1. Do you think a learning curve effect is at play in the manufacture of the PW1000G engines?
2. Can you think of any reasons why any learning curve effect may have been slower than predicted?

Modern day aircraft are complex pieces of engineering, increasingly using more technology, composite materials and more efficient engines. Aircraft engines are in particular improving not only in fuel efficiency, but also in range, thus contributing to lower fares for us all.
Many modern aircraft, such as the Airbus A320neo, use geared turbo-fan engines (GTF).
These relatively new engine design types use a gearing mechanism to achieve faster rotation speeds, and as a result are more fuel efficient and weigh less. They are however more expensive to purchase and more complex to manufacture. Pratt & Whitney are one manufacturer of GTF engines and their PW1000G engine entered service in early 2016.
However, the Air Transport World website reported in September 2016 that Pratt & Whitney were taking twice as long to build the PW1000G engines, and were behind their budgeted output level. This  of course has a knock-on effect for aircraft manufacturers, as their aircraft would in turn be delayed. As a result, Pratt and Whitney are reported to have made payments to airlines to compensate for lost earnings.