sexta-feira, 26 de abril de 2013

(English text) PETERKA: Flight 1907: basic mistakes by the north-american pilots who killed 154 people

Introduction from ATC BRASIL:

We were asked to publish the English text as well on this Blog (the Portuguese version was published before)
Here is the English version/translation made either by the author and/or by somebody mandated by him.

This is the opinion of Expert PETERKA and does not reflect the opinion and the views of this Blog.
But it's for sure a source of reflection and discussion, despite the fact that it contains some basic errors or facts.
For instance it's not disputed that the Transponder and TCAS of N600XL were on and fully operational until passing Brasilia/BRS.
This is an undisputed fact.

We wish good reading!
ATC BRASIL



Flight 1907: basic mistakes by the north-american pilots who killed 154 people

By Roberto Peterka, technical assistant of MPF in the criminal charges of Flight 1907.

In that afternoon of the beginning of spring, the aircraft that would transport 154 people taking off in Manaus, would take all these people to their last action of their lives. The pilot had solicited and was answered by Air Traffic Control to take off in a lower altitude than the one stipulated by the repetitive flight plan of the company.

They were also unaware that another aircraft, of smaller size, with north-American documents, was flying in an irregular fashion opposite to the Brazilian aircraft in the same airspace, and that this would cause a crash, making this the biggest “in-air-collision” in Brazilian air space, where all the occupants of flight 1907 died.

But why this accident happened? Why the American pilots disregard many legal and safety procedures to make their flight happen? Everyone knows, since their first steps in aviation, that a flight cannot iniate without having a few elementary norms fulfilled, starting with training of the kind of aircraft Will be piloted. These two American pilots were unfit in training to pilot this aircraft.

Another important point is to check the aircraft’s documentation. If it is ready to fly; what kind of flight it can perform and if its crew comply with the legal requisites to fly under certain special circumstances of air space.

This flight should not have been made in the manner it was flown. This American aircraft could not have flown under the conditions of minimal vertical separation, due to the fact that it did not have authorization to do so. Therefore, the aircraft should not be in that place when it crashed with flight 1907. This condition of not being authorized should have been informed to Air Traffic Control, but it was not. If this situation would have been informed, flight 1907 would not have been authorized to fly in the altitude that it had solicited!

Before taking off, the pilot must make a meticulous plan of what the pilot will execute. This plan includes: analyzing all the geographical points in which it will pass [horizontal navigation], the meteorological conditions of the route, in its destiny, and an alternative airport, in case its destiny do not allow landing.

Today, technology allows this kind of planning to be made by computers however, it demands that the pilot examines it to approve, or disapprove of it. This plan made by a computer, served as base to a presentation of the flight plan had two level alterations. One in Brasilia, and another one in a virtual point called aeronautical fixed point. We can simplify these steps in just one thought: “The flight that you will do, you have done it. All you have to do now is to execute what you have planned”. This plan was also considered inefficient.

Right after they turned on the engines and were getting ready to takeoff, the American pilots did not fulfill other safety and legal procedures as well.

They did not turn on the anti-collision device [TCAS]. This equipment serves as warning sign of proximity of another aircraft with a potential of collision. The velocities these modern aircrafts take these days make it impossible for a person to visualize one aircraft approaching. This technology could be considered the electronic eye of the pilots.

This equipment was turned on only after the crash, when the pilots talked among themselves, as it was registered on the dialog Box [Black Box] that this equipment [TCAS] was turned off.

Another equipment turned off after crossing Brasilia was the transponder that sends signals to Air Traffic Control and for anti-collision devices of other aircrafts, transmitting geographical location, flight altitude, the direction, and the speed of the airplane sending this information.

This important safety device was only turned on again after the conversation between the pilots about the TCAS being turned off. Coincidently, less than a minute after this conversation, information sent by the American airplane began to appear in all radars, and the black box began operate. Before the collision and even with all the equipments turned on by the crew of flight 1907, confirmed by the black box, the airplane could not identify another aircraft in a collision course, due to the fact that the other airplane had all the paramount equipments to do so turned off!

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