In visual approach, the pilot navigates the visual observation in the air and not by radio navigation.
Chairman of the Finnish Pilot Association Security Committee Olli Jaarinen He estimates that a military helicopter in Washington’s aircraft crash had probably been given permission from the air traffic controller to avoid the upcoming airplane based on visual observation.
A helicopter and a passenger aircraft collided with Washington last night in Finnish time. The passenger aircraft fell into the Potomacjoki.
In most cases, airplanes approach the airport based on radio navigation.
– In some circumstances, it is possible to accelerate traffic so that the impending airplane performs a so -called visual approach, where orienteering is based on the pilot’s visual observation instead of radio navigation, says Jaarinen Radio Finland’s day on Wednesday.
According to Jaarinen, visual approach is a common way to operate in the United States.
A collision warning system does not work on an airplane low
The passenger plane operated by American Airlines was just landing at Ronald Reagan’s National Airport when a collision with UH -60 Black Hawk soldier took place.
Airplanes have collision warning systems, but they do not work when flying low.
“The feature is such that it no longer gives low emergency commands, because the evasive itself might be a risk,” says Jaarinen.
According to the American Airlines source, 60 passengers had reserved a place on the flight. In addition, there were four crew members on the machine. There were three people in the helicopter. At least 30 people died in Turma.
A helicopter may have lost an airplane light sea
At the time of the accident, Washington was dark. Jaarinen considers it possible that the city lights have been able to hinder the visibility of the helicopter crew.
– Something of the helicopter crew has certainly seen when they so communicate to the air traffic control, but have they watched the right machine or lost the airplane lights among the city lights.
Jaarinen also wonders that it may have been difficult to perceive the movement of the airplane from a helicopter.
– In a way, the lights of the collision target remain in place directly in front of the beak, so it may be difficult to detect them from the city light sea. However, this is probably a rich series of unfortunate coincidences.