RNAV AND GPS APPROACH
The following two strategies are available for performing RNAV and GPS approaches :
1. Lateral and vertical guidance managed by the FM in final APP mode this is the recommended strategy. This strategy shall be used for approach with minima defined as a decision altitude (DA)
2. Lateral guidance managed by the FM and vertical guidance selected by the crew using NAV-FPA modes. This strategy may be used for approach with minima defined as minimum descent altitude (MDA) and shall be used for approaches which are conducted when the temperature is below the approved limit.
NAVIGATION ALERTS GENERAL
Managed approach can be continued following a NAV ACCUR DOWNGRAD if raw data indicates that the guidance is satisfactory.
RNAV AND GPS APPROACH
Both GPSs must be available and GPS PRIMARY Displayed on both MCDUs prior to commencing the approach. However once the approach has commenced. Note that a single failure, such as NAV GPS 1 FAULT, will not cause the loss of GPS primary, since the remaining GPS will update both FMGS. IF GPS Primary lost is displayed on the NDs it will be accompanied by a triple click aural alert, even though nav accuracy high may still be displayed.
Crew procedures following a nav FM/GPS POSITION DISAGREE caution, or if GPS primary lost is displayed on or both NDs depends on whether the approach is standalone, or in a radio navaid procedure
INTERMEDIATE APPROACH
APPROACH PHASE ACTIVATION
Normal approach stability requirements apply to non precision approaches. How ever, as non precision approaches are rarely flown, consider inserting a speed constraint of VAPP at the FAF to ensure a timely deceleration.
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