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1337Delta764
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Lavatory Smoke Detectors - Battery Vs Hardwired

Wed Jul 10, 2013 8:59 pm

It seems that most older aircraft have battery-powered smoke detectors in the lavatories, while most newer aircraft have hardwired ones. I presume this change was made to prevent tampering by removing the battery.

Does anyone know about when did hardwired smoke detectors in lavatories become standard? I know that in most U.S. homes, hardwired smoke detectors became standard in the early 1990s, however, most residential hardwired smoke detectors have battery backup. I don't think the smoke detectors on most newer aircraft have a battery at all.

[Edited 2013-07-10 14:09:50]
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EMBQA
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RE: Lavatory Smoke Detectors - Battery Vs Hardwired

Wed Jul 10, 2013 10:05 pm

Every smoke detector I've ever seen or worked has been hard wired.
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1337Delta764
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RE: Lavatory Smoke Detectors - Battery Vs Hardwired

Wed Jul 10, 2013 10:25 pm

Quoting EMBQA (Reply 1):

Every smoke detector I've ever seen or worked has been hard wired.

The smoke detectors I have seen on DL's older aircraft (primarily MD-88s and older 752s) look like ordinary household battery-powered smoke detectors, since they do not have a solid green or red light on them (only a red light that flashes every 40-50 seconds). DL's newer Boeings have a hardwired rectangular smoke detector that is integrated into the ceiling.
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celestar345
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RE: Lavatory Smoke Detectors - Battery Vs Hardwired

Fri Jul 12, 2013 6:10 am

Quoting 1337Delta764 (Reply 2):
The smoke detectors I have seen on DL's older aircraft (primarily MD-88s and older 752s) look like ordinary household battery-powered smoke detectors, since they do not have a solid green or red light on them (only a red light that flashes every 40-50 seconds). DL's newer Boeings have a hardwired rectangular smoke detector that is integrated into the ceiling.

Not only old DL, but on some DL 763s the smoke detectors are what looks like household smoke detectors, and sometimes the routine tasks requires changing the batteries!
 
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1337Delta764
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RE: Lavatory Smoke Detectors - Battery Vs Hardwired

Fri Jul 12, 2013 1:57 pm

Quoting celestar345 (Reply 3):
Not only old DL, but on some DL 763s the smoke detectors are what looks like household smoke detectors, and sometimes the routine tasks requires changing the batteries!

I believe the domestic 763s and unmodified 763ERs have battery powered units, however, the modded 763ERs (which got brand new lavatories) I think might have hardwired units.
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