# Proposed AD 98-NM-311-AD: Lockheed Model L-1011-385 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2000-10-20
- Action: Notice of proposed rulemaking (NPRM).
- Published: February 16, 2000, 65 FR 7801
- Comments due: April 3, 2000
- Became: [AD 2000-10-20](https://openairdocs.org/ad/2000-10-20)
- Docket: 98-NM-311-AD
- FR document: 00-3689
- Official PDF: https://openairdocs.org/files/sha256/61/d0/61d05bd7eb1246afdaebf474a2d704615ef9691ee3f6b5ddcfbd4f7e3529d357 (from https://www.govinfo.gov/content/pkg/FR-2000-02-16/pdf/00-3689.pdf)
- Federal Register: https://www.federalregister.gov/documents/2000/02/16/00-3689/airworthiness-directives-lockheed-model-l-1011-385-series-airplanes
- Page: https://openairdocs.org/proposed/98-NM-311-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 cracking of the fuselage skin in the areas of the left- and right-hand stringerless sidewall window belts, and repair, if necessary. This proposal is prompted by reports of fatigue cracks found in the fuselage skin where the skin thickness steps from 0.40 to 0.23 inch. The actions specified by the proposed AD are intended to detect and correct cracking of the fuselage skin, which could result in reduced structural integrity of the airplane.

## Notices in this docket

- Feb 16, 2000: Notice of proposed rulemaking (NPRM). (first notice), FR document 00-3689, comments due Apr 3, 2000 (https://www.federalregister.gov/documents/2000/02/16/00-3689/airworthiness-directives-lockheed-model-l-1011-385-series-airplanes)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.