How big is the GTF problem? Pratt & Whitney is at pains to admit the issue in terms of cost and has sent a signal they believe they have the issue defined and a solution in place. They also believe the proposed fix covers the power issue plaguing the engine.
What do we know about the GTF population? Here is a table based on ch-Aviation’s fleet data that lists these engines’ locations by aircraft type. The problem is mainly Airbus-focused, and to date, P&W has not discussed the issue on the A220 or E2. Of the ~1,700 aircraft (2,400 engines), 81% are active. Another 7% are in maintenance.