Originally Posted by
Zenj
I have a question on RNAV approach with full guidance that's LNAV and VNAV, why do we have to select platform altitude ( that's a final approach fix altitude ) when we are cleared for non precision RNAV approach ?
I take it that you're higher than FAF and you are cleared for approch. You will have to descend to FAF or platform altitude or FINAL APP will not engage from above. It can intercept the path from below but not from above.