# AC generation 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 generation system
- NTSB code: 01022420
- Cases: 4
- In the probable cause: 3
- Fatal cases: 1
- All cases: https://openairdocs.org/ntsb-findings/01022420/cases.md
- Cases with it in the probable cause: https://openairdocs.org/ntsb-findings/01022420/cases.md?cause=1
- Page: https://openairdocs.org/ntsb-findings/01022420

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

- 2009: 1 / 1
- 2013: 1 / 1
- 2020: 0 / 1
- 2023: 1 / 1

## Defining events in these cases

- [Electrical system malf/failure](https://openairdocs.org/ntsb-events/332): 2 cases
- [Aerodynamic stall/spin](https://openairdocs.org/ntsb-events/241): 1 cases

## Aircraft models (registry)

- [Airbus A319-132](https://openairdocs.org/model/airbus-a319-132): 1 cases
- [Airbus A320-232](https://openairdocs.org/model/airbus-a320-232): 1 cases
- [Beech E35](https://openairdocs.org/model/beech-e35): 1 cases

## Other findings in the same cases

- [Aircraft control](https://openairdocs.org/ntsb-findings/02063040) (Personnel issues): 1 cases
- [Monitoring equip/instruments](https://openairdocs.org/ntsb-findings/02021525) (Personnel issues): 1 cases
- [Angle of attack](https://openairdocs.org/ntsb-findings/01062042) (Aircraft): 1 cases

## Newest cases

- [NTSB ENG23LA033](https://openairdocs.org/ntsb/ENG23LA033), Aug 3, 2023: Airbus A320 (N649JB), Jacksonville, FL, incident, no damage. Probable cause: The loss of both Integrated Drive Generators (IDG) due to worn fixed cylinder block bores, which caused the IDGs to be tripped offline and caused the airplane to enter an emergency electrical…
- [NTSB ENG20LA016](https://openairdocs.org/ntsb/ENG20LA016), Feb 15, 2020: Airbus A319 (N521NK), Sacramento, CA, incident, no damage. Probable cause: A worn component within each engine integrated drive generator (IDG) resulted in the loss of electrical power supplied to several flight deck displays and systems while on approach to landing. The…
- [NTSB WPR13FA368](https://openairdocs.org/ntsb/WPR13FA368), Aug 12, 2013: Beech E35 (N3226C), West Yellowstone, MT, substantial damage, 1 fatal. Probable cause: The pilot's failure to maintain airplane control while aligning the airplane with the runway for landing, which resulted in the airplane exceeding its critical angle of attack and experiencing an…
- [NTSB ENG10RA017](https://openairdocs.org/ntsb/ENG10RA017), Dec 21, 2009: Bombardier DHC-8 (G-JEDI), London, United Kingdom, incident, minor damage

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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