how to calculate g-force?

a 35,000 kg plane travelling 120 m/s turns in a full circle, the period being 12 s. if the plane maintains constant altitude and velocity, what is the g-force on the pilot?

the number of g's on the pilot in the radial direction is (v2/r)/g.
 
v = 120 m/s
 
t = 12 s
 
g = 9.8 m/s2
 
2πr/t = v ⇒
 
r = vt/(2π)
 
plug in v and t, and get r.  then plug v, r, and g into (v2/r)/g to get the number of g's in the radial direction.