# Bulkheads (main fuselage)

- 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) › Bulkheads (main fuselage)
- NTSB code: 01035312
- Cases: 8
- In the probable cause: 5
- Fatal cases: 0
- All cases: https://openairdocs.org/ntsb-findings/01035312/cases.md
- Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01035312/cases.md?cause=1
- Page: https://openairdocs.org/ntsb-findings/01035312

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

- 2008: 0 / 1
- 2013: 0 / 1
- 2014: 1 / 1
- 2016: 2 / 2
- 2024: 1 / 2

## Defining events in these cases

- [Aircraft structural failure](https://openairdocs.org/ntsb-events/337): 2 cases
- [Landing gear collapse](https://openairdocs.org/ntsb-events/094): 2 cases
- [Hard landing](https://openairdocs.org/ntsb-events/092): 2 cases
- [Miscellaneous/other](https://openairdocs.org/ntsb-events/900): 1 cases
- [Sys/Comp malf/fail (non-power)](https://openairdocs.org/ntsb-events/330): 1 cases

## Aircraft models (registry)

- [Lockheed 382G-44K-30](https://openairdocs.org/model/lockheed-382g-44k-30): 2 cases
- [Dehavilland DHC-2 MK. I(L20A)](https://openairdocs.org/model/dehavilland-dhc-2-mk-i-l20a): 1 cases
- [Cessna 172S](https://openairdocs.org/model/cessna-172s): 1 cases
- [Cessna 170B](https://openairdocs.org/model/cessna-170b): 1 cases
- [Cessna 140](https://openairdocs.org/model/cessna-140): 1 cases
- [British Aerospace BAE 146 SERIES 200A](https://openairdocs.org/model/british-aerospace-bae-146-series-200a): 1 cases

## Other findings in the same cases

- [Adequacy of policy/proc](https://openairdocs.org/ntsb-findings/04021015) (Organizational issues): 1 cases
- [Selection/certification/testing, general](https://openairdocs.org/ntsb-findings/04012000) (Organizational issues): 1 cases
- [Incorrect action performance](https://openairdocs.org/ntsb-findings/02041015) (Personnel issues): 1 cases
- [Incorrect action selection](https://openairdocs.org/ntsb-findings/02041010) (Personnel issues): 1 cases
- [Spar (on wing)](https://openairdocs.org/ntsb-findings/01035711) (Aircraft): 1 cases
- [Plates/skins (aux fuselage)](https://openairdocs.org/ntsb-findings/01035330) (Aircraft): 1 cases
- [Brake](https://openairdocs.org/ntsb-findings/01023242) (Aircraft): 1 cases
- [Scheduled maint checks](https://openairdocs.org/ntsb-findings/01010520) (Aircraft): 1 cases

## Newest cases

- [NTSB DCA25LA061](https://openairdocs.org/ntsb/DCA25LA061), Dec 18, 2024: Lockheed 382G-44K-30 (N403LC), St. Mary's, AK, substantial damage. Probable cause: The fatigue failure of the forward pressure bulkhead canted web that originated from stress corrosion cracking areas. Contributing to the failure were inspection procedures and intervals inadequate…
- [NTSB ENG24LA012](https://openairdocs.org/ntsb/ENG24LA012), Mar 1, 2024: British Aerospace BAE 146 Series 200A (N474NA), Missoula, MT, incident, minor damage. Probable cause: The use of a new long term fire retardant with a chemical composition incompatible with the retardant previously in use for the integration-operational field evaluation without adequate testing and…
- [NTSB WPR16LA139](https://openairdocs.org/ntsb/WPR16LA139), Jul 8, 2016: Cessna 140 (N89965), Salinas, CA, substantial damage. Probable cause: The fatigue failure of a bulkhead-skin joint that supported the main landing gear leg, which resulted in the collapse of the left main landing gear. Contributing to the failure were the non-original…
- [NTSB DCA16LA096](https://openairdocs.org/ntsb/DCA16LA096), Feb 12, 2016: Lockheed 382G (N401LC), Iliamna, AK, substantial damage. Probable cause: The fatigue failure of the forward pressure bulkhead canted web that originated from stress corrosion cracking areas. Contributing to the failure were inspection procedures and intervals inadequate…
- [NTSB WPR14LA134](https://openairdocs.org/ntsb/WPR14LA134), Mar 7, 2014: Cessna 170B (N2252D), San Luis Obispo, CA, substantial damage. Probable cause: Corrosion of the bulkhead assembly in the left main landing gearbox area, which resulted in the structural failure of the bulkhead and the subsequent landing gear collapse.
- [NTSB CEN13CA289](https://openairdocs.org/ntsb/CEN13CA289), May 14, 2013: Cessna 172S (N947SP), Ankeny, IA, substantial damage. Probable cause: The student pilot's improper flare which resulted in a hard landing.
- [NTSB ANC08CA066](https://openairdocs.org/ntsb/ANC08CA066), May 11, 2008: de Havilland DHC-2 (N323KT), Talkeetna, AK, substantial damage. Probable cause: The pilot's inadvertent activation of the main landing gear brakes during the recovery from a bounced landing.
- [NTSB NYC79AA106](https://openairdocs.org/ntsb/NYC79AA106), Sep 17, 1979: Mcdonnell Douglas DC9 (CF-TLU), Boston, MA, substantial damage. Probable cause: a fatigue fracture of the aft cabin pressure bulkhead which resulted in a rapid decompression of the aircraft's cabin area. This fracture initiated from a crack below the aft bulkhead access door…

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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