TO/GA power issues

[mattgamingphx]

 Hi, 

 

When I'm taking off and place thrusts manually to 40% range, after activating TO/GA power my thrust only goes to 81%? This is causing me to have barely any power to get off the runway, is there something I'm doing wrong? Thanks. 

[Litjan]

Hi, there could be several things causing this, so please check them off one by one:

• A very hot ambient temperature combined with high field elevation
• An inadvertantly set high TASS in the FMS
• Your joystick interfering with the virtual thrust levers during takeoff run - some people try to move their hardware throttle "along" with the advancing thrust levers - this will cause them to snap back to "manual control" when the plane passes 84kts (THR HOLD), and the throttle being now controlled by hardware throttle again. To avoid this, follow the recommended procedure: Click TOGA button, immediately advance joystick throttle to forward mechanical stop (full power!).
• A spikey joystick throttle that "regains" control of the virtual thrust levers by accident.

If all this fails, please post a video of a takeoff where this happens and we will go from there.

Cheers, Jan

 

Edited August 23, 2017 by Litjan

[mattgamingphx]

 

11 hours ago, Litjan said:

Hi, there could be several things causing this, so please check them off one by one:

• A very hot ambient temperature combined with high field elevation
• An inadvertantly set high TASS in the FMS
• Your joystick interfering with the virtual thrust levers during takeoff run - some people try to move their hardware throttle "along" with the advancing thrust levers - this will cause them to snap back to "manual control" when the plane passes 84kts (THR HOLD), and the throttle being now controlled by hardware throttle again. To avoid this, follow the recommended procedure: Click TOGA button, immediately advance joystick throttle to forward mechanical stop (full power!).
• A spikey joystick throttle that "regains" control of the virtual thrust levers by accident.

If all this fails, please post a video of a takeoff where this happens and we will go from there.

Cheers, Jan

 

Thanks for the reply! I think I've been doing the takeoff procedure wrong all of this time. I'd normally do 40% thrust, then hit TO/GA and was not putting the thrust levers to full power afterwards. I however haven't had the chance to test this out yet until later today. I'll report any issues, thanks again.