The L3Harris 90-Day ULB (part number 266E5542-00) is a durable acoustic beacon that emits an ultrasonic pulse for at least 90 days upon water immersion, aiding recovery of cockpit voice and flight data recorders after submersion.
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Overview
L3Harris 90-Day Underwater Locator Beacon (ULB), part number 266E5542-00, is a long-life, battery-operated acoustic locator designed to be attached to an aircrafts Cockpit Voice Recorder (CVR) and Flight Data Recorder (FDR). Upon immersion it activates via a water switch and emits an ultrasonic pulse for a minimum of 90 days to assist recovery teams. The unit is engineered to withstand impact, deep-sea pressure, and other severe conditions. It is powered by a lithium battery with an extended shelf life and requires maintenance and battery replacement by certified aviation technicians.
Features & Benefits
Extended operational life: Operates for a minimum of 90 days after activation, increasing recovery time for search teams
Enhanced safety: Provides critical locating data for accident investigation and recovery efforts
Robust and durable: Engineered to withstand crash impact and deep-sea pressure
OEM approved: Intended for use on L3Harris flight recorders and listed in official supply chains
Certified for aerospace use: Designed to meet requirements of aviation authorities for flight recorder locating devices
Specifications
Part Number: 266E5542-00
Operating Life: 90 days minimum after activation
Technology: Acoustic pinger (ultrasonic pulse)
Frequency: 37.5 kHz (standard ULB) or 8.8 kHz (low-frequency ULB)
Power Source: Lithium battery
Shelf Life: 84 months (7 years)
Activation: Automatic upon immersion in water (via water switch)
Technical Information
Certifications: Designed for aerospace use and meets certifications from aviation authorities such as the FAA, EASA, and CAA
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