When can you not use the bathroom on a plane?

When Airplane Lavatories Are Unavailable

During the initial takeoff and landing phases of a flight, aircraft lavatories are typically closed as a safety precaution. This closure ensures that passengers remain seated and properly restrained in their seats, minimizing the risk of injury in the event of turbulence or emergency maneuvers.

The seatbelt sign is illuminated during these critical phases to indicate that passengers should remain in their seats with their seatbelts fastened. Once the plane reaches a stable cruising altitude, the seatbelt sign is extinguished, signaling that passengers are free to move about the cabin, including using the lavatories.

However, there may be certain circumstances during the cruising phase where the lavatories may be temporarily closed for operational reasons. These include:

• Turbulence: In the event of moderate to severe turbulence, the flight crew may order the closure of the lavatories to prevent injuries due to spills or falls.
• Technical malfunctions: If there are any issues with the lavatory system, such as a clogged toilet or a broken sink, the lavatories may be closed until repairs can be made.
• Flight attendant duties: During meal service or other periods of high workload, the flight attendants may temporarily close the lavatories to ensure efficient cabin service.
• Emergency situations: In the unlikely event of an emergency situation, such as a medical emergency or a security threat, the flight crew may order the closure of the lavatories to facilitate crew access to the affected areas.

It is important to note that the lavatories are generally available throughout the majority of the flight. However, it is advisable to use the lavatories when the seatbelt sign is extinguished and to check with a flight attendant if the lavatories are unexpectedly closed for any reason.