WASHINGTON (7News) — The National Transportation Safety Board (NTSB) will begin three days of hearings on Wednesday to investigate the deadly midair collision over Washington, D.C., that killed 67 people earlier this year.

The crash happened Jan. 29 when an Army Black Hawk helicopter and an American Eagle passenger plane collided over the Potomac River near Reagan National Airport.

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On Wednesday, the NTSB will examine whether a malfunctioning altimeter on the Black Hawk may have caused the helicopter to fly higher than expected.

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Officials said the hearings will also focus on the actions of the Army, the Federal Aviation Administration, and air traffic controllers.

The NTSB is seeking to better understand how the crash happened and what can be done to prevent future tragedies.

This comes a day after U.S. Sen. Ted Cruz introduced legislation that would require all aircraft to use updated ADS-B technology to improve in-flight safety and communication. Aircraft using ADSB technology broadcast their position, velocity, and other information to other aircraft and air traffic control, and they can also see the positions of other aircraft using the technology.

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Cruz has previously said the Army Black Hawk helicopter involved in the January 29 collision had ADSB, but it was turned off.

The hearings are scheduled for:

• Wednesday, July 30 and Thursday, July 31: 9 a.m. to 7 p.m.
• Friday, Aug. 1: 9 a.m. to 2 p.m.