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сигнал об отказе stresses
automat.	fault alert (напр. датчика, узла или детали)
avia.	failure warning
IT	fault sign
Makarov.	failure alarm
oil	failure signal
tech.	malfunction alarm; failure alarm
telecom.	fault alarm (oleg.vigodsky)
transp.	fault alert
сигналы об отказах
telecom.	fault alarm (oleg.vigodsky)

сигнал об отказе: 4 phrases in 3 subjects

General	1
Quality control and standards	2
Telecommunications	1