Instrumentationhard#471
The underwater locator beacon (ULB) on an FDR/CVR transmits on:
A
121.5 MHz
B
243 MHz
C
37.5 kHz (ultrasonic)
CorrectD
406 MHz
Explanation
The ULB transmits ultrasonic pulses at 37.5 kHz, detectable by sonar equipment, activated on water immersion for at least 30 days.
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