# Airworthiness Directives; Boeing Model 727-100 Series Airplanes Modified in Accordance With Supplemental Type Certificate (STC) SA8472SW
> **Rule** · Final rule; request for comments. · Published 1997-11-04 · Effective 1997-11-19 · 62 FR 59565
## Document
- **Document number:** 97-29114
- **Category:** airworthiness
- **Manufacturer:** Boeing Model 727-100 Series
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 62 FR 59565
- **Publication date:** 1997-11-04
- **Effective date:** 1997-11-19
- **FAA docket:** Docket No. 97-NM-268-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to certain Boeing Model 727-100 series airplanes. This action requires a revision to the Airplane Flight Manual (AFM) to prohibit stabilized operation between 60 and 75 percent N1 speed during ground operations in reverse or forward thrust. This amendment is prompted by a report that, during preparation for takeoff, a transport category airplane equipped with Rolls-Royce Tay 650-15 engines sustained an engine fan blade failure, followed by an engine fire. The actions specified in this AD are intended to prevent uncontained failure of engine fan blades due to high cycle fatigue cracking, which could result in loss of thrust from the affected engine and secondary damage to the airplane and/or fire.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1997/11/04/97-29114/airworthiness-directives-boeing-model-727-100-series-airplanes-modified-in-accordance-with)
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