IN THE HOLDING PATTERN
As the number of holding pattern to be flown can not be inserted in the FMGS, the hold distance is not included in the descent path computation. After the holding fix is sequenced, the FMGS assumes that only the current holding pattern will be flown and updates predictions accordingly. Once in the holding pattern the VDEV indicate the vertical deviation between current aircraft altitude and the altitude at which the aircraft should cross the exit to be on descent path. In DES mode, the aircraft descends at 1000 ft/min whilst in the holding pattern until reaching either the cleared altitude or altitude constraint to exit the holding pattern, select IMME EXIT .on leaving the hold, the speed will revert to managed descent speed. Selected speed may be required to avoid an undesired acceleration in the holding pattern, LAST EXIT UTC/FUEL information is displayed on the HOLD page these predictions are based on the fuel policy requirements specified on the FUEL PRED page with no allowance for extra fuel assuming the aircraft will divert following a missed approach. This information is computed with defined assumptions e.g. diversion routeing, flight level, Mach number and wind Deviation from these assumptions may affect the arrival fuel at the diversion airport
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