# Airworthiness Directives; Rolls-Royce plc RB211-535E4 and -535E4- B Series Turbofan Engines
> **Rule** · Final rule. · Published 1997-02-03 · Effective 1997-04-04 · 62 FR 4899
## Document
- **Document number:** 97-1701
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce plc RB211-535E4 and -535E4- B Series Turbofan
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 62 FR 4899
- **Publication date:** 1997-02-03
- **Effective date:** 1997-04-04
- **FAA docket:** Docket No. 96-ANE-09
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to Rolls-Royce plc RB211-535E4 and -535E4-B series turbofan engines, that requires installation of an improved fuel flow governor that incorporates revised minimum compressor discharge P4 stop settings. This amendment is prompted by reports of engine rundowns during low idle descent during icing conditions. The actions specified by this AD are intended to prevent compressor stall and subsequent engine rundown on one or both engines.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1997/02/03/97-1701/airworthiness-directives-rolls-royce-plc-rb211-535e4-and--535e4--b-series-turbofan-engines)
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