Honeywell !!!!#f#.’E
4. C. (1) (c) Takeoff Calculations
Following entry of the takeoff initialization data, the takeoff
calculations are performed. Takeoff initialization data can be
changed after the calculation of the takeoff data.
If a change
is made, the takeoff data is removed from display until updated
to the change.
The following takeoff data are calculated and
displayed:
● Takeoff weight or most restrictive maximum takeoff weight
. Required takeoff field length (the longer of the
accelerate-go and the accelerate-stop (emergency) distances)
● Takeoff engine limit (EPR)
● Accelerate-go and
. Takeoff Speeds
- decision
speed
- decision speed
- rotation
speed
- safety speed -
steadv initial
accelerate-stop (emergency) distances
- V1
range - Vlmax, Vlmin*
-
Vr
V2
climb speed -
V4 (UK CAA only)
- final segment speed - Vfs -
-.
- single-engine speed - Vse
- reference speed (landing configuration) - Vref
* A choice of V1 between Vlmax and Vlmin, inclusively, is
permitted if the case is not field-length-limited. Vlmax
is the default value for
V1.
Once the takeoff initialization is complete, the takeoff
configuration comparison logic is active.
The configuration
comparison logic continuously compares the initialized
configuration for bleed air, ground spoilers, anti-skid, and
flap-position against the actual aircraft configuration.
Barometric altitude, pressure altitude, and outside air
temperature are also continuously compared against the
initialized conditions.
If the initialized configuration does
not match the actual configuration, the display of takeoff
speeds is confined to the CDU and glareshield-mounted display
controller. When the initialized configuration matches the
actual configuration, the takeoff speeds are available
for
display on the primary flight display
(PFD) from the avionics
standard communication bus (ASCB). When both engines are
advanced above 1.17 EPR and the configuration comparison logic
is satisfied, the logic is latched. This means that while the
logic is latched, the display of takeoff data is available from
the ASCB regardless of changes to the actual aircraft
configuration.
If both engines are reduced below 1.17 EPR, the
comparison logic is unlatched and is again active.
22-14-00
Page 298.167
Aug 15/91
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