Takeoff
The takeoff phase begins with selection of TO/GA and extends to the thrust reduction altitude where climb thrust is normally selected.
Climb
The climb phase begins at the thrust reduction altitude and extends to the top of climb (T/C) point. The T/C point is where the airplane reaches the cruise altitude entered on the PERF INIT page.
Cruise
The cruise phase begins at the T/C point and extends to the top of descent (T/D) point. Cruise can include step climbs and en route descents.
Descent
The descent phase begins at the T/D point or when either a level change or vertical speed descent is initiated. The descent phase extends to the beginning of the approach phase.
Approach
The approach phase begins two miles from the first waypoint of a published approach or approach transition selected from the ARRIVALS page.
Flight Complete
After landing, the flight complete phase clears the active flight plan and load data. Some preflight data fields initialize to default values in preparation for the next flight.
FMC and CDU Terminology
The following paragraphs describe FMC and CDU terminology.
Active – flight plan information currently being used to calculate LNAV or VNAV guidance commands.
Activate – designating an entered route as the active route for navigation. It is a two step process:
.
push the ACTIVATE prompt
.
push the execute (EXEC) key. Altitude restriction – a crossing restriction at a waypoint. Delete – remove FMC data and revert to default values, dash or box prompts, or a
blank entry using the DELETE key.
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11.31.2 March 29, 2004
Flight Management, Navigation -Flight Management System Operation
737 Flight Crew Operations Manual
Econ – a speed schedule calculated to minimize operating cost. The economy
speed is based on the flight crew CDU–entered cost index. A low cost index
reflects high fuel costs and results in a lower cruise speed.
Enter – placing an entry into the CDU scratchpad and then line selecting the
information to the desired location. New characters can be typed, or existing data
can be line selected into the scratchpad.
Erase – removing flight crew–entered information, which has resulted in a
modification, by pushing the ERASE prompt.
Execute – making modified information part of the active flight plan by pushing
the EXEC key.
Inactive – route, climb, cruise, or descent information not currently being used to
calculate LNAV or VNAV commands.
Initialize – entering information required to make the system operational.
Message – information the FMC automatically writes in the scratchpad to inform
the flight crew of a system condition.
Modify – active data that is changed but not yet executed. When a modification is
made to the active route or performance mode, MOD is displayed in the page title,
ERASE appears next to line select key 6 left, and the execute key illuminates.
Prompt – CDU displays that aid the flight crew in accomplishing a task. Prompts
can be boxes, dashes, or a careted (< or >) line to remind the flight crew to enter
or validate information.
Select – pushing a key to obtain the desired information or action, or to copy
selected data to the scratchpad.
Speed restriction – an airspeed limit associated with a specified altitude or
waypoint.
Waypoint – a point on the route. It can be a fixed point such as a latitude and
longitude, VOR or ADF station, airway intersection, or a non–fixed point such as
a conditional waypoint. A conditional waypoint is not necessarily associated with
a land reference; it reflects a time position, or altitude requirement. An example
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