Originally Posted by
Check Airman
What exactly is this section 41 that you speak of?
It's the cockpit area of Boeings since at least the 707. The equipment bay below has been called the 'lower 41' for over half a century.
One story of origin is that the compartment was numbered 41 on the original 707 drawings.
I was told years ago by a guy in a white hat that it started 41 inches behind the nose datum but that doesn't seem to be true for the other section numbers.