User's Manual

Model 1150A DVOR
Rev. - November, 2008
This document contains proprietary information and such information may not be disclosed
to others for any purposes without written permission from SELEX Sistemi Integrati Inc.
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3.6.8.6.2
Fault Isolation Test Results
The VOR Fault Isolation screen is shown in Figure 3-55. This screen shows the results of the most recent Fault
Isolation Test. Pressing the “Run Full Diagnostic”, which is only available in Local Mode from Security Level 3 or
higher, causes the system to execute the complete built-in diagnostics. This requires the system to be NOTAM’d off.
Pressing the “Run On Air Diagnostics”, which is available either locally or remotely from Security Level 2 or
higher, causes the system to execute a subset of the full diagnostics that does not require the system to be NOTAM’d
off. Once started, the diagnostics can be canceled by the user with the “Cancel” button. The results are shown in the
Fault Results window at the bottom of the screen.
SAFETY CRITICAL NOTE
The DVOR Run Full Diagnostics check changes the radiated signal and a NOTAM MUST
be issued to notify that the DVOR is not in service during this test. Per ICAO State letters,
conducting this type of DVOR test is an HMI event. (HMI = Hazardously Misleading
Information). When HMI is intentionally produced, ICAO requires that the NOTAM text
contain information that conveys to the flight crew that the signals are not only “out of
service”, but may be unsafe to use, even though they may appear normal.
Figure 3-55 VOR Fault Isolation Screen