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Old 05-12-2020, 02:43 PM
Caummisar's Avatar
Caummisar Caummisar is offline
Join Date: Jun 2007
Location: Idaho Falls, ID
Posts: 142
Talking Safety Wire Screw Clamps

While looking at a builder's website, I notice he/she had safety wired SS screw clamp screws. Is that standard practice? If yes, then why didn't I know?
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Last edited by Caummisar : 05-12-2020 at 03:29 PM. Reason: added photo
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Old 05-12-2020, 02:58 PM
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scard scard is offline
Join Date: Jun 2005
Location: Cedar Park, TX
Posts: 3,368

Way back in the beginning I did. I haven't found the need since. I'm not sure who I thought I was going to impress . Oh, I guess there was that OSH judging thing.
Scott Card
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Old 05-12-2020, 07:03 PM
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OZCleco OZCleco is offline
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Location: Maylands, Western Australia
Posts: 60
Default Perhaps an airline A&P?

If memory serves me correctly for the older airframes, this was standard practice on P3, FA18 and A320 pneumatic systems, although those clamps were a completely different heavy duty type design.

If I still had access to airbusworld I'd have a quick look at the AMM to confirm.

I've kept that up on our RV9A / O-320, validated by finding multiple loose clamps on initial receipt of the aircraft.

Whatever gives you confidence to fly over long stretches of water, and it's a safe practice regardless.

(Coming from the airline world I was gobsmacked to see what is and isn't safetied. It's like working on tractors)

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Old 05-12-2020, 07:40 PM
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bjdecker bjdecker is offline
Join Date: Jun 2005
Location: Georgetown, TX
Posts: 950

I've wondered about the need -- couple of thoughts:

Not all clamps are created equal. Note the difference in the shape of the slots cut in the band -- genuine Breeze Aero-seal clamps are "D" shaped which matches the profile of the screw much better than other clone clamps.

see and for comparison.

Most fasteners that should be wired have a hole drilled in the head or shank ("Put wire here...") -- running the wire over the slot seems to be a solution looking for a problem.

So, unless you really like safety wire, poking/scratching yourself - I'd leave it off.

Just my opinion - I'm not an expert.

Brian Decker
RV-7 (Flying)
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Old 05-12-2020, 07:57 PM
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9GT 9GT is offline
Join Date: Jan 2010
Location: Southern Michigan
Posts: 2,180

Years ago my buddy had one vibrate loose on the exhaust heat muff on the Cozy MKIV. We found it during a condition inspection. If it had come fully off, it would have gone right through the prop, so I safety wired most of the worm clamps on the RV-10 "just in case". Not sure I will bother on the 9A.
David C.
Howell, MI
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Old 05-12-2020, 09:38 PM
JDeanda JDeanda is offline
Join Date: Apr 2013
Location: Ventura, CA
Posts: 273

I had a hose clamp on the Vetterman exhaust system come loose on our RV-6, so I safety wired it. I’d never seen a worm-drive hose clamp with safety wire on it before, but it stayed tight. I suppose it came loose because it ran so hot and then cooled back to room temp over and over. I’ve since redesigned that connexion with a different clamp, so no more problems. But I’ve never had a problem with the ones on the Lycoming intake tubes.

Last edited by JDeanda : 05-13-2020 at 05:10 PM.
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Old 05-13-2020, 06:27 AM
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Rick_A Rick_A is offline
Join Date: Oct 2005
Location: Jacksonville, FL
Posts: 1,572

If you are doing a thorough check FWF every time you change the oil, I don?t see the need for safety wire on clamps.

I include checking clamps as part of my regular maintenance at every oil change, which I do at 25 hours. Nothing fancy, I just put a screwdriver or nut driver on them and snug them up if they need it.

My only exception is the clamp the secures my purge valve cable to the bracket. I have safety wire on that clamp. In this case the wire acts as a backup to the clamp itself.
Rick Aronow,
Flying 7A Slider;
Jacksonville, FL
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Old 05-13-2020, 06:40 AM
noelf noelf is offline
Join Date: Nov 2007
Location: Solomons, MD.
Posts: 1,258

The only hose clamps I have safety wired are the ones holding the EGT probes.
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Old 05-13-2020, 07:02 AM
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Saville Saville is offline
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Location: KBVY Massachusetts
Posts: 1,261

I safety wire mine.
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Old 05-13-2020, 09:37 AM
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Chino Tom Chino Tom is offline
Join Date: Jun 2005
Location: Chino, CA
Posts: 739

Originally Posted by Saville View Post
I safety wire mine.
+1. I do the same.
Tom Prokop
Chino, CA
RV-8A,180/CS/Carb, AFS 4500 EFIS/EMS
RV-6, sold, 820 hrs of fun.
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