SRS Help
Greetings. The Speed Reference system is a TOGA (Take off and go around mode) on the Airbus. I'll describe what I know about the A320 one as it's the SIM we have.
If you understand Level Change or in Airbus Open Climb/Descent modes, you will know that the autopilot controls speed using pitch and the autothrottle just delivers climb thrust or idle.
With SRS, during takeoff or go around (almost a takeoff) the Flight Director and then the Autopilot will control speed in pitch (or get you to) so that it doesn't fall below V2 plus 10 kts. The throttle at the time will be in the TOGA position delivering loads of thrust. This ensures a safe rapid climb out up to acceleration altitude. Once you reach acceleration altitude, the system will go into normal NAV or Op Climb mode and pitch will be reduced to bring you up to generally 250 kts below FL100.
Hope that helps.
Last edited by PFD; 30th Mar 2021 at 11:56.
Reason: 2 links by mistake