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Flight Management System (FMS) for the Agusta AW139/AB139 Helicopter
For GPS equipped aircraft, the GPS is used for all phases of flight
(departure, en route, oceanic, terminal, and approach). While the GPS
is available and valid for navigation, the radios and AHRS positions are
not used in computing the FMS position. When the GPS becomes
unusable for navigation, the FMS uses the available sensor with the
lowest EPU for navigation.
Because of limits on the use of navaids, approaching controlled
airspace is possible for the aircraft before returning to radio updating.
The pilot must assess the FMS position before entering controlled
airspace. FMS position assessment is done by checking the navigation
mode on PROGRESS page 1 and cross--checking FMS position with
raw VOR/DME information. The PPOS DIRECT crossing points page
assists in cross--checking by giving the FMS bearing and distance to
the selected station and comparing that to raw VOR/DME data.
The POS SENSORS page, shown in Figure 6--48, is selected from the
NAV INDEX page or the POSITION INIT page. Sensors are grouped
by type and listed in numerical order. A U adjacent to the sensor position
indicates the sensor is used for navigation.
Figure 6- -48
POS SENSORS 1/1
Using the POS SENSORS page, updating the FMS position
(UPDATE), and examining sensor positions and status (STATUS) is
possible. The POS SENSORs page is also used to determine which
sensors are being used by the FMS for computing the aircraft position.
From the POS SENSORS page, the pilot can remove sensors from
being used for position updating (refer to Procedure 6--8).
A28- - 1146- - 181
Navigation
6-62
REV 3 Mar 2009
Honeywell International Inc. Do not copy without express permission of Honeywell.
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