# Spars/ribs (on elevator)

- Type: NTSB finding subsection
- Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft structures](https://openairdocs.org/ntsb-findings/0103) › [Empennage structure](https://openairdocs.org/ntsb-findings/010355) › Spars/ribs (on elevator)
- NTSB code: 01035521
- Cases: 1
- In the probable cause: 1
- Fatal cases: 0
- All cases: https://openairdocs.org/ntsb-findings/01035521/cases.md
- Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01035521/cases.md?cause=1
- Page: https://openairdocs.org/ntsb-findings/01035521

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

- 2011: 1 / 1

## Defining events in these cases

- [Aircraft structural failure](https://openairdocs.org/ntsb-events/337): 1 cases

## Aircraft models (registry)

- [Piper PA-31-350](https://openairdocs.org/model/piper-pa-31-350): 1 cases

## Other findings in the same cases

- [Not determined, general](https://openairdocs.org/ntsb-findings/05000000) (Not determined): 1 cases

## Newest cases

- [NTSB ERA11LA141](https://openairdocs.org/ntsb/ERA11LA141), Feb 11, 2011: Piper PA-31-350 (N31NW), Baltimore, MD, substantial damage. Probable cause: An in-flight overload failure of the left elevator inboard balance weight rib for undetermined reasons.

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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