# Airworthiness Directives; Boeing Model 747-100 Series Airplanes
> **Rule** · Final rule. · Published 1998-07-23 · Effective 1998-08-27 · 63 FR 39487
## Document
- **Document number:** 98-19455
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 747-100 Series
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 63 FR 39487
- **Publication date:** 1998-07-23
- **Effective date:** 1998-08-27
- **FAA docket:** Docket No. 97-NM-82-AD
## Abstract

This amendment supersedes an existing airworthiness directive (AD), applicable to certain Boeing Model 747-100 series airplanes, that currently requires repetitive inspections to detect cracking of the wing front spar web above engine numbers 2 and 3, and to detect cracked or broken fasteners in the web; and repair, if necessary. That AD also provides an optional terminating action for the repetitive inspections. This amendment requires various improved inspections. This amendment is prompted by a report indicating that the existing inspections do not adequately detect vertical cracks. The actions specified by this AD are intended to prevent fuel leakage onto an engine and a resultant fire due to cracked or broken fasteners in the wing front spar.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/07/23/98-19455/airworthiness-directives-boeing-model-747-100-series-airplanes)
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