AIRCRAFT SYSTEMS - e-Crew

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A330/A340 FLIGHT CREW OPERATING MANUAL “1/3 of the TWR HEADWIND COMPONENT” has 2 limits: ‐ 0 kt as the minimum value (no wind or tailwind) ‐ +15 kt as the maximum value. AIRCRAFT SYSTEMS AUTO FLIGHT - FLIGHT GUIDANCE AUTOTHRUST The flight crew can manually modify the VAPP and TWR wind values on the PERF APPR page. SPEED TARGET COMPUTATION The FMGES continuously computes a speed target (IAS target) that is the MCDU VAPP value plus an additional variable gust. The IAS target is displayed on the PFD as a magenta triangle moving with the gust variation. SPEED TARGET COMPUTATION ABOVE 400 FT: 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 targets have 2 limits: ‐ VAPP as minimum value ‐ VFE-5 kt in CONF FULL and VFE in CONF 1, 2, 3 as maximum value. SPEED TARGET COMPUTATION BELOW 400 FT: The gust taken into account is only 1/3 of the instantaneous difference between CURRENT HEADWIND and the TWR HEADWIND COMPONENT. This is done to prevent any important thrust variation in late final. The minimum and maximum values remain unchanged. 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. EXAMPLE Approach on runway 09, the tower wind direction is on the runway axis. RJA A330/A340 FLEET DSC-22_30-90 P 18/22 FCOM ← I → 03 MAY 11
A330/A340 FLIGHT CREW OPERATING MANUAL IAS TARGET VALUES AIRCRAFT SYSTEMS AUTO FLIGHT - FLIGHT GUIDANCE AUTOTHRUST If we turn the previously explained speed target definition into formulae, we obtain the following result: ABOVE 400 FT: IAS TARGET = Max [VAPP, (VAPP + CURRENT HEADWIND - TWR HEADWIND)] (1) Current Wind in Approach IAS Target (a) 090/50 Max [VAPP, (140+50-30)] = 160 kt (b) 090/10 Max [VAPP, (140+10-30)] = 140 kt (c) 270/10 Max [VAPP, (140+0-30)] = 140 kt (d) 090/30 Max [VAPP, (140+30-30)] = 140 kt (1) For this computation, the TWR HEADWIND is voluntarily limited to 10 kt as a minimum. BELOW 400 FT: IAS TARGET = Max [VAPP, VAPP + 1/3 (CURRENT HEADWIND - TWR HEADWIND)] That is equivalent to: IAS TARGET = Max (VAPP, VLS + 1/3 of CURRENT HEADWIND COMPONENT) RJA A330/A340 FLEET DSC-22_30-90 P 19/22 FCOM ← I → 03 MAY 11
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