If the approach mode fails to engage or the integrity monitoring fails then the RNAVRNAV —Radio Navigation equipment is no longer effective, so you would have to revert to a basic procedure. A CDICDI —Course Deviation Indicator out by more than half full scale deflection should, and a TCAS advisory might, result in a total abandonment of the approach, not just a switch to a different one. An engine failure would have no effect and you should continue the approach.

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You are on an RNAVRNAV —Radio Navigation approach. Which of the following circumstances would lead to you reverting to a regular published approach procedure?