Galley heat is controlled at the galley electrical panel. This panel is specifically set up with switches and circuit breakers that power the galley appliances and warmers, and it’s located in the galley for easy access by the crew during service. The cockpit overhead panel handles flight-deck systems, not galley heat. The lavatory cabinet and the passenger cabin ceiling don’t contain the controls for galley heat. Keeping the control point in the galley panel ensures proper electrical protection and quick, localized control during operations.

Communicating between forward and aft crew relies on the interphone system at each duty station. The control labeled for Attendant is the dedicated interphone link to the other flight attendant, so pressing it opens a private line to the aft station and lets you speak directly without broadcast to passengers. The PA button sends a message to passengers and isn’t used to reach the other crew member. The CALL button might summon or alert, but it isn’t the specific inter-station connection used for routine crew-to-crew communication. The COMM button, if present, isn’t the standard interphone path between the two attendants. So the button specifically labeled Attendant is the one designed for talking to the other flight attendant.

Safety equipment is provided for every person who may be on the flight deck, including the observer. Oxygen masks are there to ensure immediate access to breathable air in case of a depressurization or smoke-filled cockpit, while life vests are kept for flotation in the event of a water landing. The observer is positioned in a way that could require access to these safety items in an emergency, so both are issued. That’s why the best answer is that yes, oxygen masks and life vests are provided for both flight deck crewmembers and the observer.

The flight deck takes priority over the cabin crew for the PA system, because safety-critical information must reach passengers immediately. The cockpit has the ability to interrupt or override the cabin PA when the crew deems a message essential, such as safety instructions, warnings, or urgent updates. The cabin PA is mainly for routine announcements by the flight attendants, but it cannot block or slow down a cockpit announcement. So saying the FA has priority is not correct—the flight deck has the authority to take control when needed.