MS/NAS Gurus please come hither. 1

[uGlay]

Greetings fellow Eng-Tippers. Today I bring a query that regards hardware substitution in an aircraft manufactured by McDonnell-Douglas. (DC-9-50)

I need to find a bolt similar to HL11VAZ-6 but WITHOUT flush head and WITH either a hex or phillips slot. I know it's a long shot but maybe one of you has used something like this recently.

Background: We are installing antenna structure that utilizes 0.071" thick doubler on belly section of fuselage, around STA1050. Problem is that the Hi-Lok's collar is falling under the Longeron flanges and as a result we cannot tighten collars properly. We can fit a wrench alright, but it would be to install a simple nut such as MS21043 not a double-height HL collar.

Any help is greatly appreciated. I am also looking through SRM's substitutions section in hopes of finding something compatible. I attached a quick sketch of the section in order to give you guys a better visual of my problem.

Cheers,

uGLay.

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[Dan320]

KirbyWan;
Do download the paper I attached in a previous post. The PIC bolts are real handy sometimes. They are production parts on the MD-80 if my memory is right.

 

[KirbyWan]

Dan,

I looked at it. I'm going to keep it in mind the next time I run into that problem. This is a better solution then drilling a hole if you can get the fasteners in a reasonable amount of time. Thanks for the info.

-Kirby

Kirby Wilkerson

Remember, first define the problem, then solve it.

 

[WKTaylor]

uGlay...

You need a protruding or flush head screw?? You confused me right off the bat

There are plenty of flush-shear head, flush tension head and PH bolts with various recess designs!!!!

Any space to install nutplates or gang-channel NPs???

Regards, Wil Taylor