NORMAL OPERATIONS
CRUISE
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL
When at cruise FL, the AP altitude control is soft. This means that the AP will allow small altitude variation around the cruise altitude (typically ± 50 ft) to keep cruise Mach before a readjustment of thrust occurs. This optimizes the fuel consumption in cruise.
WIND AND TEMPERATURE
When reaching cruise FL, the crew will ensure that the wind and temperatures are correctly entered and the lateral and vertical F-PLN reflect the CFP. Wind entries should be made at waypoints when
there is a difference of either 30 ° or 30 kt for the wind data and 5 °C for temperature deviation. These entries should be made for as many levels as possible to reflect the actual wind and temperature profile. This will ensure that the FMS fuel and time predictions are as accurate as possible and provide an accurate OPT FL computation.
STEP CLIMB
If there is a STEP in the F-PLN, the crew will ensure that the wind is properly set at the first waypoint beyond the step (D on the following example) at both initial FL and step FL.
If at D waypoint, the CFP provides the wind at FL 350 but not at FL 310, it is recommended to insert the same wind at FL 310 as the one at FL 350. This is due to wind propagation rules, which might affect the optimum FL computation.
ETP
ETP function should be used to assist the crew in making a decision should an en-route diversion be required. Suitable airport pairs should be entered on the ETP page and the FMS will then calculate the ETP. Each time an ETP is sequenced, the crew should insert the next suitable diversion airfield.
The SEC F-PLN is a useful tool and should be used practically. The ETP should be inserted in the
SEC F-PLN as a PD (Place/Distance) and the route to diversion airfield should be finalized. By programming a potential en-route diversion, the crew would reduce their workload should a failure
occur. This is particularly true when terrain considerations apply to the intended diversion route. When an ETP is sequenced, the crew will
? Access the ETP page
? Insert the next applicable diversion airfield with associated wind
? Read new ETP
NORMAL OPERATIONS
CRUISE
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL
? Insert new ETP as a PD
? Copy active on the SEC F-PLN
? Insert the new diversion as New Dest in the SEC F-PLN from new ETP
The DATA/Stored Routes function in the MCDU can be used to store up to five possible diversion routes. These routes can be entered into the SEC F-PLN using the SEC INIT prompt. This prompt will only be available if the SEC F-PLN is deleted. Refer to FCOM/DSC-22_20-60-40 USING THE SECONDARY FLIGHT PLAN FUNCTION for further information.
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