©1999 Navia Aviation AS 21833-3.4 Periodic maintenance CAT I and II
OPERATING MANUALNORMARC 7013
INSTRUMENT LANDING SYSTEM
6-9
Use the Local Display and Keyboard or the RMM Program to display the measured values
for DS DDM.
• Increase DDM from the generator slowly above nominal value until a point where the letter
A (indicates that monitor has an ALARM for the displayed parameter) is shown beside the
measured parameter for Monitor 1.
• Check the new generator DDM value with the Field Test Set.
• Record in Table 6-15 line d).
• Decrease DDM from the generator slowly below nominal value until a point where the letter
A (indicates that monitor has an ALARM for the displayed parameter) is shown beside the
measured parameter for Monitor 1.
• Check the new generator DDM value with the Field Test Set.
• Record in Table 6-15 line dd).
Repeat the procedure for Monitor 2.
6.4.5.5 NF DDM ALARM
Apply a test signal from the RF Signal Generator to the NF input connector in the back of the
cabinet.(Disconnect first the signal cable from the Near Field Antenna). Adjust the signal to
the same RF level and frequency as the normal signal applied to the monitor.
Modulation shall be: 0.0% DDM, 40.0% SDM.
Verify modulation setting (DDM, SDM) by checking the test signal with the Field Test Set.
Use the Local Display and Keyboard or the RMM Program to display the measured values
for NF DDM
• Change DDM from the generator slowly towards 150 Hz dominance until a point where the
letter A (indicates that monitor has an ALARM for the displayed parameter) is shown
beside the measured parameter for Monitor 1.
• Check the new generator DDM value with the Field Test Set.
• Record in Table 6-15 line e).
• Change DDM from the generator slowly towards 90 Hz dominance until a point where the
letter A (indicates that monitor has an ALARM for the displayed parameter) is shown
beside the measured parameter for Monitor 1.
• Check the new generator DDM value with the Field Test Set.
• Record in Table 6-15 line ee).
Repeat the procedure for Monitor 2.
6.4.5.6 CLR DDM ALARM
Apply a test signal from the RF Signal Generator to the CLR input connector in the back of the
cabinet.(Disconnect first the signal cable from the Monitor network). Adjust the signal to the
same RF level and frequency as the normal signal applied to the monitor.
Modulation shall be: Same as commisioned values DDM and SDM from CLR output of Moni-
tor network.
Verify modulation setting (DDM, SDM) by checking the test signal with the Field Test Set.
Use the Local Display and Keyboard or the RMM Program to display the measured values
for CLR DDM.
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