National Transportation Safety Board chair Jennifer Homendy will tell a U.S. Senate subcommittee that an increase in near miss aviation incidents is a "clear warning sign that the U.S. Aviation system is sharply strained."

Homendy, who will testify at a Senate Commerce aviation subcommittee hearing along side the Federal Aviation Administration and aviation unions, will tell senators the aviation system has a lack of redundancy around technology to prevent runway incursions and wrong surface landings. "We cannot ignore or avoid the warning signs of strain from all these recent events," Homendy will say.

"We cannot wait until a fatal accident forces action. We must act before there is a tragedy."

(Reporting by David Shepardson, Editing by Franklin Paul)