One thing which will be changed is the 30-day battery life of the ULBs:
The U.S. Federal Aviation Administration has ordered that all underwater locator beacons manufactured from March 2015 have the ability to transmit for 90 days. By 2020, all 30-day beacons must be replaced, the U.S. regulator said in an e-mail.
“What drove that requirement was Air France 447,” Patel said. While surface debris was found within days of the accident, locating the wreckage required robot submarines and months of searching because the black-box pingers had long since gone dead.
“Malaysia Air 370 makes the second compelling case in recent memory that these 30-day batteries should have been replaced years ago and should be replaced in a more expedited basis,” said former NTSB official Goelz, who is now a senior vice president at Washington-based lobbying and consulting firm O’Neill & Associates.
Beacons Tripling Battery Life Too Late for Plane Search - Bloomberg