The TBD Devastator marked a large number of "firsts" for the U.S. Navy. It was the first widely-used carrier-based monoplane as well as the first all-metal naval aircraft, the first with a totally enclosed cockpit, the first with hydraulically folding wings; it is fair to say that the TBD was revolutionary. A semi-retractable undercarriage was fitted, with the wheels designed to protrude 10 in (250 mm) below the wings to permit a "wheels-up" landing with only minimal damage.

A crew of three was normally carried beneath a large "greenhouse" canopy almost half the length of the aircraft. The pilot sat up front; a rear gunner/radio operator took the rearmost seat, while the bombardier occupied the middle seat. During a bombing run, the bombardier lay prone, sliding into position under the pilot to sight through a window in the bottom of the fuselage, using the Norden Bombsight. The offensive armament that he targeted would be either a single Bliss-Leavitt Mark 13 aerial torpedo or a single 1,000 lb (454 kg) bomb. Defensive armament consisted of either a .30 caliber or .50 caliber (12.7 mm) machine gun firing forwards, and a .30 caliber machine gun for the rear gunner.