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A comment on FAA NOTAM System Outage Affecting All North America Flights. Parent comment

Re:FAA NOTAM System Outage Affecting All North America Flights by devmor on Wednesday January 11, 2023 @12:50PM (#34341691)
I wish they just had a steady LED from the mains power on them when the battery was dead. Seems much easier to me.
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Re:FAA NOTAM System Outage Affecting All North America Flights by bombcar on Wednesday January 11, 2023 @01:19PM (#34342204)
Yeah, I bet one somewhere has it, but most just flash-when-chirp which is kinda annoying:

This alarm has a low/missing battery monitor circuit which will cause the alarm to “chirp’” approximately every 30 - 40 seconds for a minimum of seven (7) days when the battery gets low. The chirp will be accompanied by a flash of the Safety Light. Replace both bat- teries when this condition occurs.

Some of the newer ones come with a built-in Lithium battery that supposedly is good for 10 years.

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