Aircraft Fluids and Their Function

Aircraft fluids (the basics).
Ladies and gentlemen, as I said in the video, this is a very basic explanation of the most common fluids that we use in aviation
There are many varieties of these fluids, and additionally, other fluids and greases that are used on aircraft. All of the fluids have expiration dates as well as MIL specs numbers. when fluids are used and old fluid is taken out, there’s also a proper way of disposing them.
One important thing to remember is to please wear your safety equipment when you are handling and working with these materials.
That’s about it, I’m sorry I couldn’t go into more detail on individual fluid, but I think you get the idea. Thank you for watching, and have a beautiful day.
, oh, and a sidenote, tell me which fluid you hate the most 😅😂
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[@miguelsuarez8010]

You forgot the most important fluid on the tarmac: coffee!

[@StigAviation]

You are absolutely right 👌

[@chrisnicholls8636]

Great to see the different oils and their uses on the airplane, also their different colours. Thank you Stig

[@StigAviation]

My pleasure!

[@nicholaspike5656]

I was just watching your last video and this popped up! Love your videos, it's very cool to see what goes on behind the scenes to keep these magnificent aircraft airworthy. Thank you for sharing your fascinating job with the world!

[@StigAviation]

Glad you like them Nick..thank you for being here

[@stenic2]

Very nice explanation, there are few A&P channels but yours is the one I enjoy most!

[@StigAviation]

Thank you so much for being here.

[@AvStevieStevenJamesDrums]

Stig, it’s so awesome you are educating us more frequently. I so look forward to your new segments. Thanks again. AvGeek Steve

[@StigAviation]

More to come! Thank you Steven

[@sprinklersolutions3247]

Your videos are a great alternative to all the BS on mainstream TV these days. Thanks for all of the great content. Cheers!

[@StigAviation]

Wow, thank you. I’m truly grateful I can show a part of aviation maintenance

[@andreweppink4498]

Stig's right. Turbine oil's changed only in cases of gross contamination. The oil used in marine and power plant steam turbine's wilI go for years with proper straining, filtration, centrifuging and coalescing etc. Unlike diesels etc. it's not directly exposed to combustion products, which makes a big difference. The only reciprocating engines having that characteristic are the big marine crosshead engines which have no wrist pins, instead using a straight piston rod, like the old steam locomotives.

[@StigAviation]

Thank you for all this additional information. Much appreciated

[@darshanadeepal2974]

Woww....nice video..thanks

[@StigAviation]

Most welcome

[@afterburner119]

It’s also wild with Turbine oils, we get every Mfr. under the sun pay for testing to “approve” for use. Still today we work oil carts for older engines like the PW4000.

[@StigAviation]

ohh man you giving me PTSD saying PW4000 i cant stand that engine lol

[@philiproseel3506]

I was doing a pre-departure walk-around on an Alaska MD-80 at LAS over a decade ago. It was raining and as I walked under the tail, I looked up and a drop of something hit my face near my eye and started burning like crazy. One of the maintenance guys said, “Ooh, Skydrol!” 😂

[@StigAviation]

😅😂. Ya good old skydrol never fails to fall right in the eyes.

[@superskullmaster]

In the military world that “strut fluid” is one of two types of hydraulic fluid.

[@StigAviation]

That’s interesting.. what type of aircraft may I ask you maintained?

[@superskullmaster]

@@StigAviation I was AGE (aerospace ground equipment) but I supported C-17’s at my main base and two deployments to Al Udeid supporting combat ac.

[@StigAviation]

@@superskullmaster absolutely incredible. Thank you for your service and dedication to aviation.

[@superskullmaster]

@@StigAviation 🫡

[@SuburbanDon]

I like seeing aircraft guts. Keep 'em coming.

[@StigAviation]

Will do 👍

[@suhailummer2697]

❤❤❤

[@afterburner119]

When we run TR Development we get Skydrol in 55gal. Drums. During NEO HCF testing, the overflow tank sprung a leak and I watched my operators boots melt on the test stand. 😂

[@StigAviation]

lol lol yup skydrol will eat everything...literally everything beside metal

[@chrnc]

Skydrol leaks that make a fine mist are the best

[@StigAviation]

And it’s spicy too 😂

[@Joe-bm4wx]

5606 is what we use as hyd fluid in military aircraft. Never seen purple hyd fluid before.

[@StigAviation]

Yup MIL-5606 is used a lot in military. But in commercial aviation they use Skydrol. Higher pressure and temperature thresholds.

[@777Kills]

That purple fluid looks so tasty and the fuel looks like delicious lemonade😂

[@StigAviation]

Looks good. … feels and tastes horrible 😂

[@mrgreen4688]

love this. i am a passenger only but love to know how all this works!

[@StigAviation]

I’m glad you enjoy it and have an inquisitive mind.

[@nunobarros3629]

Next one…types of grease!!!!! Whatddya think, Stig?! With special attention to Aeroshell 33. (AKA: Cochroach cream)

[@StigAviation]

Will get to work on that video 👍

[@cjswa6473]

Surprised sydrol didn't eat thru the cup😮. Just kidding. I use Granville strut seal instead of 5606 for Struts..

[@StigAviation]

If I left it in there for another hour the cup would have melted 😂

[@fatbudgiekillen8997]

Love your channel 🛫🛬

[@StigAviation]

Thanks so much!!

[@Aleksandar6ix]

When did Skydrol start being used? At school 25 years ago I only ever learned about the red stuff for hydraulics. (Haven't worked on an aircraft since)

[@StigAviation]

Skydrol has been used for decades. Would you’re talking about is also hydraulic fluid, it’s called 5606. That’s meant for more low pressure components, Skydrol is meant for high-pressure components ending up to 3000 to 5000 psi

[@Aleksandar6ix]

@@StigAviation yeah, Mill- H5606 I remember that number to this day! I just never learned about the purple stuff 💜

[@partydemon2849]

Going for my cert right now, were doing cabin control systems. Could you possibly preview some of the systems?

[@StigAviation]

Absolutely. Got a video for that already. I’ll post it this weekend

[@partydemon2849]

Awesome

[@Lion_McLionhead]

Surprised 1 guy refuels the plane but a different guy sumps the tanks & adds oil. Very strict division of labor.

[@StigAviation]

Fueling and maintaining an aircraft are very different set of skills.

[@andrijasaviccsavic1124]

I didnt quite understand what you said, is MIL 5606 used just for cleaning struts or it is used as oil inside oleo pneumatic strut?

[@StigAviation]

There’s a separate type of fluid for the olio pneumatic struts. It’s almost the same. It just has a different mil spec number.

[@bige.3474]

We use CastrolAero 40 in our struts. It's just another name for MIL 5606.

[@andrijasaviccsavic1124]

@@bige.3474 oh okay, thanks

[@blackmusik109]

I love the smell of fresh blue juice

[@StigAviation]

😅

[@HaNguyen-if7sy]

Can you answer two questions for me, please? Can you tell me how often to change the hydraulic oil? Or just fill the reserve and when it detect contamination so drain the reserve, right? Could you please tell me how often the hydraulic sampling valve is maintained in the field (after how many hours) and what type of check it is (check A,…)?

[@StigAviation]

Hydraulic fluid usually does not get changed, usually we’re just servicing it in case we find it low due to seepage. If we do have to change hydraulic fluid, it’s usually done because of contamination or if it’s a very heavy service check such as D check. Hydraulic sampling is done on periodic basis, most of the time on A checks and C checks or whenever the manufacturer calls for it.

[@starbai410]

Mmm 😋 purple Koolaid

[@StigAviation]

😂 keep it off you

[@nathanschock5114]

Yup

[@StigAviation]

👍

[@BeardedFordTech]

JP8 jet fuel?

[@StigAviation]

JP* is military grade...this is JET A commercial grade

[@BeardedFordTech]

@StigAviation yeah only reason I asked is I used to contract on a military base and we worked on fuel trucks and everything in between. Anything that had a diesel engine ran JP8. And I mean anything

[@StigAviation]

copy that

[@BeardedFordTech]

@@StigAviation 💯💯 keep up the awesome content

[@trevorbrewer7906]

Aircraft mechanic will always wash hands before and after the bathroom. Not nice getting skydrol on the man or girly bits😢

[@StigAviation]

This is 100% fact 👌

[@kaamfinitii]

Ahhh yes engine oil burning just like a VQ engine

[@StigAviation]

Pretty much!

[@andrewharig5680]

Kool aid anyone

[@StigAviation]

Definitely don’t drink the Kool-Aid

[@andrewharig5680]

That's exactly why I don't drink coolaid lol 😆