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Antenna Switching Unit (ASU)............................................... A-2
Global Data Transfer Unit...................................................... A-2
DISPLAYS................................................................................ A-3
AFIS Access .......................................................................... A-3
AFIS Menu Page............................................................... A-4
Messages .............................................................................. A-5
CREATE MESSAGE Page ............................................... A-5
EDIT MESSAGE TEXT Page ........................................... A-6
READ MESSAGE Page.................................................... A-7
Terminal Weather .................................................................. A-8
TERMINAL WEATHER LIST Page................................... A-8
TERMINAL WEATHER Page ........................................... A-9
SIGMETS............................................................................... A-10
REQUEST SIGMETS Page.............................................. A-10
SIGMETS Page ................................................................ A-11
Winds Aloft............................................................................. A-12
WINDS ALOFT LIST Page ............................................... A-12
WINDS ALOFT Page........................................................ A-13
AFIS Flight Plan..................................................................... A-14
FPL Page .......................................................................... A-14
DISK FPL LIST Page ........................................................ A-15
RECALL FPL Page........................................................... A-16
AFIS OPTIONS Page ....................................................... A-17
Appendix A
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INTRODUCTION
The purpose of this section is to acquaint users of Airborne Flight
Information System (AFIS) Weather Advisory Services with the
equipment, its capabilities, and its operation. AFIS services are
advisory only, as they contain elements provided by the National
Weather Service and information supplied by the pilot. Therefore, it
is the responsibility of the pilot in command to exercise reasonable
and prudent judgment in the use of these advisory services.
Description
AFIS is an Airborne Flight Information System which interfaces with
the FMS. The interface consists of three major capabilities:
1. Access to ground based Global Data Center computers from a
portable terminal for the purpose of retrieving current aviation
weather.
2. Digital transfer of AFIS weather data into the FMS system for
display on the FMS.
3. Air/ground computer link interfacing the FMS to the ground
based Global Data Center computers for the purpose of
providing enroute weather updates.
AFIS interfaces with ACARS (Airborne Communications Addressing
and Reporting System) to provide the computer data link between
the aircraft and the Global Data Center. This is a VHF computer link
which provides excellent coverage within the continental United
States above Flight Level 200. Below this flight level, data link
coverage may be expected to deteriorate. Many variables, including
the amount of processing time at the GDC, affect the turnaround
time for an update. Depending on the nature of the update request,
the pilot should expect a turnaround time of five to ten minutes.
AFIS consists of the following components: Global Data Center
(GDC), Data Management Unit (DMU), and an optional Antenna
Switching Unit (ASU).
Appendix A
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Global Data Center (GDC)
The Global Data Center (GDC) is a ground based computer facility
built and operated by Global Systems for the purpose of providing
aviation weather and message forwarding services to AFIS
operators on a subscription basis. The GDC communicates with the
operator via data quality telephone lines to the Global Portable
Computer and via the ARINC ACARS network directly to the aircraft
in flight.
COMPONENTS
Data Management Unit (DMU)
The DMU incorporates a data quality VHF transceiver. This radio is
tuned automatically by the DMU computer to the appropriate ground
station for the purpose of transmitting data to and receiving data
from the Global Data Center while in flight.
Antenna Switching Unit (ASU)
The Antenna Switching Unit (ASU) is required for those installations
where the DMU transceiver shares an existing VHF communications
antenna. The ASU switches the transmit side of the antenna
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