Guy Morton
Filing Flight Plan
- Joined
- Jul 30, 2020
- Messages
- 12
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Display name:
GM
During a practice IFR test, I got the following question: While flying a GPS approach, you see the GPS display an LNAV/VNAV annunciation. What action should you take?
The correct answer, apparently, is that the LNAV/VNAV annunciation indicates that both lateral and vertical guidance have failed and you need to execute a missed approach.
But, wouldn’t it be the case, if the aircraft had LNAV/VNAV capability, and the airport offered both approaches, that if WAAS failed, the GPS would “fail down” to an LVAN/VNAV approach and you could fly that down the appropriate minimums?
The correct answer, apparently, is that the LNAV/VNAV annunciation indicates that both lateral and vertical guidance have failed and you need to execute a missed approach.
But, wouldn’t it be the case, if the aircraft had LNAV/VNAV capability, and the airport offered both approaches, that if WAAS failed, the GPS would “fail down” to an LVAN/VNAV approach and you could fly that down the appropriate minimums?