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Flight Management System (FMS) for the Agusta AW139/AB139 Helicopter
The navigation database does not have step down waypoints
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between the FAF and MAP when the VNAV path satisfies the step
down restrictions. VNAV path guidance and a cross check with other
navigation aids are the only assurance that all descent path
restrictions are met. Using modes other than FMS VNAV guidance
information are desirable for some approaches.
Refer to the GPS for information on GPS RAIM (receiver
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autonomous integrity monitoring) for GPS only approaches.
Approaches in the navigation database consist of localizer--based
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approaches and nonprecision approaches. The FMS is certified to
fly all nonprecision approaches (GPS, NDB, VOR/DME, VOR,
RNAV, NDBDME, DME/DME). Approaches from the database can
contain DME arcs. The FMS flies the arc as specified in the
approach. In some cases, clearance to intercept the arc other than
specified in the approach is given.
The FMS cannot be used to fly localizer approaches (ILS, LOC, BC
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(back course), SDF, LDA, IGS (instrument guidance system),
DGPS (differential global positioning system)). These approaches
are flown by displaying the localizer data and by using the flight
director/autopilot. However, these procedures are selected and
activated on the FMS to enhance situational awareness. The FMS
shows the approach on the EFIS map displays. The FMS is used to
fly the approach transition and the missed approach phases of
precision approaches. When the approach transition is in the active
flight plan, and the radios are in AUTOTUNE, the FMS can autotune
the localizer frequency on the leg to the final approach course. When
the approach transition is in the active flight plan and the radios are
in VOR (V), the FMS autotunes the localizer when the direct
distance from the aircraft to the destination is 25NM or less and the
flight plan distance from the aircraft to the destination is 75NM or
less.
An approach is selected with or without an approach transition. For
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example, when receiving vectors to the final approach course, an
approach transition need not be selected with the approach. The
pilot flies the specified vectors and arms LNAV. The FMS
automatically captures the final approach course.
The altitude selector is observed while in VNAV during all phases of
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flight, including the approach phase. The altitude selector must not
be set below the published MDA until the runway is visible and the
approach is able to be made.
A28- - 1146- - 181
REV 3 Mar 2009
Honeywell International Inc. Do not copy without express permission of Honeywell.
Navigation
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