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Post by Flocker on Sept 19, 2017 2:37:09 GMT
Learned something new today during my 300 hour inspection. There are 2 different types of screws used on the wing inspection plates. Some are standard and some are metric. (and one is even counter sunk) Make sure you replace them in the same holes they came from otherwise they could strip the threads. The darker colored screws go into the pre-threaded "backed" holes. The lighter colored screws go directly into the sheet metal. The threads are different. This was on a P2008.
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Post by geobuff on Sept 21, 2017 11:51:22 GMT
Ha, you too. Have found that to be true on my Astore also. The problem is the 'professionals' doing annuals and inspection did not understand this and all screws went into a pot and were randomly replaced. Most everyone used power-tools to replace screws so they never notice. Of course all this is Tecnam's fault for not using standard uniform screws. I don't care if they use metric or english, but PLEASE Tecnam, one of the other. I now demand the repairman do NOT use power tools to replace screws, as when you replace a screw with a manual screwdriver, you can tell if it is getting tight and is the incorrect screw. I don't mind if they use power tools for removal however.
For those who do not have this problem, a Metric 6.7 visibly looks identical to a english 6:32, but when you try and match threads, they do not match identically. When you screw it in, it gets very tight and eventually strips. Usually the screw thread will strip before the receptacle (which is preferable), but the opposite can happen and has happened to me. I have both screws in my extra parts bin, so I always can replace any screw which gets worn or damaged (usually the head) with the 'correct' threads.
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Post by buzz on Sept 21, 2017 17:55:36 GMT
I have heard a similar complaint of mixing metric and standard on a 2006. I don't get the logic behind doing this....baffling.
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Post by cole505 on Jul 13, 2018 4:56:56 GMT
TECNAM HARDWARE
Welcome to the world of Tecnam........ each panel that comes off my 2008 gets it very own screw bag 💼 we did the same procedure in the Air Force ( F-16”s ) and works very well, but occasionaly the screws still get mixed up? Still not sure how it happens but it does! This works the best and make sure you keep both types screws handy you will need them!
Ray & Lucy ✈️😊😎👍🏻✅🐾🇺🇸
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TiPi
New Member
Posts: 28 
Home Airport: YATN
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Post by TiPi on Jul 13, 2018 22:46:11 GMT
I went one step further and upgraded all hardware for the access panels to SS, now I only have button head and countersunk screws. The direct-drilled ones were replaced with aluminium M4 rivnuts, the same for the holes with the sheet metal clips. The original screws started to rust after a few years and became unsightly. All button head screws are the large dia head ("built-in" washer) with 2.5mm Allan key. With a small battery screw driver, they are all off in a couple of minutes.
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Post by Flocker on Mar 20, 2019 13:16:43 GMT
There are 2 different types of screws used on the wing inspection plates. Some are standard and some are metric. (and one is even counter sunk) Make sure you replace them in the same holes they came from otherwise they could strip the threads. The darker colored screws go into the pre-threaded "backed" holes. The lighter colored screws go directly into the sheet metal. The threads are different. This was on a P2008. Seems like a good time to resurrect this post as I plan to take my P2008 to a new A & P for my annual next month. Don't forget to let new mechanics know about this. |
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Post by Ed Midgley on Mar 20, 2019 22:13:33 GMT
Our planes come with mm4x.75
In the US I’ve only found mm4x.70
You can run a .70 tap into the .75 hole which I’ve done with good results.
You can get stainless .70 anywhere even ACE Aircraft Supply (hardware store)
Ed
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Post by Glenn on Mar 21, 2019 0:21:02 GMT
Ed, sadly you seem to be correct. I find it extemely confusing and odd that I can buy a m4x0.75 tap but I can't find those screws anywhere.
Don't understand all that. I'm sure there MUST be a good reason but...
Glenn
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Post by Ed Midgley on Mar 21, 2019 0:55:19 GMT
The threads are so close that running the .70 tap through is quite easy. I’ve converted more than half my plane to .70 with stainless screws.
It is crazy that the taps are available but the screws aren’t.
Ed
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Post by Glenn on Apr 30, 2019 17:16:29 GMT
I had to remove my nose wheel pant recently. I remembered this discussion about screws so I compared those screws to the wing inspection plate screws. As others have reported, I found they are different threads. I called Josh in Sebring for a short conversation about screws. Turns out, at least on my plane, the nut plate screws are 8-32 and the inspection panel screws in the wings are m4-0.70x14 (rivnuts).
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