M-7 LANDED WITH PARKING BRAKE SET; AND ACFT NOSED OVER AFTER TOUCHDOWN. PROP MADE CONTACT WITH RUNWAY.

Narrative

ACFT NOSED OVER ON LNDG; CAUSING PROP; NOSE CONE; AND LOWER COWLING TO COME IN CONTACT WITH THE RWY. WX VMC; WIND CALM. PARKING BRAKE APPEARED TO BE ENGAGED ON LNDG; CAUSING THE EVENT. ACFT HAS; IN PREVIOUS EVENTS THAT CAUSED NO DAMAGE; APPEARED TO HAVE 1 BRAKE SET DURING FLT; CAUSING A TURN TOWARD THE SIDE OF THE RWY UPON LNDG. I HAVE ALWAYS BEEN ABLE TO DISENGAGE THE BRAKE PRIOR TO DEPARTING THE RWY. I HAVE INCORPORATED INTO MY PRE-LNDG CHKS TO PUMP THE BRAKES (TO DISENGAGE THE PARKING BRAKE; IF IT HAS BEEN ENGAGED IN FLT). CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: REPORTER OWNS THE ACFT AND STATED THAT IT HAD EXHIBITED UNEVEN BRAKING IN THE PAST. BRAKES WOULD BOTH REACT EQUALLY AFTER MODERATE BRAKE APPLICATION; SO THE PROBLEM WAS IGNORED. IN THIS INSTANCE; HOWEVER; THE ACFT IMMEDIATELY VEERED OFF THE RWY. REPORTER BELIEVES THAT A TAB; WHICH LOCKS ROD INTO POSITION TO SET PARKING BRAKE; MAY HAVE BEEN DRAGGING. THIS COULD CAUSE THE BRAKE TO BE PARTIALLY SET. REPORTER HAS SINCE DEACTIVATED PARKING BRAKE.