# Airworthiness Directives; Rolls-Royce Deutschland Ltd & Co KG (Type Certificate Previously Held by Rolls-Royce plc) Turbofan Engines
> **Rule** · Final rule; request for comments. · Published 2020-06-03 · Effective 2020-06-18 · 85 FR 34088
## Document
- **Document number:** 2020-11983
- **Category:** airworthiness
- **Manufacturer:** Rolls-Royce Deutschland Ltd & Co KG (Type Certificate Previously Held by Rolls-Royce plc) Turbofan
- **Type:** Rule
- **Action:** Final rule; request for comments.
- **Citation:** 85 FR 34088
- **Publication date:** 2020-06-03
- **Effective date:** 2020-06-18
- **FAA docket:** Docket No. FAA-2020-0547
## Abstract

The FAA is adopting a new airworthiness directive (AD) for all Rolls-Royce Deutschland Ltd & Co KG Trent XWB-97 model turbofan engines. This AD requires updating electronic engine control (EEC) software. This AD was prompted by the manufacturer's finding that a P30 (air pressure) sense line could become partially blocked with a mixture of ice and water, which would cause a time-lag in the P30 signal, interfering with the fuel flow limit calculations. The FAA is issuing this AD to address the unsafe condition on these products.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2020/06/03/2020-11983/airworthiness-directives-rolls-royce-deutschland-ltd-and-co-kg-type-certificate-previously-held-by)
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