[testemailfordg2]

Three things:- 1) Pilot clearly said I didn't do it. 2) Report talks about the second switch being turned off in a second. 3) Known advisory on switches getting flipped.

If you see these three together, it becomes easy to deduce that based on point 2, switch was not human induced as the actions required take more than a second. Next the third point, advisory was for this exact scenario which played out, though rare but still it shouldn't have been just an advisory, but more than that.

[hwillis]

The switches are right next to each other and have a very short throw[1]- it would definitely be possible to do them in under a second and it looks possible to throw them together.

IMO that looks like a spot that would be pretty difficult to hit accidentally even if the ward failed. You'd have to push them down and the throttles are in the way.

Doesn't mean the switch couldn't have failed in some other way- eg the switch got stuck on the ward but was still able to activate with a half-throw, and spring pressure pushed it back into off during a bump. But switches generally only activate when fully thrown, and failing suddenly at the exact same time is not really what you would expect.

[1]: https://www.reddit.com/r/indianaviation/comments/1lxra3g/b78...

[CPLX]

> it becomes easy to deduce that based on point 2, switch was not human induced

This just isn’t correct at all. The evidence isn’t conclusive but if a human operated switch was flipped, and one of the humans present says to the other one hey why did you do that, then Ockham’s razor points to a human flipping the switch.

It’s not the only option, but it’s certainly the most likely.

[bonoboTP]

> as the actions required take more than a second

Where do you get this from? You have to pull up the switch with two fingers and move it to the other position and put it back in. This doesn't seem to take more than a second if deliberate.

To me, it points to a Germanwings-style sabotage. And the "I didn't do it" seems to be a lie. Not very confident in it, just the likeliest to me. Though one can ask why not just push the nose down instead. Maybe he thought that's too easy for the other pilot to counteract. The fuel switches are more out-of-mind and more startling to change.

[rainsford]

> And the "I didn't do it" seems to be a lie.

As has been pointed out elsewhere, even if one of the pilots did deliberately move the switches, it's not clear from the reporting so far if that's the same pilot who responded to the question. In other words, it's possible one pilot flipped the switches and then asked the other pilot why he cut off the fuel to misdirect and create more confusion.

Edit: Of course this is all speculation, we don't know if the switches were moved deliberately and if so which pilot did so and which pilot was which in the exchange. More investigation is clearly needed.

[venusenvy47]

If there was any worry that 787 switch lockouts are not working properly, wouldn't they release an immediate bulletin for inspections on all aircraft? It seems like the lack of any bulletins implies the lack of any suspicion on hardware problems.

[AnonMO]

The advisory was for the lock being disengaged meaning you would still need to manually move it. it wasn't for being moved by factors such as vibrations also If it was from vibration how would a crash impact not move them back to cut off?

[18172828286177]

In this phase of flight the pilot’s hands should be nowhere near the thrust levers let alone the fuel cutoff switches. There is no way they could accidentally knock them with their hands.

[aaronmdjones]

On the contrary, it's quite normal that the PF's hands are on the throttle levers throughout the climb (until the switch to automation), which are directly in front of the cutoff switches.

[cjrp]

They could be close for retracting the flaps. Completely different control though.

[ajross]

> the actions required take more than a second

Not sure where this is asserted? These aren't complicated mechanisms, it's just a pull lock, right? Pilots flip the switches twice on every flight at startup/shutdown, it's a routine action.

[dr_]

1) but what else would they say if they did do it?