OPERATIONS MANUAL

FMS
DESCENT FORECAST Page:
1L
2L
3L
4L
5L
6L
Access:
• 5R on VNAV DES
• 2L on FMC COMM 1/2
General:
The FMC uses the forecast data in the
calculation of the T/D for an idle descent
to the first waypoint constraint. The
EXEC key is not required on this page.
1L TRANS LVL
Shows the transition level for the arrival.
When no manual entry exists, shows the
transition level for the arrival loaded from
the database. Shows FL180 when no manual
and no database entry exists. The FMC uses
the transition level as a reference for the
altitude indications in the arrival section of
the route; they are accordingly shown in feet
format or flight level format. It is also used
for descent path calculations (true heights
of altitude constraints above the transition
level vary with barometric pressure), and
for the QNH/STD altimeter switch-over
advisory on the PFDs during arrival.
Valid entries
Altitude (-1005 to 32005 ft):
XXX
XXXX
XXXXX
FLXXX
2L 3L 4L 5L ALT
Allows the crew to enter an altitude with
reference to the forecast wind entry on
the right-hand side of the respective line.
Altitude entries are automatically sorted,
with the highest altitude shown in 2L.
Valid entries
Altitude (-1005 to 45100 ft):
XXX
XXXX
XXXXX
FLXXX
6L or