# Airworthiness Directives; Lockheed Model L-1011-385 Series Airplanes
> **Rule** · Final rule. · Published 1999-04-14 · Effective 1999-05-19 · 64 FR 18324
## Document
- **Document number:** 99-9130
- **Category:** airworthiness
- **Manufacturer:** Lockheed Model L-1011-385 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 64 FR 18324
- **Publication date:** 1999-04-14
- **Effective date:** 1999-05-19
- **FAA docket:** Docket No. 97-NM-315-AD
## Abstract

This amendment supersedes an existing airworthiness directive (AD), applicable to all Lockheed Model L-1011-385 series airplanes, that currently requires a one-time inspection to detect cracking of the bulkhead at fuselage station (FS) 1363 at butt line 42.5, and repair or additional inspections, if necessary. This amendment adds repetitive inspections to detect cracking of the bulkhead web and bulkhead cap (frame cap) at FS 1363, and repair, if necessary. This amendment is prompted by reports that additional, more extensive, fatigue cracking was found in the bulkhead web and cap. The actions specified by this AD are intended to detect and correct cracking of the bulkhead web and cap, which could result in reduced structural integrity of the fuselage.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/04/14/99-9130/airworthiness-directives-lockheed-model-l-1011-385-series-airplanes)
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