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GNS 400W Series Maintenance Manual
Page 4-49
190-00356-05
Rev. A
Flag Sensitivity
NOTE
A NAV +FLAG output voltage of greater than 260 millivolts fully conceals the
indicator flag (OUT OF VIEW) and a NAV +FLAG output voltage of less than
125 millivolts fully reveals the indicator flag (IN VIEW).
The NAV +FLAG output must not be less than 260 millivolts when measured at the NAV
+FLAG J6-3 and NAV -FLAG (NAV COMMON) J6-4 outputs with a Standard VOR Test Signal
at 108.00 mHz or a Standard Localizer Test Signal at 108.10 mHz.
The NAV +FLAG output must not be less than 260 millivolts when measured at the NAV
+FLAG J6-3 and NAV -FLAG (NAV COMMON) J6-4 outputs with a Standard VOR Test Signal
at 108.00 mHz and the bearing error must be less than 3 degrees.
The NAV +FLAG output must not be less than 260 millivolts when measured at the NAV
+FLAG J6-3 and NAV -FLAG (NAV COMMON) J6-4 outputs with a Standard Localizer Test
Signal at 108.10 mHz. (Optional Test)
The NAV +FLAG output must not be more than 125 millivolts (Flagged) when measured at the
NAV +FLAG J6-3 and NAV -FLAG (NAV COMMON) J6-4 outputs with a Standard Localizer
Test Signal at 108.10 mHz when the RF level is lowered to the Flag threshold level such that it
causes the course deviation output (NAV +LEFT) to be less than 50% of standard deflection.
50% of standard deflection in LOC mode is 45 millivolts. Flag threshold deflection percentage
must be greater than 50%.
The NAV +FLAG J6-3 output with respect to the NAV –FLAG (NAV COMMON) J6-4 output
must not be less than 260mV with a Standard VOR Test Signal at 108.00 mHz at a level of –
106.5 dBm. These same outputs must be 0
±
25mV with a Standard VOR Test Signal at 108.00
mHz at a level of –115.00 dBm.
Verify the following: Apply a -103.5 dBm RF level applied to the RF input and verify the
requirements listed above.
VOR Course Deviation Sensitivity
The magnitude of the course deviation output must not be less than 60% (90 millivolts) of the
nominal output (150 millivolts) measured at the NAV +LEFT J6-5 and NAV +RIGHT (NAV
COMMON) J6-6 outputs with a Standard VOR Deviation Signal at 108.00 mHz.
The magnitude of the course deviation output must be 0
±
45mV measured at the NAV +LEFT J6-
5 and NAV +RIGHT (NAV COMMON) J6-6 outputs with a
–106.5 dBm RF level Standard VOR Deviation Signal at 108.00 mHz with OBS and signal
generator bearings set to 150 degrees ‘FROM’.
The receiver sensitivity must meet the following requirements with a -103.5 dBm RF level
applied to the RF input:
