I've been in the sand box a while and need some FAR interpretation help. I'm trying to find guidance on a ATP holding a CFI not CFII, teaching instruments in a FTD for a student seeking instrument time for a rating (ATP). The instructor is a former military pilot that use to be an IE (instrument examiner- esseintially the military equivalent of a civilian CFII). Any previous forums or FAA legal interpretation any one can think of? And would he sign the student's log book as CFI or ATP if he were able to teach instruments in the FTD. (Training will be taking place under part 61 not 135).