Performance Initialisation
The performance initialisation page allows the entry of airplane and route data to initialise performance calculations. This data is required for VNAV operation.
GR WT - Airplane gross weight can be entered by the flight crew or calculated by the FMC after entry of zero fuel weight. Valid entry is thousands of kilograms with a decimal (hundreds) optional. Entering the zero fuel weight first displays calculated gross weight.
Entry of a value after takeoff speeds are selected removes the speeds and displays the scratchpad message TAKEOFF SPEEDS DELETED.
Entry of a value after takeoff speeds are selected removes the speeds and displays the scratchpad message TAKEOFF SPEEDS DELETED.
FUEL - Fuel on board displays when the fuel totaliser calculations are valid. The source for the display is included in the line:
SENSED - fuel quantity is from the totaliser
CALC (calculated) - fuel quantity is from FMC calculations. Manual entry is possible
MANUAL - fuel quantity has been manually entered. Manual entries blank the totaliser display on PROGRESS page 2
Valid entry is thousands of kilograms with a decimal (hundreds) optional. Only manual entries can be deleted. Deleting the manual entry resets the value to the totaliser and the title returns to CALC.
Valid entry is thousands of kilograms with a decimal (hundreds) optional. Only manual entries can be deleted. Deleting the manual entry resets the value to the totaliser and the title returns to CALC.
ZFW - Normally, ZFW is entered from the airplane dispatch papers and the FMC calculates the airplane gross weight. Valid entry is thousands of kilograms with a decimal (hundreds) optional.
Calculated zero fuel weight displays when airplane gross weight is entered first and fuel on board is valid.
Entry of a value after takeoff speeds are selected removes the speeds and displays the scratchpad message TAKEOFF SPEEDS DELETED.
Calculated zero fuel weight displays when airplane gross weight is entered first and fuel on board is valid.
Entry of a value after takeoff speeds are selected removes the speeds and displays the scratchpad message TAKEOFF SPEEDS DELETED.
RESERVES - Valid entry is thousands of kilograms with a decimal (hundreds) optional.
INDEX - Displays the INIT/REF INDEX page.
CRZ ALT - Cruise altitude can be entered by the flight crew or from a company route. Entered value is displayed on the CLB and CRZ pages.
COST INDEX - Cost index is used to calculate ECON climb, cruise, and descent speeds. Larger values increase the ECON cruise speed. Entering zero results in maximum range airspeed and minimum trip fuel. Cost index can be entered by the flight crew or from a company route. Valid entries are 0 to 9999.
CRZ CG - Used by FMC to compute maximum altitude and manoeuvre margin to buffet. Displays default centre of gravity in small font. A flight crew entered value displays in large font.
STEP SIZE - Displays the climb altitude increment used for planning the optimum climb profile. Default value is ICAO which provides a 2000 foot step below FL290 and a 4000 foot step above FL290.
Valid manual entries are 0 to 9000 in 1000 foot increments. In-flight entries are inhibited. In-flight step size changes are made on the CRZ page.
For a non-zero entry, performance predictions are based on step climbs at optimum points. For a zero entry, performance predictions are based on a constant CRZ ALT.
Valid manual entries are 0 to 9000 in 1000 foot increments. In-flight entries are inhibited. In-flight step size changes are made on the CRZ page.
For a non-zero entry, performance predictions are based on step climbs at optimum points. For a zero entry, performance predictions are based on a constant CRZ ALT.
TAKEOFF - Displays the TAKEOFF REF page.
Standard | 11.40.37 | TAKEOFF REF>