Rain Repellant on 737 windscreens
 

A long time ago, rain repellant was withdrawn from service in favour of coated windscreens. That's fine, except coated windscreens are just about useless in heavy rain when compared to a squirt of the old rain repellant.

Talked to someone recently who swears by a commercially available rain repellant for car windscreens called Rainex (five US dollars a bottle) which she wipes with a small piece of cloth on to the windscreen of her 737 before engine start when destination forecast is for heavy rain. Her experience is that it is very effective and has enabled landing in very heavy rain which would normally prevent a safe landing and even a diversion.

Any thoughts on the subject? Another colleague uses the same brand name rain repellant in his 737 and confirmed it makes a remarkable difference in visibility when landing in very heavy rain.

So she uses an unapproved chemical on the windscreen, let's hope it doesn't reduce the integrity of the windscreen so much that it cracks or shatters. I would tell her to stop, if she doesn't then report it to the airline/FAA, until it has been tested and approved for use!:=

Used to sell this stuff in an auto parts store. Always had very positive comments on the product by everybody who bought it. Most saying they didn't bother using their wipers anymore. Wouldn't know the reg's/approvals needed for use on aircraft though...

She owns a 737 ?
 

Call me Mr pedantic, but HER 737 (i.e. is it her property ????)

... I used rainex on a car i had many years ago and found that when you stopped applying it you had problems, I stopped using it and 6 month's later the windscreen had to be replaced as many small "bubbles" had appeared.

Yep always a good idea to carry chemicals in bottles around in ones flight case and into the Flight Deck and then apply these non-approved chemicals to a window that already has a treated surface for rain reppellent. I personally carry a Can of Car Windshield De-ice spray and a scraper to, which is always handy for those frosty winter mornings when I arrive to my 737

What kind of rain is this lady flying through, that the wipers on full chat don't clear enough water for her to see to make a safe landing. If, of course the rain is that heavy, I start thinking Cb and flooded runway, possibly. I really have serious doubts about using non-standard procedures and chemicals. What else does she do that's non-standard?

RainX or other water/misting dispersement products are fine on glass and have no chance of damage however use on Perspex or other acrylics is not recommended

'RainX' works fine as does windshield wipers. I never saw the need to use 'RainX', but some people hate the noise that the windshield wipers make.

I must admit that every aircraft I have ever flown with windshield wipers, when used they are very noisy.

I'm with spinnaker, if the wipers on full don't cut it...get out, but then again its always exciting going down the runway sideways in a 73. I would be more interested in the hydroplanning issue rather than the rainx.

Are you saying that RainX actually eat through the glass to the middle vinyl layer? That is where the bubbles would form?

Standard procedure to remove rain repellant stains from windscreens was to use Coke Cola. However, I never saw it on the approved chemical list either.

Ah, so rainx is perfectly safe on cars, and other road vehicles, but is not safe enough for multi layer aerospace glass strong enough to survive impacts and enormous cabin pressure.

I agree with the posts above!
Make sure you dont take your own bog roll for night flights!! :E

It may be standard procedure where you are to use coke, but it is not an approved procedure or approved chemical. Have you seen what happens leaving coins or metal in a glass of coke. :ugh:

Nobody said anything about leaving the windscreen in a vat of Coke Cola. You clean the rain repellant stains off the windscreen with the Coke Cola and then clean it as usual.

Lots of hysteria about Rain X, at one of our hubs in the Pacific the Airline I work for is so impressed with it's performance in heavy rain they are applying it periodically to the entire 738 fleet.

Flew the 737 for years in the Pacific where blinding rain sometimes meant a diversion of 3-500 miles to possibly similar weather. Rainex was superb and never had problems with windscreen serviceability. The installed rain repellant was also good if the nozzles didn't clog which they often did. If we gave a squirt of repellant we logged it in the maintenance sheet so engineers could clean out each nozzle.

It was well known since the first 737 rolled out that the windscreen wipers were not only annoyingly noisy but also could not cope with anything apart from light rain. The Coca Cola remedy for cleaning away the residue of the installed repellant was excellent. Used that for years with no serviceability problems.

Of course you can always depressurise and open the side windows for a better view and old aircraft like the DC3 and DC4 had storm windows which you could open and get an excellent view through the rain or iced up front window.

So your car has high power, electrically heated (front) windows with polyvinyl butyral (non-glass) interlayers?

Does "rainx" have the same properties as aircraft rain repellent at high altitude and at very low and high temperatures? (Aircraft rain repellant systems have been known to leak from time to time even when it's not raining).

Wasn't aircraft rain repellent banned because of it's toxic qualities? Maybe you should be asking if it's safe to use airplane products on cars? :}

Does Occupational Health and Safety know she's leaning out of an airplane side window? :}

Heated? No. The rest, yes. And certain 20 year old Fords do have heated, laminated front glass.

I've got no dog in this fight but I find it odd you'd not know how a car windshield is constructed. Here in the American West many of us replace them each spring...

Rain Repellent
 

We use a product called
"Rep-con" on our windshields as per the SOP.
It is the same product as "Rain-x" this one just has airplanes on the bottle.
And in the years using it have never seen it to eat either the plastic windscreens of our helicopters,or the glass of our commuters.
And i know for a fact that alot of other companies use Rain-x cause it´s the same product.
Ofcourse one should stick to the SOP, but Rain-x can and never will be as toxic or as corrosive as the standard repellent on big airliners.
Besides as good as coca-cola is, the chemicals that you actually have to use to remove the repellent, is a tad more corrosive and less tasty btw.....:E
Good day