9.g
Sorry, your statement, not completely correct!
Regulatory agencies will establish DA(h)/MDA(H). For example, minimum DA for a cat I is 200, minimum MDA for a VOR/LOC is 250, minimum MDA for an NDB is 300 etc, etc. this under EU OPS for example.
States publish OCA and it is then to the operator to derive a DA/MDA taking into account the above regulatory minimums or crew minimums or aircraft minimums.
What Jeppesen does is to take the regulatory minimums and compute a DA which cannot be less than the the state published OCA. They don't take into account crew or aircraft minima. That is upto the operator. I believe for example that US FAA requires minimal experience to operate to the lowest minima! And some aircraft might need higher minima due to systems.
So, they don't rename it! They use it to DERIVE minimums!!
An example, a state publishes a OCA for a runway as 215'. If there is a ILS approach the DA would be 215'( limited by OCA). If there is an LOC/VOR APP the MDA would be 250'( limited by regulatory).
In case of CAT II/III it gets a little more complicated because they use OBSTACLE FREE ZONES or OFZ, this because the see and avoid principle does not apply, in case of CAT II as long as OCA does not exceed 100' still okay, in case of CAT III no OCA exists.
Hope this makes sense!
Last edited by flyburg; 22nd December 2012 at 21:16.