# Airworthiness Directives; BMW Rolls-Royce GmbH Models BR700-710A1-10 and BR700-710A2-20 Turbofan Engines.
> **Rule** · Final rule; request for comments. · Published 2001-01-16 · Effective 2001-01-31 · 66 FR 3448
## Document
- **Document number:** 01-917
- **Category:** airworthiness
- **Manufacturer:** BMW Rolls-Royce GmbH Models BR700-710A1-10 and BR700-710A2-20 Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 66 FR 3448
- **Publication date:** 2001-01-16
- **Effective date:** 2001-01-31
- **FAA docket:** Docket No. 2000-NE-44-AD
## Abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to BMW Rolls-Royce (RR) GmbH models BR700-710A1-10 and BR700-710A2-20 turbofan engines with oil filter differential pressure switch part number (P/N) 21SN04-419 or P/N 21SN04-431 installed. This action requires inspections of oil filter differential pressure switches, and replacement if necessary, in accordance with Rolls-Royce Service Bulletin No. SB-BR700-79-900215, Revision 2, dated August 2, 2000. This amendment is prompted by a report of severe engine oil loss, caused by oil leakage from a defective oil filter differential pressure switch. The actions specified in this AD are intended to prevent defective oil filter differential pressure switches from causing severe engine oil loss, resulting in in-flight shutdowns.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2001/01/16/01-917/airworthiness-directives-bmw-rolls-royce-gmbh-models-br700-710a1-10-and-br700-710a2-20-turbofan)
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