OPERATING MANUAL
6-4
21833-3.4
NORMARC 7013
INSTRUMENT LANDING SYSTEM
Periodic maintenance CAT I and II ©1999 Navia Aviation AS
Nominal frequency: (Channel frequency + 5kHz) ±0.002%
Repeat the measurements for Course Tx2.
Record the frequency readings in Table 6-12.
6.4.1.2 Clearance Transmitter Frequency
Switch on Clearance Tx1.
• Connect the Frequency Counter to CSB CLR test connector in the Change Over Section
via a 50 ohm test cable. (Use 50 ohm input port of the counter)
• If necessary switch off the 90 Hz and 150 Hz modulation through the Local Display and
Keyboard or the RMM Program.
Nominal frequency: (Channel frequency - 5kHz) ±0.002%
Repeat the measurements for Clearance Tx2.
Record the frequency readings in Table 6-12.
6.4.2 LF Frequency check.
90/150 Hz MODULATION FREQUENCY checks
Switch on Course Tx1.
• Connect the Frequency Counter to CSB test connector on Course Tx1 Section via a 50
ohm test cable. (Use high impedance input port of counter)
• Turn off the 90 Hz modulation for Course Tx1 through the Local Display and Keyboard or
the RMM Program.
• Read the 150 Hz frequency. Tolerance ±0.05 Hz.
• Turn the 90 Hz modulation on and turn 150 Hz modulation off through the Local Display
and Keyboard or the RMM Program.
• Read the 90 Hz frequency. Tolerance ±0.05 Hz.
Repeat the test for Course Tx2.
Record the frequency readings in Table 6-13.
6.4.3 Transmitter waveforms checks.
Carry out the tests outlined in paragraphs a)...f) for Cou Tx2, CLR Tx1 and CLR Tx2.
Record the results of the outlined tests in Table 6-9.
6.4.3.1 PHASE CORR. check.
Switch on Course Tx1.
• Connect the Oscilloscope to PHASE CORR test connector on Course Tx1 Section via a 50
ohm test cable.
• Set Oscilloscope input mode to DC.
The waveform observed should take a continuous form without limiting segments or deep
notches or other discontinuities.
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