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Flight Management System (FMS) for the Agusta AW139/AB139 Helicopter
Automatic
As the name implies, the automatic speed command mode is the most
automated mode. The FMS automatically changes the speed
command throughout the flight to accommodate aircraft configuration
and phase of flight. This automatically controlled speed command is
used by the autopilot or autothrottle. The following speed schedules for
the automatic speed command are configured on the PERFORMANCE
INIT 2/4 page:
Departure
D
Climb
D
Cruise
D
Descent
D
Approach
D
Go--around.
D
The automatic speed command for a typical flight changes as follows:
During departure, the speed command is set to the departure speed
D
schedule selected during initialization. The departure speed
schedule is designed to maintain the aircraft speed below the
class D airspace speed limit of 200 KIAS (knots indicated airspeed).
The default departure area is 4 NM from the departure airport and
less than 2500 ft AGL (above ground level).
Once the aircraft is clear of the departure area, the speed command
D
transitions to the climb speed schedule selected during initialization.
The climb speed command is limited by the speed/altitude limit
defined during initialization. Once above the speed/altitude limit, the
target is the lower value of the CAS/MACH climb speed schedule.
Changing to MACH is automatic.
As the aircraft levels off at the cruise altitude, as defined in the
D
initialization, the speed command changes to cruise. Only one value
of CAS or MACH is displayed.
NOTE:
The speed command transitions to cruise when the
aircraft is in VALT or altitude hold and the aircraft altitude
equals the PERFORMANCE INIT cruise altitude. When
the aircraft levels off at an altitude below the
PERFORMANCE INIT value for cruise altitude, the speed
command continues to be the climb speed command.
Manually entering the lower cruise altitude on the PERF
INIT 3 page is necessary to enable the FMS to transition
to the cruise speed command.
Flight Plan
7-50
Honeywell International Inc. Do not copy without express permission of Honeywell.
A28- - 1146- - 181
REV 3 Mar 2009
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