A BE2000 ON LNDG ROLLOUT HAD THE BRAKE ANTI-SKID AND PROP REVERSING SYS INOP CAUSED BY THE MAIN WHEEL TRANSDUCERS AND AN AIR-GND GEAR SQUAT SWITCH FAILURE.

Narrative

ON LNDG ROLLOUT; THE PF (COPLT) TRIED GROUND-FINE TO STOP THE AIRPLANE AND ALSO THE WHEEL BRAKES. AT 2000 FT DOWN A 4000 FT RWY; I MENTIONED THAT WE WERE RUNNING OUT OF RWY; AT WHICH POINT HE STATED THAT HE DIDN'T HAVE GND FIRE OR WHEEL BRAKES. I APPLIED BRAKES AND THEY WERE NOT RESPONDING. NEXT I TRIED FOR 'REVERSE' WITH THE PWR LEVERS AND THERE WAS NO CHANGE IN DECELERATION. THE NEXT ACTION WAS TO SHUT OFF THE 'ANTI-SKID' WHICH GAVE US PWR BRAKES AND THE ACFT CAME TO A COMPLETE STOP AT THE VERY END OF THE RWY. NO ACFT DAMAGE AND NO CREW OR PAX INJURIES. THE WHEEL SPD TRANSDUCERS WERE FOUND TO NOT HAVE THE PROPER VOLTAGE AND THEY WERE SENSING A 'SKID' WHICH RELEASED THE WHEEL BRAKES. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ANTI-SKID PROB WAS CAUSED BY FAILURE OF THE MAIN WHEEL TRANSDUCERS AND THE FAILURE OF THE PROP REVERSERS WAS THE FAILURE OF THE AIR-GND SQUAT SWITCH WHICH SENSED THE ACFT STILL IN THE AIR. THE RPTR SAID THE ACFT HAD NO PREVIOUS HISTORY OF BRAKE OR REVERSING PROBS.