Learjet 40
Air Traffic Control Fully Certified
Situational Awareness
Deviation - Altitude Overshoot; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter CFTT / CFIT
General None Reported / Taken
Human Factors
I was vectoring a LR40 to a south downwind; I instructed him to descend and maintain 2;500. I had other things going on and I looked up and saw that he had descended to 1;500 just south of the localizer.
PBI Controller described an unauthorized descent below assigned altitudes resulting in a MVA infraction.