Final answer:
A fragmented green blowout disk on the fuselage indicates an oxygen bottle overpressure condition. It is a safety feature designed to release pressurized gas to avoid an explosion.
Step-by-step explanation:
A fragmented green blowout disk on the fuselage indicates that an oxygen bottle overpressure condition has occurred. This is a safety mechanism that allows pressurized gas to escape when the internal pressure exceeds the bottle's designed limits, thus preventing a potential explosion. The color green is often associated with oxygen systems, and the fragmentation of the disk is a designed response to overpressure, ensuring that excess gas is released in a controlled manner.