Embraer EMB145 Operation Manual page 327

Altitude/Speed Constraints ........................................... CHECK
Flight crew must be aware of any published altitude or speed
constraints in the procedure.
CONTINGENCY PROCEDURES
ATC............................................................................... NOTIFY
Notify any problem with the RNAV system that results in the loss of
required navigation capability, together with the proposed course of
action.
COMMUNICATION FAILURE
Continue with the RNAV procedure in accordance with the published
lost communication procedure.
RNAV CABABILITY LOSS
Navigate using an alternative means of navigation. The alternate
means does not need to be based on RNAV system.
NAVIGATION SENSORS FAILURE
Discontinue the RNAV procedure following the approved missed
approach procedure or if feasible revert to a conventional or IRS
procedure and inform ATC.
MULTIPLE SYSTEM FAILURES
If multiple system failures occur such as those affecting GNSS, Flight
Director, and any other used for RNAV procedure, perform a missed
approach and inform ATC.
If the Autopilot fails, continue the approach using manually, and in
case the flight path cannot be followed, perform a missed approach
procedure and inform ATC.
If the DGRAD annunciation is displayed:
Select the non-affected FMS. For single FMS installations, use the
procedures from the following tables:
REVISION 40
AIRPLANE
OPERATIONS
MANUAL
SUPPLEMENTARY
PROCEDURES
NAVIGATION
Page
23
1-02-80
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01