190-01279-01
GTS 8XX Part 23 AML STC Maintenance Manual
Rev. 2
Page 7-8
7.4 System Checkout
This section details aspects of the GTS 8XX system checkout. It includes traffic audio and system interface
checks, plus detailed procedures for conducting Ramp and Return to Service Test procedures. An alternate
flight check procedure is also provided.
7.4.1 System Test and Audio Check
Verify that the GTS 8XX system produces aural alerts.
1. While on the ground, turn on the GTS 8XX system and audio panel following normal power-up
procedures.
2. Connect a headset to the audio panel and set the volume to a typical in-flight volume level.
3. Command the GTS 8XX system into Self-test mode. If switches are used to control the mode of
the GTS 8XX system, this is done by activating the Traffic Test switch.
4. When the self-test is completed, the aural announcement “TAS SYSTEM TEST PASSED” or
“TCAS ONE SYSTEM TEST PASSED” should be heard. Evaluate the audio for acceptable
volume and intelligibility.
NOTE
The traffic system audio volume can be adjusted, if necessary. Use the following flight
check to ensure the audio volume configuration is acceptable after adjustments.
7.4.1.1 Traffic Audio Flight Check
NOTE
The traffic audio volume should be loud enough to ensure aural alerts are audible under
all anticipated noise environmental conditions. This check verifies traffic audio can be
heard during flight.
1. Perform the traffic flight evaluation for the following scenarios:
◦
Not wearing a headset during a normal climb with maximum power
◦
Wearing a noise-attenuating headset during cruise flight
◦
Not wearing a headset during cruise flight
◦
Not wearing a headset during a normal descent at high airspeed
2. When the aircraft is in the necessary flight configuration, place the GTS 8XX system in Standby
mode, then initiate a GTS 8XX system self-test.
3. Evaluate the volume of the audio message. Ensure the GTX 8XX traffic system audio can be heard
clearly and intelligibly. If the volume is too high or low, adjust to an acceptable level.
