org/ntsb-findings/01030000) (Aircraft): 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 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 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 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.

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