Looking for alternative to NAS1056

[KirbyWan]

Howdy all,

I'm having trouble locating NAS1056K5 spacer, sleeve-rivet. Is there an alternative P/N under a different spec (MS or AN, or just a producers P/N that conforms to the spec etc.) that may be available? With the inability to find these on the market we may be reduced to machining them from bar stock, but that would be cost prohibative.

Thanks,

-Kirby

Kirby Wilkerson

Remember, first define the problem, then solve it.

 

[WKTaylor]

KirbyWan...

Checked NAS1056K* [Inconel X alloy] for National Stock Numbers [NSNs]... found 3 listed in -6 & -12 diameters, only... listed in IHS standards expert.

Checked NAS1056E5* [A286 alloy] for National Stock Numbers [NSNs]... found (7) -5 Dias listed in IHS standards expert.

Checked NAS1056C5* [30x Annealed alloys] for National Stock Numbers [NSNs]... found (8) -5 Dias listed in IHS standards expert.

"K" code Inconel X is an extremely high temp alloy. Even though the spec allows it, stock will likely be non-existant anywhere.

Some of the A286 parts listed were fairly long... and might be "chopped-down" to work... assuming the 1000F--1100F limit is OK.. otherwise You have no option but to "local fab same as per NAS1056".

Regards, Wil Taylor

 

[KirbyWan]

Thanks Wil,

This is for application of SB 78-242 on CF6-50 long fixed core exhaust nozzles. I took me a bit of digging but I think the problem is that we should be installing SB 78-244 which doesn't require them. Another problem I figured out was that the SB that calls for them askes for a length of -020 which according to the spec should be .2" long. But the SB obviously wants spacers that are .02" long which is basicly a washer. The only reason for the washer (I'm assuming here) is so that only one rivet length is needed since the newer SB does not require them in the same location. I think the SB was not well designed. I would have skipped all the fasteners (on the order of 700) and done a braze repair, but because this is now an AD I don't have any choice in the matter.

-Kirby

Kirby Wilkerson

Remember, first define the problem, then solve it.