# Proposed AD FAA-2011-0919: Lockheed Martin Corporation/Lockheed Martin Aeronautics Company Model L-1011 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2011-27-02
- Products: Lockheed Martin Corporation/Lockheed Martin Aeronautics
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: September 21, 2011, 76 FR 58416
- Comments due: November 7, 2011
- Became: [AD 2011-27-02](https://openairdocs.org/ad/2011-27-02)
- Docket: FAA-2011-0919 (https://www.regulations.gov/docket/FAA-2011-0919, where comments are filed)
- Project: 2010-NM-088-AD
- FR document: 2011-24270
- Official PDF: https://openairdocs.org/files/sha256/41/2b/412b319a47015a839830916ed5554a624b2f44eccb362d9b55e8a7b86624877d (from https://www.govinfo.gov/content/pkg/FR-2011-09-21/pdf/2011-24270.pdf)
- Federal Register: https://www.federalregister.gov/documents/2011/09/21/2011-24270/airworthiness-directives-lockheed-martin-corporationlockheed-martin-aeronautics-company-model-l-1011
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/4280F509BE9CC40C8625791200582580.0001
- Page: https://openairdocs.org/proposed/FAA-2011-0919

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Model L-1011 series airplanes. This proposed AD would require repetitive inspections for cracking of the wing rear spar and upper surface zones, and repair if necessary. This proposed AD results from a damage tolerance analysis conducted by the manufacturer indicating that fatigue cracking could occur in those areas. We are proposing this AD to detect and correct such fatigue cracking, which could result in cracking that grows large enough to reduce the wing strength below certificated requirements and possibly cause fracture of the rear spar, resulting in extensive damage to the wing and possible fuel leaks.

## Notices in this docket

- Sep 21, 2011: Notice of proposed rulemaking (NPRM). (first notice), FR document 2011-24270, comments due Nov 7, 2011 (https://www.federalregister.gov/documents/2011/09/21/2011-24270/airworthiness-directives-lockheed-martin-corporationlockheed-martin-aeronautics-company-model-l-1011)

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