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R TWR HEADWIND COMPONENT
R   The TWR HEADWIND COMPONENT is the component of the MAG WIND projected on the
R   runway axis (landing runway entered in the flight plan). It is used to compute VAPP and GS
R   mini.
R CURRENT HEADWIND COMPONENT
The actual wind measured by ADIRS is projected on the aircraft axis to define the
CURRENT HEADWIND COMPONENT (instantaneous headwind).
The CURRENT HEADWIND COMPONENT is used to compute the variable speed target
during final (IAS target).
VAPP COMPUTATION
VAPP, automatically displayed on the MCDU PERF APPR page, is computed as follows :
VAPP  = VLS + 1/3 of the TWR HEADWIND COMPONENT or
             VAPP = VLS + 5 knots, which ever is highest.
"1/3 of the TWR HEADWIND COMPONENT" has 2 limits :
- 0 knots as the minimum value (no wind or tailwind)
- + 15 knots as the maximum value.
The crew can manually modify the VAPP and TWR wind values on the PERF APPR page
SPEED TARGET COMPUTATION
The FMGS continuously computes a speed target (IAS target) that is the MCDU VAPP value
plus an additional variable gust.
                                               I VAPP           ~L~  +gust
                                                                                   IAS TARGET
The gust is the instantaneous difference between the CURRENT HEADWIND COMPONENT
and the TWR HEADWIND COMPONENT. It is always positive (or equal to zero for no wind
or tailwind).
The IAS target is displayed on the PFD as a magenta triangle moving with the gust
variation. VAPP is the IAS target minimum value.
GROUND SPEED MINI (GS mini) COMPUTATION
R   Ground speed mini concept has been defined to prevent the aircraft energy from dropping
R   below a minimum level during final approach. The GS mini value is not displayed to the
R   crew.
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┃                                ┃                            ┃1.22.30     P 68      ┃
┃                                ┃                            ┣━━━━━┳━━━━━┫
┃I  ~-~ A318                     ┃l          AFLIGHTIGUIDANCE ┃SEQ 100 1 ┃  REV 34  ┃
┃ aw aw ,, ~e~ A319              ┃                            ┃          ┃          ┃
┃ Lii,~ A320                     ┃                            ┃          ┃          ┃
┃      A~7-~'M" A321             ┃                            ┃          ┃          ┃
　
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual2(78)