AIRCRAFT SYSTEMS - e-Crew

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A330/A340 FLIGHT CREW OPERATING MANUAL Applicable to: ALL AIRCRAFT ABOVE THE DESCENT PROFILE AIRCRAFT SYSTEMS AUTO FLIGHT - FLIGHT GUIDANCE AP/FD VERTICAL MODES - DESCENT MODE If the aircraft is above the descent profile, the speed will increase toward the upper limit of the managed speed range. If the speed reaches the upper limit, the aircraft will maintain the speed but will deviate from the profile (autothrust at idle). The navigation display presents a pseudo waypoint (intercept point) along the flight plan that assumes the aircraft will return to the profile using: ‐ Idle thrust ‐ 1/2 speedbrake extension ‐ ECON speed plus a margin (until intercepting the profile). If necessary, the message “EXTEND SPD BRK” comes up on the PFD and the MCDU, and remains there as long as more drag (speedbrakes) is still required. The flight crew should respond to this message by deploying half speedbrakes. Whenever the intercept point is predicted to be close to a constrained waypoint, the PFD and MCDU display an “EXTEND SPD BRK” message. Note: With DES mode engaged, the speedbrakes extension will not necessarily increase the descent rate. It increases only if the aircraft is above path. RJA A330/A340 FLEET DSC-22_30-70-50 P 12/16 FCOM ← I → 25 NOV 11
A330/A340 FLIGHT CREW OPERATING MANUAL Applicable to: ALL AIRCRAFT BELOW THE DESCENT PROFILE AIRCRAFT SYSTEMS AUTO FLIGHT - FLIGHT GUIDANCE AP/FD VERTICAL MODES - DESCENT MODE If the aircraft is below the descent profile, its speed will be maintained at target speed until it reaches the descent profile. The lower margin becomes effective when the aircraft is on the descent profile but has to loose speed in order to stay on it. The intercept point on the navigation display is based on the following assumptions: � If the aircraft is flying at an altitude that is higher than both the descent speed limit altitude and the destination elevation +5 000 ft: The FMGES maintains the V/S at -1 000 ft/min and the target speed, until the aircraft reaches the altitude constraint or intercepts the descent profile. � If the aircraft is flying at an altitude that is lower than either the descent speed limit altitude, or the destination elevation +5 000 ft: The FMGES maintains the V/S at - 500 ft/min and the target speed, until the aircraft reaches the altitude constraint or intercepts the descent profile. RJA A330/A340 FLEET DSC-22_30-70-50 P 13/16 FCOM ← I → 25 NOV 11
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