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WASHINGTON — BlackBerry is being dropped by a U.S. government agency that cited the device’s failures. The National Transportation Safety Board, which investigates plane accidents, disclosed its plan to switch to Apple’s iPhone 5 in a document posted last week to a federal website. BlackBerrys have been “failing both at inopportune times and at an unacceptable rate,” according to the NTSB’s notice. The 400-employee agency “requires effective, reliable and stable communication capabilities to carry out its primary investigative mission and to ensure employee safety in remote locations,” it wrote. Blackberry maker Research In Motion has been hit by recent defections by U.S. agencies and is counting on a wave of service upgrades in its new BlackBerry 10 devices to shore up business among more than 1 million government customers in North America, chief executive Thorsten Heins said.