# AC power distribution system

- Type: NTSB finding subsection
- Path: [Aircraft](https://openairdocs.org/ntsb-findings/01) › [Aircraft systems](https://openairdocs.org/ntsb-findings/0102) › [Electrical power system](https://openairdocs.org/ntsb-findings/010224) › AC power distribution system
- NTSB code: 01022450
- Cases: 4
- In the probable cause: 4
- Fatal cases: 0
- All cases: https://openairdocs.org/ntsb-findings/01022450/cases.md
- Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01022450/cases.md?cause=1
- Page: https://openairdocs.org/ntsb-findings/01022450

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

- 2008: 1 / 1
- 2009: 1 / 1
- 2016: 1 / 1
- 2018: 1 / 1

## Defining events in these cases

- [Electrical system malf/failure](https://openairdocs.org/ntsb-events/332): 2 cases
- [Fire/smoke (non-impact)](https://openairdocs.org/ntsb-events/150): 1 cases
- [Landing gear collapse](https://openairdocs.org/ntsb-events/094): 1 cases

## Aircraft models (registry)

- [Swearingen SA227-TT](https://openairdocs.org/model/swearingen-sa227-tt): 1 cases
- [Airbus Industrie A320-232](https://openairdocs.org/model/airbus-industrie-a320-232): 1 cases
- [Cessna R182](https://openairdocs.org/model/cessna-r182): 1 cases
- [Canadair CL-600-2B19](https://openairdocs.org/model/canadair-cl-600-2b19): 1 cases

## Other findings in the same cases

- [Nose/tail landing gear](https://openairdocs.org/ntsb-findings/01023220) (Aircraft): 1 cases
- [Main landing gear](https://openairdocs.org/ntsb-findings/01023210) (Aircraft): 1 cases

## Newest cases

- [NTSB CEN18LA086](https://openairdocs.org/ntsb/CEN18LA086), Jan 19, 2018: Swearingen SA227 TT (N6UP), Houston, TX, substantial damage. Probable cause: The failure of the left starter relay during engine start, which resulted in a loss of electrical and battery power during the flight and led to a forced landing with the nose landing gear not fully…
- [NTSB ERA16LA190](https://openairdocs.org/ntsb/ERA16LA190), May 16, 2016: Cessna R182 (N9077C), Lake City, FL, substantial damage. Probable cause: Internal failure of the main electrical contactor, which resulted in a complete loss of electrical power and an inability to extend the landing gear through normal means.
- [NTSB DCA09FA033](https://openairdocs.org/ntsb/DCA09FA033), Feb 28, 2009: Bombardier CRJ (N830AS), Tallahassee, FL, substantial damage. Probable cause: An electrical anomaly in the top portion of the JB-1 junction box resulting in ignition of adjacent combustible materials, including insulation blankets, and a flexible oxygen line.
- [NTSB DCA08IA033](https://openairdocs.org/ntsb/DCA08IA033), Jan 25, 2008: Airbus A320 (N462UA), Newark, NJ, incident, no damage. Probable cause: a fault in the airplane's AC 1 electrical bus that caused a number of other electrical busses on the aircraft to lose 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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