Which manual contains the chart for confirming the correct O2 cylinder quantity gauge temperature and pressure?

The Ground Service Manual is the correct reference for confirming the correct oxygen cylinder quantity gauge's temperature and pressure specifications. This manual provides detailed procedures and specifications required for servicing the aircraft on the ground, including maintenance and checks related to oxygen systems.

These specifications are critical for ensuring that the oxygen systems are functioning properly and are safe for operational use. The Ground Service Manual typically includes relevant charts, data for servicing and maintaining ground equipment, and guidelines for handling oxygen cylinders, which directly relate to temperature and pressure readings.

In contrast, the other manuals focus on different aspects of the aircraft's operation or maintenance. The Airframe Maintenance Manual is more focused on the structural and mechanical components of the aircraft; the Aircraft Operations Manual deals with overall operational procedures and guidelines for flight operations; and the Flight Operations Manual contains specific information for flight crews pertaining to flying the aircraft. Each of these manuals serves essential purposes but does not specifically address the requirements for service checks concerning oxygen cylinder gauges as the Ground Service Manual does.