# Proposed AD FAA-2005-20796: Airbus Model A300 B2 and A300 B4 Series Airplanes; Model A300 B4-600, B4-600R and F4-600R Series Airplanes, and Model A300 C4-605R Variant F Airplanes (Collectively Called A300-600); and Model A310 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-20-06
- Products: Airbus
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 4, 2005, 70 FR 16981
- Comments due: May 4, 2005
- Became: [AD 2005-20-06](https://openairdocs.org/ad/2005-20-06)
- Docket: FAA-2005-20796 (https://www.regulations.gov/docket/FAA-2005-20796, where comments are filed)
- Project: 2004-NM-160-AD
- FR document: 05-6578
- Official PDF: https://openairdocs.org/files/sha256/39/a7/39a77c401afc6e9aa2715804a6d73cd9b4ef9637305253e6619c239a42f197a2 (from https://www.govinfo.gov/content/pkg/FR-2005-04-04/pdf/05-6578.pdf)
- Federal Register: https://www.federalregister.gov/documents/2005/04/04/05-6578/airworthiness-directives-airbus-model-a300-b2-and-a300-b4-series-airplanes-model-a300-b4-600-b4-600r
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/08A04440F2A968A086256FD9005553AD.0001
- Page: https://openairdocs.org/proposed/FAA-2005-20796

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for all the Airbus models identified above. This proposed AD would require modifying the electrical power supply logic for the integral lighting of the standby horizon indicator in the cockpit; accomplishing repetitive operational tests of the integral lighting logic system, and corrective action if necessary. This proposed AD is prompted by a report of temporary loss of six cathode ray tube flight displays and the integral lighting of the standby horizon indicator in the cockpit during takeoff, due to failure of the normal electrical power circuit. We are proposing this AD to prevent loss of that integral lighting due to such failure, which could result in inability of the pilot to read the backup attitude information during takeoff, and possible deviation from the intended flight path.

## Notices in this docket

- Apr 4, 2005: Notice of proposed rulemaking (NPRM). (first notice), FR document 05-6578, comments due May 4, 2005 (https://www.federalregister.gov/documents/2005/04/04/05-6578/airworthiness-directives-airbus-model-a300-b2-and-a300-b4-series-airplanes-model-a300-b4-600-b4-600r)

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