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A330/A340<br />
FLIGHT CREW<br />
OPERATING MANUAL<br />
“1/3 of the TWR HEADWIND COMPONENT” has 2 limits:<br />
‐ 0 kt as the minimum value (no wind or tailwind)<br />
‐ +15 kt as the maximum value.<br />
<strong>AIRCRAFT</strong> <strong>SYSTEMS</strong><br />
AUTO FLIGHT - FLIGHT GUIDANCE<br />
AUTOTHRUST<br />
The flight crew can manually modify the VAPP and TWR wind values on the PERF APPR page.<br />
SPEED TARGET COMPUTATION<br />
The FMGES continuously computes a speed target (IAS target) that is the MCDU VAPP value<br />
plus an additional variable gust.<br />
The IAS target is displayed on the PFD as a magenta triangle moving with the gust variation.<br />
SPEED TARGET COMPUTATION ABOVE 400 FT:<br />
The gust is the instantaneous difference between the CURRENT HEADWIND COMPONENT<br />
and the TWR HEADWIND COMPONENT. It is always positive (or equal to zero for no wind or<br />
tailwind).<br />
The IAS targets have 2 limits:<br />
‐ VAPP as minimum value<br />
‐ VFE-5 kt in CONF FULL and VFE in CONF 1, 2, 3 as maximum value.<br />
SPEED TARGET COMPUTATION BELOW 400 FT:<br />
The gust taken into account is only 1/3 of the instantaneous difference between CURRENT<br />
HEADWIND and the TWR HEADWIND COMPONENT. This is done to prevent any important<br />
thrust variation in late final.<br />
The minimum and maximum values remain unchanged.<br />
GROUND SPEED MINI (GS MINI) COMPUTATION<br />
Ground speed mini concept has been defined to prevent the aircraft energy from dropping below a<br />
minimum level during final approach. The GS mini value is not displayed to the flight crew.<br />
EXAMPLE<br />
Approach on runway 09, the tower wind direction is on the runway axis.<br />
RJA A330/A340 FLEET DSC-22_30-90 P 18/22<br />
FCOM ← I → 03 MAY 11
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