Boeing FCTM
"Retract the landing gear after a positive rate of climb is indicated on the Altimeter"
The Altimeter is the primary indication of a climb for Takeoff and Go-Around.
Altimeter requires a change in pressure to indicate a climb. There is some lag and will help to keep you safe in a windshear event.
The IVSI uses IRU/ADIRU and will indicate a climb with a pitch change, if you are not climbing it will return to zero. Some years ago Boeing removed VSI from the above requirement for a positive rate.
Rad Alt will indicate a climb if the terrain is falling away.
Why is there such a rush to get the gear up? I regularly see guys calling for gear up before the ground/flight relays open.
Last edited by Jetdriver; 19th August 2012 at 10:45.