# Airworthiness Directives; Boeing Model 747 Series Airplanes Equipped With Pratt & Whitney JT9D-3 and -7 Series Engines
> **Rule** · Final rule; correction. · Published 1998-04-15 · Effective 1998-02-02 · 63 FR 18307
## Document
- **Document number:** 98-9876
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 747 Series
- **Type:** Rule
- **Action:** Final rule; correction.
- **Citation:** 63 FR 18307
- **Publication date:** 1998-04-15
- **Effective date:** 1998-02-02
- **FAA docket:** Docket No. 97-NM-267-AD
## Abstract

This document corrects erroneous references that appeared in airworthiness directive (AD) 98-02-02 that was published in the Federal Register on January 16, 1998 (63 FR 2593). The erroneous references resulted in incorrect citations of AD numbers. That AD is applicable to certain Boeing Model 747 series airplanes. It supersedes an existing AD to continue to require repetitive inspections for discrepancies of the forward engine mount bulkhead of the nacelle strut, and corrective actions, if necessary. That AD also continues to provide for an optional terminating action for the repetitive inspections. For certain airplanes, the AD adds various inspections to detect discrepancies in the forward engine mount bulkhead and chord, and in the forward lower spar web, and corrective actions, if necessary. The AD also adds an additional optional terminating action for the repetitive inspections.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/04/15/98-9876/airworthiness-directives-boeing-model-747-series-airplanes-equipped-with-pratt-and-whitney-jt9d-3)
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