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A330/A340<br />
FLIGHT CREW<br />
OPERATING MANUAL<br />
Applicable to: ALL<br />
GUIDANCE IN A HOLD<br />
<strong>AIRCRAFT</strong> <strong>SYSTEMS</strong><br />
AUTO FLIGHT - FLIGHT GUIDANCE<br />
AP/FD VERTICAL MODES - DESCENT MODE<br />
Just before the aircraft enters a holding pattern, the speed target becomes the holding speed.<br />
In the holding pattern, the DES mode commands the V/S at -1 000 ft while A/THR maintains the<br />
holding speed. The aircraft will level off at the next altitude constraint if it is reached during the<br />
hold.<br />
The vertical deviation (VDEV) is based on the altitude at which the aircraft is supposed to cross<br />
the exit fix in order to be properly positioned on the descent profile.<br />
Until the flight crew exits the hold, the FMGES in DES mode will maintain V/S = -1 000 ft/min<br />
considering downpath vertical constraint. This means that the aircraft will not descent below the<br />
next altitude constraint. If the aircraft reaches the next altitude constraint it will level off and ALT<br />
CST mode will engage.<br />
Applicable to: ALL<br />
TOO STEEP PATH<br />
A descent segment is called “too steep path” when the FMGES predicts that the descent segment<br />
between two constraint waypoints is impossible to fly at the planned descent speed with half<br />
speedbrake extended.<br />
When this occurs, the MCDU displays no predictions between the upper and the lower points of<br />
the too steep path. Relevant message “TOO STEEP PATH” is displayed on MCDU.<br />
RJA A330/A340 FLEET DSC-22_30-70-50 P 15/16<br />
FCOM ← I → 25 NOV 11