Forum: F-16 Procedures

Excessive misting in the cockpit



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asiatrails
PostPosted: Mar 20, 2009 - 02:18 PM Reply with quote Back to top
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outlaw162 wrote:
These days, with all the information presented inside the cockpit and considering how little a fighter pilot has to actually look outside the cockpit anyway, I’m not so sure an occasional fogged up canopy is that big of a deal.

I could see, however, where the humidity could present a potential problem as far as some of the pilots' eyeliner.

OL


Ding - Rimshot - drumroll please Maestro.

Sounds like most of the people here are on the right track looking at the sock or moisture trapped in the system. If it was one jet I would suspect a component but as the poster said the entire fleet then we are more likely to be looking at a local environmental issue.

Take a good look at the hard plumbing for low/trap points if you have access to engine drying equipment you could consider using that to try to dry out the low points.

On other aircraft, dirty socks can leave enough crud behind that you will go through a couple of new ones to capture all of the crud and make the system start behaving again. A good stock of high humidy socks might be the way to start going.

A key question to consider is have the aircraft always done this or is it something that has come with time? If the system worked when the aircraft were new then its probably a mix of maintenance/operational use/environmental.
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BouliNDSO
PostPosted: Mar 20, 2009 - 03:40 PM Reply with quote Back to top
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What could be going on is this: The water from the water separator is taken through a small duct to the regenerative heat exchanger, there it will be sprayed over the inside of this heat exchanger and then leave via the underside of the aircraft outside. It happened to me once were that duct on the top of the regenerative heat exchanger was clogged. So the water could not go outside therefore that water was transported to the cockpit (and avionics). Maybe you could take a look at that duct coming from the waterseparator to the regenerative heat exchanger. On top of that regenerative heat exchanger is a small venturi, that can also be obstructed.

Cheers
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simonlwa
PostPosted: Mar 21, 2009 - 07:05 AM Reply with quote Back to top
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BouliNDSO wrote:
What could be going on is this: The water from the water separator is taken through a small duct to the regenerative heat exchanger, there it will be sprayed over the inside of this heat exchanger and then leave via the underside of the aircraft outside. It happened to me once were that duct on the top of the regenerative heat exchanger was clogged. So the water could not go outside therefore that water was transported to the cockpit (and avionics). Maybe you could take a look at that duct coming from the waterseparator to the regenerative heat exchanger. On top of that regenerative heat exchanger is a small venturi, that can also be obstructed.

Cheers


Well. I guess you are talking about the aspirator nozzle? we did a check and found it clogged initially and indeed it was clogged. However, after removeing the clogged dirt, the situation did not improved much. Well, I think it could be an addition of some components failure and contributed to this problem.
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