How can an oxygen panel be opened on the ERJ if it doesn't open automatically?

In the case of the ERJ, if the oxygen panel does not open automatically, the appropriate method to access it is by prying the panel or using the Multi-Function Display (MDT). This approach is designed for safety and functionality, ensuring that crew members can quickly gain access to oxygen masks when necessary, especially in emergency situations.

The MDT can provide instructions or assist in opening the panel if it becomes jammed or does not respond as expected. Prying the panel is a last resort method that should be undertaken following the manufacturer's guidelines to prevent damage or malfunction. This method is key to maintaining the integrity and accessibility of critical emergency systems aboard the aircraft.

Other methods such as using a key, tearing the panel, or turning a knob may not be practical or available in this context, making the correct option the most reliable procedure to follow in an emergency.