MH370: Pinger Locator ready to roll

KUALA LUMPUR - The Towed Pinger Locator 25 (TPL-25), a United States Navy equipment has arrived in Perth, Australia to assist in the search for the missing Malaysia Airlines MH370.

The United States Navy's 7th Fleet in their Facebook posting said the TPL-25 system would help in locating emergency relocation "pingers" (short high-pitched signals for purposes of detection) from MH370 black box.

The new equipment enable the team to locate the flight recorder at a maximum depth of 20,000 feet.

The system consists of the tow fish, tow cable, winch, hydraulic power unit, generator, and topside control console.

The TPL-25 would be towed behind a vessel at slow speeds, generally from 1 - 5 knots depending on the depth.

Recovery of the "pingers" which usually mounted directly on commercial aircraft flight recorder was critical in the accident investigation.

Most "pingers" transmit every second at 37.5 kHz, however the TPL-25 can detect any "pinger" transmitting between 3.5 kHz and 50 kHz at any repetition rate.

The received acoustic signal of the "pinger" was transmitted up the cable and presented to either a Oscilloscope, or Signal Processing Computer.