If smoke / fumes are uncontrollable, the crew is supposed to descent to the lowest safe altitude and at 14000 or below, the PRESSURIZATION MODE SELECTOR should be positioned to MAN while the OUTFLOW VALVE switch should be opened. What is the main cause of the OUTFLOW VALVE operation?
A.A.To depressurize the cabin
B.B.To provide maximum cabin ventilation
C.C.To provide smoke/fumes contamination of/from other compartments
D.D.This causes the cabin airflow to carry smoke/fumes aft
正确答案是D