Huerta also explained why the FAA allowed the aircraft to fly on January 11 after a battery caught fire on a plane in Boston -- but grounded it following a 787 emergency landing in Japan four days later prompted by a battery alarm and a report of a burning smell.
One plane had a cracked cockpit window, another had a fuel leak and a third plane made an emergency landing after a smoke alert went off.
Last month, safety regulators grounded the entire fleet of Boeing 787 Dreamliners after a battery on a plane operated by Japan Airlines caught fire, while a battery malfunction forced an emergency landing of a flight operated by All Nippon Airways.
One hundred and fifty orphans and 28 adults died when a US air force transport plane made an emergency landing after a door blew out.
Earlier this month, a battery in a JAL 787 plane caught fire, while an All Nippon Airways flight was forced to make an emergency landing because of a battery malfunction.
BBC: Dreamliner: Japan's airlines say they changed batteries
The A350 is intended as a rival to the Dreamliner, which was grounded last month after a lithium-ion battery on a Japan Airlines plane caught fire, while an All Nippon Airways flight was forced to make an emergency landing because of a battery malfunction.
Japanese officials said flight data from a Boeing 787 jet that made an emergency landing has shown no evidence that its battery was overcharged, a finding that dovetails with a U.S. probe.
The Dreamliners were grounded after a battery in a Japan Airlines 787 plane caught fire in Boston, while an All Nippon Airways flight was forced to make an emergency landing because of a battery malfunction earlier this month.
The 50 Dreamliners in service have been grounded since 16 January, after a battery in a Japan Airlines 787 plane caught fire in Boston, and an All Nippon Airways flight was forced to make an emergency landing because of a battery malfunction.
It had been attempting to make an emergency landing at a military air base near the airport.
None of the 81 passengers and crew was injured in the emergency landing on a disused military airstrip on Tuesday, Russian officials said.
Novel features included a composite fiberglass airframe, a glass-panel cockpit and a parachute designed to float the airplane to a safe landing in an emergency.
In the most serious incident so far, an All Nippon Airlines (ANA) 787 with 129 people aboard made an emergency landing after a battery alarm Wednesday morning.
Five days later, following another battery mishap that led to an emergency landing of a 787 in Japan, LaHood and Huerta ordered United, the lone U.S. carrier with 787s, to ground the planes.
Fears about battery safety emerged after a lithium-ion battery in a 787 operated by All Nippon Airways overheated, forcing an emergency landing in western Japan in mid-January and a worldwide grounding of the Dreamliner fleet.
Meanwhile, an All Nippon Airways flight was forced to make an emergency landing because of a battery malfunction.
It comes after an All Nippon Airways (ANA) 787 had to make an emergency landing due to a battery malfunction.
The battery on one JAL plane caught fire, while an ANA flight had to make an emergency landing due to a battery fault.
Japanese aviation officials said data from a Boeing Dreamliner that made an emergency landing show no evidence the battery was overcharged, shedding new light on what went wrong.
Last year, an A330-303 was forced to make an emergency landing in Australia after a sudden change in altitude injured 74 passengers.
Nine days later, an All Nippon Airways 787 had to make an emergency landing in Japan after a battery started to give off smoke.
BBC: Dreamliner: Boeing 'may never find battery fault cause'
The entire fleet of 787s was grounded last month after a battery on one plane caught fire, while a malfunction forced another to make an emergency landing.
Two men were injured when a police helicopter was forced to make an emergency landing.
Last year, a United Airlines flight was forced to make an emergency landing due to an electrical problem.
Running out of fuel, in a pitch black sky, the pilot performed an emergency landing in Manchester, New Hampshire.
The FAA and other authorities grounded the entire fleet after a second incident nine days later led to an emergency landing by an All Nippon Airways 787 in Japan.
Boeing's entire fleet of Dreamliners was grounded after a battery on a Japan Airlines 787 caught fire, and a malfunction forced an ANA flight to make an emergency landing.
BBC: Dreamliner: Japan's ANA cancels more Boeing 787 flights
The Boston fire and a subsequent incident involving a battery alarm and a report of a burning smell on another 787 that made an emergency landing in Japan prompted the Federal Aviation Administration and other safety agencies globally to ground the Dreamliner last week.
CNN: Quick fix for Dreamliner looks less likely, experts say
The source of the problem that forced the Boeing 737-300 used on the Southwest Airlines flight 812 from Phoenix to Sacramento to make an emergency landing on April 1st, following a five-foot rent appearing in the upper-fuselage skin, has flummoxed engineers and safety officials alike.
Independent MLA Jim Allister wanted to know if this announcement was designed to provide a "soft landing" for what was intended to be a permanent decision to close the City accident and emergency department.
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