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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 touch
down. 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 and its upper limit is VFE of next configuration in
CONF 1, 2, 3 and VFE-5 in CONF FULL.
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 A/THR engagements.
Wind is a key factor in the "ground speed mini function".
Applicable to: ALL
TWR WIND
It is the MAG WIND entered in the PERF APPR 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.
Applicable to: ALL
TWR HEADWIND COMPONENT
The TWR HEADWIND COMPONENT is the component of the MAG WIND projected on the
runway axis (landing runway entered in the flight plan). It is used to compute VAPP and GS mini.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOTHRUST
A318/A319/A320/A321 FLEET DSC-22_30-90 P 12/16
FCOM 19 AUG 10
Applicable to: ALL
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).
Applicable to:
VAPP COMPUTATION
VAPP, automatically displayed on the MCDU PERF APPR page, is computed as follows:
VAPP = VLS+5+1/3 of the TWR HEADWIND COMPONENT
"1/3 of the TWR HEADWIND COMPONENT" has two limits:
0 kt as the ‐ minimum value (no wind or tailwind)
‐ +15 kt as the maximum value.
The flight crew can manually modify the VAPP and TWR wind values on the PERF APPR page.
Applicable to:
,
,
MSN,,,,
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 kt, whichever is the highest.
"1/3 of the TWR HEADWIND COMPONENT" has two limits:
‐ 0 kt as the minimum value (no wind or tailwind)
‐ +15 kt as the maximum value.
The flight crew can manually modify the VAPP and TWR wind values on the PERF APPR page.
Applicable to:
SPEED TARGET COMPUTATION
The FMGS continuously computes a speed target (IAS target) that is the MCDU VAPP value plus
an additional variable gust.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOTHRUST
A318/A319/A320/A321 FLEET DSC-22_30-90 P 13/16
FCOM 19 AUG 10
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.
Applicable to:
,
,
MSN,,,,
SPEED TARGET COMPUTATION
The FMGS continuously computes a speed target (IAS target) that is the MCDU VAPP value plus
an additional variable gust.
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.
The IAS targets have 2 limits:
‐ VAPP, as the minimum value
‐ VFE -5 kt in CONF FULL, or VFE of the next configuration in CONF 1, 2 or 3 as the maximum
value.
Applicable to: ALL
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 flight crew.
Applicable to:
EXAMPLE
Approach on runway 09, the tower wind direction is on the runway axis.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
AUTO FLIGHT - FLIGHT GUIDANCE
AUTOTHRUST
A318/A319/A320/A321 FLEET DSC-22_30-90 P 14/16
FCOM 19 AUG 10
Applicable to:
EXAMPLE
Approach on runway 09, the tower wind direction is on the runway axis.
Applicable to:
,
　
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