I changed this post after I read the website of the company that sends the bills. Apparently it’s totally automated which guarantees a certain error...
Thank you everyone. Pretty clear now. I got the mechanic to do a 337. Turns out in the case of the flap rollers, the STC applies to the one “special...
The door on my hangar is a manual door with counterweight tied via cable from the counterweight box at the back of the hangar through two pulleys to...