How many POBs are installed onboard the CRJ 200 aircraft?

The correct answer is that there are two POBs (Portable Oxygen Bottles) installed on board the CRJ 200 aircraft. Each POB is used to provide supplemental oxygen to passengers and crew in the event of a cabin decompression or other situations requiring oxygen.

Having two POBs ensures that there are adequate resources readily available for both the cockpit crew and the cabin crew, allowing them to distribute oxygen masks if necessary, particularly in emergency scenarios. This redundancy is crucial for safety and compliance with aviation regulations.

The decision to have two POBs is in line with safety protocols and operational needs, ensuring that everyone on board the aircraft can be attended to effectively.