What safety feature deploys automatically when hull structure is compromised in the CRJ?

The safety feature that deploys automatically when the hull structure is compromised in the CRJ is the emergency oxygen masks. These masks are designed to provide supplemental oxygen to passengers and crew in the event of a loss of cabin pressure, which can occur if the hull integrity is breached. The deployment of the oxygen masks is a critical safety mechanism that ensures occupants can breathe adequately in an emergency situation, thereby maintaining safety until the aircraft can be brought to a safe altitude or landed.

Other options may provide safety benefits but do not address the specific situation of hull compromise directly. The cabin pressure equalization system, for example, is designed to maintain appropriate cabin pressure but does not deploy in response to a breach or compromise. Water evacuation slides are used for rapid evacuation during an emergency landing on water but are not related to hull failure scenarios. The Flight Data Recorder plays an important role in capturing flight information for investigation purposes but does not provide a direct safety feature for occupants during a hull integrity issue.