# Proposed AD FAA-2010-0129: Airbus A318, A319, A320, A321 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-10-08
- Products: Airbus
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 23, 2010, 75 FR 8003
- Comments due: April 9, 2010
- Became: [AD 2010-10-08](https://openairdocs.org/ad/2010-10-08)
- Docket: FAA-2010-0129 (https://www.regulations.gov/docket/FAA-2010-0129, where comments are filed)
- Project: 2009-NM-245-AD
- FR document: 2010-3442
- Official PDF: https://openairdocs.org/files/sha256/55/f6/55f69a526c1f7e9889859cae5cc0b52548ada79effef52584e5da5987c051d6c (from https://www.govinfo.gov/content/pkg/FR-2010-02-23/pdf/2010-3442.pdf)
- Federal Register: https://www.federalregister.gov/documents/2010/02/23/2010-3442/airworthiness-directives-airbus-a318-a319-a320-a321-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6BD95889C13A21FD862576D30067927A.0001
- Page: https://openairdocs.org/proposed/FAA-2010-0129

## Summary

We propose to adopt a new airworthiness directive (AD) for the products listed above. This proposed AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as: Several occurrences of loss of the AC [alternating current] BUS 1 have been reported which led in some instances to the loss of the AC ESS [essential] BUS and DC [direct current] ESS BUS and connected systems. The affected systems include multiple flight deck Display Units (Primary Flight Display, Navigation Display and Upper Electronic Centralised Aircraft Monitoring display). The loss of multiple display units, if not corrected expediently during a high workload period, potentially affects the capability of the flight crew and could contribute to a loss of situational awareness and consequent control of the aeroplane, which would constitute anunsafe condition. The proposed AD would require actions that are intended to address the unsafe condition described in the MCAI.

## Notices in this docket

- Feb 23, 2010: Notice of proposed rulemaking (NPRM). (first notice), FR document 2010-3442, comments due Apr 9, 2010 (https://www.federalregister.gov/documents/2010/02/23/2010-3442/airworthiness-directives-airbus-a318-a319-a320-a321-series-airplanes)

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