# Federal Register #2026-21326

FAA airworthiness directive for Boeing 787 fan cowls on aircraft with Rolls-Royce Trent 1000 engines

**Buyer:** Federal Aviation Administration (FAA), U.S. Department of Transportation
**Posted:** October 19, 2026
**Identifier:** 2026-21326

The FAA issued an airworthiness directive for certain Boeing 787 aircraft with specified Rolls-Royce Deutschland Trent 1000 engines.
- **Government buyer:** U.S. Department of Transportation, Federal Aviation Administration (FAA), AIR-520 Continued Operational Safety Branch.
- **OEMs:** **Boeing** (787 aircraft and referenced service material) and **Rolls-Royce Deutschland** (Trent 1000 engines).
- **Aircraft and affected components:** Certain Boeing 787-8, 787-9, and 787-10 airplanes; right-engine left fan cowls with part numbers 725Z2300-307, 725Z2300-305, and 725Z2300-5003.
- **Required actions:** Operators must check maintenance records or inspect the right engine to identify the fan-cowl part number, then complete applicable actions, including modification or replacement. Installation of the identified parts is restricted on applicable airplanes where they are not already installed.
- **Safety rationale:** The directive addresses the risk of debris from one engine damaging components in the opposite engine, potentially causing an in-flight shutdown of both engines.
- **Procurement status:** This is a regulatory safety action, not a solicitation to purchase products or services; quantities and contract value are not specified.

### Description

The FAA is adopting a final airworthiness directive for certain Boeing 787-8, 787-9, and 787-10 airplanes equipped with specified Rolls Royce Trent 1000 engines. The directive requires a maintenance records check or inspection of the right engine to identify the left fan cowl part number, followed by applicable on-condition actions, including modifying or replacing the fan cowl. It addresses a safety risk involving insufficient protection from possible cross-engine debris, which could damage right-engine systems and lead to an in-flight dual-engine shutdown. The AD is effective November 23, 2026.

[View original listing](https://www.federalregister.gov/documents/2026/10/19/2026-21326/airworthiness-directives-the-boeing-company-airplanes)