Oman CAA IR(H) Practice Questions - Oman Civil Aviation Authority Instrument Rating Helicopter Theoretical Knowledge Examination Exam

DH is referenced to the threshold elevation (or TDZE) for precision approaches, whereas MDH is referenced to aerodrome elevation (or threshold elevation) for non-precision approaches DH is used only for non-precision approaches, whereas MDH applies strictly to CAT II and III ILS procedures DH is measured in MSL altitude, while MDH is measured in AGL height MDH requires immediate missed approach initiation upon reaching height, whereas DH allows level flight past the fix