Author Topic: Wingtip screws  (Read 452 times)

yukonranger

Wingtip screws
« on: January 18, 2021, 06:40:39 PM »
Hello  I have a 1400 series H295.  My wingtips have always been held on by Type A sheet metal screws into tinnerman clip nuts.   This is the wrong type of screw for tinnerman nuts (should be Type B).  The parts manual specifies AN 526 8-32 screws which is a non-structural machine screw.  The parts manual does not specify what the female fastener is (probably some type of clip nut).

What is the screw and nut used on late H295s from the factory?

Also, what is the female fastener for the fairing strips between the fusilage and the wing?

Thanks

Mike
295H

Barry Dechert

Re: Wingtip screws
« Reply #1 on: January 19, 2021, 07:39:05 PM »
There are suppose to be nut plates. 8-32 the original nutplate on earlier Helios, were changed over to another style nutplate due to some nut plates wearing in to the wing rib.
I believe there is a service letter addressing the issue. See if I have time to find it. The service letter has the part number of the newer style nutplate. See if I can find that for you.

Barry Dechert

Re: Wingtip screws
« Reply #2 on: January 21, 2021, 11:26:35 AM »
 NAS1031D08, nut plate.

yukonranger

Re: Wingtip screws
« Reply #3 on: January 21, 2021, 12:57:00 PM »
Thanks!  Oddly, my wing has never been drilled for these (or any) nutplates.

Barry Dechert

Re: Wingtip screws
« Reply #4 on: January 21, 2021, 05:00:55 PM »
I looked through all the parts manuals none of the books showed a part # for any type of fastener receptacle. My service notes only up to #31. Documentation I cannot find. My 1958 H391B has those type nut plates. As I was informed by a reliable source these were correct. I wish I had found something on paper. Barry.

jmetzler

Re: Wingtip screws
« Reply #5 on: January 21, 2021, 05:02:32 PM »
There is an engineering order that says "to reduce cost by replacing present nutplates with push-on tinnerman nuts." Sn 1222 and on came with tinnermans according to the EO.

jmetzler

Re: Wingtip screws
« Reply #6 on: January 21, 2021, 05:03:49 PM »
Sorry, part number for the tinnerman is A1804-8Z-1.

Kevin Dunn

Re: Wingtip screws
« Reply #7 on: January 21, 2021, 07:07:47 PM »
That would explain why 1233 has Tinnermans.

Thanks Jim.

Kevin

Barry Dechert

Re: Wingtip screws
« Reply #8 on: January 22, 2021, 01:50:31 PM »
Thank You Jim.

yukonranger

Re: Wingtip screws
« Reply #9 on: January 24, 2021, 06:49:59 PM »
Thanks Jim!