©1999 Navia Aviation AS 21833-3.4 Periodic maintenance CAT I and II
OPERATING MANUALNORMARC 7013
INSTRUMENT LANDING SYSTEM
6-11
Make an alarm by removing the NF cable to the Cabinet. After the specified delay, the trans-
mitter shall change to Tx2, then after the same time lapse Tx2 shall shut down.
Record in Table 6-16 line a) the measured delay time from cable removal until the standby
transmitter has switched off.
6.4.7 20 seconds inhibit
After shutdown check that an immediate attempted restart of a transmitter is inhibited at least
20 seconds from the time the standby Tx is shut off.
Record in Table 6-16 line b) the measured time lapse from the standby transmitter has
switched off until the main transmitter is again radiating to the antenna.
6.4.8 Battery maintenance
Check with digital voltmeter that the voltage across the battery terminals is between 27.0 V
and 27.8 V. Record in Table 6-17 line a) the measured voltage.
Switch off the mains 220 V. After approximately 10 minutes battery operation with transmitter
to air check that the voltage across the battery terminals is not less than 23 V. Record in Table
6-17 line b) the voltage.
Switch back to mains 220 V. After 24 hours check that the battery terminal voltage is again
back between 27.0 to 27.8 V. Record in Table 6-17 line c) the voltage. The 27 V can be moni-
tored from the RMM facility.
6.4.9 Final check LLZ
Check that all electrical contacts and connectors are not loose.
Carry out a visual check outside and inside of the equipment.
Check that all switches and keys are in NORMAL position.
Check that the System lamp status is NORMAL after the switches AUTO/MANUAL and
REMOTE ON/OFF are in AUTO and ON respectively.
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