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Old 26th Apr 2011, 15:13
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777fly
 
Join Date: Jan 2005
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Kit344. Airspeed VS groundspeed?

Certainly, in the B777 simulator, actual ground speed data is available on the ND when air data computer airspeed data is lost due to simulated probe icing problems. There is no reason to suppose that the same would not apply in the real world.
We were using this scenario in a recent series of OPC checks and the GPS groundspeed was an excellent guide to TAS. Note that this might not be of help at high cruise altitude, where a 480 GS/TAS might be achieved at an EAS of about 260kt. A 400kt GS might have you into buffet onset. It's a much better guide below FL100.
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