米国連邦航空局（FAA）は、シールが破損してエンジン外へ破片を飛散させ、乗務員が離陸を中止する事態を受けて、Airbus A380に搭載された特定のEngine Alliance GP7200-seriesエンジンのタービンシールを交換するよう事業者に指示しました。

The directive was published on October 8 and takes effect on October 23, 2026.

What the FAA Is Requiring

The airworthiness directive applies to Engine Alliance GP7270, GP7272 and GP7277 engines.

It requires operators to remove the high-pressure turbine interstage seal and replace it with an eligible part. 

Reports on the directive describe 15 seals, grouped by how many flight cycles each has accumulated since its last overhaul.

The most urgent group must be replaced within 50 flight cycles or 30 days of the effective date, whichever comes first.

Later groups have deadlines of up to 150 flight cycles or 90 days.

The FAA points operators to the Engine Alliance Alert Service Bulletin dated September 4, 2026, for the affected serial numbers.

The Incident Behind It

The FAA says the directive was prompted by an uncontained failure of an interstage seal on a GP7270 engine fitted to an A380.

The failure caused an engine shutdown and an aborted takeoff.

An uncontained failure means engine parts broke through the casing and left the engine.

The FAA did not name the airline, aircraft, airport or date of the incident, and reports do not say whether anyone was hurt.

What Caused the Failure

The root cause is still under investigation, and the directive is an interim action.

According to reports on the directive, the manufacturer believes cracking began at the clocking keys, which locate the seal against the first-stage turbine disk shaft.

The FAA says that, if the condition is not addressed, it could result in an engine fire and damage to the airplane.

Cost and Reach

The FAA estimates the work will cost about $528,150 per engine, almost all of it for parts.

It estimates that no engines on US-registered aircraft are affected, so the cost to US operators is zero.

The directive does not say how many engines worldwide carry the affected seals.

The FAA has not said which airlines are affected.

Engine Alliance engines have powered A380s for carriers including Emirates, Etihad Airways, Korean Air and Qatar Airways.

The A380’s other engine option, the Rolls-Royce Trent 900, is not covered.

{{REC}}

A Different Part From 2017

Engine Alliance is a joint venture of General Electric and Pratt & Whitney.

The engine family has had a high-profile uncontained failure before.

On September 30, 2017, a GP7270 on an Air France A380 flying from Paris to Los Angeles lost its fan hub and air intake over Greenland.

The aircraft diverted to Goose Bay, Canada, and no one was injured among the 497 passengers and 24 crew.

France’s BEA attributed that failure to a crack in the titanium fan hub caused by cold dwell fatigue.

The FAA issued an emergency directive on October 12, 2017, requiring inspections of the fan hubs, and a second directive in June 2018 required eddy-current testing.

The 2026 directive concerns a turbine seal, a different part of the engine.

What Happens Next

Neither the FAA nor Engine Alliance has said how many aircraft must be taken out of service for the work or how long it will take, and reports do not say whether other regulators will issue matching directives.