China and Australia have detected three pulse signals in three days. Is this the prelude to the black box's search? The search for the black box plays an important role in understanding the truth of the Malaysia Airlines incident. The pulse signal was found on the 5th of the 1st round of the maritime patrol, which is an important and exciting clue. However, whether it is a black box remains to be further investigated. Moreover, the place where Australia and China found the pulse signal is not in the same place.
Is the frequency of 37.5 Hz necessarily a black box? In terms of frequency, it is not only the black box that sends out 37.5 kHz, but other machinery and equipment or aircraft may also send out such frequency. However, if the continuous signal of 200 times per second is detected, it is more likely to confirm that it is a black box, because the signal sent by the black box is continuous.
How to find a black box underwater? What is the color of the black box?
Underwater positioning beacons: in addition, both black boxes are equipped with underwater positioning beacons (ulbs), which are triggered by water immersion beacons; most of them emit ultrasonic pulses of 37.5 kHz per second. Through the ultrasonic underwater positioning beacon, it can automatically send out ultrasonic signal for 30 days after the black box falls into the water. Even under water, the sound is clearly discernible 8 kilometers away. Finding the black box can reveal the mystery of Malaysia Airlines' disappearance. Maybe in the next few days, we can know what happened to Malaysia Airlines through the black box. But the power of Malaysia Airlines is very weak so far. Maybe after a month, the signal of Malaysia Airlines' black box will be weakened. Therefore, the search work must be carried out as soon as possible to give comfort to the people all over the world!