La caja negra del Boeing 737 MAX de Ethiopian Airlines siniestrado el pasado 10 de marzo sugiere que falló un sensor que activó un sistema que ocasionó el accidente, según informó este viernes The New York Times.
|
etiquetas: caja negra , avión , ethiopian airlines , sensores 
en.wikipedia.org/wiki/Boeing_737_MAX#Maneuvering_Characteristics_Augme
Maneuvering Characteristics Augmentation System (MCAS)
The Maneuvering Characteristics Augmentation System (MCAS) was developed for the 737 MAX to prevent stalls in flaps-retracted, low-speed, nose-up flight.[95] The MCAS uses airspeed, altitude and angle of attack (AOA) sensor data to make an attempt at computing when a dangerous condition has developed and then trims the aircraft nose down.[96]
Boeing 737 MAX aircraft have engines mounted higher and further forward than previous 737 models. This engine relocation and the new nacelle shape cause an upward pitching moment. In order to pass Part 25 certification requirements, Boeing employed the MCAS to automatically apply nose-down trim when the aircraft is in steep turns or in low-speed, flaps-retracted flight. When the angle of attack (AOA) exceeds a limit that depends on airspeed and altitude, the system activates without notice to the pilot. The system is temporarily deactivated when a pilot trims the aircraft using a switch on the yoke.[96]
The system receives input from only one of the two AOA sensors mounted on the aircraft's exterior.[96] Boeing and the FAA decided the AOA reading and AOA-disagree alert features were not critical for safe operation and could be considered optional;[97] Boeing charged extra for these alerts.[98][99] Following the crashes of Lion Air Flight 610 and Ethiopian Airlines Flight 302 soon after takeoff, for which several technical experts implicated the MCAS,[46] Boeing announced a planned software upgrade that notifies pilots of a sensor failure.[100][101] It will be deployed to aircraft operators "in the coming weeks", the company said on March 11, 2019.[100] As neither crashed plane had the optional AOA features, Boeing will make the AOA-disagree alert, but not the angle of attack indicator, a required feature for all future 737 MAX planes.[102]
On March 28, Boeing announced that it had completed software modifications to the MCAS system, and revised pilot certification requirements pertaining to the 737 MAX aircraft. This is subject to approval by the FAA and regulators in other countries.[103] Canada and the European Union have stated that they will conduct their own evaluations,[104][105] while the Civil Aviation Administration of China has stated that it would independently review software updates.[106] A critic[a] suggested that software changes may not be enough to counter the 737 MAX's engine placement.[107] Questions remain as to why the angle of attack (AOA) sensor sent bad data that triggered the MCAS system to trim a nose down condition. Possible design or maintenance issues with the AOA sensors may have to be investigated.[108]
El problema real es que la gente que no sabe de qué narices habla piense que los ordenadores son cajas mágicas con superpoderes, o que la capacidad de cálculo los hace infalibles. Hay muchos más factores que limitan la utilidad de los sistemas "inteligentes".
Hollywood ha hecho mucho daño.
- Solo usa datos de un sensor (y eso que tiene dos)
- No se puede desconectar (o no se desconecta solo si ve cosas raras, como por ejemplo, que los datos los dos sensores de angulo de ataque indican datos contradisctorios)
Aquí lo cuentan bastante bien:
www.meneame.net/c/26703410
www.meneame.net/c/26703391
Si todo esto se confirma es una cagada muy grande de Boeing.
Possible design or maintenance issues with the AOA sensors may have to be investigated.[
Por lo que tengo entendido los aviones son muy nuevos, no sé si da tiempo a tener problemas de manteinimiento.
Estoy de acuerdo en que es una gran cagada de Boeing y también de la FAA.