Replace a weld on landing gear strut?

[tawadc95]

Re: Replace a weld on landing gear strut?

I can't tell if it is an optical illusion or the tube actually does have a kink in it somewhere but the shadow line on the towel at the bottom of the tube seems to indicate a kink as well.

[mhorowit]

Re: Replace a weld on landing gear strut?

Argyle would be nice.
Why is the bushing deformed? From the inside or the outside?

Mystery solve; actually a two parter...
First, the bolt won't fit because the bolt I was trying to use came from the landing gear pictured and it is larger than the bolt used in the salvaged landing gear. 20/64th vs 24/64ths, so I guess sometime in its life the (pictured) landing gear got re-sized. That means in order to use the salvaged strut, I'll need to have the bushing hole reamed to 24/64ths. BTW, the bushing appears to be deformed from wear; I found the bolt that went with it and it was loose.

Now comes two new questions: after enlarging the hole, how much bushing wall will have to remain before it would be declared too thin? You know, I think I need to look and see if the strut attach holes are whollowed (sp?) out; that could complicate things.

Next question would be: how do I setup to insure the axis of the reamer is parallel to the axis of the existing hole?

Geeze, one adventure after the other - MikeH

[jdoran]

Re: Replace a weld on landing gear strut?

Mike,

Howz about just replacing the bushing?

[Howard Wilson]

Re: Replace a weld on landing gear strut?

Is the "bolt that went with it" worn or bent?

[Guest]

Re: Replace a weld on landing gear strut?

Mystery solve; actually a two parter...
First, the bolt won't fit because the bolt I was trying to use came from the landing gear pictured and it is larger than the bolt used in the salvaged landing gear. 20/64th vs 24/64ths, so I guess sometime in its life the (pictured) landing gear got re-sized. That means in order to use the salvaged strut, I'll need to have the bushing hole reamed to 24/64ths. BTW, the bushing appears to be deformed from wear; I found the bolt that went with it and it was loose.

Now comes two new questions: after enlarging the hole, how much bushing wall will have to remain before it would be declared too thin? You know, I think I need to look and see if the strut attach holes are whollowed (sp?) out; that could complicate things.

Next question would be: how do I setup to insure the axis of the reamer is parallel to the axis of the existing hole?

Geeze, one adventure after the other - MikeH

Something is wrong here.

That bolt and hole is 3/8" as I recall.

24/64= 3/8 so that makes sense.

The other bolt is 20/64 or 5/16" where did that come from?

Or do I remember it backwards and the standard bolt is 5/16?

Thoughts?

[Guest]

Re: Replace a weld on landing gear strut?

Mike,

Why do you think its okay to ream that hole oversize?

You need some data that authorizes what you are doing.

Dave

[Forrest Barber]

Re: Replace a weld on landing gear strut?

THAT photo of your weld is unacceptable. The proper repair is to replace the tie strap completley. Weld at top, bolt at bottom. OR use the inside splice method at the top of the tie strut according to 43. I am checking on the out side splice method in that situation, uglier but easier to do. WE have four gears here now that need repair.

[Guest]

Re: Replace a weld on landing gear strut?

THAT photo of your weld is unacceptable. The proper repair is to replace the tie strap completley. Weld at top, bolt at bottom. OR use the inside splice method at the top of the tie strut according to 43. I am checking on the out side splice method in that situation, uglier but easier to do. WE have four gears here now that need repair.

Outside splice is interesting. In CAM18 was permmitted on landing gear and is mentioned in the paragraph on landing gear repairs.

In AC43.13-1B it is not mentioned in the landing gear paragraph, it only mentions the inside sleeve splice, fig 4-42, 44, 45 for streamline tubes but it does include inside and outside sleeves for rpund tubes.

But the figure for the outside streamline sleeve (4-43) says its good for struts and other members. Wouldn't you think landing gears would be an "other member"?

If I had an old AC43.13-1A to check I would check it to see how it read.

I think something got dropped when going from CAM18 to now. These airplanes could have been repaired under both so they can't contradict.

[Robert Lees]

Re: Replace a weld on landing gear strut?

THAT photo of your weld is unacceptable

I quite agree, go out and take a better photo next time.

[Guest]

Re: Replace a weld on landing gear strut?

I quite agree, go out and take a better photo next time.

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lol

[mhorowit]

Re: Replace a weld on landing gear strut?

I quite agree, go out and take a better photo next time.

I was itching to say that but I've accumulated too many point in smartassery lately so I bit my tounge - MikeH

[Forrest Barber]

Re: Replace a weld on landing gear strut?

Please do not hold back on my account. Nice catch, love all of you! The WELD is lousy!

[Guest]

Re: Is this the wrong splice?

Wait a second.
There is a section in 43.13 dedicated to landing gear repair (para 4-102). In that paragraph is a sub-section describing repairs to Streamlined Tube in which is stated "repair landing gears made of streamlined tubing by either one of the methods shown in Fig 4-42, Fig 4-44, or Fig 4-45.

The picture I attached shows an external splice similar to what is used in splicing ROUND tubing ( Figure 4-38).

Now, I'm too new at this to boldly announce that original splice was incorrect, but as I read the book I don't see provision for an external splice on a streamlined part of the landing gear.

Assuming I'm missing something, could someone talk to this apparent descrepancy? Thanks, MikeH

I looked in CAM 18 and it allowed outside sleeve splices so I contacted the FAA and here is teh response I got. Very nice helpful folks.

Mr Rude,

I have looked into your query regarding the repair of streamline tubing repair on landing gear. The specific issue you raised was using the type repair shown in figure 4-43 for landing gear. Figure 4-43 is not included in the paragraph that lists repair methods for landing gear, specifically paragraph 4-102(b). Furthermore, this repair method was allowed for in the Civil Aeronautics Manual 18, paragraph 18.6141 from which the AC was derived.

This does look to be an erroneous omission in the advisory circular and we will put in a change request to have it changed the next revision of the AC. However, until the AC is revised, you will not be able to use the AC as a basis for approved or accepted data in regards to this method of repair. Until then a field approval or some other method of approval will need to be obtained.

Marcus Cunningham
Aviation Safety Inspector
General Aviation and Avionics Branch, AFS-350
(202) 493-5228 Voice
(202) 267-5115 Fax

[mhorowit]

Re: Is this the wrong splice?

[QUOTE=drude;33163] Figure 4-43 is not included in the paragraph that lists repair methods for landing gear, specifically paragraph 4-102(b). Furthermore, this repair method was allowed for in the Civil Aeronautics Manual 18, paragraph 18.6141 from which the AC was derived.

Dave the work "Furthermore" is confusing me. shouldn't the word be "However" - Mike

[Guest]

Re: Is this the wrong splice?

[QUOTE=mhorowit;33182]

Figure 4-43 is not included in the paragraph that lists repair methods for landing gear, specifically paragraph 4-102(b). Furthermore, this repair method was allowed for in the Civil Aeronautics Manual 18, paragraph 18.6141 from which the AC was derived.

Dave the work "Furthermore" is confusing me. shouldn't the word be "However" - Mike

I might have chosed that word too. Bottom line they are fixing it. I guess we need a list of all the pending fixes for use perhaps in a feild approval.

Ironically I called an told them what to look for and what to expect to find so the word didn't bother me as much because they came to the expected conclusion. Usually you hear "furthermore" when someone has a conflicting opinion.

Dave