System Description; Introduction - Honeywell FMZ Series Pilot's Manual

Flight Management System (FMS) for the Agusta AW139/AB139 Helicopter
2.

System Description

INTRODUCTION

The flight management system (FMS) has two primary functions and
multiple secondary functions. The primary functions are position
computation and flight planning. These functions work with the
associated guidance in the lateral axis. The navigation database (NDB)
contained in the FMS is essential to these functions. The database is
used to store waypoints, navaids, airways, procedures, airports, and
other navigation data.
The FMS connects to a variety of short range and long range navigation
sensors. The primary short range sensors are very high frequency
omnirange/distance measuring equipment (VOR/DME) and( DME/DME).
Long--range sensors include attitude and heading reference system
(AHRS) and global positioning system (GPS). Using the available
sensors, the FMS develops a position based on a blend or mix of sensor
inputs. Based on the position and the flight plan, the FMS generates
information to be displayed on the multifunction control display unit
(MCDU) and electronic display system (EDS).
The lateral navigation function of the FMS calculates navigation
information relative to selected geographical points. The pilot can
define flight plan routes worldwide. The system outputs advisory
information and steering signals that show the pilot or PRIMUS EPIC
how to guide the aircraft along the desired route. Routes are defined
from the present position of the aircraft to a destination waypoint along
a great circle route or through a series of great circle legs defined by
intermediate waypoints.
The FMS is resident in one of the the processor modules in the modular
avionics unit (MAU), as shown in Figure 2--1. A primary purpose of the
FMS is to manage navigation sensors to produce a composite position.
Using the composite position, along with flight planning capabilities, the
FMS controls lateral navigation, performance, and guidance work
throughout the flight. The FMS interfaces primarily with the following
components:
Multifunction control display unit (MCDU)
D
Modular avionics unit (MAU).
D
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REV 3 Mar 2009
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System Description
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