The Low-Frequency Underwater Locator Device (P/N 21435-00) is a battery-powered acoustic beacon that emits an 8.8 kHz pulse for a minimum of 90 days after water immersion to aid recovery of submerged flight recorders.
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Overview
Low-Frequency Underwater Locator Device is a self-contained acoustic locator supplied as part number 21435-00. The device houses a lithium battery and an automatic water-activated switch in a watertight aluminum case and emits a low-frequency ultrasonic pulse (8.8 kHz) for a minimum of 90 days to assist search and recovery teams in locating submerged aircraft wreckage and flight recorders. The unit is engineered to withstand high-impact shocks and operate at extreme depths.
Features & Benefits
Extended detection range: Low-frequency (8.8 kHz) signal provides greater detection range than standard 37.5 kHz ULBs
Long operational life: Integrated lithium battery provides a minimum of 90 days of continuous operation after activation
Durable construction: Watertight aluminum case designed to withstand deep-sea pressures and high-G impacts
Automatic activation: Water-sensitive switch ensures automatic activation upon immersion in fresh or salt water
Self-contained: No interface with aircraft systems required for activation
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