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Flight Management System (FMS) for the Agusta AW139/AB139 Helicopter
Clearing of Flight Plans -- After landing (plus a 15 second time
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delay), the CLEAR FPL prompt is displayed on the active flight plan
page. Selecting this prompt clears the entire active flight plan. The
FMS defines landing as when ground speed is below 50 kts, CAS
is below 80 ks, and weight--on--wheels (WOW) is true.
A stored flight plan is activated while on the ground or in flight.
However, the pilot must confirm the present active flight plan is being
replaced. Flight plans are also cleared one waypoint at a time using
the DEL key on the multipurpose control display unit (MCDU).
While on the ground, a new origin is entered after some or all of the
flight plan has been defined. When the new origin is already a
waypoint in the flight plan, the waypoints earlier than the new origin
are deleted. When the new origin is not already a waypoint in the
flight plan, the whole flight plan is deleted. Deleting the origin clears
the entire flight plan. This applies to both active and stored flight
plans.
Changing the database cycle (NAV IDENT page, line select key 2R)
clears the active flight plan. This rules out any discrepancies
between flight plan information and the new database cycle. The
database cycle is changed only on the ground.
LATERAL NAVIGATION
LNAV is the function in the FMS that sends commands to the flight
guidance computer to laterally steer the aircraft.
General LNAV Rules
The FMS must be selected as the navigation source.
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A minimum of one leg must be defined for LNAV calculations.
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LNAV is available for all phases of flight.
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LNAV bank angles do not exceed 25_ except in holding, procedure
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turns, orbit patterns, and on arc legs. For these cases, the limit is 30_.
LNAV roll rate is 3_ per second during the en route phase of flight
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and 5.5_ per second on the approach.
The distance shown for each leg of the flight plan accounts for the
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distance traveled due to the changing in course from one leg to the
next.
LNAV uses up to the limits of bank angle to stay within protected
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airspace.
Flight Plan
7-22
Honeywell International Inc. Do not copy without express permission of Honeywell.
A28- - 1146- - 181
REV 3 Mar 2009
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