# Proposed AD FAA-2015-0493: Lockheed Martin Corporation/Lockheed Martin Aeronautics Company Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2015-20-05
- Products: Lockheed Martin
- Product type: Aircraft
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 24, 2015, 80 FR 15525
- Comments due: May 8, 2015
- Became: [AD 2015-20-05](https://openairdocs.org/ad/2015-20-05)
- Docket: FAA-2015-0493 (https://www.regulations.gov/docket/FAA-2015-0493, where comments are filed)
- Project: 2014-NM-184-AD
- FR document: 2015-06576
- Official PDF: https://openairdocs.org/files/sha256/5a/05/5a05594e4d3377ffcce7dd52dd75bb9167a545f9a5926af31c5c09161a1c3af1 (from https://www.govinfo.gov/content/pkg/FR-2015-03-24/pdf/2015-06576.pdf)
- Federal Register: https://www.federalregister.gov/documents/2015/03/24/2015-06576/airworthiness-directives-lockheed-martin-corporationlockheed-martin-aeronautics-company-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D71F8A8BF976CB0F86257E12004A2547.0001
- Page: https://openairdocs.org/proposed/FAA-2015-0493

## Summary

We propose to adopt a new airworthiness directive (AD) for certain Lockheed Martin Corporation/Lockheed Martin Aeronautics Company Model 188 series airplanes. This proposed AD was prompted by an evaluation by the design approval holder (DAH) indicating that the upper and lower wing skin planks at the attachment of the main landing gear (MLG) ribs at certain wing-stations are subject to widespread fatigue damage (WFD). This proposed AD would require an inspection (for cracking) and modification of the chordwise fastener rows of the upper and lower wing planks at the attachments to the MLG ribs at certain wing-stations. We are proposing this AD to prevent fatigue cracking of the upper and lower wing skin planks at the attachment of the MLG ribs, which could result in failure of the wing.

## Notices in this docket

- Mar 24, 2015: Notice of proposed rulemaking (NPRM). (first notice), FR document 2015-06576, comments due May 8, 2015 (https://www.federalregister.gov/documents/2015/03/24/2015-06576/airworthiness-directives-lockheed-martin-corporationlockheed-martin-aeronautics-company-airplanes)

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