PK Screws.

[Sulako]

It was removed because it was a personal attack. This isn't a Strega-bashing thread either, this is about PK screws.

[Troubleshot]

Yeah Sulako instead of playing god you may want to read the whole thread and discover that Strega came into this thread by stating that "The same reason most AMES and Pilots in Canada are paid shit,, because they are SHIT! I think theses are the same people that tried to put the square peg in the round hole..." So calling you, me and every other professional in this industry "Shit" is fine by you?? You have you mod. hat on inside out my friend.

But this post will probably get deleted because I called out a mod. and they have a hard time with that around here.

[wrenchturner]

Yeah Sulako instead of playing god you may want to read the whole thread and discover that Strega came into this thread by stating that "The same reason most AMES and Pilots in Canada are paid shit,, because they are SHIT! I think theses are the same people that tried to put the square peg in the round hole..." So calling you, me and every other professional in this industry "Shit" is fine by you?? You have you mod. hat on inside out my friend.

But this post will probably get deleted because I called out a mod. and they have a hard time with that around here.

I'm certainly not defending Strega here, but maybe you should take your own advise and read the whole thread Troubleshot. He didn't delete the post, but Sulako did give Strega shit for what he said.

[Troubleshot]

Yes I know...but he didn't remove Strega's post!!!!!!...yet he felt it necessary to remove a photo shopped picture of a boat sinking with "S.S. Strega" wrote on it.

You guys are missing point about personal attacks...If someone came up to me at work and called me a "shit AME" and then went on to tell me I get paid shit because of it....I would punch him square in the teeth, now if someone showed me a photo shopped picture with my name on it I'd probably laugh.

Please if I am missing something here I will remove my post and say I was wrong.

[HS-748 2A]

Actually, it was the Amoco Cadiz, but hey, they say renaming a ship is always bad luck.

[Bulawrench]

This is a valid thread to talk about and i also have the pleasure of
seeing a poor apprentice being shouted at because he installed
a PK screw in a nut plate for a # 10.
If the rest of the screws in the panel are #10s it is safe to say that one is too.
In general, Canadian AMEs are known to be highly skilled compared our friends to the south.
I have an x Russian friend that would disagree but that is another story.

[Sulako]

Yes I know...but he didn't remove Strega's post!!!!!!...yet he felt it necessary to remove a photo shopped picture of a boat sinking with "S.S. Strega" wrote on it.

You guys are missing point about personal attacks...If someone came up to me at work and called me a "shit AME" and then went on to tell me I get paid shit because of it....I would punch him square in the teeth, now if someone showed me a photo shopped picture with my name on it I'd probably laugh.

Please if I am missing something here I will remove my post and say I was wrong.

When I give someone a strike I usually leave their post intact so it can be referenced as the reason for the strike, unless the post really has to be removed (personal attack, racism, etc) in which case the strike is done via PM only.

[b1ngnx33]

I have seen multiple screws for one panel.

8, 10, and pk. It was only once but that was wierd.

8 and 10 combo's happen more frequently.

I just love multiple fairings that use multiple screw sizes, and the man who puts them ALL in one bag. GOOD move buddy.

Maybe getting those plastic baggies would have taken a whole 60 seconds longer to retrieve, but that would be

asking too much.

[iflyforpie]

The only time I ever had problems with #8 and #10 was when I was an apprentice. The #8s would go into a #10 and grab just enough to fool you, and the #10s would seem to act like any #8 where the floating nut wasn't perfectly aligned.

Once, I picked some screws out of stores and they would not go into the hole. No threads! I still have some those 'rivscrews' in my toolbox. That's QC for you.

Another thing I found as an apprentice is someone put a whole pile of floorboard screws (machine #10, but with a point at the end for alignment) into (and right through) a bunch of dome nuts on the pressure vessel. I'm sure the loss of pressurization wasn't catastrophic, but it must have taken some special effort (butterfly ratchet?) to get those screws to punch holes in those nuts!

[bombardierfixer]

I've blasted through dome nuts with a screw shooter, now if theres dome nuts, no screw shooter. I had never seen those pointed screws until I started working on the Boeing, of course I made my own in extreme circumstances ( last screw in a cargo pit panel, and a floating anchor nut ). We had guys using the wrong screws on the pressure bulkhead of the CRJ, and blasting through that. A SDR was made from us, I know the finger in the picture. 8's and 10's yeah they can cause new guys issues, I really don't see the point of 8's but thats just me.

[albertdesalvo]

Strega, you REALLY need to discover the benefits of screwing, and more importantly, proper screwing.

Priceless!

[MCRS]

Kiss my TCAS that was Awesome we all had a great laugh over that response.
Thanks for giving us our laugh for the day.
MCRS

[HS-748 2A]

I was had once, not long ago, by 10-24 machine screws.

I think they are AN515s or something like that.

I did not even know there was such a thing in AN stock and they otherwise looked just like AN 507s.

I was trying to put them into 10-32 anchor nuts and they almost started not too bad but would seize in there quite quickly, after about a turn.

They were all new anchor nuts and new screws, so for a while, I thought I had defective one-or-the-others on my hands.

I'm not likely to get bit by that again but I did have to learn it the hard way.

Also, I have run into 526s where the phillips recess looked ok but was probably only .032 deep.

Had a bag of 50 or so and I'd say at least 10 were like that.

They were from Avial but as they are only a distributer, who knows... Does make a person wonder how effective the QC is.

[iflyforpie]

National Course threads. 1/4 is 20 TPI (instead of 28) and 5/16 is 18 TPI (instead of 24).

You find them a lot on piston engines.

Still nothing like trying to figure out the British 'mirco' bolts on the Shorts and Islanders (you must get them on the 748 too). Don't even get me started on Whitworth...

[HS-748 2A]

On larger sizes like 1/4 and 5/16, I've never made the coarse/fine mistake.

It was the #10 that got me.

What are those used for? I've never seen them in propper application. These were countersunk.

I do deal with Whitworth thread, (and head sizes), near daily. It's funny though, like anything else, after a couple years of it you get an eye for them and you can spot one from a mile away - and know what wrench to use. I learned to quite like that part of the '48-Challenge'.

The British hardware has a very certain look to it too; very particular finish and markings and/or lack-there-of which twig you right away. Kind of that same way that metric hardware jumps right out at me in the bolt bin in my own garage. (I try to keep that stuff separated)

On the 748, the airframe is primarilly AN and the British stuff in mostly found on the engine, gear and hydraulics.

Suprisingly, the gearbox which is made by Dowty Rotol, is almost exclusivley SAE.

When you say 'micro-bolts', you probably mean #10 bolts with that really little head on them..?
Those are 2BA. That's about 0.043 smaller than 11/32" so you will get away with 11/32 six-point. I like how small those are. Good for lots of places where nothing else will do. They are 10-32 thread, which also makes them not too bad.

The biggest pain in the ass is when you've got to make a hydraulic line work. Different flair; different fittings, whole different ball of wax.. Oh - and designed to leak too.
Sometimes AN fittings somehow just get TIG'd on there in the middle of the night.

Oh - one other pain. Tiny screws the English use for terminal strips. They don't generally use studs and nuts. They use the equivelant of an 'aught' screw but with Whitworth thread on it.
Also, they are stainless, so you can not fish them out with a magnet when you loose one. You generally end up hunting around all over the airplane, robbing some relay for another one to get you home.

[iflyforpie]

These bolts were tinier. Used for cable fairleads and the like. I think it was like a 1/8 shank with a 7/32 head and 7/32 nuts (7/32 wrench didn't seem like a real good fit and I didn't have a socket that small).

Another thing I found out about British aircraft is how paranoid they are about flight control bolts. I am trying to remember... The bolts (on both the SC.7 and the BN2A) were odd step-bolts, so it was impossible for them to fall out one way (and don't loose them!). They spring snapped in place. The nuts were cotterpinned and then there was a metal clip that went over the nut and was lockwired. Not the ol' straight shank bolt into a castle nut with a pin that's on everything from a Beaver to Boeing.

[HS-748 2A]

Any place they do actually use studs for electrical terminals, the nuts for them seem to be 7/32 SAE. The threads though are Whitworth so god help you once again if you lose a nut. (Also, once again, stainless steel too)

I am not aware of other nuts similar to that size but actually Whitworth 'across the flats', as they say; but, that's not to say it doesn't happen.

The control surface bolt arrangement you're talking about sounds abit like the "Walker-Schofield" bearings on the 748's control surfaces. They are needlessly complicated. Often, control surface hinge bolts are locked with a reverse threaded bolt going through the hollow center of the main bolt. They will also be cotter pinned and / or tab-washered. They may also be stepped in certain applications. There will always be a pile of bushings and spacers.

One bolt always sets the 'center' for the control surface and the others float.

[KISS_MY_TCAS]

Priceless!

Kiss my TCAS that was Awesome we all had a great laugh over that response.
Thanks for giving us our laugh for the day.

[iflyforpie]

Priceless!

Kiss my TCAS that was Awesome we all had a great laugh over that response.
Thanks for giving us our laugh for the day.

Reminds me of your antics back in SAIT. Can't believe it's been ten years already!

C

[ALF]

I hate PK screws.

[ALF]

TCAS that is priceless. I am going to print it for future reference.

[2R]

I like to make a cardboard template in the approximate shape but miniature of the panel and then punch the screws through there.

Makes it damn near a pleasure to put them back in.

Not only are they the right type and size, they're the right length!!

Learned that from the old guys working heavy-checks on big iron.

Great idea ,thanks for sharing

[HS-748 2A]

Yeah, no prob. Put it to good use 2R.

It looks kind of cool too actually, when you have kind of an intricately shaped template, (like for the wing-to-body fairing on a 737), all full of colour-matched screws.

Also, as Strega points out, you can get the wood screws back in the right holes.



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