Air Traffic Management Concept Baseline Definition - The Boeing ...

The airlines and the FAA have recently established AOCNET to provide a means of
sending messages between the AOC center and the NAS primarily the central flow facility.
5.2.2.3 ATN
ATN provides not only air/ground communication but also ground/ground
communication. Two applications have been developed for ground/ground service. ATS
Interfacility Data Communication (AIDC) provides direct real-time messaging between
controllers, similar to CPDLC between pilots and controllers.
The second ATN ground/ground application is ATS Message Handling Service
(ATSMHS). Based on the X.400 Message Handling Service (e-mail) developed by the
International Telegraph and Telephone Consultative Committee, ATSMHS provides a
store-and-forward messaging service that is appropriate for sending flight plans and other
information that is unnecessary to send in real time.
5.3 Navigation
5.3.1 Navigation Functionality
The navigation functionality provides position determination, flight plan management,
guidance and control, display and system control, and fault configuration management.
Navigation functionality may be described in three layers of services (see Figure 5.7). The
Controls and Displays layer provides the interfaces between the flight crew and the
airplane systems. These include:
1. The Mode Control Panel, which provides coordinated control of the FMC, FD/AP and
altitude alert functions
2. The Electronic Flight Instruments’ Primary Flight Displays, which displays the flight
mode annunciation, and airspeed, attitude, altitude, vertical speed, and heading
indications
3. The Horizontal Situation Indicator, which displays flight path orientation and guidance
cues (bugs) on airspeed and Engine Pressure Ratio
4. The Control Display Unit, which enters the desired lateral and vertical flight plan
information into the FMC and displays the waypoints and path constraints stored
within the navigation database.
The processor layer integrates data from the air data, inertial reference, radio navigation,
engine and fuel sensors, navigation, performance and flight plan databases, and crewentered
data to navigate the airplane. The sensors layer provides the airplane state data
(i.e., position, velocity, acceleration, attitude) and navigation and guidance information.
This includes radio navigation sensors, such as Instrument Landing System (ILS) Glide
Slope and Localizer receivers or equivalent Microwave Landing System (MLS), Distance
Measuring Equipment (DME) or equivalent tactical air navigation (TACAN), Global
Positioning System (GPS), Inertial Reference System (IRS), Very-high frequency Omni
Range (VOR) receiver, Automated Direction Finder (ADF) and the air data sensors (pitot
static and temperature probes, angle of attack, etc.).
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