AS 680/682
Maintenance and Repair Description, Operation and Maintenance
ADS−B
7−8 Ed. 10.07
7.2.3.1 Tests if BITE Failure (red)
7.2.3.1.1 GPS Fault
− If on site: Does the GPS module show a fault (red LED on front panel)?
− If on site: Is the GPS antenna connected?
− If on site: Is a GPS module present at all (GTS, upper left slot)?
− On the TSC ’Groundstation’ page, is ’GPS’ enabled? Is ’Time Synchronisation’ set to ’gps’?
− If on site: Does the GPS module front panel LED show a 1 PPS flash once per second?
− If on site: Does the GPS module front panel LED indicate satellites being tracked (number of green
flashes indicates number of satellites in view). At least 5 satellites are required.
− On the TSC ’GPS’ page, is a ’Type’ and (Software) ’Version’ indicated?
− Does it announce ’GPS Data’ available?
− Is there a ’HPL’ value and the ’No. of Satellites (HPL)’ different to 0?
− Is the current position deviation between declared Ground Station position and measured GPS
position lower than the configured threshold?
− Is the actual time deviation between GPS and system clock lower than the configured threshold?
7.2.3.1.2 Fault in Site Monitor Telegram (own), Site Monitor Bite (own)
− If on site: Is Site Monitor properly connected and active? Site Monitor TX LED flashes at configured
rate.
− If on site: Does the Site Monitor show a fault (red LED on front panel)?
− If on site: Verify Site Monitor Configuration:
Downlink Format DF−18, Unique Mode S Address, Jitter enabled, Repetition interval.
− On the TSC ’Site Monitor’ page, Is the correct ’Telegram Downlink Format’ and the Mode S ’Ad-
dress’ configured for the own Site Monitor?
− Is the ’Expected Repetition Interval’ of the own Site Monitor telegram at least twice as large as the
configured repetition interval of the Site Monitor?
− Is the received signal strength higher than the configured minimum threshold for the own Site Mon-
itor (look at raw data)?
7.2.3.1.3 Fault in the RF Path
− If the own Site Monitor is not received and the own Site Monitor BITE is not ok then the Site Monitor
is faulty.
− If the own Site Monitor is not received, and the own Site Monitor bite is ok and the other Site Monitor
is received, then the cable between own Site Monitor and antenna is broken.
− If the own Site Monitor is not received, and if the own Site Monitor bite is ok and if the other Site
Monitor is not received, then further test is needed:
a) Check if any target is received on the SPB RXDL LED (if on site) or using raw data recording.
b) On the TSC BITE page, verify that the SBC software is correctly running, i.e. all threads are green
(e.g. main thread, base thread, etc.).
c) Activate the loopback telegram test to verify the SPB is working.
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