PapaUniform
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- Jan 30, 2017
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Hi all,
I know this has been discussed in detail before, but through all my research I am still struggling with one part of the increase in GW from 1100 to 1170. I have a 1940 J3C-65. All four lift struts have been upgraded to the Univair sealed struts and heavy duty forks. The only question remaining is, what exactly needs to be done to the LG/strut attach fitting to be eligible for the 1170 gross weight? I know it has to be "revised in accordance with Piper drawing 21642," but I'm having a difficult time interpreting this drawing and deciphering what it means.
1.) For the lift strut attach points, it appears that the existing holes need to be reamed and bushings 80012-63 installed? I see that this bushing is sold by Univair, so...
2.) What needs to be done with parts 80012-64 and 81342-14 on the landing gear attach portion? I can't find these part numbers on Univair or anywhere else I've tried??
3.) What is the significance of the numbers "20121 LH" and "20121-01 RH"? Does anything need to be done here, or is it just a part number reference?
4.) Finally, the kicker - can all of this be done while the bracket is installed on the airframe?
I know the next jump to the 1220 lb GW involves additional mods to the landing gear brackets, legs, and cabane, which I am not going to consider right now. While it would be great to have, I'm not interested in tearing into my fully flyable Cub at this point.
Thanks for any help! I feel like I'm reading another language when I'm looking at these drawings..
I know this has been discussed in detail before, but through all my research I am still struggling with one part of the increase in GW from 1100 to 1170. I have a 1940 J3C-65. All four lift struts have been upgraded to the Univair sealed struts and heavy duty forks. The only question remaining is, what exactly needs to be done to the LG/strut attach fitting to be eligible for the 1170 gross weight? I know it has to be "revised in accordance with Piper drawing 21642," but I'm having a difficult time interpreting this drawing and deciphering what it means.
1.) For the lift strut attach points, it appears that the existing holes need to be reamed and bushings 80012-63 installed? I see that this bushing is sold by Univair, so...
2.) What needs to be done with parts 80012-64 and 81342-14 on the landing gear attach portion? I can't find these part numbers on Univair or anywhere else I've tried??
3.) What is the significance of the numbers "20121 LH" and "20121-01 RH"? Does anything need to be done here, or is it just a part number reference?
4.) Finally, the kicker - can all of this be done while the bracket is installed on the airframe?
I know the next jump to the 1220 lb GW involves additional mods to the landing gear brackets, legs, and cabane, which I am not going to consider right now. While it would be great to have, I'm not interested in tearing into my fully flyable Cub at this point.
Thanks for any help! I feel like I'm reading another language when I'm looking at these drawings..
