Which of the following is NOT a component of the CPCS?

The correct response indicates that the emergency landing gear is not a component of the Cabin Pressure Control System (CPCS). The CPCS is specifically designed to manage the cabin pressure during flight, which includes components such as the Cabin Pressure Control Unit, the Primary Valve, and Safety Valves.

The Cabin Pressure Control Unit regulates and monitors cabin pressure, while the Primary Valve manages the intake and release of air to maintain desired pressure levels. Safety valves are critical in preventing any excessive pressure build-up by releasing air when necessary.

In contrast, the emergency landing gear is an entirely separate system that operates independently from the cabin pressure management. Its function is related to ensuring the aircraft can land safely under certain emergency conditions and does not interact with the cabin pressure system. Therefore, recognizing that the emergency landing gear does not fit into the CPCS framework helps clarify the components specific to cabin pressure control.