Forum: F-35 Design & Construction

Wow you guys had 'clean' rags down under? Luxury.

OK one more story about why hydraulic fluid gives me the shivers, then I'll shut up for now.

One rainy day working with a new guy we were doing a checkout of a couple if items and he failed to tighten something correctly on a hydraulic system above us (not uncommon - sealing the systems correctly is part skill, experience, luck and voodoo magic). Many of the leaks won't leak at all until you put that portion of the system under load for a while then shake the assembly abit. In the rain we didn't notice that some of the liquid coming down was red. I only got soaked on the arms but he was soaked right through jacket, thermal liner, bdu shirt, tee shirt to the skin. Nasty stuff. It's so oily slick and doesn't behave like water so it can drip on you without you even feeling it. Afterwards the only thing you can do with those clothes is burn them. SAC didn't accept showing up for duty wearing oily rags.

Go Electrons! Wink

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Last edited by spazsinbad on Jun 02, 2012 - 07:25 AM; edited 1 time in total

I thought of stating truthfully 'clean oily rag' but did not want to disrespect our fine RAN FAA Maintainers. Very Happy

The A-4 Skyhawk has an AFT (worse) and FWD [under fuselage] 'HELL HOLE' where such drips from all kinds of fluids were a real hazard. A nightmare if engine running!

Some more 'dual' EHA specific info from previously mentioned PDF on previous page....

AIRCRAFT SURVIVABILITY Spring 2012

http://www.bahdayton.com/surviac/asnews ... V9_web.pdf (2Mb)

JSF Full Up System Level Testing F35 Flight Critical Systems Test by Chuck Frankenberger

...FCS Architecture : No cheap Kills
One of the newer technologies in the F35 is the Electrohydrostatic Actuators. These actuators contain a self-contained hydraulic system. There are two types of actuators on the aircraft: simplex and dual tandem. The dual actuators have redundancies built in, including dual communication and power paths. The dual actuators were ballistically tested and showed good tolerance to damage. The redundant systems are isolated, and damage on one side did not propagate to the other side....

...Conclusions
The FUSL testing conducted on AA-1 was very successful meeting all defined test objectives and success criteria. Addressing synergistic effects, the electrical power and flight control systems successfully isolated failures and protected the redundancies built into these systems, allowing continued safe flight. The VSN architecture is robust, providing multiple paths to transfer data. Testing highlighted that fire is a significant threat to flight critical systems.

The test team was able to verify that the actual ballistic damage response correlated very well to previous pilot in the loop simulator testing. Over the course of the test program, the LFT team witnessed firsthand the robustness of the F35 flight critical systems, no cheap system kills."

So, is it safe to say that this tech will be the norm, from now on for military aircraft?

Unless it turns out not to be? Very Happy

I can only view the past.

spazsinbad wrote:

Unless it turns out not to be? Very Happy

I can only view the past.

Well, I'm wondering how long it will take the Russians and Chinese to switch to the new tech?

popcorn wrote:

spazsinbad wrote:

Unless it turns out not to be? Very Happy

I can only view the past.

Well, I'm wondering how long it will take the Russians and Chinese to switch to the new tech?

If China does't already have them in production (down to the serial numbers) it'll just be a matter of time. They undoubtedly have the CATIA files.

ElectroHydroStatic Actuators ... I like them already because it sounds like a Pointy Head function to R2 Laughing