WASHINGTON, March 31 (Reuters) -

The U.S. Army refused to turn over a 2024 report detailing

why it has routinely failed to use a safety system known as

ADS-B on helicopter flights around the Washington airport,

senators said on Monday.

An Army Black Hawk helicopter did not have ADS-B operating

during a routine training mission when it collided with an

American Airlines ( AAL ) regional jet on January 29 killing 67

people.

Senate Commerce Committee chair Ted Cruz, a Republican, and

Senator Maria Cantwell, the top Democrat on the panel, last week

demanded the Army turn over the report by Friday.