# Proposed AD FAA-2013-0094: Airbus Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2013-17-09
- Products: Airbus
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 26, 2013, 78 FR 12988
- Comments due: April 12, 2013
- Became: [AD 2013-17-09](https://openairdocs.org/ad/2013-17-09)
- Docket: FAA-2013-0094 (https://www.regulations.gov/docket/FAA-2013-0094, where comments are filed)
- Project: 2012-NM-160-AD
- FR document: 2013-04339
- Official PDF: https://openairdocs.org/files/sha256/fe/6c/fe6cd2ef23818e46736b449ba929b8c40d7e7da442f783a31f60c808e653e2f7 (from https://www.govinfo.gov/content/pkg/FR-2013-02-26/pdf/2013-04339.pdf)
- Federal Register: https://www.federalregister.gov/documents/2013/02/26/2013-04339/airworthiness-directives-airbus-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/83E8B7744B87430286257B1E00502884.0001
- Page: https://openairdocs.org/proposed/FAA-2013-0094

## Summary

We propose to adopt a new airworthiness directive (AD) for all Airbus Model A318, A319, A320, and A321 series airplanes. This proposed AD was prompted by reports that certain trimmable horizontal stabilizer actuators (THSA) were found with corrosion that affected the ballscrew lower splines between the tie-bar and screw-jack. This proposed AD would require repetitive inspections of the THSA; ballscrew integrity tests, if necessary; and replacement of affected THSAs. We are proposing this AD to detect and correct corrosion in the ballscrew lower splines, which, if the ballscrew ruptured, could lead to transmission of THSA torque loads from the ballscrew to the tie-bar, prompting THSA blowback, and possible loss of control of the airplane.

## Notices in this docket

- Feb 26, 2013: Notice of proposed rulemaking (NPRM). (first notice), FR document 2013-04339, comments due Apr 12, 2013 (https://www.federalregister.gov/documents/2013/02/26/2013-04339/airworthiness-directives-airbus-airplanes)

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