The final minutes of American Airlines flight 5342
- The American Airlines jet that crashed in DC was given a runway change minutes before the tragedy.
- Audio tapes show the military helicopter had the passenger plane "in sight" before the collision.
- The NTSB will look at pilot and air traffic control actions when investigating the crash.
In the minutes before an American Airlines flight crashed into the Potomac River in Washington, DC, on Wednesday, an air traffic controller requested a last-minute runway change.
The regional jet, operated by PSA Airlines, was descending over Virginia and headed for the north-facing "Mount Vernon Visual Runway 1" approach at Ronald Reagan Washington National Airport.
Pilots had confirmed their approach to air traffic controllers at the airport tower around 8:42 p.m.
Moments later, a controller reported high crosswinds on Runway 1 and asked the pilots to shift to the intersecting runway.
"Bluestreak 5342 Washington Tower winds are 320 at 17, gusts 25. Can you take Runway 33?" the controller said. Bluestreak is the call sign for PSA flights.
The pilots agreed, and within minutes, the plane collided with an Army Black Hawk helicopter. All 67 people on board both aircraft died.
Business Insider reviewed official briefings, flight data, and air traffic control audio recordings to piece together what happened before tragedy struck.
The plane and helicopter's final moments of flight
Ronald Reagan Washington National Airport is an extremely busy airspace, but officials said it was a largely normal night of flying. Winds were gusty — something pilots are trained for — and the skies were clear.
The American flight had been approaching from the south, following the Potomac River along a well-known path for pilots and frequent flyers of the DC area.
The narrow corridor helps separate traffic from highly secure airspace around the White House, Pentagon, and other government buildings.
Seconds before the American flight agreed to change its path, another PSA jet responded to the same request to shift to Runway 33 as "unable," meaning it was not in a position to make the adjustment.
That flight, from Montgomery, Alabama, landed on Runway 1 as planned and continued to its gate.
The PSA pilots of flight 5342 accepting the change is not unusual. Runway 33 is a shorter strip that faces Northwest and can handle a regional aircraft like the Bombardier CRJ700 the pilots were flying.
The switch-up required the plane to move from its north-facing heading toward the Potomac's east bank before swinging back over the river to land.
At approximately 8:43 p.m., flight 5342 was cleared to land.
At the same time as the crew of flight 5342 was prepping for the new runway, an Army Black Hawk helicopter was making its way south along the river's eastern shore, following a standard, published path known as "Route 4."
Several of these channels cut through the DC area, allowing military aircraft to coexist with commercial traffic in and out of airports.
At about 8:47 p.m., a controller asked the helicopter, call sign PAT25, if they had "the CRJ in sight" and to pass behind it. The CRJ refers to the regional CRJ700 aircraft operated by PSA.
The helicopter pilot confirmed that they had the "aircraft in sight" and requested "visual separation."
Just seconds later, gasps from controllers can be heard on the audio tapes. ATC began canceling flight landings and diverting planes from National.
DC fire chief John Donnelly said emergency vehicles were on the scene by 8:58 p.m. to begin rescue operations.
Human factors are just one consideration for investigators
At a briefing Thursday, officials from the National Transportation Safety Board said teams will examine human factors as they piece together a complete picture of the crash.
"They will study the crew performance and all of the actions and factors that might be involved in human error, including fatigue, medication, medical histories, training, workload, equipment design, and work environment," NTSB member Todd Inman said. They'll also be combing through the wreckage and other evidence for clues as to what went wrong.
A preliminary FAA report obtained by the New York Times and others said staffing at National's ATC tower was "not normal" at the time of the crash. The outlet reported that the controller was handling the duties of two people, including directing helicopters in the area and passenger planes landing and taking off.
Brian Alexander, a military helicopter pilot and a partner at aviation accident firm Kreindler & Kreindler, told BI that the nighttime conditions, many aircraft lights, and busy skies may have contributed to the catastrophe.
"There was another jet on final, a couple of other jets on final, and it's conceivable the helicopter pilot was watching the wrong aircraft," he said, emphasizing that was speculation at this point.
An airline pilot previously told BI that flying in and out of National was like "threading a needle" due to the highly restricted corridors and heavy traffic, including low-flying helicopters.
Sen. Tammy Duckworth, a former Black Hawk pilot, told reporters that military pilots generally wouldn't talk directly to PSA pilots on the radio, but "everyone's listening on the same frequency."
She said the PSA plane would know that the Black Hawk was in the area but would be relying on ATC as the intermediary.
"Did one of the aircraft stray away latitude, sideways in the airspace from the route that they were supposed to be on? Was the Black Hawk higher than the 200 feet?" Duckworth said. "These are all things that the accident investigators would be looking at."
The NTSB said its preliminary report is expected to be published within 30 days.