Originally Posted by
Dan Dare
What about QNE?
You'd need a QNE minimum as well.
FAA AIM recommends not to operate when you can't adjust to low pressure (and once more impressed by how the FAA manages to produce useful information in readable form, an art totally lost to EASA).
7.5.2 Low Barometric Pressure
When abnormally low barometric pressure conditions occur (below 28.00), flight operations by aircraft unable to set the actual altimeter setting are not recommended.
NOTE-
The true altitude of the aircraft is lower than the indicated altitude if the pilot is unable to set the actual altimeter setting.