# Proposed AD 97-NM-82-AD: Boeing Model 747-100 Series Airplanes

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 98-15-21
- Action: Notice of proposed rulemaking (NPRM).
- Published: April 14, 1998, 63 FR 18167
- Comments due: May 29, 1998
- Became: [AD 98-15-21](https://openairdocs.org/ad/98-15-21)
- Docket: 97-NM-82-AD
- FR document: 98-9752
- Official PDF: https://openairdocs.org/files/sha256/13/3d/133da4c93c1ce847bbd0f8ff2a7139baf363e469a77de37d6287b83e8e33e325 (from https://www.govinfo.gov/content/pkg/FR-1998-04-14/pdf/98-9752.pdf)
- Federal Register: https://www.federalregister.gov/documents/1998/04/14/98-9752/airworthiness-directives-boeing-model-747-100-series-airplanes
- Page: https://openairdocs.org/proposed/97-NM-82-AD

## Summary

This document proposes the supersedure of 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 proposal would require various improved inspections. This proposal is prompted by a report indicating that the existing inspections do not adequately detect vertical cracks. The actions specified by the proposed 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.

## Notices in this docket

- Apr 14, 1998: Notice of proposed rulemaking (NPRM). (first notice), FR document 98-9752, comments due May 29, 1998 (https://www.federalregister.gov/documents/1998/04/14/98-9752/airworthiness-directives-boeing-model-747-100-series-airplanes)

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