A BE1900D DURING CLB AT 10000 FT AILERONS FELT HVY AND REQUIRED MORE AILERON TRIM THAN NORMAL. ON INSPECTION; FOUND A FORWARD RUDDER AILERON INTERCONNECT SPRING BROKEN.

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ON JUN/FRI/05; I WAS SERVING AS PIC OF FLT ABC FROM ZZZ TO ZZZ1 ON ACFT X. WE DEPARTED THE GATE AT ZZZ AT XA37; PERFORMED ALL CHKLISTS -- AFTER START; TAXI (INCLUDING FLT CTL CHK); AND BEFORE TKOF CHKLISTS. DURING THE FLT CTL CHK; THERE WAS NO INDICATION OF BINDING IN THE CTLS. THE AILERON AND RUDDER HAD FULL TRAVEL AND FULL DEFLECTION. WE DEPARTED; TOOK OFF FROM RWY 17L AT XA42. THE FO WAS THE PF. DURING THE CLB PHASE OF THE FLT AT APPROX 10000 FT MSL; THE FO REMARKED THAT THE AILERONS FELT A LITTLE HVY AND SEEMED TO REQUIRE MORE AILERON TRIM THAN USUAL. AT NO POINT WAS THE ACFT NOT CTLABLE AND AT NO POINT WERE WE UNABLE TO GET FULL DEFLECTION OR FULL TRAVEL FROM THE FLT CTLS. THERE WAS NO INDICATION FROM THE COCKPIT OR FROM THE FEEL OF THE ACFT THAT ANYTHING WAS OUT OF THE ORDINARY OTHER THAN MAYBE THE AILERON TRIM NEEDED READJUSTED. CONTINUED CLBOUT TO ALT; LEVELED OFF; AND RE-TRIMMED THE AILERON TRIM APPROX 3 UNITS WHICH WAS MORE NORMAL. WE DISCUSSED HOW THE AIRPLANE HANDLED AT THE DIFFERENT PHASES OF THE FLT THUS FAR; AGREEING THAT IT FLEW NORMALLY EXCEPT FOR NEEDING EXTRA TRIM IN THE CLBOUT. FELT IT SAFE TO CONTINUE TO ZZZ1 WHERE WE WOULD WRITE UP THE AILERON TRIM. AT XB52; WE LANDED IN ZZZ1 WITHOUT INCIDENT; ACCIDENT OR INJURY TO PERSONNEL. CONTACTED MAINT CTL; WROTE UP THE AILERON TRIM; THEREBY GNDING THE ACFT. CONTRACT MAINT WAS ARRANGED AND INSPECTED THE AIRPLANE. UPON INSPECTION; THE CONTRACT MECHS HAD FOUND A 'FORWARD RUDDER AILERON INTERCONNECT SPRING' HAD BROKEN. RPT WAS FILED WITH COMPANY AND NTSB WAS NOTIFIED VIA DIRECTOR OF SAFETY.