NON PRECISION (NON-ILS) APPROACH :
1. Non-Precision Approach will be carried out in the CANPA
Profile (Constant Angle Non-Precision Approaches) with VNAV
or V/S mode. Detailed description of CANPA is given in Part
C.
2. CANPA procedure does not involve leveling out at MDA &
Missed Approach is initiated after reaching DDA (Derived
Decision Altitude). Levelling out at MDA will only be carried
out in special Approaches, eg. CANARASI R/W 13 at JFK
where special briefing is required.
VNAV APPROACH
LNAV / VNAV or LOC / VNAV is the preferred method for
accomplishing non-ILS approaches that have an appropriate vertical
path defined on the FMC LEGS page. (V/S may be used as an alternate
method and is given subsequently).
The A/C is equipped with RNP /
ANP Alerting System. However, VNAV DA(H) will not be used. Use DDA
(Derived Decision Altitude, which is arrived at by adding 50 to the MDA).
The following should be ensured :-
1) Appropriate Vertical Path defined on the FMC Legs Page is
the same as the published Vertical Path.
2) The Glide Path from FAF to R/W coded in the FMC
Navigation Database, is the same as the published Glide
Path and is between 2.750 & 3.770.
3) Atleast one GPS or one DME is operational.
4) Such approaches may be flown provided RNP being used
is equal to or less than RNP specified for the approach.
Following RNP values must be ensured [Prog Page 4
(B777-300ER/LR) & 3 (B747-400) of FMS CDU and can
also be cross checked on ND] :
VOR - DME / VOR / NDB : 0.5
RNAV / RNAV GPS : 0.3