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nuckolls.bob(at)aeroelect
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 Posted: Thu Feb 28, 2019 8:46 am Post subject: Static Wicks - Bonding of Flight Controls |
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At 10:21 PM 2/27/2019, you wrote:
| Quote: | --> AeroElectric-List message posted by: "jsajpf" <john.friday_adis(at)sbcglobal.net>
Bob (et al),
Looking for insight into legacy Type Certificated airplane design rationale for installing static wicks and bonding jumpers between fixed structure and movable flight control surfaces. |
Selecting style, number and placement of
static wicks on a TC aircraft is an arduous
task made possible by a survey of the ship's
natural streamer locations . . . which
may or may NOT be in the same locations
for similar aircraft. We used to bolt
static wicks to some models at Cessna . . .
as I recall it was a kit that a customer
could order. But I'm 99% sure there were
no electro-static survey tools used to
optimize the location of wicks much
less confirm their efficacy.
| Quote: | | Several E/AB designs do not specify installation of static wicks nor bonding jumpers for flight control surfaces. The particular design I plan to build is among this group and reports from those with years flying the design are (albeit a limited number of respondents): no issues with P-static and the like. |
Then I wouldn't worry about it. P-static
issues are rare in the OBAM aircraft world.
We just don't spend much time cruising at
300 knots through rain, snow or ice
crystals.
| Quote: | I cannot attest to the types of operations, nor how frequent the exposure to conditions conducive to P-Static interference, for the respondents to my query.
Looking for input from TC house folks (Bob) regarding rules of thumb, design standards, etc. regarding incorporation of static wicks and bonding??
My experience with the subject matter is as a maintainer, troubleshooting reports of symptoms of P-Static while in visible moisture, required inspections after a lightning strike, routine verification (inspections) of electrode-to-surface bonding values, etc. Correction of broken or degraded control surface bonding cured the majority of reported faults. Some degraded antenna bonds are among the mix as well. Design standards applicable to mitigating P-Static trouble are not clear to me and my understanding of design criteria/recommendations is admittedly academic (at best).
What say ye, the sage?! |
I wouldn't bolt any hardware to the
airplane until experience suggests
it might fix a demonstrated difficulty.
Bob . . .
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jsajpf
Joined: 21 Feb 2019
Posts: 8
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| Posted: Thu Feb 28, 2019 4:33 pm Post subject: Re: Static Wicks - Bonding of Flight Controls |
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Sounds like wisdom to me Bob. Thanks for the response!
John
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