Unlike the BTL-S3 Y-wing and its successor designs, the BTL-B model had a full covering of both the primary fuselage and engines. A bubble-turret provided clear view for the gunner, with a 360-degree field of fire.
The BTL-B was designed as a bomber, using such weapons as proton bombs. The bubble-turret utilized two light ion cannons for defense against enemy starfighters. It also was equipped with two medium laser cannons mounted on the front of the starfighter.
They possessed a hyperdrive system allowing them to jump into hyperspace without the reliance on a carrier or hyperspace ring. To aid them in their operations, they also made use of an astromech droid.
The BTL-B Y-wing was acquired from a Koensayr testing facility in orbit around Bormus.
After receiving the fighters, Anakin Skywalker formed Shadow Squadron of the Republic's most skilled Clone trooper pilots, and began using the ships immediately to hunt General Grievous's flagship Malevolence, the secret weapon of the Confederacy of Independent Systems.
Koensayr testing facilities could barely keep up for the demand on the fighter, and in addition to the ships that were acquired by Skywalker, two squadrons of BTL-B's were issued to Hunter Squadron, who participated in the Battle of Gwori, led by Jedi Generals Plo Koon and Saesee Tiin.
One Y-wing, painted light green, was used by both R2-D2 and C-3PO to escape Adi Gallia's doomed flagship when General Grievous ambushed her fleet.
BTL-Bs were subsequently issued to Blue and Red, and were repainted with their respective squadron's colors. Gold Squadron were also issued Y-wings.