20V/DEV monitoring

20 V/DEV monitoring

20.1After the aircraft has passed the VIP on an approach, deviation from the defined vertical path must not exceed the limiting value for V/DEV stated in the operator’s RNP AR operating procedures.

20.2 The operator must have RNP AR operating procedures containing the limiting value for V/DEV.

20.3 The limiting value for V/DEV may only be determined after the operator has considered the following:

(a) the aircraft manufacturer’s data relating to vertical flight path accuracy;

(b) the cockpit display of V/DEV;

(c) the value used by the designer of the IAL procedure.

20.4 The operator’s determination of the limiting value for V/DEV must not exceed 75 ft below the defined vertical flight path.

20.5 The operator’s determination of the limiting value for V/DEV above the defined vertical path must not exceed 75 ft unless a figure greater than 75 ft is determined as appropriate for the aircraft type after taking into account the following:

(a) aircraft flight characteristics;

(b) the effect that any deviation may have on the safe continuation of a stabilised approach;

(c) airspeed;

(d) energy management;

(e) aircraft height above ground level;

(f) autopilot vertical gain performance.

20.6 For the purposes of this clause, the operator must have flight crew procedures for the following:

(a) monitoring V/DEV;

(b) deviation alerts and callouts;

(c) flight crew intervention;

(d) missed approach.