As a B.Tech Mechanical Engineer serving as a Corporal (equivalent to Naik) in the Indian Air Force, I’ve cleared the Jammu and Kashmir State Civil Services exam. However, the pay scale is slightly lower than what I currently earn. Can I legally get discharged from service after filing a case, or are there other options available to me?

You cannot legally get discharged from service just because you’ve cleared another exam with a lower pay scale. The Indian Air Force has specific regulations regarding discharge, and it’s unlikely to be granted solely for this reason. You could explore options like applying for a lateral transfer to another department within the Air Force or opting for voluntary retirement after completing your minimum service obligation.