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Forum: Tech Log

13th Feb 2019, 23:00

Replies: 21

737 VNAV Approach Logic

Views: 16,876

Posted By Too Few Stripes

That was exactly my point. there is a...

That was exactly my point.
there is a misconception that the RNP value changing to lower than 1 is an indication of ‘on-approach’. In fact the logic would be in ‘on-approach’ before the RNP...

Forum: Tech Log

13th Feb 2019, 09:35

Replies: 21

737 VNAV Approach Logic

Views: 16,876

Posted By Too Few Stripes

The question of knowing when the FMC is in...

The question of knowing when the FMC is in on-approach logic is still open though?
we’re getting bogged down on what RNP value is displayed. The displayed RNP value is not an indication of being in...

Forum: Tech Log

12th Feb 2019, 22:17

Replies: 21

737 VNAV Approach Logic

Views: 16,876

Posted By Too Few Stripes

RNP value changes relative to where you are on...

RNP value changes relative to where you are on the approach, not whether you are in on-approach logic.

Forum: Tech Log

12th Feb 2019, 13:53

Replies: 21

737 VNAV Approach Logic

Views: 16,876

Posted By Too Few Stripes

Which is exactly what I was saying and why I...

Which is exactly what I was saying and why I specifically stated a ‘standard’ RNAV/RNP approach in my example. The change in RNP relates to the selected procedure and your position relative to it,...

Forum: Tech Log

11th Feb 2019, 23:25

Replies: 21

737 VNAV Approach Logic

Views: 16,876

Posted By Too Few Stripes

In my experience, for ‘standard’ RNP approaches...

In my experience, for ‘standard’ RNP approaches (I.e. not A-RNP or AR), the FMC displayed RNP changes to 0.3 at the FAF. The aircraft could be in on-approach logic prior to this waypoint but the RNP...

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