Convair B-36

Front upper turrets and left hand gunner's blister. Notice how the door opened by sliding down a track,
one door on each side. The rear upper and lower doors worked differently, with one door for each turret pair.
The upper door came down the left side, and the lower door moved up the right side. These doors opened any time the bomb bay was open.
I would assume they would also open independently of the bomb bay, but I am not sure.

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