AMC7 NCO.OP.116
Performance-based navigation – aeroplanes and helicopters
CONTINGENCY PROCEDURES
(a) The pilot-in-command should make the necessary preparation to revert to a conventional arrival procedure where appropriate. The following conditions should be considered:
(1) failure of the navigation system components including navigation sensors, and a failure effecting flight technical error (e.g. failures of the flight director or autopilot);
(2) multiple system failures affecting aircraft performance;
(3) coasting on inertial sensors beyond a specified time limit; and
(4) RAIM (or equivalent) alert or loss of integrity function.
(b) In the event of loss of PBN capability, the pilot-in-command should invoke contingency procedures and navigate using an alternative means of navigation.
(c) The pilot-in-command should notify ATC of any problem with PBN capability.
(d) In the event of communication failure, the pilot-in-command should continue with the operation in accordance with published lost communication procedures.
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