What was found
I'M A TECHNICIAN IN TURKEY.I'M NOT REPORTING ON BEHALF OF AN ORGANIZATION. I HAVE 22 YEARS OF EXPERIENCE IN BOEING 737 AIRCRAFT. I'M NOT WORKING NOW. BUT I FORWARDED THIS ISSUE TO ENGINEERING DEPARTMENTS IN THE ORGANIZATIONS I WORKED WITH. BUT THEY DIDN'T MAKE ANY ATTEMPT ON THIS.
I WOULD LIKE TO INFORM YOU THAT THERE IS A SYSTEM ERROR IN THE PRECOOLER CONTROL SYSTEM IN THE ENGINE BLEED SYSTEM ON BOEING 737 AIRCRAFT.
THE PRECOOLER CONTROL VALVE USED IN THIS SYSTEM, WHEN 390 F SENSOR REMAINS OPEN OR IF THERE IS AIR LEAKAGE FROM THE 390 F SENSOR CONTROL PRESSURE SENS LINE OR WING THERMAL ANTI ICE SOLENOID REMAINS OPEN, PRECOOLER CONTROL VALVE GOES FULLY OPEN WITH SPRING LOADED. IF PRECOOLER CONTROL VALVE F