# Airworthiness Directives; Lockheed Model L-1011 Series Airplanes Equipped With Rolls-Royce Model RB211-524 Series Engines
> **Rule** · Final rule. · Published 1997-07-03 · Effective 1997-08-07 · 62 FR 35951
## Document
- **Document number:** 97-17278
- **Category:** airworthiness
- **Manufacturer:** Lockheed Model L-1011 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 62 FR 35951
- **Publication date:** 1997-07-03
- **Effective date:** 1997-08-07
- **FAA docket:** Docket No. 97-NM-06-AD
## Abstract

This amendment supersedes 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 amendment requires that a new modification be installed in lieu of one of those previously required. This amendment 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 this 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.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1997/07/03/97-17278/airworthiness-directives-lockheed-model-l-1011-series-airplanes-equipped-with-rolls-royce-model)
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