GE ADTS 542 Instruction Manual page 26

4d Aircraft status:
• When the ADTS is controlling the aircraft and it is "off ground" or after power on
self test the LED will be Yellow
• When the ADTS is controlling the aircraft to "going to ground", the LED will flash
yellow
• When the ADTS has made the aircraft "safe at ground", the LED is green. In
standby-mode, this LED will be off.
Test set status indications:
ADTS542F
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