Carb heat box repair
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Carb heat box repair
My carb heat box will occassionally require a little tweaking about every 6 months or so. I'll pull the knob out and it will be stuck in the off position. I'll twiddle with it and it will then behave properly. Of course, it always works perfectly during my preflight!
Took another look at it today and I think the problem is the holes in the side walls of the box are wearing and the axel will drop down in this notch and hang up.
My question is will the rebuild kits offered by Spruce or Wag Aero do the job or just replace the box entirely. Also are these kits and boxes FAA approved? They seem awfully cheap for an aircraft part, $177 for the box. If not approved, is there another source for approved versions other then Mother Cessna?
Thanks for the advise.
Took another look at it today and I think the problem is the holes in the side walls of the box are wearing and the axel will drop down in this notch and hang up.
My question is will the rebuild kits offered by Spruce or Wag Aero do the job or just replace the box entirely. Also are these kits and boxes FAA approved? They seem awfully cheap for an aircraft part, $177 for the box. If not approved, is there another source for approved versions other then Mother Cessna?
Thanks for the advise.
The repair kits are a good, inexpensive way to get more mileage out of an otherwise sound airbox. The kits are not FAA PMA'd (approved) but so what? You are merely participating in "owner produced" parts by making a "final acceptance inspection" and rebuilding your airbox, which is then a proper repair.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
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I found I had the same problem during the annual, I went for the avglas kit. McFarlane owns the STC, the number is se00164se. The kit is nice but will require some brazing and riveting and a 337 when your done. All said and done it took less than a day (my buddy insisted on repainting the whole airbox). If you would like I have the stc, instructions and 337 for you to see to determine if this is the route you want to go.
Vic
Vic
Vic
N2609V
48 Ragwing
A Lanber 2097 12 gauge O/U Sporting
A happy go lucky Ruger Red label 20 ga
12N Aeroflex
Andover NJ
http://www.sandhillaviation.com
" Air is free untill you have to move it" BB.
N2609V
48 Ragwing
A Lanber 2097 12 gauge O/U Sporting
A happy go lucky Ruger Red label 20 ga
12N Aeroflex
Andover NJ
http://www.sandhillaviation.com
" Air is free untill you have to move it" BB.
According to the rule, FAR 21.303, the owner must "participate in the design, manufacture, or quality of the part." According to both my FSDO inspector and a local aeronautical engineer (TIC170A member), "final acceptance/conformity inspection" is a manufacturing procedure.russfarris wrote:So, does this apply to the new air box assembly? Since it's not a PMA approved part, doesn't it need a field approval? Russ Farris
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
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The Spruce catalog sez "Cessna 170 style heat box" and then it sez "heat box Cessna 170". Even if these are not FAA/PMA'd, and it's pretty vague whether they are or not, if you perform a "final acceptance/comformity inspection" the installation will be an approved one,by George (get it? )
At least that's what I get from George's post. Or does the "inspection" participation by the owner only apply to repair of an old beat-up part?
Eric
At least that's what I get from George's post. Or does the "inspection" participation by the owner only apply to repair of an old beat-up part?
Eric
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The earlier message I posted refers to FAR 21.303, "owner procuced parts". It doesn't say anything about owner "repaired" parts.
In any case, an A&P must install the parts or supervise their installation and sign it off.
In any case, an A&P must install the parts or supervise their installation and sign it off.
'53 B-model N146YS SN:25713
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
50th Anniversary of Flight Model. Winner-Best Original 170B, 100th Anniversary of Flight Convention.
An originality nut (mostly) for the right reasons.
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- Joe Moilanen
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- Joe Moilanen
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Jr.cubbuilder
The last one I did was the avglas repair. The flapper valve was brazed onto the shaft. Being as thin as it was I pretty well destroyed it getting it off the shaft by trying to heat it enough to loosen the brazing. I think it would be a good idea to plan on replacing the flapper as well. Once it was off I drilled off the bearings and pulled the shaft and the arm side bearing came with it.
The last one I did was the avglas repair. The flapper valve was brazed onto the shaft. Being as thin as it was I pretty well destroyed it getting it off the shaft by trying to heat it enough to loosen the brazing. I think it would be a good idea to plan on replacing the flapper as well. Once it was off I drilled off the bearings and pulled the shaft and the arm side bearing came with it.
52 170B s/n 20446
56 172 s/n 28162
Echo Weed eater, Jezebeel
56 172 s/n 28162
Echo Weed eater, Jezebeel