LF-ULD: Extending the Reach of Underwater Search

The LowFrequency Underwater Locator Device (LF-ULD) is a self-powered device that provides effective help in improving the search and recovery of submerged aircraft. The LF-ULD is not to be confused with the ULD, also known as the Underwater Locator Beacon (ULB) that is installed on the Cockpit Voice Recorder (CVR) as well as the Flight Data Recorder (FDR) and emits ultrasonic impulses at 37.5 kHz.

The LF-ULD will be mounted directly at the airframe's structure and supplement the existing ULDs. Once the LF-ULD emerges into the water, it is activated automatically and transmits at a frequency of 8.80 kHz. Due to its lower frequency range, the LF-ULD has a far longer detection range of at least 90 days after activation.

?Low-frequency ULDs have a very long detection range and thereby effectively help reduce the time and cost of locating the wreckage. They transmit an 8.8 kHz acoustic signal (pinger) for a minimum of 90 days and the low frequency ensures an increased detection range (four times greater) of 13-22 km (7-12 NM) over the standard ULBs as installed on the FDRs and CVRs. LF-ULD can sustain pressure up to 8700 psi. The maximal operational depth is 6,000 m (20,000 ft) and they are activated upon immersion in both salt and fresh water. The battery is a single-cell type with a six-year life.

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