@5LY: yes, thank you, I suppose we are all aware of the physics behind it. I interpreted the original question as a procedural/operational one.
Do also note that a glideslope check altitude is not a mandatory crossing altitude. Obviously if you are on the glideslope and there's a check, say passing OM at 1500' AGL on the plate, and the temp is -10, then you should expect to see some 1650 or so on the altimeter. This is different from a STAR/long approach which may instruct you to cross fix XXX at a given altitude, say 5000'; not above, not below. That may be for procedural purposes, and in such a case it would not be acceptable to deviate from that altitude
without an amended clearance.. You do not need such an amended clearance for adjusting
minimum altitudes.
The difference on the plates:
____
5000 and simply
5000.
First one you need to request reclearance for, but not for the latter. Agree?
