What was found
AFTER DEPARTURE, ACFT WAS CLIMBING & ACCELERATING THRU 1300 MSL & 180 KNOTA. NO PRIMARY OR SECONDARY TRIM WAS AVAILABLE. ALL CB WERE IN, QRH WAS REF. ACFT WAS LEVELED AT 5000 MSL & SLOWED TO 210 KNOTS. SPEED CONTROL KNOB WAS NOT FUNCTIONING & WOULD NOT CONTROL SALMON SPEED BUGS. ACFT RETURNED, NORMAL LANDING WAS MADE. AFTER AUTO PILOT WAS ENGAGED TRIM BEGAN WORKING AGAIN. INSPECTED HORIZONTAL JACKSCREW AREA, NO DEFECTS NOTED MM 27-40-00. PERFORMED OPERATIONS CHECK OF HORIZONTAL STAB TRIM ADJUSTMENT TEST OF BRAKE OVERRIDE SWITCH, OPERATIONS CHECKED GOOD IAW AMM 27-40-00-5-3. INSPECTED HORIZONTAL STAB TRIM CONTROL WHEEL, CONTROL HANDLES & ALT TRIM SWITCHES, ALL SWITCHES OPERATED NORMALLY, NO DISCREPANCIES FOUND IAW AMM 27-40-09-5-6. PERFORMED DFGS SWITCHES, BUTTONS & RTS, NO DEFECTS NOTED. OPERATIONS CHECKED GOOD IAW AMM 22-01-05.