Originally Posted by
Capn Bloggs
My (out of town) take: doesn't matter how many engines you have going. If you can make 7%, use the 222ft/122ft minimums. If you can only make 2.5%, then you have to use the 1332ft minimum (as shown in the Missed Approach procedure text). Those gradients merely provide suitable obstacle clearance. How you achieve them on 1, 2, 3, or 4 engines is entirely up to you/you company.
"OCA/H" an odd way of saying DA/DH?
OCA/.H (Obstacle Clearance altitude/height) are published by the procedure designer. These have to be converted to DA/H. Using height: you compare the OCH to the system minima. So if OCH is 160ft and system minima for ILS is 200ft, then you use 200ft. If the OCH is 250 and system minima is 200ft, then you use 250ft.
Jeppesen and other companies do this for you, AIP's do not!