The Cessna 120-140 Association Forum

I have read the other posts for this job and getting ready for the last few steps. I am down to the strut and spar bolts.
One question that came up is the AN4 bolt on the flap torque tube and what happens internally with the springs and bell crank when tension is removed. At this point ,with help and proper force will the wing just slide outward and off ?
And what precautions if any for the tube and bell crank springs in the fuselage ?
Thanks.

The flap torque tube will get pulled back to the rearmost part of the cutout in the skin. Don't let it snap back.

If I recall correctly (last time was many years ago) you have enough side to side movement to work it out once both sides are unbolted.

Thanks for info. Sounds like even though I am only removing the right wing I need to remove the AN bolt from both the L and R flap rods that are sticking into the torque tube.

Just disconnect the springs from where they attach to the bulkhead so you don't have any tension on anything.

Thanks springs disconnected …easy peasy. Ready for bolt removal , replace with screw drivers then four guys hefting it out. Fingers crossed no glitches

Don't allow the wing strut to pivot down on the bolt at the gear box. There isn't enough clearance at the fuselage skin to allow it to reach the ground!

Don't forget to run strings through the wings to pull the control cables back in!

I’m about ready to put wing back on. All three strut attach bolts had washers on both ends ( except for nut side rear attach low profile nut). The IPC does not call for any washers here ? I’m thinking put back the same way , new hardware,
A&P helping says follow IPC …. I have read elsewhere that the IPC sometimes isn’t entirely correct
Thoughts……

I don't have a washer there. The trick is to make sure that the bolt grip fits to the 'forks' area and that you use the correct bolt and nut. Ham handed mechanics use bolts that are too long with a few washers under the head and then threads are bearing on the rearmost 'forks' area.

That bolt is nothing more than an AN bolt with the threaded area cut back.

Thanks for the picture. Yes. That is the rear strut attach bolt , do you remember if the forward strut ( with tie down ring) ,
and the bolt near the gear box had washers ? Thanks.

do you remember if the forward strut ( with tie down ring) , and the bolt near the gear box had washers ?

I know the parts book doesn't show washers, as you already noticed. That said, My IA says make sure the grip of the bolt is fully on bearing surface, he doesn't care about washers but don't get ridiculous. I think they're a good idea but that's just an opinion. I have washers FWIW.