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┃      A~7-~'M" A321             ┃                            ┃          ┃          ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                            ┃          ┃          ┃
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SPEED MODE IN APPROACH PHASE
When the aircraft flies an approach in managed speed, the speed target displayed on the
PFD in magenta, is variable during the approach.
This managed speed target, is computed in the FMGS using the "ground speed mini
function".
GROUND SPEED MINI FUNCTION PRINCIPLE
The purpose of the ground speed mini function is to take advantage of the aircraft inertia,
when the wind conditions vary during the approach. It does so by providing the crew with
an adequate indicated speed target. When the aircraft flies this indicated speed target, the
energy of the aircraft is maintained above a minimum level ensuring standard aerodynamic
margins versus stall.
If the A/-I-HR is active in SPEED mode, it will automatically follow the IAS target, ensuring
an efficient thrust management during the approach.
The minimum energy level is the energy level the aircraft will have at touch down if it lands
at VAPP speed with the tower reported wind as inserted in the PERF APPR page.
The minimum energy level is represented by the Ground Speed the aircraft will have at
touchdown. This Ground Speed is called "GROUND SPD MINI".
During the approach, the FMGS continuously computes the speed target using the wind
experienced by the aircraft in order to keep the ground speed at or above the "Ground
Speed Mini".
The lowest speed target is limited to VAPP.
The speed target is displayed on the PFD speed scale in magenta, when approach phase
and managed speed are active. It is independent of the AP/FD and/or ATHR engagements.
Wind is a key factor in the ground speed mini function.
TWR WIND
It is the MAG WIND entered in the PERF approach page. It is the average wind as provided
by the ATIS or the tower. Gusts must not be inserted, they are included in the ground speed
mini computation.
CCM ALL
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┃I  ~-~ A318                     ┃  AUTO FLIGHT   ┃1.22.30     P 67      ┃
┃ aw aw ,, ~e~ A319              ┃                ┃                      ┃
┃                                ┃                ┣━━━━━┳━━━━━┫
┃ Lli,~ A320                     ┃                ┃SEQ 100 I ┃I REV 34  ┃
┃      A~7-~'M" A321             ┃FLIGHT GUIDANCE ┃          ┃          ┃
┃   FLIGHT CREW OPERATING MANUAL ┃                ┃          ┃          ┃
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本文鏈接地址：AIRBUS A320 Flight Crew Operating Manual2(77)