| Re: Your stuff Erik | <– Date –> <– Thread –> |
From: Peter Rychel (dino308gt4 hotmail.com)
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| Date: Sat, 25 Jul 2020 23:24:04 -0700 (PDT) | |
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Thanks! Yes, I watched the AgentJayZ explanation video as well (https://www.youtube.com/watch?v=6rj3mrJalmw). Okay, so nothing to do with fuel, or it’s additive, purely mechanical (regulating compressor pressures for different stages of power delivery). Although, no explanation why the check valve corrodes in the first place. Peter Sent from Mail for Windows 10 From: Rick Moseley 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.
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 Sent from
Mail for Windows 10 From:
Rick Moseley 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 Sent from
Mail for Windows 10 From:
Erik Nielsen And boom. Happy flying!
_________________________________________________________________ |
- Re: Your stuff Erik, (continued)
- Re: Your stuff Erik Peter Rychel, July 24 2020
- Re: Your stuff Erik Clarence Romero Jr., July 25 2020
- Re: Your stuff Erik Rick Moseley, July 25 2020
- Re: Your stuff Erik Lashdeep Singh, July 25 2020
- Re: Your stuff Erik Peter Rychel, July 25 2020
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