Look Back/Shoot Back
There are two serious problems that plague most starfighters: a "blind spot" in the hind quarters of the ship, coupled with an inability to shoot anything in said spot.
Look Back
Active Starship Sensor Systems use a series of pulses from an "emitter" to detect objects, such as other spaceships. These work by emitting a pulse, bounding it off of something, and reading the returned signal. This is not much of an issue for large, slow-moving craft, but causes a serious issue with starfighters.
Often fast and highly maneuverable, these ships have a tendency to "outrun" the return-signal. This is not much of a problem for forward and lateral arrays, but namely manifests itself on the ships aft-quarters, leading to a sort of sensor blind-spot. This is, of course