# Proposed AD 97-NM-06-AD: Lockheed Model L-1011 Series Airplanes Equipped With Rolls-Royce Model RB.211-524 Series Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 97-14-07
- Action: Notice of proposed rulemaking (NPRM).
- Published: March 26, 1997, 62 FR 14363
- Comments due: May 5, 1997
- Became: [AD 97-14-07](https://openairdocs.org/ad/97-14-07)
- Docket: 97-NM-06-AD
- FR document: 97-7682
- Official PDF: https://openairdocs.org/files/sha256/ca/28/ca288e7fad11990b8bd4f6a028ce8aa9e4d44a6d16b5a483304f88dc88657dc2 (from https://www.govinfo.gov/content/pkg/FR-1997-03-26/pdf/97-7682.pdf)
- Federal Register: https://www.federalregister.gov/documents/1997/03/26/97-7682/airworthiness-directives-lockheed-model-l-1011-series-airplanes-equipped-with-rolls-royce-model
- Page: https://openairdocs.org/proposed/97-NM-06-AD

## Summary

This document proposes the supersedure of an existing airworthiness directive (AD), applicable to certain Lockheed Model L- 1011 series airplanes, that currently requires several modifications of the engine high speed gearboxes. This action would require that a new modification be installed in lieu of one of those previously required. This proposal is prompted by a report indicating that one of the currently required modifications is not completely effective because it can create interference problems between the fireloop and a fuel line. The actions specified by the proposed AD are intended to reduce the possibility of a fire in the high speed gear boxes, and to ensure that any fire which may occur is readily detected by the flight crew.

## Notices in this docket

- Mar 26, 1997: Notice of proposed rulemaking (NPRM). (first notice), FR document 97-7682, comments due May 5, 1997 (https://www.federalregister.gov/documents/1997/03/26/97-7682/airworthiness-directives-lockheed-model-l-1011-series-airplanes-equipped-with-rolls-royce-model)

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