AIRCRAFT SYSTEMS - e-Crew

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A330/A340 FLIGHT CREW OPERATING MANUAL The speed or Mach target may be: ‐ Selected on the FCU by the flight crew ‐ Managed by the FMGEC. AIRCRAFT SYSTEMS AUTO FLIGHT - FLIGHT GUIDANCE AUTOTHRUST When in SPEED or MACH mode, the A/THR does not allow speed excursions beyond the following limits regardless of the target speed or Mach number: ‐ For a selected speed target, the limits are VLS and VMAX (VMO-MMO, VFE-VLE, whichever applies) ‐ For a managed speed target, the limits are maneuvering speed (Green Dot, S, F, whichever applies) and maximum speed (320/0.84-VFE-VLE whichever applies). In descent, the maximum managed speed targets computed by the FMS are 315/0.83-VFE-VLE, whichever applies. The changeover from SPEED to MACH mode is either automatically performed by the FMGEC or manually by the flight crew (in selected speed target only) by pushing the SPD/MACH pb. The FMA displays "SPEED" or MACH". MACH MODE IN CRUISE PHASE (A/THR SOFT MODE) When the aircraft is in ALT CRZ mode with the autopilot engaged, autothrust engaged in MACH mode, and is within a ± 3 kt range of the target speed, the autothrust soft mode engages. This mode reduces the thrust variation in cruise, specifically in light turbulence. The autothrust soft mode disengages when the speed deviation from the target becomes too large or the target is modified. Autothrust transition from soft to basic mode may lead to transient thrust variation. This mode is inhibited with the speedbrakes extended, or with an engine-out, or when Mach target is below M 0.65. Applicable to: ALL GENERAL 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 FMGES, 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’s inertia when the wind conditions vary during the approach. It does so by providing the flight crew with an adequate indicated speed target. When the aircraft flies this indicated speed target, the energy of RJA A330/A340 FLEET DSC-22_30-90 P 16/22 FCOM ← H to I → 03 MAY 11
A330/A340 FLIGHT CREW OPERATING MANUAL AIRCRAFT SYSTEMS AUTO FLIGHT - FLIGHT GUIDANCE AUTOTHRUST the aircraft is maintained above a minimum level, ensuring standard aerodynamic margins versus stall. If the A/THR is active in SPEED mode, it will automatically follow the speed target, ensuring efficient thrust management during the approach. The minimum energy level is the energy level the aircraft will have at touchdown, 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 FMGES 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 lower limited to VAPP, and is upper limited to 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 ATHR engagements. Wind is a key factor in the ground speed mini function. TWR WIND TWR WIND is the MAG WIND entered in the PERF APPR page. It is the average wind provided by the ATIS or the Tower. Gusts must not be inserted, they are included in the aircraft target speed computation. TWR HEADWIND COMPONENT The TWR HEADWIND COMPONENT is the component of the TWR wind projected on the runway axis (landing runway entered in the flight plan). It is used to compute VAPP and GS mini. 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 kt, whichever is the highest. RJA A330/A340 FLEET DSC-22_30-90 P 17/22 FCOM ← I → 03 MAY 11
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