When I first came back from driving school, I went into being a TCD at 85% the ground top rate. Since then I have had to take a 22.3 (inside/air combo) so that the part timer below me, didn't pass me in seniority for when a FT ground job opened up. For our building when a TCD goes FT ground, he/she maintains the 85% top rate pay, until progression catches up. My question is how long after taking the inside/air job do I have until I would have to completely restart the pay progression for a FT ground job once I get it. I've heard 6 months, 12 months, and also that since there is still driving in my job, even though it's only air, I would never lose my qualification or TCD rate. Thank you for your time.