# Longerons/stringers (main fus)

- Type: NTSB finding subsection
- Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft structures](https://openairdocs.org/ntsb-findings/0103) › [Fuselage](https://openairdocs.org/ntsb-findings/010353) › Longerons/stringers (main fus)
- NTSB code: 01035313
- Cases: 4
- In the probable cause: 3
- Fatal cases: 1
- All cases: https://openairdocs.org/ntsb-findings/01035313/cases.md
- Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01035313/cases.md?cause=1
- Page: https://openairdocs.org/ntsb-findings/01035313

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

- 2011: 0 / 1
- 2018: 1 / 1
- 2019: 1 / 1
- 2023: 1 / 1

## Defining events in these cases

- [Birdstrike](https://openairdocs.org/ntsb-events/901): 1 cases
- [Aircraft structural failure](https://openairdocs.org/ntsb-events/337): 1 cases
- [Hard landing](https://openairdocs.org/ntsb-events/092): 1 cases
- [Unknown or undetermined](https://openairdocs.org/ntsb-events/000): 1 cases

## Aircraft models (registry)

- [Piper PA-18-150](https://openairdocs.org/model/piper-pa-18-150): 1 cases
- [Boeing 737-7BD](https://openairdocs.org/model/boeing-737-7bd): 1 cases
- [Bell 407](https://openairdocs.org/model/bell-407): 1 cases
- [Bothof Larry D SABERWING](https://openairdocs.org/model/bothof-larry-d-saberwing): 1 cases

## Other findings in the same cases

- [Gusts](https://openairdocs.org/ntsb-findings/03034045) (Environmental issues): 1 cases
- [Aircraft control](https://openairdocs.org/ntsb-findings/02063040) (Personnel issues): 1 cases
- [Decision making/judgment](https://openairdocs.org/ntsb-findings/02041520) (Personnel issues): 1 cases
- [Unnecessary action](https://openairdocs.org/ntsb-findings/02041045) (Personnel issues): 1 cases
- [Aircraft capability, general](https://openairdocs.org/ntsb-findings/01061000) (Aircraft): 1 cases

## Newest cases

- [NTSB ENG23LA045](https://openairdocs.org/ntsb/ENG23LA045), Sep 21, 2023: Bell 407 (N406TD), Linden, NJ, incident, no damage. Probable cause: The fracture of the upper-left tail boom attachment bolt due to abnormal loading of the bolt caused by a gap and misalignment between the upper-left longeron and the tail boom. Contributing to this…
- [NTSB DCA20CA050](https://openairdocs.org/ntsb/DCA20CA050), Dec 22, 2019: Boeing 737 (N7739A), Kansas City, MO, substantial damage. Probable cause: a bird strike during descent
- [NTSB ERA19FA068](https://openairdocs.org/ntsb/ERA19FA068), Dec 18, 2018: Saberwing Saberwing (N203SW), Adel, GA, substantial damage, 1 fatal. Probable cause: The in-flight failure of the fuselage, as a result of the pilot conducting maneuvers that exceeded the structural capabilities of the airplane.
- [NTSB ANC11CA115](https://openairdocs.org/ntsb/ANC11CA115), Sep 26, 2011: Piper PA-18-150 (N8998Y), Fairbanks, AK, substantial damage. Probable cause: The student pilot's hard landing in a gusting wind.

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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