Final answer:
ASR minimums can be expressed as Decision Height (DH) or Minimum Descent Altitude (MDA) depending on the approach type.
Step-by-step explanation:
ASR Minimums: DH vs MDA
ASR minimums can be expressed as either Decision Height (DH) or Minimum Descent Altitude (MDA), depending on the type of approach being flown.
Decision Height (DH): DH is used for approaches with precision guidance, such as ILS (Instrument Landing System) approaches. It represents the altitude at which the pilot must make a decision to either continue descending towards the runway or execute a missed approach procedure.
Minimum Descent Altitude (MDA): MDA is used for non-precision approaches, where lateral guidance is provided, but no vertical guidance like glide slope is available. It represents the lowest altitude that the aircraft can descend to before reaching the missed approach point or the runway.