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As per FCOM 3.04.91, consider requesting a lower flight level to increase margin to buffet onset The same exercise may be performed with light to medium turbulence levels. In this case, an aural stall warning might be triggered even without a control input from the pilot. Both pilots should practice the exercise. 3.5 – TRAINING CONSOLIDATION Position the aircraft at FL 350 and normal operations (AP/FD and A/THR on). Revert to Alternate Law using the same procedure, as point 3.2 In this training consolidation, the unreliable speed at high altitude will be repeated without any reference to the remaining air data and without reference to the ISIS or standby instruments. After stabilizing the aircraft at high altitude, descend to FL 250 using the UNRELIABLE SPEED INDICATION/ADR CHECK PROC from the QRH. In order to reinforce the flying technique “pitch and thrust”, AIR DATA sel may be switched momentarily so that PNF has the correct speed reference and can cross check the procedure for training purposes. Descending to a lower altitude will increase the margin and consequently reduce the occurrence of stall warning. During descent, transfer control between pilots. Stop the exercise when both pilots feel comfortable with the handling of aircraft using the pitch reference. During session debriefing, discuss the action plan: diversion, continuation of flight, impact for approach, use of GPS ground speed and other options considered useful and relevant. 4 – DURATION 30 minutes 5 – DOCUMENTATION QRH UNRELIABLE SPEED INDICATION / ADR CHECK PROC QRH SEVERE TURBULENCE FCTM ABNORMAL OPERATIONS / NAVIGATION / ADR CHECK PROC / UNRELIABLE SPEED INDICATION QRH PROCEDURE FCOM vol 1.27.30,3.04.27 and 3.04.91