What is Assumed Pensionable Pay?

Question:
What is Assumed Pensionable Pay?
Answer:

Assumed Pensionable Pay (APP) is used to calculate the pension benefit payable where a member receives reduced or no pay due to sickness absence, child related absence or Reserve Forces leave. It is essentially the pay you would have received had you been at work.

Your employer calculates this figure by looking at the amount of pay you received in the 3 months before your pay started to be reduced.