Originally Posted by
82spukram
The IAS targets have 2 limits:
— VAPP as the minimum value
— VFE - 5 kts in CONF FULL, or VFE of the next configuration in CONF 1, 2 or 3 as the maximum value.
Ground Speed Mini (GS Mini) Computation
Ground speed mini concept has been defined to prevent the aircraft energy from dropping below a minimum level during final approach. The GS mini value is not displayed to the Crew.
What the FM doesn’t tell you is that VLS is calculated by load planning’s best guess of your actual weight. VAPP takes the VLS guess for wind adds and Mini GS.
The Yellow dynamic VLS scale is calculated by the FACs. This difference of source is why Managed Magenta VAPP sometimes sits right on the Yellow VLS scale( the logic won’t allow it to be lower). This happens when load planning sends weights that are lower that what you really weigh.
While at cruise select AIDS-Param-Reports @2L. Then look for FAC-1 and FAC-2 weights. (If not displaying type GWFL into the boxes). Compare FAC weight to FMGC weight. Add about 1kt for every 1000lb to VAPP that FAC weight is higher than FMGC weight. Then you will have a 5 knot spread of yellow line and Magenta bug and the stick won’t get soft in the flare.