# Proposed AD FAA-2012-0808: Airbus Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-05-08
- Products: Airbus
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: August 14, 2012, 77 FR 48469
- Comments due: September 28, 2012
- Became: [AD 2013-05-08](https://openairdocs.org/ad/2013-05-08)
- Docket: FAA-2012-0808 (https://www.regulations.gov/docket/FAA-2012-0808, where comments are filed)
- Project: 2010-NM-170-AD
- FR document: 2012-19887
- Official PDF: https://openairdocs.org/files/sha256/68/53/6853d6b77fd81c5e0bd67ac8e071a9efac3bd55e917336f42231b3999ee77f72 (from https://www.govinfo.gov/content/pkg/FR-2012-08-14/pdf/2012-19887.pdf)
- Federal Register: https://www.federalregister.gov/documents/2012/08/14/2012-19887/airworthiness-directives-airbus-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/E74EE2FD4FE20B9586257A5A0048EB14.0001
- Page: https://openairdocs.org/proposed/FAA-2012-0808

## Summary

We propose to adopt a new airworthiness directive (AD) for Airbus Model A330-200 and A330-300 series airplanes, and Model A340-200 and A340-300 series airplanes. This proposed AD was prompted by reports of an elevator blocked in the down position due to two independent failures; first, the inability of a servo control to switch to active mode because it was not detected by a flight control computer, and second, an internal hydraulic leak due to the deterioration of an O- ring seal on a solenoid. This proposed AD would require, depending on airplane configuration, modifying three flight control primary computers (FCPCs); modifying two flight control secondary computers (FCSCs); revising the airplane flight manual (AFM) to include certain information; replacing certain O-rings; and checking part number, and replacing certain O-ring seals if needed. We are proposing this AD to detect and correct O-rings with incorrect part number whose deterioration could lead to improper sealingof solenoid valves, and to correct FCPC and FCSC software to allow better control of elevator positioning; both conditions, if not corrected, could lead to the loss of elevator control on takeoff, and potentially reduce the controllability of the airplane.

## Notices in this docket

- Aug 14, 2012: Notice of proposed rulemaking (NPRM). (first notice), FR document 2012-19887, comments due Sep 28, 2012 (https://www.federalregister.gov/documents/2012/08/14/2012-19887/airworthiness-directives-airbus-airplanes)

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