Normal Circuits Flashcards
Five legs of normal circuit
Upwind Crosswind Downwind Base Final
Static RPM
Acceptable range of RPM at beginning of take off roll.
Vr
Rotation airspeed
Vtoss
Take off safety speed. Generally equals stall speed x 1.2 (so ~ 60 knots).
Minimum height to turn from upwind to crosswind after takeoff
500’ AGL
Minimum height to turn from base to final
500’ AGL
Vref
Approach speed for landing. Equals stall speed x 1.3 (so ~75 knots).
Vref is established on _________ and maintained until __________ commences.
Final, Landing
Target on final to be established at Vref
Mid-final, approx 300’ AGL
When there is a headwind above 10 knots, Vref needs to be [increased][decreased]
Increased (due to reduction of headwind component that occurs near ground – windshear)
Formula for adjusting Vref for headwinds above 10 knots.
Increase Vref by 1/2 knot for each knot of headwind above 10 knots (e.g., if 20 knot headwind, increase Vref by 10 knots)
Target Threshold Speed (TTS)
Vref as adjusted for headwinds above 10 knots
Maximum addition to Vref on account of headwinds in PA-28
10 knots (taking Vref from 65 knots to TTS of 75 knots)
Rolling checks during take off (4 items)
Static RPM achieved
Ts/Ps all in green
Airspeed alive
Maintain runway centerline
After take off, confirm you have achieved your ______
Vtoss
Aim of the upwind leg
To climb to 500’ AGL on extended runway center line