Timeline for Why is the most common hydraulic fluid so poisonous?
Current License: CC BY-SA 4.0
15 events
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| Apr 3, 2021 at 21:22 | comment | added | DKNguyen | @Landak Little parts like little bolts and screws. Plus not everyone working a plane around the fluid is a mechanic. Avionics tech, for example, little wires and such. Even with those kinds of gloves it can be a pain. Also, secondary transfer from people not wearing gloves. That said, I never worked as a tech. I just know that even on freezing days the work they were doing did not allow for gloves. | |
| Apr 3, 2021 at 12:10 | comment | added | Landak | @DKNguyen --- regarding washing hands before going to the bathroom, why don't mechanics wear gloves? Relatively impermeable gloves are available -- e.g. camlab.co.uk/1212979-shieldskin-chem-red-neo-nitrile-300-gloves -- which have a soak through time on the order of ~500 minutes for phosphoric acid, and in my experience still permit manual operations with good dexterity (at least compared to leather cryogenic or riggers' gloves and similar). Compared to the cost of an aircraft or a mechanic, they are comparatively cheap. Why don't you wear them? | |
| Apr 3, 2021 at 4:39 | history | edited | OSUZorba | CC BY-SA 4.0 |
I removed two leading paragraphs that were facturally incorrect on how hydrualic systems work on the majority of commercial aircraft.
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| Apr 3, 2021 at 4:36 | comment | added | OSUZorba | The first two paragraphs are wrong. All Boeing aircraft except the 787, and all Airbus aircraft except the A380 and A350 use Air-On-Oil reservoirs. Bleed air from the engine pressurizes the fluid in the reservoir and there is no barrier between the fluid and air. A check valve is used to prevent fluid from back flowing into the bleed system, but it has happened. Pumps on large aircraft receive their fluid from pressurized reservoirs, not accumulators, which are used to store hydraulic energy. | |
| Jan 13, 2020 at 22:17 | comment | added | John K | Wow. That's a pretty bad design. They systems I'm familiar with have no such access path for fluid. Very interesting thanks. | |
| Jan 13, 2020 at 19:31 | comment | added | Jan Hudec | Actually, I should have linked Qantas A332 at Sydney on Dec 15th 2019, hydraulic leak prompts evacuation. The cause of that one was clearly hydraulic fluid, and there is a comment (from Dec 16th 2019 14:48Z) talking about the line (updating the question; it's too long for comment). | |
| Jan 13, 2020 at 2:14 | comment | added | John K | No, as a lead scavenging agent (ALCOR) it's been around for decades and that's what it was originally developed for. It was discovered it had anti-scuffing properties when added to oil later (creates a sacrificial oxide layer). The Lycoming TCP product is PN LW-16702 in a little clear bottle. It was always some mystery liquid and I found out it was TCP only a few years ago. | |
| Jan 13, 2020 at 2:08 | comment | added | UnrecognizedFallingObject | @JohnK -- yeah, not surprising that it's been around for a while as part of oil | |
| Jan 13, 2020 at 2:08 | comment | added | John K | @UnrecognizedFallingObject Thanks But...TCP has been around forever. Developed for the B-36 IIRC alcorinc.com/wp-content/uploads/2012/06/… | |
| Jan 13, 2020 at 2:01 | comment | added | UnrecognizedFallingObject | I don't believe TCP was ever used for lead scavenging in fuel (that's EtBr2's job). Other than that, very good answer | |
| Jan 12, 2020 at 23:21 | comment | added | John K | @DKNguyen yes. See my comment on the question post. On somewhere like a rear spar, or in a landing gear bay where you have hydraulic actuators and a lot of turbulent air, if any fluid seeps out of dynamic seals of the acuator it gets distributed everywhere you have a greasy film of it on everything, | |
| Jan 12, 2020 at 22:55 | comment | added | DKNguyen | Is Phosphate Ester the reason I was told in avionics class to always wash your hands BEFORE going to the restroom? I was told everything is covered in a clear, thin film that feels like...burning... | |
| Jan 12, 2020 at 21:02 | comment | added | Fattie | damned knowledgeable answer! | |
| Jan 12, 2020 at 17:08 | history | edited | John K | CC BY-SA 4.0 |
added 5 characters in body
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| Jan 12, 2020 at 16:40 | history | answered | John K | CC BY-SA 4.0 |