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time operational capability within five (5) minutes (MAXINIT) after the
restoration of the facility power sources.
During initialization wind and windshear alert information is not displayed on
the Text Displays (AAD).
2.1.12.5 Off
No power is being provided to the master station controller.
The Text Displays shall indicate that they are no longer receiving data from the
LLWAS master station.
2.2 Configuration File
All MetConsole stations are configured through a single shared configuration
database. This database file contains configuration information pertaining to
the role of each station on the network (primary server, secondary server,
archiving PC, SPES workstation, operator workstations, displays etc). In
addition, the configuration database contains LLWAS parameters contained in
the ACF, SPES thresholds & parameters, DCF configurations and other
configuration data.
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LLWAS
Low Level Windshear Alert System
Figure 17 - LLWAS System Configuration (Typical)
The advantage of this shared configuration database approach is that systemwide
configuration can be achieved through reconfiguration of a single
central source file. The configuration database is centrally stored and changes
to this file are automatically integrated by MetConsole instances operating
across the network.
MetConsole operates through ODBC, Microsoft’s Open Database Connectivity
technology. ODBC makes the choice of database dependant only on system
requirements. Microsoft Access can be used; likewise Oracle 8, SQL Server 7
and other technologies can be used. The configuration database is accessible
using common tools (i.e. Microsoft Access) and providing a simple and easy to
learn interface for all users.
This open architecture does not limit the MetConsole system to any single
database technology. This advantage allows Almos MetConsole users to
operate a database that best suits their unique individual requirements, rather
than a single database that is not perfectly suited to their situation.
The final database format is yet to be determined; the final database format
will be chosen based on the overall performance of the system and will be
formally tested and approved at the Factory Acceptance Test.
Changes to ACF (Airport Configuration File) and DCF (Display Configuration
File) are implemented directly in the configuration database, which is in turn
secured via Windows NT security (only accessible from the master station to
authorized users). Facilities are provided for the import of these files, allowing
easy implementation of future siting changes.
SYSTEM CONFIGURATION (SCF) and
MAINTENANCE CONFIGURATION
(MCF) (Averaging constants,
Displays, Parameters, etc)
AIRPORT CONFIGURATION FILE
(ACF)
DISPLAY CONFIGURATION FILE
CONFIGURATIO
DATABAS
(METCFG.MDB
AAD DISPLAY
SYSTEM
INPUT DEVICE
ARCHIVE STATION
KEYBOAR
D &
MOUSE
AAD DISPLAY
SYSTEM
INPUT DEVICE
AAD DISPLAY
SYSTEM
INPUT DEVICE
RAW CONFIGURATION FIL ES
& PARAMETER S
SHARED
(BOTH
LLWAS MetConsole
Overvie
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LLWAS
Low Level Windshear Alert System
2.2.1 ACF
The Airport Configuration File (ACF) shall be created by Almos Systems based
on the results of the Site Survey and expertise and software from NCAR. This
procedure has already been successfully performed at two Phase III LLWAS
Installations.
2.2.2 DCF
A standard Display Configuration File (DCF) shall be created by Almos
Systems. This may be altered to suit the customers individual needs.
2.2.3 MCF, SCF
The MCF (Maintenance Configuration File) and SCF (System Configuration
File) are standard parts of the LLWAS Configuration database. They may be
altered but there is generally no need to do so.
3. Reliability, Maintability, Availability (RMA), and
Supportability
3.1 RMA Characteristics
This section describes Almos RMA performance, including but not limited to
Mean Time Between Failure(MTBF), Mean Time Between Corrective
Maintenance Action(MTBCMA), Mean Time Between Critical Failures(MTBCF),
Built in Test and Fault Isolation capability, Mean Time To Repair(MTTR), and
inherent availability.
3.1.1 Mean Time Between Failure (MTBF) / Mean Time Between Critical Failures
(MTBCF)
The equipment offered, including computer software, have been proven in a
number of airport installations. They are of high quality, off-the-shelf and
commercially available, and are capable of operating continuously with a high
　
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