NORMARC 7013 - Page 94

OPERATING MANUAL
6-8
21833-3.4
NORMARC 7013
INSTRUMENT LANDING SYSTEM
Periodic maintenance CAT I and II ©1999 Navia Aviation AS
Use the Local Display and Keyboard or the RMM Program to display the measured values
for CL 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 a).
• 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 aa).
Repeat the procedure for Monitor 2.
6.4.5.2 CL SDM ALARM
The test setup is the same as in a).
Use the Local Display and Keyboard or the RMM Program to display the measured values
for CL SDM
• Increase SDM from the generator slowly until a point where the letter A (indicates that
monitor has an ALARM for the displayed parameter) is shown beside the measured param-
eter for Monitor 1.
• Check the new generator SDM value with the Field Test Set.
• Record in Table 6-15 line b).
• Decrease SDM from the generator slowly until a point where the letter A (indicates that
monitor has an ALARM for the displayed parameter) is shown beside the measured param-
eter for Monitor 1.
• Check the new generator SDM value with the Field Test Set.
• Record in Table 6-15 line bb).
• Repeat the procedure for Monitor 2.
6.4.5.3 CL RF ALARM
The test setup is the same as in a).
Use the Local Display and Keyboard or the RMM Program to display the measured values
for CL SDM.
• Decrease slowly RF level on the generator until a point where the letter A (indicates that
monitor has an ALARM for the displayed parameter) is shown beside the measured param-
eter for Monitor 1.
• Record the RF level reading at alarm point in Table 6-15 line c).
Repeat the procedure for Monitor 2.
6.4.5.4 DS DDM ALARM
Apply a test signal from the RF Signal Generator to the DS 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: 15.5%DDM, 40.0%SDM.
Verify modulation setting (DDM, SDM) by checking the test signal with the Field Test Set.