# Proposed AD 99-NM-129-AD: Lockheed Model L-1011-385 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2005-15-01
- Products: Lockheed
- Product type: Aircraft
- Action: Supplemental notice of proposed rulemaking; reopening of comment period.
- Published: December 16, 2004, 69 FR 75282
- Comments due: January 10, 2005
- Became: [AD 2005-15-01](https://openairdocs.org/ad/2005-15-01)
- Docket: 99-NM-129-AD
- FR document: 04-27520
- Official PDF: https://openairdocs.org/files/sha256/4a/6e/4a6e132adffafbb54170555d9ee37c90b8260bee536c8b41547e700aefc6bf75 (from https://www.govinfo.gov/content/pkg/FR-2004-12-16/pdf/04-27520.pdf)
- Federal Register: https://www.federalregister.gov/documents/2004/12/16/04-27520/airworthiness-directives-lockheed-model-l-1011-385-series-airplanes
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/9964C493FEE9C70586256F6C005CF3E2.0001
- Page: https://openairdocs.org/proposed/99-NM-129-AD

## Summary

This document revises an earlier proposed airworthiness directive (AD), applicable to all Lockheed Model L-1011-385 series airplanes, that would have required repetitive inspections to detect corrosion or fatigue cracking of certain structural elements of the airplane; corrective actions if necessary; and incorporation of certain structural modifications. This new action revises the proposed rule by referencing a new service bulletin that, among other changes, corrects the effectivity and revises the modification threshold of various secondary service bulletins. The actions specified by this new proposed AD are intended to prevent corrosion or fatigue cracking of certain structural elements, which could result in reduced structural integrity of the airplane. This action is intended to address the identified unsafe condition.

## Notices in this docket

- Dec 9, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-31876, comments due Jan 24, 2000 (https://www.federalregister.gov/documents/1999/12/09/99-31876/airworthiness-directives-lockheed-model-l-1011-385-series-airplanes)
- Dec 16, 2004: Supplemental notice of proposed rulemaking; reopening of comment period., FR document 04-27520, comments due Jan 10, 2005 (https://www.federalregister.gov/documents/2004/12/16/04-27520/airworthiness-directives-lockheed-model-l-1011-385-series-airplanes)

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