nutplate help

[napkineng]

looking for:

1/4 nutplate, floating (as per MS21059) BUT with a 0.875 rivet spacing. want to do a one to one replacement for ketema V4-109.
any leads would be greatly appreciated, trying to avoid having to add a nutplate strip
thanks
cal

 

[bf109g]

A quick look at the Ketema website shows that this is an MS17731-21 quarter turn receptacle, not a nutplate.

 

[napkineng]

sir, that is correct, we are doing an STC project which requires the removal of the ketema fastner, replace with a 1/4 anchor nut. we are trying to source a nutplate with the 0.875 rivet spacing
cal

 

[SAITAETGrad]

Use an NAS1068 style and rotate 45 degrees...drill some new holes.

 

[napkineng]

SAIT,no can do, will "run out" of ED on the flange edge. already tried that one.
cal

 

[bf109g]

Have to admit I'm stumped. Full size nutplates are 1" spacing and the minis are .56". Any chance you could flush rivet a standard nutplate to a piece of sheet made from the same material as the flange and then use the existing holes in the flange to attach your new assembly? I've used that philosophy to create my own nut strips.

 

[napkineng]

109, thats exactly what we did, worked great. was just trying to reduce the "in field" workload for a metal tech doing the stc kit install. a one to one replacement would have been very easy, not that your described technique is difficult, just more time consuming
frustrating that bell did not use standard 1.00" spacing ketema fastners, as they do exist.
cal

 

[thruthefence]

If you are removing a camloc and trying to install a nutplate, I think the camlock guys did this on purpose, the spacing I mean. At least this is what I was told, many years ago. They didn't want their specialty fasteners swapped out to nutplates as an expedient.

(strictly anecdotal)

might be a business opportunity here tho.

 

[napkineng]

actually the frustrating part is ketema has an V4-109 that DOES have 1.00 spacing, for some reason bell used the narrow 0.875 spaced fastner.
my guess it was "in the parts bin"

 

[hydtools]

Can you use rivet-less nutplate?

http://www.cherryaerospace.com/files/pdf/catalog/CA-1030.pdf

Ted

 

[bf109g]

I beleive that the Ketema stud assembly has a sleeve that gets pressed into the part. Not too confident about a rivetless nutplate installing in that sleeve.

Removing the sleeve would leave you with a hole larger than .25", so we're hosed there, too.

 

[napkineng]

hydtools/109: good idea,BUT, this stc is intended for field applications, so we want to use commom "bench stock" and tools. hence the good ole MS21059's

also the hole in the T is 1/4 for the ketema, dont want to get any larger (ED). also, if you get a "spinner" in the field after intial install, then you really have a problem

 

[der8110]

Following the rivetless nutplate line of thought, how about Click Bond nutplates?

http://www.clickbond.com

Very field-friendly, through hole not critical (but needed for clamping), and there are varieties with replacable threaded elements. Redundant countersink would need filling, though.

 

[napkineng]

not to happy with clickbond on metal. also when i say field friendly, think jungle / desert and installing/removing panels. if you trash a clickbond, no time to wait around for adhesive etc.
spoke at length with our DER and other "metal men", looks like its a strip and double flush the existing ketema receptacle holes. hard to beat a solid AD rivet for longevity
thanks
cal

 

[Sparweb]

"ketema".... "V4-109"... "bell"... I've heard this before...

Are you talking about the transmission wall access panel fasteners in a Bell Medium Heli?

If anyone has found alternatives, it might be Global Helitech in Surrey, BC Canada. They process-repair those kinds of panels. Then again - repairs are in principle a restoration as closely as possible to the original configuration.

I hope this link will work...

http://www.tc.gc.ca/aviation/applic..._start=2008-01-15+00:00:00&proj_num=P-08-0013

Of course, once they get wind you're working on your own STC, their competitive spirit may be aroused!


Steven Fahey, CET

 

[napkineng]

thanks steve, actually we are talking the forward lower belly panel, fwd of station 23.
will check with the boys at helitech, we go back a ways, no worries there.
cal