Vac
Approach climb speed
The speed to be used in case of a single engine go around with go around flaps and gear retracted
CAFM
Computerized airplane flight manual
VAP
Approach speed
The speed on final
Approach in landing config
V1
Decision speed
VFS
Final segment speed
The speed to be achieved during the final takeoff segment with gear and flaps up
VREF
Landing reference speed
A reference for VAP calculation
It is the minimum speed recommended at 50’ over the threshold
It is the speed used in landing distance calculations
V2
Takeoff safety speed
The speed to be attained at a height of 35’ when rotation is infuriated at VR following a failure of the critical engine