[AdamN]

The point s_dev is trying to make is that the designer can (and should) design things so that the mechanic "doesn't have to think". Seems like Airbus has evolved their design accordingly.

[GerryB]

The solution is actually quite elegant: a long tagged key required to open the door which remains in the lock until it's closed again. https://safetyfirst.airbus.com/preventing-fan-cowl-door-loss...