TAKE-OFF AT HEAVY WEIGHT
At heavy weights, F speed may be close to VMAX CONF 2 And S speed will about VMAX CONF 1+F (A333/A343:215 kt) (A346:233 kt) Which is displayed on the PFD speed tape as a red and black strip in accordance with flap lever position. In this case, three protection systems are available:
1. The Flap load Relief system (FLRS)
2. The Automatic Retraction system (ARS)
3. The Alpha lock Function
THE FLAP LOAD RELIEF SYSTEM
While in CONF 2 and when IAS reaches VMAX CONF 2, the FLRS is activated the FLRS automatically retracts the flaps to the next further retracted position. VMAX CONF 2 Remains unchanged on PFD speed scale in accordance with the flap lever position, "RELIEF" is displayed on the E/WD Flap/slat indication. If IAS Decreases below VMAX CONF 2, the flap will Re-extend
THE ALPHA LOCK FUNCTION
The slats alpha/speed lock function will prevent slat retraction at high AOA or low speed at the moment the flap lever is moved from flaps 1 to flaps 0. A lock pulses in green above the E/WD Slat indication. This is possible if maneuvering during a heavy weight take-off continue with the scheduled acceleration that will eventually trigger slats retraction.
The inhibition is removed and the slats retract when both alpha and speed fall within normal values. This protection feature is no longer available once flap lever has been selected to zero.