Final answer:
The statement is true; not turning the OXY flow knob to OFF before mask removal can overwhelm an aircraft's OBOGS, triggering a DEGD caution.
Step-by-step explanation:
The statement is true. Removing the mask without turning the OXY flow knob to OFF can indeed overwhelm the system's capacity, which may result in an OBOGS DEGD caution. OBOGS stands for On-Board Oxygen Generating System, which is commonly used in military aircraft to provide pilots with a continuous supply of oxygen.
The system works by drawing in air from the aircraft's engine compressors and separates oxygen from other gases. If the oxygen flow is not properly shut off before mask removal, the system's balance can be disrupted, causing an overload to its capacity, and triggering safety cautions or warnings.
Removing the mask without placing the OXY flow knob to OFF can overwhelm the system capacity and may result in an OBOGS DEGD caution.