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Flight Management System (FMS) for the Agusta AW139/AB139 Helicopter
— Arming of VGP Mode: The first step towards using the VGP
mode is to arm VGP. This is done when the aircraft is within
30 nautical miles (NM) of the destination. VGP is armed by
selecting the APP (approach) button on the guidance panel.
However, the following conditions are necessary for arming the
VGP mode.
FMS is the selected navigation source.
D
A nonlocalizer based approach is selected from the
D
navigation database.
The aircraft is not in DR (dead reckoning) mode.
D
The aircraft is within 30 NM of the destination.
D
A NDB angle to the MAP exists.
D
Altitude and angle constraint values from the NAV DB have
D
not been changed.
When an at--altitude constraint is on the FAF (final approach
D
fix), the aircraft must be in ALT hold at the FAF altitude.
No vertical direct--to the MAP has been executed.
D
— Engagement of VGP Mode: The VGP mode is engaged when
the following rules are met.
The VGP mode is armed (by the selection of APP button and
D
meeting the conditions mentioned in the previous section).
LNAV is active.
D
The aircraft, when holding, must be established on the
D
inbound course to the FAF.
The active waypoint is the FAF or along track distance to the
D
FAF is less than 5 NM.
The aircraft is able to capture the final approach slope.
D
With a course reversal hold leg (HF) on the FAF, the aircraft
D
must be established inbound to the FAF (< 0.5 NM cross track
error and < 10 degrees track error on inbound leg) and be
exiting the hold.
Once the VGP is engaged, the crew does not need to set the
preselector altitude to the MDA. The crew can dial the preselector
altitude to the missed approach altitude. The FMS does not consider
the preselector altitude in computations while in VGP mode. The
message RESET ALT SEL? is suppressed in VGP mode.
Flight Plan
7-26
Honeywell International Inc. Do not copy without express permission of Honeywell.
A28- - 1146- - 181
REV 4 Aug 2010
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