# Airworthiness Directives; CFM International CFM56-7B Series Turbofan Engines
> **Rule** · Final rule, request for comments. · Published 1998-09-16 · Effective 1998-10-01 · 63 FR 49423
## Document
- **Document number:** 98-24644
- **Category:** airworthiness
- **Manufacturer:** CFM International CFM56-7B Series Turbofan
- **Type:** Rule
- **Action:** Final rule, request for comments.
- **Citation:** 63 FR 49423
- **Publication date:** 1998-09-16
- **Effective date:** 1998-10-01
- **FAA docket:** Docket No. 98-ANE-50-AD
## Abstract

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) T98-14-51 that was sent previously to all known U.S. owners and operators of CFM International CFM56-7B series turbofan engines by individual telegrams. This AD requires checks of the Accessory Gearbox (AGB)/Transfer Gearbox (TGB) Magnetic Chip Detector (MCD) for abnormal magnetic particles that indicate a pending starter gearshaft failure, and, removal from service of suspect starter gearshafts and replacement with serviceable parts. This amendment is prompted by reports of 2 inflight engine shutdowns due to uncontained failures of the AGB starter gearshafts. The actions specified by this AD are intended to prevent a dual inflight engine shutdown event, which could result in a forced landing and loss of the aircraft.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/09/16/98-24644/airworthiness-directives-cfm-international-cfm56-7b-series-turbofan-engines)
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