I have been told yes by one fed and no by another.
It's not clear, to my knowledge and to justify it you have to dance through the regs:
This would be for an IPC:
61.57(d)
(1) The instrument proficiency check must be—
(ii) For other than a glider, in a flight simulator or flight training device that is representative of the aircraft category
(2) The instrument proficiency check must be given by—
(iv) An authorized instructor
So, an IPC can be done by an
authorized instructor in a flight simulator. An authorized instructor is defined as:
61.1(b)
(2) Authorized instructor means—
(i) A person who holds a ground instructor certificate issued under part 61 of this chapter and is in compliance with §61.217, when conducting ground training in accordance with the privileges and limitations of his or her ground instructor certificate;
An authorized instructor includes a
ground instructor when conducting
ground training. An instrument ground instructor can provide:
61.215
(c) A person who holds an instrument ground instructor rating is authorized to provide
(1) Ground training in the aeronautical knowledge areas required for the issuance of an instrument rating under this part;
(2) Ground training required for an instrument proficiency check
Ground training is defined as:
61.1(b)
(9) Ground training means that training, other than flight training, received from an authorized instructor.
Ground training is training other than flight training, so flight training is:
61.1(b)
(7) Flight training means that training, other than ground training, received from an authorized instructor in flight in an aircraft.
Flight training is other than ground training and in an aircraft
1.1
Aircraft means a device that is used or intended to be used for flight in the air.
This implies that an IGI could instruct in a simulator because:
- Training must be done by an authorized instructor
- An IGI is an authorized instructor
- An authorized instructor can provide ground training
- Ground training is anything other than flight training
- Flight training is anything other than ground training, in an aircaft
- A simulator is not an aircraft
This is probably the roundabout way other instructors have justified it's legality.
BUT, the other side of the token is that 61.215 defines what a ground instructor can provide, which doesn't explicitly state sim training. Also, keep in mind that a ground instructor is not required to hold a pilot certificate. Now, if I were just an IGI with no time whatsoever, would you feel comfortable flying in IMC with your friends and family because I said you were good? Dancing through the regs as stated above and it would seem legal, but is it a good idea? Probably not.
I know that it would seem kind of cool to finally sign someone else's logbook, but remember that anytime you put your name in someone's logbook as an instructor and with the purpose of furthering their legal abilities you bear some responsibility and liability. If I were to sign someone off for an IPC today, and tomorrow they best MDA/DA and bend metal, then my signature in that logbook would raise a few eyebrows.