<p>The deadline is Dec. 1, 2015 for manufacturers to comply with Technical Standard Order C-121B, which mandates discontinuing production of acoustic, self-powered underwater locator devices (ULDs) with 30-day batteries installed, and instead producing ULDs with batteries meeting a minimum performance standard of 90 days. The TSO also requires operators flying aircraft with 30-day ULD batteries installed to upgrade to the higher standard as those batteries expire, or are no longer serviceable. December 1 is a nine-month extension from the original deadline.</p>


Mandatory Upgrade to 90-day Underwater Locator Devices

2024 Corporate Aviation Leadership Summit

Mandatory Upgrade to 90-day Underwater Locator Devices

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