When do you use Prist?

C150J

C150J

Well-Known Member
Hi Guys,


I'm aware that some aircraft require Prist, but for those that don't:

- What type of aircraft do you fly?
- What conditions make you order Prist?
- Does your company have a policy concerning Prist usage?


Just an informal survey. I figured I'd ask it in the Corp/Frax/Charter forum because this sector if the industry has more control over fueling.

Thanks!
J.
 
Our fuel truck is premixed with prist so when we are on the road we get it without. I'll have to look at the chart again but I am pretty sure it needs to be -40° C. before it is needed in the King Air anyway.
 
Neither the Citation Bravo's nor Lear 40/45's that I fly need Prist because they both have other means to prevent freezing. We do not have a policy about ordering Prist (for antifungal - or is it antibacterial (?) - purposes) because we've found that there are enough places that premix that we get it often enough as is. Policy is to always order "negative Prist", then accept premix if that is the only option.
 
SteveC said:
Neither the Citation Bravo's nor Lear 40/45's that I fly need Prist because they both have other means to prevent freezing. We do not have a policy about ordering Prist (for antifungal - or is it antibacterial (?) - purposes) because we've found that there are enough places that premix that we get it often enough as is. Policy is to always order "negative Prist", then accept premix if that is the only option.
Click to expand...

I read somewhere that they changed the chemical compounds so it doesn't have the antimicrobial part.
 
Piaggio P-180.
Order it every time. We have no fuel heaters, so we have to have it. There is an exception if we absolutely can't get it, but it's severely altitude limiting (I'd have to read the manual to remember what the limitations are).
 
King Air 200.

Always.

Because if you haven't been using it at all and then suddenly one day you need it, the fuel in the tanks that was leftover from the last trip doesn't have it. So the fuel with prist that you are putting in gets mixed with non prist fuel and your ratio on prist to fuel is now way lower than what the standard calls for, and you could run into a situation like this: http://aviation-safety.net/wikibase/wiki.php?id=59012
 
SteveC said:
Neither the Citation Bravo's nor Lear 40/45's that I fly need Prist because they both have other means to prevent freezing. We do not have a policy about ordering Prist (for antifungal - or is it antibacterial (?) - purposes) because we've found that there are enough places that premix that we get it often enough as is. Policy is to always order "negative Prist", then accept premix if that is the only option.
Click to expand...

Same here on Hawker 700/800's
 
King Air 90

Dont need prist because of the Fuel/Oil heat exchanger. However company still occasionally use it to as a antimicrobial agent during the winter months (although I have heard that the EPA changed prist's properties so that its not really useful in that area).

Instructor at Simcom showed me where Prat and Whitney's engine manual stated that its not useful or needed in the King Air 90B
 
I use prist for my windows.







Seriously though, no prist in the BE-99 because of the oil/fuel heat exchanger.
 
Beatchjet - Always. Even the XPs that supposedly have fuel heaters (ok, I'm sure they do). Options had a couple go extremely quiet a few years back. Not lookin to gamble.

Pilatus - ALWAYS. Couple of them have gone quiet, too, and no relight.

Mitsi - Never. Not in the POH, and the thing doesn't go high enough for it to matter much. Or so I hope.

In short, I follow the FOM/POH to the letter. And if I'm not sure what the book means, I order Prist. I do try to keep costs down (part of the job), but if it's between somebody throwing down an extra $20 or me wondering whether the fans are going to keep spinning, I become very liberal with their checkbooks. In the end, they'd thank me for it.
 
Cessnaflyer said:
I read somewhere that they changed the chemical compounds so it doesn't have the antimicrobial part.
Click to expand...

In the late 80's the company removed the anti-microbial compound from PRIST due to cost. New EPA rules at the time forced the company to stop puttiing it in their PRIST.

That having been stated, the Icing-Inhibiting chemical in PRIST does SLOW fungal growth. Because it only slows the growth process rather than actually stopping or killing the growth, it is inefficient and can no longer be classified as Anti-Microbial.

This is one reason that a lot of airplane AFMs recommend an Anti-Microbial additive. I don't get a commission by endorsing the product. Our Citations don't require an Anti-Icing additive however, IAW the AFMs, we use Bio-Bor in our CJs, Mustangs, and Caravans.
 
SteveC said:
Neither the Citation Bravo's nor Lear 40/45's that I fly need Prist because they both have other means to prevent freezing. We do not have a policy about ordering Prist (for antifungal - or is it antibacterial (?) - purposes) because we've found that there are enough places that premix that we get it often enough as is. Policy is to always order "negative Prist", then accept premix if that is the only option.
Click to expand...

As stated above, Lear 40/45's don't require, however we do add Anti-Microbial once a month.
 
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