# Airworthiness Directives; Boeing Model 747-400 Series Airplanes
> **Rule** · Final rule; request for comments. · Published 1999-08-09 · Effective 1999-08-24 · 64 FR 43053
## Document
- **Document number:** 99-20059
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 747-400 Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 64 FR 43053
- **Publication date:** 1999-08-09
- **Effective date:** 1999-08-24
- **FAA docket:** Docket No. 99-NM-61-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747-400 series airplanes. This action requires repetitive inspections of the E-42 satellite communications (SATCOM) rack and fuselage (supporting) structure to detect fatigue cracking of the area surrounding the fastener holes, and to detect broken or missing fasteners; and corrective actions, if necessary. This amendment is prompted by reports indicating that fatigue cracking and broken and/or missing fasteners were found on the E-42 SATCOM equipment rack structure that attaches to the fuselage structure. The actions specified in this AD are intended to detect and repair fatigue cracking of the E-42 SATCOM rack and its supporting structure, which could result in the SATCOM equipment falling from the rack, loss of SATCOM capabilities, injury to passengers, and reduced controllability of the airplane.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1999/08/09/99-20059/airworthiness-directives-boeing-model-747-400-series-airplanes)
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