More MH370 stuff

It is technically possible to hijack a plane from the av bay and fly it (via autopilot) from there. I'd guess though that once the crew started pulling CBs you'd lose your ability to control the AP, but possibly (in the case of a FBW plane) not the ability to directly tap in to the FCCs.

Does @milesobrien still post here? Be great to have him in the conversation since it's his video.
 
BobDDuck said:
It is technically possible to hijack a plane from the av bay and fly it (via autopilot) from there. I'd guess though that once the crew started pulling CBs you'd lose your ability to control the AP, but possibly (in the case of a FBW plane) not the ability to directly tap in to the FCCs.

Does @milesobrien still post here? Be great to have him in the conversation since it's his video.
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That's what I thought, so I went down the rabbit hole after reading this...and I found this:

http://en.wikipedia.org/wiki/Boeing_Uninterruptible_Autopilot
http://en.wikipedia.org/wiki/Boeing_Honeywell_Uninterruptible_Autopilot

I'm not one to typically think about this sort of stuff, but if this isn't BS (and can one of the Boeing Guys let me know if it is?) then hijacking starts to sound plausible again...
 
With a FBW control system EVERYTHING goes through the flight control computers. In theory if somebody was to be accessing them directly, what you did on the yoke up front wouldn't really matter. I suppose you could pull breakers for the FCCs, but I don't know the system architecture well enough to know what happens with an FBW system when you take out the computers doing the flying.
 
BobDDuck said:
With a FBW control system EVERYTHING goes through the flight control computers. In theory if somebody was to be accessing them directly, what you did on the yoke up front wouldn't really matter. I suppose you could pull breakers for the FCCs, but I don't know the system architecture well enough to know what happens with an FBW system when you take out the computers doing the flying.
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That's pretty spooky
 
RDoug said:
Another silly theory from another silly "expert" from a silly "news" channel that months ago discredited anything they have to say on the subject.

I'll wait until they find the wreckage and recover the DFDR and CVR.
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Miles has a long history of actually doing his homework. While I agree the piece is nothing more than speculation and an attempt to get eyeballs on the screen, he's one of the good guys.
 
Dugie8 said:
An elite terrorist group got into the avionics bay and took over the aircraft, intentionally avoided radar coverage areas and crashed the airplane in the Southern Hemisphere to appease C'thul.

All hail C'thul
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ll50492d58.png
 
BobDDuck said:
With a FBW control system EVERYTHING goes through the flight control computers. In theory if somebody was to be accessing them directly, what you did on the yoke up front wouldn't really matter. I suppose you could pull breakers for the FCCs, but I don't know the system architecture well enough to know what happens with an FBW system when you take out the computers doing the flying.
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You'd need a 25 pin jack on some of them, and I think the 777 has a USB but I don't think there's one in the AV compartment. Once you get in you can't edit flight parameters. I'm going off memory here and that wasn't really my focus but it was something we had to deal with testing boxes that needed to monitor inputs/outputs of the boxes. Normally it involved a lot of transformer and MOV isolation so we didn't fry the laptop AND the box.
ppragman said:
That's pretty spooky
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So the next thing you'll need a hacker who is familiar with proprietary software, and (essentially) driver code. Using his stolen password of "Jeff" (The writer of the program's name is Jeff Jeff'ty Jeff born in Jeff, Jeff in nineteen-Jeff'ty Jeff), he hacks in and changes all the parameters of the flight control computer and lowers the G/S to 2.00. The entire plan goes to crap because he just figured out he needs to get all three independent computers to show the same thing at the same time and he only brought one laptop. The system is just doing too good a job ignoring the new crap info (from the hacker's laptop) that doesn't gel with the other ADC's. So he takes his penknife he snuck aboard and snips the blue wires on the other two ADC's which feed information into the central unit (whatever it's called on this airplane) which integrates all the information from all the systems. Plot twist: he's been color blind since birth and never knew it so, the wires were actually the dreaded red wires.
Murdoughnut said:
Can you control pressurization from the avionics bay?
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Finally, after snipping the dreaded red wires on the ADC the computer naturally reverts to a system bias test which drops innane trivia into the FMC's up top in the cockpit. The Captain and FO's weren't trained under the dumbest eff's in the planet at Pinnacle Airlines, so when the question came up "How many fuse plugs are on each tire?" and he answer 4 the plane blew up.

I'm going to hell.
Boris.gif
 
BobDDuck said:
While I agree the piece is nothing more than speculation and an attempt to get eyeballs on the screen, he's one of the good guys.
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You do realize, I hope, that is a mutually exclusive statement. He can't be "one of the good guys" if he's advancing wild, silly speculation for the sole purpose of garnering ratings rather than actually shedding light on an otherwise "hard news" story. There are already plenty of silly conspiracy and other theories out there without a "good guy" looking to spread more of the same.
 
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