Originally Posted by rickair7777

Actually that's not true. You're confusing different parts of the ATP reg.

61.159(a)(3) allows 25 hours towards the category+class requirements in a full-flight sim. FTD no bueno there.

61.159(a)(4)(i) allows 25 hours towards the instrument requirements in a full-flight sim or FTD. I doubt this comes up often, most folks get the instrument in actual or hood during training or time-building. But if necessary (and the airline's mins allowed it) you could use FTD time or the new-hire sim time.