如果故障信息依然存在，按压航电设备测试面板上的音频取消按钮。

Distribution system refers to that portion of the system which is used to distribute high or low pressure air to using systems.

Oxygen system includes bottles, relief valves, shut-off valves, outlets, regulators, masks, etc.

Those units and components are used to store, regulate, and deliver oxygen to the passengers and crew.

These devices are used to stabilize the aircraft while on the ground and prevent damage by ground contact. Includes items such as shock strut, skid blocks, wheels, etc.

That portion of the system which supports the nose of the aircraft while the aircraft is on the ground, including items such as shock struts, drag struts, doors, linkages, attach bolts, etc.

The lighting subsystems in the areas in which the passengers are seated and in buffet/galley, lavatories, lounges and coat rooms. Includes items such as direct and indirect illumination, passenger call system, lighted signs, etc.

That portion of the system provides the major support for the aircraft while on the ground, including items such as shock struts, bogie axles, drag struts, doors, linkages, attach bolts, etc.

The units and components which give audible or visual warning of conditions in unrelated systems.

The portion of the system which is used to eliminate or prevent the formation of ice on propellers.

For turbine type power plants using air as the anti-icing medium, engine anti-icing is contained under Air System.