The aircraft emergency frequency is a frequency used on the aircraftradio band reserved for emergencycommunications for aircraft in distress. The frequencies are 121.500 MHz for civilian and 243.000 MHz for military use. Both are in use at the international level. In the U.S.A. 121.500 is monitored by ATC towers, FSS services, national ATC centers and other flight and emergency services. The emergency frequency is sometimes reffered to as 'Guard'. Separate frequencies exist for military and other government emergency frequencies. Sine waves of various frequencies; the lower waves have higher frequencies than those above. ... An aircraft is any machine capable of atmospheric flight. ... An emergency is a situation that poses an immediate threat to human life or serious damage to property. ... The term communications is used in a number of disciplines: Communications, also known as communication studies is the academic discipline which studies communication. ... This is a disambiguation page — a navigational aid which lists other pages that might otherwise share the same title. ... MegaHertz (MHz) is the name given to one million (106) Hertz, a measure of frequency. ... For other uses, see United States (disambiguation) and US (disambiguation). ... Air Traffic Control Towers (ATCTs) at Schiphol Airport Air Traffic Control (ATC) is a service provided by ground based controllers who direct aircraft on the ground and in the air to ensure safe, orderly and efficient traffic flow. ... FSS may mean: flight service station fixed service satellite Federal Supply Service of the U.S. government Forensic Science Service of the U.K. government Friendship Sloop Society [1] Floral Supply Syndicate [2] Five Star Stories This is a disambiguation page, a list of pages that otherwise might share the...
An emergency signal may be transmitted by voluntary action by the worker, by sensing the worker's physical condition, or by sensing the condition of an environmental protection system (such as a self-contained breathing apparatus) carded by the worker.
In response to receipt of an emergency event signal by the controller/modem module 91 from the vessel data module 93, the module 91 first issues a wake-up command on a signal line 95 that is received by a data interface module 97 for transmission apparatus 101.
A decoded emergency event signal, DEES, is issued by the EES decoder module 137 on a first signal line 139, and the DEES is received by a signal splitter module 141 that issues the DEES on a second signal line 143 and on a third signal line 145.
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