What was found
(CAN) BOTH FLOW PACKS INSTALLED ON AIRCRAFT CHECKED ON GROUND RUN, VERY SLOW TO PRODUCE PRESSURIZATION ON EITHER SIDE. TESTED BOTH SIDES IN HANGAR IAW MM, FOUND FIRE WALL SHUTOFF VALVE WOULD NOT OPEN AT SPECIFIED PRESSURE. LEFT SIDE REQUIRED 30 PSI AND OVER A MINUTE TO START OPENING AND 40 PSI TO FULLY OPEN. MM SPECIFIES 19 PSI AND MAX 25 SECONDS TO FULLY OPEN. RIGHT SIDE REQUIRES 19 PSI TO START OPENING AND 30 PSI TO FULLY OPEN. (TC NR 20091202018)