What was found
RIGHT PACK TRIPPED OFF IN CLIMB INITIALLY WOULD NO T RESET. LEFT PACK WAS UNABLE TO PRESSURIZE ACFT. PERFORMED OPS CHECK OF RT PACK FOUND RAM AIR DOOR ACTUATOR INOP. DURING BITE FOUND CTC FAILED IN RT PACK POSITION 5, RESET NO HELP. INSPECTED RT PACK OUTLET AIR CON CHECK VALVE, FOUND IN STUCK IN OPEN POSITION. IAW FIM TASK 21-61 TAS KS 865 & 21-52 TASK 821. MEASURE TEMPS AT BOTH HTX ON RT PACK CHECKED WITHIN NORMAL RANGE. TS /CW. IAW T/S AND FIM 21-61 TASK 865. R & R CTC, OPS CHECK GOOD, BITE CHECK GOOD. INSPECTED RT PACK OUTLET AIR CONDITIONING CHECK VALVE FOUND IT TO BE A FLAPPER CHECK VALVE IN SERVICABLE CONDITION NO NEED TO CHANGE.