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Old 8th Nov 2001, 11:36
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QAVION
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Post 747-400 Airspeed Bug Behaviour

A question for pilots who forget to enter the winds for descent into their FMC's :

On a 747-400, during VNAV descent (Idle) with unexpected tailwinds...

When the aircraft attempts to maintain VNAV path by speeding up, does the Command Airspeed Bug (CAB) on the PFD follow the aircraft airspeed as it rises... or does the CAB remain fixed to the original descent target airspeed?

Thanks.
Q.