Can a CFI with a high altitude endorsement but no MEI give another pilot a high altitude endorsement in a multiengine airplane if he is a multiengine pilot??? Just wondering because like the high performance endorsement it is not specific to multi or single engine. Thanks all.

Additional training required for operating pressurized aircraft capable of operating at high altitudes. (1) Except as provided in paragraph (g)(3) of this section, no person may act as pilot in command of a pressurized aircraft (an aircraft that has a service ceiling or maximum operating altitude, whichever is lower, above 25,000 feet MSL), unless that person has received and logged ground training from an authorized instructor and obtained an endorsement in the person's logbook blah blah blah blah blah

It isn't something that has to do with how many engines you have, but with the magic number "25,000," so I'd say it's fine.

The endorsement itself is not engine-specific, so that's not a problem.

The question is can an ASEL CFI give training in a ME airplane? Well, it depends...you cannot give training towards a ME rating, but you CAN give instrument instruction provided you have a CFII, a ME rating, and the required PIC hours in the make and model.

I suspect that the HAE falls into the same category, but I would ask the FSDO to be safe. Again don't forget the requirement for 5 hours PIC in make and model to give ANY instruction in a ME airplane.

The ground training required by 61.31(g)(1) can be given by any qualified ground or flight instructor. The flight training required by 61.31(g)(2) would have to be given by a flight instructor with the appropriate category and class ratings on both his pilot and flight instructor certificates - 61.195(b).

If the aircraft used for the high altitude endorsement was multiengine, then the flight instructor would have to be an MEI.

I called the FSDO...it has to be with an MEI for the reasons stated in the above post. Thanks all.

My understanding is that the 5 hours applies only to instruction toward a certificate or rating; aircraft checkouts, general or instrument currency, flight reviews do not fall under this requirement.

I am not sure if an FAR required endorsement (which would be considered an operating privilege) falls under this requirement. I agree that checkouts, BFR's, etc do not.

I have not seen that specific issue dealt with, but the reg is very specific that it applies to training for certificates and ratings.

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Training received in a multiengine airplane, a helicopter, or a powered-lift. A flight instructor may not give training required for the issuance of a certificate or rating in a multiengine airplane, a helicopter, or a powered-lift unless that flight instructor has at least 5 flight hours of pilot-in-command time in the specific make and model of multiengine airplane, helicopter, or powered-lift, as appropriate.
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The regs and FAA Chief Counsel interpretations have been very consistent that an endorsement is not a rating.