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NORMAL OPERATIONS
DESCENT
 
DESCENT CONSTRAINTS
Applicable to: ALL
Descent constraints may be automatically included in the route as part of an arrival procedure or they may be manually entered through the MCDU F-PLN page. The aircraft will attempt to meet these as long as DES mode is being used.
The crew should be aware that an ATC "DIR TO" clearance automatically removes the requirement to comply with the speed/altitude constraints assigned to the waypoints deleted from the F-PLN. However, if intermediate waypoints are relevant, e.g. for terrain awareness, then "DIR TO" with ABEAMS may be an appropriate selection as constraints can be re-entered into these waypoints if required.
Following the selection of HDG, DES mode will switch automatically to V/S, and altitude constraints will no longer be taken into account.
 
NORMAL OPERATIONS
DESCENT
 
10 000 FT FLOW PATTERN
Applicable to: ALL
10 000 ft FLOW PATTERN
 
 
NORMAL OPERATIONS
DESCENT
 

 
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NORMAL OPERATIONS
HOLDING
 
PREFACE
Applicable to: ALL
Whenever holding is anticipated, it is preferable to maintain cruise level and reduce speed to green dot, with ATC clearance, to minimize the holding requirement. As a rule of thumb, a M 0.05 decrease during one hour equates to 4 min hold. However, other operational constraints might make this option inappropriate.
A holding pattern can be inserted at any point in the flight plan or may be included as part of the STAR. In either case, the holding pattern can be modified by the crew.
HOLDING SPEED AND CONFIGURATION
Applicable to: ALL
If a hold is to be flown, provided NAV mode is engaged and the speed is managed, an automatic speed reduction will occur to achieve the Maximum Endurance speed when entering the holding pattern. The Maximum Endurance speed is approximatively equal to Green Dot (it can be between Green Dot and Green Dot +10 kt, depending on aircraft weight and flight conditions) and provides the lowest hourly fuel consumption.
If the Maximum Endurance speed is greater than the ICAO or state maximum holding speed, the crew should select flap 1 below 20 000 ft and fly S speed. Fuel consumption will be increased when holding in anything other than clean configuration and Maximum Endurance speed.
IN THE HOLDING PATTERN
Applicable to: ALL
The holding pattern is not included in the descent path computation since the FMGS does not know how many patterns will be flown. When the holding fix is sequenced, the FMGS assumes that only one holding pattern will be flown and updates predictions accordingly. Once in the holding pattern, the VDEV indicates the vertical deviation between current aircraft altitude and the altitude at which the aircraft should cross the exit fix in order to be on the descent profile.
　
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本文鏈接地址：A330/A340 機組訓練手冊 FCTM Flight Crew Training Manual 1(61)