Countersink Fillers

[Sparweb]

Has anybody encountered the little conical fillers that can be used in repair work to fill the countersink when one applies a doubler over top? I've been shown these before by a repair shop, but I can't find my notes where I wrote the part number to call out. It was a Boeing p/n, as I recall.

Steven Fahey, CET
"Simplicate, and add more lightness" - Bill Stout

 

[jetmaker]

SparWeb,

I believe you are refering to repair washers, Boeing p/n 66-02955.


jetmaker

 

[Sparweb]

The part number isn't quite what I remember. There was a specific p/n for different head size/shank size combinations.

I'll try a sketch to illustrate what I mean:

_______ _________
_______| |_________ New layer
_______\ /_________ Filler in this layer's c-skink
_______| |_________ Existing layer


Steven Fahey, CET
"Simplicate, and add more lightness" - Bill Stout

 

[rerig]

While this isn't a specific p/n.
OEM engineering had us shoot a csk AD rivet in the discrepant hole, then re-drill, creating our very own repair filler. This worked with Doubler only.

This from my "Structural Repair Memory"
I didn't substantiate it because it came from OEM with an 8110-3.

Cheers.

 

[Sparweb]

That's actually how I started looking this up. I was discussing with the technician how we would install a particular doubler, and his suggestion was that when he drilled out the existing rivets, he would keep the heads and re-insert them. My response was that he should use the parts made for that purpose, as drilled-out heads will have burrs all over them. But I couldn't find my notes to tell him what to use.

By the time I got back, he'd already done it according to his own plan. Sigh. When you're called in as a consultant, the shop floor guys don't feel as motivated to do exactly as you say...



Steven Fahey, CET
"Simplicate, and add more lightness" - Bill Stout

 

[rerig]

Trust me....when you are a company Liasion Engineer they don't listen either.
But, Inspection ALMOST ALWAYS wants to see the substantiation for the repair. Bless their Hearts.

I'm thinking about having "I told you so" stickers printed and just hand them out. (But that would be a display of "Bad Attitude" and we wouldn't want that!)

Who is that comedian that hands out "Stupid" signs?

Sorry, I digress.
I'll try to find this in the SRM...I just can't remember exactly where in CH 51 it is. (Used to know...getting Old)

Rerig

 

[737eng]

BAC SRM's have countersink filler info in Ch 51-40-08. Same section that contains general countersink data. The section provides mat'l info and also provides what rivet it can be made from. It is common practice to make a countersink filler from a rivet. Don't know if that helps or not.

 

[jetmaker]

SparWeb,

The p/n I provide is the Boeing part number. A dash number follows specifying what the appropriate dimensions should be.

For example, 66-02955-51 is a repair washer for a 100 deg tension head 3/16" Hi-Lok. A -52 is for the same fastener, but 1/4" diameter.

Hope this is useful.

jetmaker

 

[Sparweb]

jetmaker,

How about the dash number for a 1/8" rivet with a reduced countersunk head? This is a case where a NAS1097AD4 was drilled through.



Steven Fahey, CET
"Simplicate, and add more lightness" - Bill Stout

 

[jetmaker]

SparWeb,

Sorry, but from my sources, there is no Boeing part number repair washer available for such a small csk depth. I do have one for a 1/8" MS20426D rivet (-1) or a 5/32" CE rivet (-47). The csk depths on these repair washers is 0.048" and 0.035" respectively.

Wish there was more I could do. If you find another p/n, let me know.

jetmaker