Posts by Chip_

    Hello, I've found what I think it means through a training manual

    "Optionally, the system can be equipped with an upper limit, which

    indicates that the helicopter has passed a selected altitude from below.

    The upper limit is typically connected to the barometric pressure and

    is indicated at the PFD. Optional, the UL may be connected to the radar

    altimeter system and can operate up to radar altimeter range 2500 ft."