What was found
DURING CRUISE THE PILOTS REPORTED THAT THEY HAD A LOSS OF PRESSURIZATION AT 240. MAINTENANC REINSTALLED ELECTRO PNUEMATIC OUT FLOW VALVE IAW EMB120 MM. 21-30-03. FOUND INSULATION AROUND ELECTRO PNUEMATIC OUT FLOW VALVE LOOSE RESECURED INSULATION AS REQUIRED WITH FAR CARGO PIT TAPE. FOUND TWO B-NUTS LOOSE AT PNEUMATIC OUT FLOW VALVE. TIGHTENED B-NUTS AS REQUIRED PRESSURIZED ACFT ON GROUND IN MANUAL MODE UTILIZING APU BLEED TO MAX DIFF ALL. SYSTEMS APPEAR TO FUNCTION NORMALLY ON GROUND IN MAN MODE. OPERATIONAL CHECK FLIGHT FOR PRESSURIZATION WAS SATISFACTORY.