Capn Bloggs, there's 2 different approaches using CFDA technique as well:
Approach with a
designated vertical profile using the CDFA technique:
a. The optimum angle for the approach slope is 3 degrees, and the gradient should preferably not exceed 6.5 percent which equates to a slope of 3.77 degrees, (400 ft/NM) for procedures intended for conventional aeroplane types/classes and/or operations. In any case, conventional approach slopes should be limited to 4.5 degrees for Category A and B aeroplanes and 3.77 degrees for Category C and D aeroplanes, which are the upper limits for applying the CDFA technique. A 4.5 degree approach slope is the upper limit for certification of conventional aeroplanes.
b. The approach is to be flown utilising operational flight techniques and onboard navigation system(s) and navigation aids to ensure it can be flown on the desired vertical path and track in a stabilised manner, without significant vertical path changes during the final-segment descent to the runway. APV is included.
c. The approach is flown to a DA(H). d. No MAPt is published for these procedures.
Approach with a
nominal vertical profile using the CDFA technique:
The optimum angle for the approach slope is 3 degrees, and the gradient should preferably not exceed 6.5 percent which equates to a slope of 3.77 degrees, (400 ft/NM) for procedures intended for conventional aeroplane types / class and / or operations. In any case, conventional approaches should be limited to 4.5 degrees for Category A and B aeroplanes and 3.77 degrees for Category C and D aeroplanes, which are the upper limits for applying CDFA technique. A 4.5 degree approach slope is the upper limit for certification of conventional aeroplanes.
The approach should meet at least the following facility requirements and associated conditions. NDB, NDB/DME, VOR, VOR/DME, LLZ, LLZ/DME, VDF, SRA, RNAV(LNAV) with a procedure which fulfils the following criteria:
i. The final approach track off-set ≤ 5degrees except for Category A and B aeroplanes, where the approach-track off-set is ≤ 15 degrees; and
ii. A FAF, or another appropriate fix where descent is initiated is available; and
iii. The distance from the FAF to the THR is less than or equal to 8 NM in the case of timing; or
iv. The distance to the threshold (THR) is available by FMS/RNAV or DME; or
v. The minimum final-segment of the designated constant angle approach path should not be less than 3 NM from the THR unless approved by the Authority.
CDFA may also be applied utilising the following:
i. ii.
RNAV/LNAV with altitude/height cross checks against positions or distances from the THR; or Height crosscheck compared with DME distance values. The approach is flown to a DA(H). The approach is flown as an SAp.
Note: Generally, a MAPt is published for these procedures.
So-called dive and drive is still there and can be used it requires the minimum to be increased accordantly.