If you move the handle and then end up in a high alpha , then alpha lock is lost!
Slat Alpha Lock / Speed Baulk The Air Data / Inertial Reference Units ( ADIRU's ) supply corrected angle-of-attack ( alpha ) and computed air speed ( CAS ) data to the SFCC. The SFCC use the data to prevent slat retraction at high alpha and / or low CAS. Slat retraction is not possible if: On A319 & A320 - the alpha is more than 8.5 deg. - the CAS is less than 148 knots. The function resets if alpha decreases below 7.6 deg. or CAS increases over 154 knots. On A321: - the alpha is more than 8.0 deg. - the CAS is less than 165 knots. The function resets if alpha decreases below 7.1 deg. or CAS increases over 171 knots.
Alpha lock/speed baulk is not possible if: On A319 & A320 - the slat retraction is set before alpha is more than 8.5 deg. or CAS less than 148 knots - the aircraft is on the ground with CAS below 60 knots.
On A321 : - the slat retraction is set before alpha is more than 8.0 deg. or CAS less than 165 knots - the aircraft is on the ground with CAS below 60 knots.
When the function is active, the ECAM shows the message A-Lock ( cyan, pulsing ) below the slat position ind