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Example of SEC F-PLN use during cruise
NORMAL OPERATIONS
CRUISE
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_20-60-50 SECONDARY FLIGHT PLAN for further information
For diversion purpose, the crew can also use the CLOSEST AIRPORT page which provides valuable fuel/time estimates to the four closest airports from the aircraft position, as well as to
an airport the crew may define. The fuel and time predictions are a function of the average wind between the aircraft and the airport.
MISCELLANEOUS
If ATC requires a position report, the crew will use the REPORT page which can be accessed from PROG page.
If ATC modifies the routing, the crew will revise the F-PLN. Once achieved, the crew may perform a new F-PLN print.
If ATC requires to report on a given radial, the crew will use the FIX INFO page which can be accessed from a lateral revision on F-PLN page at PPOS.
If ATC requires a report at a given time, the crew will insert a time marker pseudo waypoint.
If there is weather, the crew will use the OFFSET function which can be accessed from a lateral revision at PPOS. The crew will determine how many NM are required to avoid the weather. Once cleared by ATC, the crew will insert the offset.
If ATC gives a DIR TO clearance to a waypoint far from present position, the crew will use the ABEAM facility. This facility allows both a better crew orientation and the previously entered winds to be still considered.
COST INDEX
Applicable to: ALL
The Cost Index (CI) is used to take into account the relationship between fuel and time related costs in order to minimize the trip cost. The CI is calculated by the airline for each sector. From an operational point of view, the CI affects the speeds (ECON SPEED/MACH) and cruise altitude (OPT ALT). CI=0 corresponds to maximum range whereas the CI=999 corresponds to minimum time.
The CI is a strategic parameter which applies to the whole flight. However, the CI can be modified by the crew in flight for valid strategic operational reasons. For example, if the crew needs to reduce the speed for the entire flight to comply with curfew requirements or fuel management requirements (XTRA gets close to 0), then it would be appropriate to reduce the CI.
The SEC F-PLN can be used to check the predictions associated with new CI. If they are satisfactory, the crew will then modify the CI in the primary F-PLN. However, the crew should be aware that any modification of the CI would affect trip cost.
NORMAL OPERATIONS
CRUISE
SPEED CONSIDERATIONS
Applicable to: ALL
The cruise speed may be either:
? Managed
? Selected
MANAGED
When the cruise altitude is reached, i.e. "ALT CRZ " on the FMA, the A/THR operates in SPEED/ MACH mode. The optimum cruise Mach number is automatically targeted. Its value depends on:
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A330/A340 机组训练手册 FCTM Flight Crew Training Manual 1(53)
