Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 100; Flight Crew Total 1400; Flight Crew Type 750
Confusion; Distraction; Training / Qualification; Time Pressure; Situational Awareness; Other / Unknown
Ground Event / Encounter Loss Of Aircraft Control; Ground Event / Encounter Object
Aircraft Aircraft Damaged
Human Factors
Aircraft was being used for tailwheel instruction.  Taxi was being performed.  Upon turning on taxiway; brakes were applied in an attempt to maintain directional control; there was insufficient braking to maintain direction or stop the airplane.  This resulted in striking small sign with prop after engine was stopped.
Flight Instructor reported that during a student taxi lesson in a tail wheel aircraft; directional control was lost and the aircraft made contact with a taxiway sign.