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Is DEF the fluid used in diesel vehicles....probably for an EPA mandated reason?  If so, how would it get into Jet-A fuel (assumed fuel for that plane)?

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I don't think a 604 uses prist.

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I don't think a 604 uses prist.

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Holy shit. It flew almost right over my house shortly before it crashed. I’m shocked I haven’t heard any sirens or anything. When exactly did it crash?

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Meh, no big loss for society. Sad people lost their lives but to care based on sportsy personalities is a misplaced life.

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Is it possibly something like a transfer pump or tank switch failed and it went down because a tank went dry and they couldn't/didn't switch tanks?

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https://www.youtube.com/watch?v=zpddfgXsiNQ

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but did you die?!?!?!

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The pilot was a close friend of some close friends of ours.

Homeschool dad.

RIP.

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You know every time a little plane, not a twin jet, lands on a highway they try to land going with the flow of traffic cuz going opposite the flow of traffic you're bound to hit somebody and you might be able to find a clear space in between cars going with the traffic or at least they're doing 70 miles an hour when you land in the same direction

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DEF, as used for diesel engine exhaust after-treatment, is about 30% urea (ammonium nitrate) and 70% water. DEF in diesel or jet fuel would be disastrous! But no way would the problem have shown up that late in the flight. It would be like having water in the fuel tank of your car. And DEF is very corrosive.

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Is it possibly something like a transfer pump or tank switch failed and it went down because a tank went dry and they couldn't/didn't switch tanks?

This happened once at the Skywest on a CRJ200 which has the EXACT same pedestal as the 604.  Same type rating too I believe.  CL-65.  

In that event, the FO was flying called and called for flaps.  As the CA reached over to select the flap lever, the FO pulled the thrust to idle.  
The red switches that allow the thrust levers to continue past idle into shutoff got bumped by the CA's arm upward.  
So instead of the thrust coming to idle, they continued down through the detent into shutoff.

That crew was able to get them relit.  Fortunately they were still high enough.  Im thinking maybe this happened here.  

The CRJ200 does have the same exact pedestal as the 604.  Terrible design.  
The flap handle is on the FO's side forward of the thrust levers when they are at idle.  
So to extend flaps the CA regularly has to reach over, or behind the thrust levers to get his hand in there.  
This can put the CA's forearm directly under the lifting cutoff switches on the thrust levers.  
They are the little red tabs on the thrust levers if you bring up an image.
On a right base like this,  the FO is looking out the right window for the field, not noticing where the CA's arm is.
Pulls the thrust to idle and the momentum of that pull hits the CA"S forearm lifts the switches and into shutoff.  

Even if they put the thrust levers immediately back to idle they wouldn't get a relight.  
Most modern airliners have an auto relight feature.  Not this plane.  
They would have had to turn the ignition on and get enough speed to do a windmill relight.  

There's almost no way they ran out of fuel.  
For one, the crash was heavily engulfed in flames and two the likelihood of not noticing their fuel was low on a 2 hr flight (right?) just seems so unlikely that I'd rule that out.  
They may have had a deferred fuel gauge and just assumed they had enough.  
But typically on a fuel exhaustion on a jet like this, one engine fails first and then the other some time later bc they feed from separate tanks which on that airplane are rarely ever balanced exactly.  
Especially if they ran the APU on the ground bc it just draws from one tank causing an regular acceptable imbalance by default. Just my 2 cents.  Rest in peace brothers.

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Taken from another message board

A few years back there was a skywest crj with the FO flying, he called for flaps and at the precise moment the captains arm was behind the power levers, the FO went to idle thrust. The 2 red paddles hit the captains arm and they went into cutoff.

Can anyone confirm, I know nothing about a 604. If so this could be a plausible explanation.

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Run out of fuel.

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I'll take never happened for $1000.

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https://www.ar15.com/media/mediaFiles/227964/5ai2ou8txu931-2763443888__1__jpg-3125545.JPG

I can see it. Throttles are the levers in the middle and flaps are the lever to the right. The red switches are right under the throttles.

Extensive investigation found that all aircraft systems had functioned normally during the incident flight and it was concluded that the action of the PF in taking both thrust levers below the Idle position at the lower end of the ‘Flight’ range after overriding the mechanical stops designed to prevent inadvertent action to this effect was the cause of the shutdown.

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How long does a re-light take if that were to happen?

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A lot longer than they had at that altitude.

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How the hell you gonna get DEF into this aircraft? The 604 is a single point fueling system, just like the CRJ. And I'm sure the FBO is just as busy as ours was, the prist is put in at the distribution fuel point before it shows up at the FBO.

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This was posted as a comment on the blancolirio YouTube video about this.


https://www.youtube.com/watch?v=4KIaXdxa9yY

I've re-formatted but left the entire text intact.  Seems to me like the most-likely scenario if the information presented about the pedestal, flaps, throttles, etc. is accurate.