Military Helicopter vs Civil Altimeter Requirements
Most of us are thoroughly familiar with the civil requirements for altimeter and transponder calibration, including allowable error.
But it seems military helicopters are not subject to the civil requirements - which is acceptable until these helicopters enter civil regulated airspace where heretofore unexamined databases show a litany of CAs that were neglected.
Static port issues in rotor downwash seem to produce significant altimeter errors.