EASA AD US-2026-20-12 — Turbine - High-Pressure Turbine Interstage Seal - Replacement

Summary

The Federal Register document titled 'Turbine - High-Pressure Turbine Interstage Seal - Replacement' is a final rule airworthiness directive (AD 2026-20-12) issued by the FAA affecting Engine Alliance Model GP7270, GP7272, and GP7277 engines. It addresses an unsafe condition related to uncontained failure of the high-pressure turbine interstage seal, which was reported during an aborted takeoff on an Airbus A380 equipped with these engines. The AD mandates removal and replacement of certain high-cycle HPT interstage seals to prevent potential engine fire and aircraft damage.

What Changed

This new airworthiness directive requires removal from service and replacement of the high-pressure turbine interstage seal on specified Engine Alliance GP7270, GP7272, and GP7277 engines with parts eligible for installation. It introduces compliance requirements based on engine serial numbers and limits the replacement timeframe to within 50 flight cycles or 30 days after the effective date. This AD is issued as an interim action pending further investigation.

Why It Matters

This AD is critical for aviation professionals because it addresses a safety risk that could lead to engine fires and aborted takeoffs, impacting flight safety and operational reliability. Operators and maintenance organizations must ensure compliance to avoid uncontained engine failures and potential damage to aircraft. Timely adherence to this directive helps maintain airworthiness and prevents costly unscheduled maintenance or incidents.

What To Do

Affected operators must identify engines with the specified high-pressure turbine interstage seal serial numbers and remove and replace the seals with approved parts within 50 flight cycles or 30 days from October 23, 2026, whichever occurs first. Maintenance teams should follow the procedures outlined in Engine Alliance Alert Service Bulletin EAGP7-A72-479 dated September 4, 2026. Comments on the AD can be submitted to the FAA by November 23, 2026.