Hi Art,

The cause of the main landing gear not coming up --99% of the time-- is that the door is not open far enough to clear the brake pad bolts. And the door is flexible enough to bend outwardly until the tip of the door will touch the brake pad bolts. You can see if this is the case by looking for nicks in the door composite material at the very tip of the door. If the material is chipped--look no further. But if it's inconclusive I would suggest putting a layer of duct tape or wide masking tape around the edge of that door and flying the airplane. If the gear does not come up it should leave an indelible impression in the tape so that you know exactly where it is hitting.

You can also test on the ground by doing a retraction test and bringing the gear up to the point where it is about 2 feet out of the well. At that point--by hand with the pump off-- push the gear door outward-- as hard as you can-- and retracting (pushing) the gear up to see if it will hang up on the bolts mentioned. If it does then you would not need to fly it.

The cure;

Number 1- stiffen the door. More carbon in the slider strip mount. Check the service bulletin on the subject. Aluminum tube bedded in carbon works well. Just make sure there's no interference with the gear up.

Number 2 -- open the door further by increasing the height of the poly slider strip. This may cause a problem by the two doors hitting and the trap door interfering with the other gear door.

#3 -- if you have Clearence between the tire and the outer fuselage skin as the wheel goes into the wheel well, you can put a spacer shim under the axle to move the tire outboard. This is the least likely option, because the tire will arc out beyond the edge of the fuselage. But it would be my first choice IF there is room.

Send some pictures and I'll help you further if you like.

Charlie K.