# Airworthiness Directives; Rolls-Royce Limited, Bristol Engines Division and Rolls-Royce (1971) Limited, Bristol Engines Division Viper Series Turbojet Engines
> **Rule** · Final rule. · Published 1998-12-14 · Effective 1999-02-12 · 63 FR 68674
## Document
- **Document number:** 98-32800
- **Category:** airworthiness
- **Type:** Rule
- **Action:** Final rule.
- **Citation:** 63 FR 68674
- **Publication date:** 1998-12-14
- **Effective date:** 1999-02-12
- **FAA docket:** Docket No. 98-ANE-06-AD
## Abstract

This amendment adopts a new airworthiness directive (AD), applicable to Rolls-Royce Limited, Bristol Engines Division and Rolls- Royce (1971) Limited, Bristol Engines Division, Viper series turbojet engines, that requires a one-time visual inspection of the barometric flow control unit (BFCU) augmentor and bypass valve joint washer for joint washer integrity, and replacement, if necessary, with serviceable parts. This amendment is prompted by a report of a high pressure fuel leak at the BFCU augmentor and bypass valve assembly joint, washer interface. The actions specified by this AD are intended to prevent a high pressure fuel leak, which could result in an engine nacelle fire and damage to the aircraft.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/1998/12/14/98-32800/airworthiness-directives-rolls-royce-limited-bristol-engines-division-and-rolls-royce-1971-limited)
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