Dual operation emergency passage egress system

A door assembly for a seat unit, comprising:

• a door support member;
• a sliding door mounted on the door support member for movement along a primary track between a retracted position and at least one deployed position in a normal operation mode;
• a secondary track upon which the sliding door moves in a backup operation mode;
• and
• a dual operation slide device that automatically releases a carriage device from a carriage station onto the secondary track in the backup operation mode, the dual operation slide device including:
• the carriage device slidably connected to the primary track to enable lateral movement of the sliding door in the normal operation mode, wherein the carriage device switches from connection with the primary track in the normal operation mode to slidable engagement with the secondary track in the backup operation mode such that the carriage device is movable along the secondary track from the at least one deployed position to the retracted position in the backup operation mode, wherein the carriage station is locked to the carriage device in the normal operation mode;
• and
• a release lever that triggers release of the carriage device from the carriage station in an actuated state of the release lever.

A door assembly for a seat unit, comprising:

• a sliding door mounted for movement along a primary track between a retracted position and at least one deployed position in a normal operation mode;
• a secondary track upon which the sliding door moves in a backup operation mode;
• and
• a dual operation slide device that automatically releases a carriage device from a carriage station onto the secondary track in the backup operation mode, the dual operation slide device including:
• the carriage device slidably connected to the primary track to enable lateral movement of the sliding door in the normal operation mode, wherein the carriage device switches from connection with the primary track in the normal operation mode to slidable engagement with the secondary track in the backup operation mode such that the carriage device is movable along the secondary track from the at least one deployed position to the retracted position in the backup operation mode, wherein the carriage station is locked to the carriage device in the normal operation mode;
• and
• a mechanical fuse assembly that triggers automatic release of the carriage device from the carriage station in response to a threshold force applied to the sliding door, such that a fuse slider of the mechanical fuse assembly moves in response to the threshold force to free a T-slide of the carriage device from engagement with the carriage station.