on the beam

on the beam  {adv.} or  {adj. phr.}

1. (Of an airplane) In the radio beam that marks the path to follow between airports; flying in the right direction.

A radio signal tells the pilot of an airplane when he is flying on the beam.

2.  {slang}

Doing well; just right; good or correct.

Kenneth's answer was right on the beam.

Contrast: OFF THE BEAM.