AMC6 CAT.OP.MPA.126 Performance-based
navigation
ALERTING AND ABORT
(a) Unless the flight crew has sufficient visual reference to continue the approach operation to a safe landing, an RNP APCH operation should be discontinued if:
(1) navigation system failure is annunciated (e.g. warning flag);
(2) lateral or vertical deviations exceed the tolerances;
(3) loss of the on-board monitoring and alerting system.
(b) Discontinuing the approach operation may not be necessary for a multi-sensor navigation system that includes demonstrated RNP capability without GNSS in accordance with the AFM.
(c) Where vertical guidance is lost while the aircraft is still above 1 000 ft AGL, the flight crew may decide to continue the approach to LNAV minima, when supported by the navigation system.
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