C172 safety: Screws under the wing above the doors

On Mar 11, 2:44 am, wrote:
They are where the wing and fuselage meet. What you said makes sense.
Those screws looked large compared with those on the household
appliances, but they are not that big. Google'd a bit and found
Sporty's
offering bags of exterior screws and washers, explicitly stating there
are
not interior structural parts.

Do these things fall off often ? like the fasteners in passenger
compartment
in cars.

But what can cause these screws to become loose one by one, over the
period of 3 months ? But no screws from under the other wing ? I
suspect
the AP in the last 100 hours didn't screw them in, if these needed to
be unfastened.

I called our AP and couldn't reach him. Will call again.

Thanks for the response.

P S

On Mar 10, 8:32 pm, "BT" wrote:

sounds like screws that cover the trim piece where the wing and fuselage
meet.

The "Bolts" you seek are rather large.. not screws.. that hold the wing..
and should be found behind the trim piece..

but when in doubt.. ask your mechanic to show things to you.

B

wrote in message

oups.com...

Our 172 has two screws missing from under the wing where
it connects to the fuselage above passenger door.

The size of those screws are quite big. My question is whether
they are important to the stuctural integrity of the wing ? They
may have come off during flight due to the vibrations. But it
is still some hours before the next 100 hours.

Are those screws important for holding the wing to the fuselage ?
or are they only there to cover the holes, and there are some
other bigger screws/nuts inside the wing that are doing the real
work ?

A speedy reply will be appreciated.

P S


Those screw are likely #8 sheet metal screw with countersunk washers
used to hold the wing root trim panel on. You should check exterior
screws on access panels every couple of flight. The vibration wil
cause them to back out.