During leak testing on the wings, I installed the AN913-3D NPT plugs (square head) in the tank (see p 18-09 Fig 2) along with the other fittings etc.
After the leak test (ok) I tried to remove the AN913-3D plugs to add some thread sealer. One of the plugs came out easily, but the other one came out about a 1/4 turn and then started getting tighter. I tried taking it forward and back but the tightness just increased until I was afraid of breaking something. I'm not sure how to proceed, drill it out or what but it has really seized.
Wondering if anyone else has experienced anything like this and what cause or the solution might be....
After the leak test (ok) I tried to remove the AN913-3D plugs to add some thread sealer. One of the plugs came out easily, but the other one came out about a 1/4 turn and then started getting tighter. I tried taking it forward and back but the tightness just increased until I was afraid of breaking something. I'm not sure how to proceed, drill it out or what but it has really seized.
Wondering if anyone else has experienced anything like this and what cause or the solution might be....