Cabin pressurization problems are caused by leakage, low bleed duct pressur, OFV and CPC, and defective bleed air system leads to the majority of the defects
If either engine duct pressure is very low during climb, rate of climb will
be much higher than normal and cabin altitude will increase rapidly. However, if both engine bleed pressures return to normal operations. CPC would modulate OFV to decrease cabin altitude, so rate of descent indication may be shown.
Last edited by DongJoon Choi; 12th Jul 2011 at 01:12.