True or False: It is safe to open the door when the Pressure Indicator Light is flashing red?

• A. True
• B. False
• C. Not specified
• D. Only with captain's approval

Answer: (B)

A flashing red Pressure Indicator Light signals dangerous or unstable pressure. Opening the door at that moment can cause a rapid and uncontrolled pressure change, risking injury to people nearby, door or equipment damage, or a failed seal. Doors and their interlocks are designed to prevent opening until the pressure is within safe limits. So the proper action is to keep the door closed and wait for the indicator to indicate a safe condition before attempting to open. The other options don’t fit because they either imply safety under a risky condition, rely on approval to override the safety signal, or ignore the explicit warning the light provides.