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Rick S.
Joined: 12 Feb 2006
Posts: 347
Location: Las Vegas
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 Posted: Thu Oct 05, 2006 5:58 am Post subject: Grounding was Priming in a confined space |
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After being battered by all the ground safety & QA types in the USAF, then becoming one......hmmmm, funny how that works, I was surprised to see the lack of grounding and bonding procedures in general aviation short of the line truck's cable wheel. I guess when you remove the electrically primed munitions and impulse cartriges from the mix grounding doesn't seem high on the list. I can tell you I have felt head smacking (F-4 centerline tank, bottom of fuselage very close to head) static electricity while pinning up aircraft after flight, prior to shut down. Imagine your surprise when you see that spark jump from the fuel nozzel to the tank opening as your getting ready to pump. I still can't walk up to an airplane without the words, "Aircraft positioned, chocked and grounded" going through my head.
Rick S.
40185
do not archive
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_________________
Rick S.
RV-10
40185 |
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apilot2(at)gmail.com
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| Posted: Thu Oct 05, 2006 6:45 am Post subject: Grounding was Priming in a confined space |
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Substantially more potential for static buildup when you fly Mach 2.
Also much greater potential in dry climates and in heated spaces in
the winter. I used to get jolts in the earpiece all the time when
working in tower cab in Fairbanks AK in the winter, when rel humidity
indoors was in single digits. Reaching for any switch could generate
1-2 inch discharges.
Along same lines, have NEVER understood why fuel truck drivers want to
connect to exhaust stack. Grounding path through exhaust joints and
engine to fuel tanks is a whole lot poorer than from wing tiedown ring
to wing fuel tank. How many are careful to touch fuel nozzle to the
inlet before starting fuel flow, and keep it touching metal while
dispensing? It is the flow of the fuel that creates additional static
buildup, faster the flow, greater the potential.
do not archive
On 10/5/06, Rick <ricksked(at)earthlink.net> wrote:
| Quote: |
After being battered by all the ground safety & QA types in the USAF, then becoming one......hmmmm, funny how that works, I was surprised to see the lack of grounding and bonding procedures in general aviation short of the line truck's cable wheel. I guess when you remove the electrically primed munitions and impulse cartriges from the mix grounding doesn't seem high on the list. I can tell you I have felt head smacking (F-4 centerline tank, bottom of fuselage very close to head) static electricity while pinning up aircraft after flight, prior to shut down. Imagine your surprise when you see that spark jump from the fuel nozzel to the tank opening as your getting ready to pump. I still can't walk up to an airplane without the words, "Aircraft positioned, chocked and grounded" going through my head.
Rick S.
40185
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| | - The Matronics RV10-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV10-List |
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pitts_pilot(at)bellsouth.
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| Posted: Thu Oct 05, 2006 8:44 am Post subject: Grounding was Priming in a confined space |
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More great information. But to answer your question about connecting to
the stacks ..... my tiedowns on the Pitts are sodidly attached to
...... wood. I'll have to admit that I've never thought about the
tiedowns as a grounding point ..... but I will now. Well, DUH!!! I
should have been doing that on the spam cans all along!!! The tiedowns
are usually easier to get to than the stacks sometimes. Thanks!!!
Linn
Kelly McMullen wrote:
| Quote: |
Substantially more potential for static buildup when you fly Mach 2.
Also much greater potential in dry climates and in heated spaces in
the winter. I used to get jolts in the earpiece all the time when
working in tower cab in Fairbanks AK in the winter, when rel humidity
indoors was in single digits. Reaching for any switch could generate
1-2 inch discharges.
Along same lines, have NEVER understood why fuel truck drivers want to
connect to exhaust stack. Grounding path through exhaust joints and
engine to fuel tanks is a whole lot poorer than from wing tiedown ring
to wing fuel tank. How many are careful to touch fuel nozzle to the
inlet before starting fuel flow, and keep it touching metal while
dispensing? It is the flow of the fuel that creates additional static
buildup, faster the flow, greater the potential.
do not archive
On 10/5/06, Rick <ricksked(at)earthlink.net> wrote:
>
>
> After being battered by all the ground safety & QA types in the USAF,
> then becoming one......hmmmm, funny how that works, I was surprised
> to see the lack of grounding and bonding procedures in general
> aviation short of the line truck's cable wheel. I guess when you
> remove the electrically primed munitions and impulse cartriges from
> the mix grounding doesn't seem high on the list. I can tell you I
> have felt head smacking (F-4 centerline tank, bottom of fuselage very
> close to head) static electricity while pinning up aircraft after
> flight, prior to shut down. Imagine your surprise when you see that
> spark jump from the fuel nozzel to the tank opening as your getting
> ready to pump. I still can't walk up to an airplane without the
> words, "Aircraft positioned, chocked and grounded" going through my
> head.
>
> Rick S.
> 40185
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