My opponent has a Lenara Kahn (whose first listed skill is Astrometrics) in her team, together with an Engineering Pad (which gives all Engineers, like Lenara, Astrometrics).
On a mission attempt I play Accelerated Aging (which makes the first listed skill unusable).
Now its unclear to us what happens:
Either the Padd goes first (that means she had 2 Astrometrics) and the Aging removed that skill from her list (so she had none left). -> This argumentation says that as she already had the Padd with her on the mission attempt, the addition must come first.
Or the Aging goes first which removed her Astrometrics and then the Padd which gave it back to her (so she ends up with 1 Astrometrics). -> This argumentation says that the Padd is active only when required, so it adds an Astrometrics in the end.