检查客舱应急话筒是否在位且状态良好。检查应急定位信标发射机状态是否正常，固定是否牢靠。
Check cabin emergency speakers for presence and condition. Check emergency locator transmitter for general condition, security.
检查客舱应急话筒是否在位且状态良好。检查应急定位信标发射机状态是否正常，固定是否牢靠。
Check cabin emergency speakers for presence and condition. Check emergency locator transmitter for general condition, security.
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