scottco189

Got a call from a fellow maintainer in Iraq asking for help with a pressurization problem. The 130 pressurizes fine in auto and manual until underfloor heat is turned on. When it is turned on, the guage climbs 1000 feet, which is normal. However, it fluctuates 700-1000 feet the whole flight. This problem has came down over 4 times and almost the whole system has been swapped out. Any suggestions on where they should start?