What is one piece of emergency equipment used to fight hidden fires on an aircraft?

The correct answer is the crash ax, which is a specialized tool designed for emergency situations, particularly in aircraft where access to certain areas may be obstructed due to fire or structural damage. The crash ax can be used to access hidden or concealed fires by cutting through materials, allowing flight attendants or emergency responders to reach and suppress fires that may not be visible or accessible otherwise.

While a fire extinguisher is crucial for fighting fires, it is primarily used for visible flames rather than for reaching hidden fires directly. Smoke detectors are essential for alerting the crew to the presence of smoke, but they don't provide a means to actively combat a fire. Emergency blankets can help with insulation or protecting individuals from heat but are not effective for extinguishing fires. Thus, the crash ax serves a unique purpose in emergency fire situations on an aircraft, making it a critical piece of equipment for the safety of everyone on board.