ACFT EQUIP PROB CREATES CTL PROB FOR SMA PLT.

Narrative

I WAS FLYING AN SMA ON A ROUTINE TRAINING MISSION IN THE AREA AROUND DADE-COLLIER ARPT. I HAD PREVIOUSLY ACCOMPLISHED 2 FULL STOP LNDGS AT DADE-COLLIER PRIOR TO THE EMER. ON TKOF FOLLOWING THE 2ND FULL STOP LNDG; I CLBED TO 500 FT AGL AND PUSHED FORWARD ON THE YOKE TO DECREASE CLB ANGLE TO ACCELERATE. THE YOKE SEEMED TO STICK AND TOOK MORE FORCE THAN NORMAL TO PUSH OVER. AT THAT POINT; THE FLT CTLS FELT NORMAL AND I MADE A CLBING L TURN. I BEGAN TO LEVEL OFF AT 2200 FT AND DISCOVERED THAT THE YOKE WOULD NOT MOVE FORE OR AFT. I LEVELED OFF USING PWR AND TRIM. TRIM APPEARED TO WORK NORMALLY AND I HAD AILERON CTL TO ROLL L AND HAD RUDDER CTL. I TURNED L BACK TOWARDS DADE-COLLIER AND ENTERED A L DOWNWIND. I MADE GENTLE L TURNS AND USED PWR AND TRIM TO CTL GLIDE PATH AND DSCNT. LNDG WAS UNEVENTFUL. ON LNDG ROLLOUT; I REGAINED AFT YOKE AUTH BUT NO FORWARD CTL. MAINT INSPECTION REVEALED THAT THE WIRING HARNESS AND VOR/ILS ANTENNAE SPLITTER/COUPLER HAD DROPPED DOWN AND INTERFERED WITH THE YOKE. MAINT DIRECTIVES NEED TO EMPHASIZE THE IMPORTANCE OF TYING THE WIRING BUNDLES BEHIND THE INST PANEL AND SECURING THESE BUNDLES TO A HARD POINT TO PREVENT ANY MOVEMENT.