User's Manual
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
TCAS 3000 Traffic Alert and Collision Avoidance System
34−43−23
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Page 6−24
15 Dec 2005
NOTE: The procedures that follow are recommended for intermittent antenna system
failures or if the continuity tests have not identified a failed component in the
antenna system or if the flight crew detects an unacceptable visual discrepancy
between an intruder aircraft and its displayed location.
(8) If the displayed location of an intruder aircraft is believed to be in error, appropriate
ramp test equipment can be used to simulate intruder aircraft to check the suspected
discrepancy while on the ground.
(9) Remove the suspected TCAS directional antenna and terminate the antenna side of
the cable with a 50 ohm termination (Omni−Spectra Part Number 3102−6100−00 or
equivalent TNC jack with VSWR ≤1.15 : 1).
(10) Perform a thorough inspection for moisture or contamination of all coax cable
assemblies.
(11) Remove the TCAS LRU and do a VSWR check on the coax cable from the TCAS
computer tray side. Use approved VSWR test equipment and operating procedures.
The measured VSWR should be less than 2.0 : 1.
(12) If the VSWR test fails, isolate failed antenna coax section. Remove/repair
appropriate cable and/or connector.
(13) If VSWR test complies, return the directional antenna to the manufacturer for further
testing. Install a new directional antenna in accordance with Aircraft Maintenance
Manual procedures.