# Proposed AD 96-NM-257-AD: Lockheed Model L-1011-385 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-10-14
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 1, 1997, 62 FR 15429
- Comments due: May 9, 1997
- Became: [AD 98-10-14](https://openairdocs.org/ad/98-10-14)
- Docket: 96-NM-257-AD
- FR document: 97-8125
- Official PDF: https://openairdocs.org/files/sha256/00/eb/00ebef02af9fa6092351ecb640853d1c8f5b9b16b07f6f125f7b8c39d3b375ae (from https://www.govinfo.gov/content/pkg/FR-1997-04-01/pdf/97-8125.pdf)
- Federal Register: https://www.federalregister.gov/documents/1997/04/01/97-8125/airworthiness-directives-lockheed-model-l-1011-385-series-airplanes
- Page: https://openairdocs.org/proposed/96-NM-257-AD

## Summary

This document proposes the supersedure of an existing airworthiness directive (AD), applicable to all Lockheed Model L-1011- 385 series airplanes, that currently requires various types of inspections to detect fatigue cracking of certain areas of the rear spar caps, web, skin, and certain fastener holes; and repair or modification, if necessary. This action would reduce the repetitive inspection interval for all of the currently required inspections, except for the x-ray inspections. It also would revise the terminating modification provision for some airplanes. This proposal is prompted by reports of cracks found during the currently-required inspections, which had progressed to lengths greater than predicted. The actions specified by the proposed AD are intended to ensure that fatigue cracking is detected and corrected in a timely manner before it can lead to rupture of the rear spar, extensive damage to the wing, and spillage of fuel.

## Notices in this docket

- Apr 1, 1997: Notice of proposed rulemaking (NPRM). (first notice), FR document 97-8125, comments due May 9, 1997 (https://www.federalregister.gov/documents/1997/04/01/97-8125/airworthiness-directives-lockheed-model-l-1011-385-series-airplanes)

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