Very cool! On Jul 25, 2020, at 14:43, Rick Moseley <ramosel [at] pacbell.net> wrote:
Peter, here's a good explanation from a good friend, Juan Browne, almost neighbor (next mountain town over) and ex-Military "heavy" pilot... now an Airline pilot. He referenced AgentJayZ, another Canadian who rebuilds historic Jet engines on youtube. Hopefully he'll post something soon too. Lash, if you are reading this, Juan used to fly with "Sparky" Drewsaster on Starlifters.
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On Friday, July 24, 2020, 10:40:41 PM PDT, Peter Rychel <dino308gt4 [at] hotmail.com> wrote:
So, more potential from fallout in the environment than fuel additive.
In regards to that, It’s mixed in a ratio of 1300ml to 1000L of fuel. Basically, not a lot.
Obviously, this valve must be constructed of rather sensitive materials (exotic metals?) to degrade within days. I find that quite alarming...
Peter
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Good question. Good association. Most likely not. (never say never)
This bleed air valve in a jet is in the compressor section of the engine, ahead (upstream) of the combustion chambers and the turbine section. There should never be an
combustibles (with said solvent) in the compressor section. Now, if the bleed valve is sticking open, when you back off the throttles you can get a compressor stall... and a potentially a "backfire" type condition... engine starts banging and may eject some
combustion materials out through the compressor. cLyDe says he also had a fire indication. So it is possible your contaminates could get to the bleed air valve, but the valve has already stuck open before the condition occurs which caused the ejection.
Does that make sense in the flow pattern?
Hmmm... Try this: for the corrosive to get to the bleed air valve, the valve would have already had to fail and that creates a condition that would let the corrosive get
to the valve.
From what I know... what I've been hearing... the sticking is being caused by dis-use for a few months while planes were parked during the lockdown. cLyDe filled me in
on the model of GE engine involved and it's primarily certified on older versions of 737.
On Friday, July 24, 2020, 10:00:53 PM PDT, Peter Rychel <dino308gt4 [at] hotmail.com> wrote:
Saw this on the (Seattle) news this evening.
So how would this valve corrode? As I’m involved with aircraft refueling equipment, I do installations and repairs on jet fuel additive
systems. Methyl Carbitol is injected into the stream of jet fuel being delivered to a plane. This substance is used to prevent icing up of the fuel at high altitude. Problem is, it never dissolves into the fuel, it stays in suspension AND is highly corrosive.
Even we’re not immune as we have to warranty pressure transducers we’ve installed (to display when each injection happens) because they got eaten up by the stuff.
They mention this as a “...engine bleed air 5th stage check valve...”. Does this have anything to do with that additive?
Peter
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On Jul 24, 2020, at 9:03 AM, Erik Nielsen <judge4re [at] gmail.com> wrote:
We commented that if it is Boeing, it ain’t going.
They had little paperclips made in the shape of the 737 Max. In a review meeting with senior executives, I joked that it was just one
more plane that they built that couldn’t fly. I was promoted two weeks later...
I remember the old Flying Bus driver adage... "If it ain't Boeing, I ain't Going".
Now you see Boeing's name attached to anything and you just wince a bit and avert your gaze.
https://www.defensenews.com/land/2020/07/23/canceled-missile-defense-warheads-cost-tripled-schedule-slipped-despite-numerous-warnings-gao-finds/?utm_source=Sailthru&utm_medium=email&utm_campaign=EBB%2007.24.20&utm_term=Editorial%20-%20Military%20-%20Early%20Bird%20Brief
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