초록 ▼

An alarm system to keep an aircraft pilot or a vehicle operator alert utilizes a first timer to activate visual alarm. The first timer is reset by actuation of the aircraft communications press-to-talk button. If the pilot fails to reset the first timer within a predetermined time, a second timer tr

An alarm system to keep an aircraft pilot or a vehicle operator alert utilizes a first timer to activate visual alarm. The first timer is reset by actuation of the aircraft communications press-to-talk button. If the pilot fails to reset the first timer within a predetermined time, a second timer triggers an audio alarm. Once the audio alarm is triggered, it remains triggered and not resettable for a predetermined period of time. During normal operation of an aircraft during landings and takeoffs, the communications press-to-talk button is actuated as part of normal cockpit operations at intervals shorter than the time for the first timer to complete its timing cycle. Accordingly, an alarm is not generated during such landings and takeoffs, but is effective during cruise flight when the danger of drowsiness is greatest.

대표청구항 ▼

An alarm system for an aircraft having a conventional radio/telecommunication (CR/T) system controlled by an radio telephony (R/T switch, said alarm system comprising first timer means operable, in use, to produce an electrical output signal on timing out, visual alarm means responsive to said outpu

An alarm system for an aircraft having a conventional radio/telecommunication (CR/T) system controlled by an radio telephony (R/T switch, said alarm system comprising first timer means operable, in use, to produce an electrical output signal on timing out, visual alarm means responsive to said output signal from said first timer means, second timer means responsive to said output signal from said first timer means to initiate its operation and operable to produce an electrical output signal on timing out for energising audio alarm means, and rest means associated with said first timer means, whereby first a visual alarm is provided followed by an audio alarm unless said first timer means is rest prior to said second timer means timing out, said reset means comprising switch means actuated by actuation of said R/T switch.