The American manufacturer Boeing underlined on Monday that it did not deactivate “intentionally or otherwise” the sensor fault warning system.
The American manufacturer has issued a statement on these matters after it has been known that it did not warn Southwest Airlines that the 737 MAX that the airline started operating in 2017 had a security system disabled by previous models.
According to Boeing, this system was included as a standard and independent feature in the MAX range, although it has not been considered a safety feature in aircraft and is not necessary for the safe operation of the aircraft.
Thus, the company has stressed that it did not deactivate “intentionally or otherwise” this warning system, although it has clarified that it was not available on all airplanes because this function was not activated as it should.
The deactivated system served to warn the pilots if one of the sensors was transmitting incorrect data about the nose inclination of the aircraft. However, in the 737 MAX, which had the new stabilization system MCAS – System of Increase of the Characteristics of Maneuvers -, only the previous system was included if the clients acquired an optional package of security measures.
In this same line, he clarified that this system was linked to the angle of attack indicator, an optional function in the MAX. In this sense, it has specified that, unless an airline opted for this angle of attack indicator, the alert was not operable.
Southwest, the largest customer of 737 MAX worldwide with 23 devices, says it was unaware of these changes until the Lion Air accident occurred last October, although this ignorance had not been transferred to the Federal Aviation Administration (FAA). , by its acronym in English). In fact, some government officials have indicated that the FAA inspectors responsible for controlling this airline were not aware of this change either.
In any case, the aeronautical manufacturer has defended that in all delivered aircraft, including the MAX, all flight data and information necessary to safely operate the aircraft is provided in the flight deck and on the screen of the flight platform. flight, an information “easily accessible” for pilots.
In this regard, he stressed that the main indicators of flight information in the cabin are based on “the air speed, attitude and altitude screens, together with the stick agitator” and not in this warning system or the indicator of attack angle.
Boeing has stressed that when the MAX returns to fly when the software update has the corresponding safety certification, all aircraft of this model will have this alert activated and operable and an indicator of angle of attack options.
Likewise, all clients with MAX aircrafts delivered previously will be able to activate this alert according to a service bulletin to the airlines. “We are confident that when the MAX returns to the skies, it will be one of the safest aircraft to fly,” concluded Boeing.