CPR ACFT HAS JAMMED YOKE; MAKES HARD LNDG.

Narrative

THE FO WAS FLYING A VISUAL APCH. THE APCH WAS STABILIZED AT VREF PLUS 10; FULL FLAPS; ON VASI. CALLOUTS WERE MADE; CHKLIST ACCOMPLISHED IN ACCORDANCE WITH COMPANY PROCS. THINGS SEEMED ROUTINE ON A GOOD VFR DAY. BELOW 200 FT AGL SINK RATE INCREASED. I CALLED 'DSNDING BELOW VASI.' THE FO TRIMMED NOSE-UP AND APPEARED TO PULL BACK ON YOKE. OUR INCREASING SINK RATE REMAINED UNCHANGED. I COMMANDED 'PULL UP.' THERE STILL WAS NO CHANGE IN SINK RATE. I PROCEEDED TO TAKE OVER CTLS. THE FO SIMULTANEOUSLY SAID; 'TAKE IT.' I PULLED ON THE YOKE WITH NO RESULTS. JUST PRIOR TO TOUCHDOWN; I PULLED AS HARD AS A COULD WITH BOTH HANDS AND GOT THE YOKE TO MOVE. THE NOSE PITCHED UP SLIGHTLY. WE STILL LANDED HARD. AFTER SHUTDOWN WE DISCOVERED A STURDY METAL PAPER HOLDER/CLIPBOARD COMMONLY CARRIED ON CPR ACFT. IT WAS WEDGED BTWN THE FO SEAT AND YOKE IN A MANNER THAT PREVENTED AFT MOVEMENT OF THE YOKE. IF THESE 'CANS' ARE CARRIED ON YOUR ACFT THEY SHOULD ALWAYS BE STOWED IN A DESIGNATED PLACE THAT PRECLUDES INTERFERING WITH FLT CTLS. THE FO INDICATED HE TYPICALLY STOWED THE CLIP AGAINST THE R COCKPIT SIDEWALL.