WASHINGTON - The US National Transportation Safety Board said on Tuesday improper maintenance was the likely cause of a Dec. 7, 2011 air tour helicopter crash near Las Vegas that killed the pilot and four passengers.
The board said its investigation of the crash of a Sundance Helicopters Eurocopter AS350 found inadequate maintenance, including degraded material, improper installation and inadequate inspections.
"This investigation is a potent reminder that what happens in the maintenance hangar is just as important for safety as what happens in the air," NTSB Chairman Deborah Hersman said in a statement.
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