WASHINGTON, July 22 (Reuters) - The National

Transportation Safety Board will hold a three-day investigative

hearing starting July 30 over the fatal collision in January

between a U.S. Army helicopter and an American Airlines ( AAL )

regional jet that killed 67 near Reagan Washington National

Airport.

The board will also release thousands of pages of records

from its investigation. The NTSB will review the Army Black Hawk

helicopter air data systems and altimeters as well as the

Federal Aviation Administration's oversight of Washington

airspace and air traffic, according to the agenda of the hearing

released Tuesday.

The hearing is currently scheduled to run over 25 hours

during three days. It will include officials from the FAA, Army,

airline and others who are expected to release significant new

details of the deadliest U.S. aviation crash in more than two

decades.

Senators and regulators have raised alarm at close calls

involving Army helicopters.

The NTSB said in March that since 2021, there were

15,200 incidents near Reagan between commercial airplanes and

helicopters with lateral separation distance of less than one

nautical mile and vertical separation of less than 400 feet, and

85 close-call incidents during that period.

"Clearly something was missed," Deputy FAA Administrator

Chris Rocheleau told Congress

.

Last month, the FAA shrank the area where helicopters

are allowed to operate. In March, the FAA imposed permanent

restrictions on non-essential helicopter operations to eliminate

the chance of collisions, including permanently closing one key

route.

U.S. Army Brigadier General Matthew Braman, who was

director of Army Aviation at the time of the crash and testified

before Congress, is now in a new role at the Army, officials

said.

In the aftermath of a May 1 incident in which two

passenger airline flights were

forced to abort landings

at Reagan because of a nearby Army helicopter, the FAA

barred the Army from conducting helicopter flights around the

Pentagon. The FAA said last month

it has been negotiating a memorandum of understanding

with the Army to resume flights but it has not been

finalized.