AS6254 Minimum Performance Standard for Low Frequency Underwater Locating Devices (Acoustic) (Self-Powered)

While Underwater Locating Devices (ULD) have been used for many years to indicate underwater location for aircraft crash survivable flight recorders, the detection range has been limited due to the defined performance characteristics, in particular with regard to the frequency of the transmitted pulse. A ULD operating at a lower frequency provides for an extended detection range which facilitates general position identification of a submerged aircraft. The low frequency ULD is intended to be mounted directly to the aircraft as a supplement to the existing ULDs which are attached directly to the crash protected recorders.