What is indicated by the pointer of the emergency oxygen cylinder when it is considered adequately charged?

The pointer of the emergency oxygen cylinder is considered adequately charged when it is positioned anywhere in the green band on the pressure gauge. The green band represents a safe operating range for the oxygen cylinder, indicating that there is sufficient pressure for the system to function effectively during an emergency.

In contrast, the other bands on the pressure gauge are indicative of different status levels. The yellow band usually signals a warning or caution, indicating that the pressure is lower than the recommended level and may not provide enough oxygen in an emergency situation. The black band often denotes a normal operating range, but it is not typically used for oxygen pressure measurements in this context. The red band indicates that the cylinder is critically low on oxygen and may not function properly, which is unsafe for use. Therefore, only the green band confirms that the oxygen cylinder is adequately pressurized and ready for use.