View Full Version : Airbus OP DES/OP CLB/ etc

8th Mar 2009, 17:50
Could someone remind me what controls the speed in OP CLB/DES mode and how does this differ from V/S?



8th Mar 2009, 17:55
OP DES is a thrust idle decent. Speed controled by the elevator and a/c will not respect any constraints.

OP CLB has CLB THR as per normal. Elevator controls speed and once again no constraits will be respected.

V/S will fly whatever the selected or managed speed is and use THR to control the rate of climb or decent.

8th Mar 2009, 19:46
Open Climb and Open Descent uses pitch to control speed with a fixed thrust setting.

With the autothrust engaged the fixed thrust settings are generally climb thrust and idle respectively.

With Vertical Speed mode the autopilot pitches to achieve the vertical speed, whilst the autothrust does its best to maintain the selected speed. The vertical speed target has preference over the speed target.

Hope that helps.

9th Mar 2009, 10:31
Cheers chaps. Appreciate it.

nurj :}