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Flight Management System (FMS) for the Agusta AW139/AB139 Helicopter
Automatic Speed Command -- The automatic speed command is
D
the current speed being output by the FMS for control of the aircraft.
The automatic speed command is also referred to as automatic
speed target in this guide.
Top- -of- -Climb (TOC) -- A TOC waypoint is calculated and
D
displayed on the vertical profile and shown on the PROGRESS
2 page. However, the TOC waypoint is not in the active flight plan.
Only one TOC waypoint is permitted at a time. The TOC is
calculated based on current aircraft altitude, climb speed, and the
cruise altitude.
Initial Cruise Altitude -- The initial cruise altitude is used by the
D
FMS to determine the altitude where the cruise phase of flight
commences. On reaching this altitude, the FMS changes the speed
command from climb to cruise when the aircraft levels at the initial
cruise altitude or higher. The initial cruise altitude is set during
performance initialization on PERFORMANCE INIT 2/3 page.
When the cruise altitude is entered as a value other than an
increment of a thousand feet, the FMS rounds off the entered
altitude by a thousand feet. For example, when the INIT CRZ ALT
target is 2500 ft, the aircraft levels off at 2000 ft. The FMS rounds
initial cruise altitude and baro altitude to the nearest thousand feet
to determine flight phase.
Cruise Altitude -- Cruise altitude is the current altitude used by the
D
FMS to plan the cruise portion of the flight. Initially, the cruise altitude
is set equal to the entered initial cruise altitude. The cruise altitude
is automatically adjusted by the FMS using the altitude preselector
settings. When the aircraft levels at the cruise altitude, the FMS
changes to the cruise phase of flight with the corresponding cruise
speed commands.
Top- -of- -Descent (TOD) -- A TOD waypoint is calculated and
D
displayed on the vertical profile and shown on PROGRESS page 2.
With no constraints during the descent, the TOD is calculated using
the destination elevation (when available) and the descent speed
schedule. With constraints during the descent, the TOD is
calculated using the path mode. One minute before the TOD point
is reached, a vertical track alert is given. An automatic descent is
initiated at the TOD when the following are true:
— The altitude preselector is set to a lower altitude
— The FMS is selected as the navigation source
— LNAV and VNAV are engaged.
Flight Plan
7-8
Honeywell International Inc. Do not copy without express permission of Honeywell.
A28- - 1146- - 181
REV 3 Mar 2009
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