# Proposed AD 98-NM-35-AD: Lockheed Model L-1011-385 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-21-01
- Action: Notice of proposed rulemaking (NPRM).
- Published: June 25, 1999, 64 FR 34170
- Comments due: August 9, 1999
- Became: [AD 2000-21-01](https://openairdocs.org/ad/2000-21-01)
- Docket: 98-NM-35-AD
- FR document: 99-16157
- Official PDF: https://openairdocs.org/files/sha256/f3/37/f33732f5d48e8282f1f2c1ffc21551d817e174c66a0b63408e7b040ee8b5a3c4 (from https://www.govinfo.gov/content/pkg/FR-1999-06-25/pdf/99-16157.pdf)
- Federal Register: https://www.federalregister.gov/documents/1999/06/25/99-16157/airworthiness-directives-lockheed-model-l-1011-385-series-airplanes
- Page: https://openairdocs.org/proposed/98-NM-35-AD

## Summary

This document proposes the adoption of a new airworthiness directive (AD) that is applicable to all Lockheed Model L-1011-385 series airplanes. This proposal would require repetitive inspections to detect corrosion or fatigue cracking of certain structural elements of the airplane; corrective action, if necessary; and incorporation of certain structural modifications. This proposal is prompted by new recommendations related to incidents of fatigue cracking and corrosion in transport category airplanes that are approaching or have exceeded their economic design goal. The actions specified by the proposed AD are intended to prevent corrosion or fatigue cracking of certain structural elements, which could result in reduced structural integrity of the airplane.

## Notices in this docket

- Jun 25, 1999: Notice of proposed rulemaking (NPRM). (first notice), FR document 99-16157, comments due Aug 9, 1999 (https://www.federalregister.gov/documents/1999/06/25/99-16157/airworthiness-directives-lockheed-model-l-1011-385-series-airplanes)

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