The National Transportation Safety Board has the cockpit voice recorder from Southwest Airlines Flight 345 in its lab in Washington, DC, and is investigating why the Boeing 737-700’s nose gear collapsed upon landing at New York LaGuardia on July 23.

The aircraft, coming in from Nashville at 5:40 pm, slid on its nose for 2,175 feet at before stopping on the right side of Runway 4.

The 737’s nose wheel collapsed and pushed into the lower fuselage, which damaged the electronics bay that houses avionics. The NTSB said via Twitter that only the right axle remained attached after the plane skidded down the runway.

Southwest said that the aircraft was last inspected on July 18 and it entered service in October 1999.

Dennis Jones is NTSB’s lead investigator for this incident.

Of the 150 people onboard the flight, three customers and five crew members were treated and released at local hospitals, according to a Southwest statement.