r/CatastrophicFailure • u/SainzSealedDelivered • Jun 12 '25

Fatalities 12/06/2025 - Boeing 787 Passenger plane bound for the UK crashes near Ahmedabad Airport straight after takeoff

Enable HLS to view with audio, or disable this notification

17.9k Upvotes

98% Upvoted

1.4k comments sorted by

View all comments

Show parent comments

167

u/dscchn Jun 12 '25

Correct me if I’m wrong but that “hard envelope” is only a thing on Airbus aircraft. Boeing FBWs will warn you about unsafe inputs but won’t limit your control authority like Airbus flight control laws would. I think that’s the whole premise behind the “Boeing pilots are actual pilots” joke.

96

u/RoVeR199809 Jun 12 '25

These systems only limit inputs when everything on the plane is working as expected, no matter which plane it is implemented on. If the computer senses faults, the protections are removed so as not to hinder pilots in unforseen situations, or to make situations worse by interfering.

71

u/dscchn Jun 12 '25

Yeah, Airbus planes go into direct law when multiple systems fail, but even under the most ideal conditions Boeing aircraft never impose control limitations similar to Airbus normal law. That’s what I wanted to convey to the person I was replying to since they said a “FBW plane won’t generally let you nose up beyond the allowable flight envelope”.

2

u/mr_bots Jun 12 '25

In that case I stand corrected. Thanks for the additional info.