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December 01, 1999
747 Operations Manual
Flight Management, Navigation -
FMC Cruise
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.42.3
• XXXKT – fixed CAS cruise speed
• M.XXX – fixed Mach cruise speed
• CRZ CLB or CRZ DES – cruise climb or descent
• LRC – long range cruise selected
• E/O – engine out mode selected
• E/O LRC D/D – long range cruise drift down displays when EO selected
and the airplane altitude is above the maximum altitude for engine out
performance
Fixed cruise speeds are for:
• a flight crew selected speed (SEL SPD)
• a speed restriction associated with an altitude
• waypoint speed constraints
2 Cruise Altitude (CRZ ALT)
Displays cruise altitude entered on the PERF INIT page.
Valid entries are: XXX, XXXX, XXXXX, or FLXXX. Altitude displays in feet or
flight level depending on the transition altitude.
A new entry changes the page title to CRZ CLB or CRZ DES.
Changing the MCP altitude and pushing the Altitude selector enters the MCP
altitude as the active cruise altitude, without creating a modification.
3 Economy Speed (ECON SPD), Selected Speed (SEL SPD)
Displays the command speed or Mach.
Valid entries are CAS or Mach.
SEL SPD - displays when flight crew enters speed.
LRC - displays when LRC selected.
4 N1
Displays N1 to maintain level flight at command airspeed.
5 STEP SIZE
Displays climb altitude increment used by FMC to calculate optimum step climb.
Defaults to ICAO.
Valid entries are 0 to 9000 feet in increments of 1000 feet.
6 Economy (ECON)
Push – selects economy cruise speed.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
11.42.4 D6-30151-425
Flight Management, Navigation -
FMC Cruise
Displays when speed or Mach entered manually; or, when LRC selected.
7 STEP TO Altitude
Displays calculated step climb altitude based on STEP SIZE. May be overwritten
with manual entry above CRZ ALT.
Valid entry is FLXXX or XXX (flight level), or XXXXX (feet).
Displays STEP TO altitudes entered on LEGS page. These altitudes may be
greater or less than CRZ ALT and cannot be overwritten on the CRZ page.
Blank when no active flight plan or when within 200 miles of T/D.
Note: Calculated STEP TO altitude is always higher than OPT altitude.
When using ICAO STEP SIZE, the STEP TO altitude is the next higher
altitude above OPT altitude corresponding to the direction of flight
determined by the CRZ ALT entered before takeoff. For example: with an
ICAO STEP SIZE, a CRZ ALT of FL280 entered before takeoff, and an
OPT altitude of FL337; the STEP TO altitude will be FL350. In-flight
changes to CRZ ALT will not affect the calculation of STEP TO altitudes
when using ICAO step size. However, if an alternate route (for example,
Route 2) is activated in flight, the hemispheric altitude will be calculated
based on the current CRZ ALT.
When using an altitude increment STEP SIZE, the STEP TO altitude is the
next higher altitude above OPT altitude calculated by adding the STEP
SIZE increment to the current CRZ ALT.
8 AT
Displays ETA and distance to go to the optimum step point where a climb to the
STEP TO altitude minimizes either trip cost (ECON CRZ) or fuel (other CRZ
speeds).
Displays NOW passing the optimum step climb point.
Line title changes to AVAIL AT when STEP TO altitude entered at a waypoint on
the LEGS page and MAX altitude at the waypoint is less than the STEP TO
altitude. AVAIL AT indicates where MAX altitude will be equal to the STEP TO
altitude.
Line title changes to TO T/D within 200 miles of T/D. ETA and distance are to
T/D.
December 01, 1999
747 Operations Manual
Flight Management, Navigation -
FMC Cruise
Copyright © The Boeing Company. See title page for details.
D6-30151-425 11.42.5
9 Destination ETA/FUEL
Estimated time of arrival and calculated fuel remaining at the destination
assuming step climbs are made at optimum points to the STEP TO altitude.
　
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