Large Transport; Low Wing; 2 Turbojet Eng
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 262
Confusion; Distraction; Troubleshooting
Aircraft Equipment Problem Less Severe; Flight Deck / Cabin / Aircraft Event Other / Unknown
Flight Crew Overcame Equipment Problem; General Maintenance Action
Aircraft
FA (Flight Attendant) informed us that the aft lav smoke detector alarm was sounding. She stated that there was no smoke; fumes; or odors.  The only complaint from the passengers was the noise of the alarm. Since there were no indications of a fire; we elected to continue. We looked at the Smoke; Fire; and Fumes checklist in the QRH and decided to follow the guidance in the notes. We pulled the circuit breakers to silence the noise and prevent any possible problems. The other breakers were already pulled and collared. All radios were handled between communications with the FAs; and no calls were missed. We closed down the lavatory for the remainder of the flight. We landed with no issues. No emergency was declared; no passengers were injured or complained; and we wrote up the problem and gave the plane to Maintenance.
The aft F/A (Flight Attendant) called the flight deck and the Captain (Pilot Monitoring) answered. She reported that the aft lav smoke detector was alerting but she didn't smell or see any smoke; nor was there excessive heat. We looked in the QRH for an appropriate checklist. After an exhaustive search by both Pilots; we settled on the Smoke; Fire; Fumes Checklist. The procedure called for pulling circuit breakers to disable a smoke detector that was continuing to alert after smoke has been cleared. The Captain pulled the circuit breakers to disable the smoke detector and any sources of ignition in the aft lav. We decided to consider the aft lav inop and had the F/As direct Passengers toward the forward lav. We continued to our destination without further incident. Neither the F/As nor the Passengers reported any signs of smoke or fumes. We did not declare an emergency with ATC nor alerted them to our situation. At our destination we entered the irregularity in the Maintenance logbook and handed the aircraft off to MX (Maintenance) Personnel.
A flight crew reported that; while in flight; a smoke detector alarm in one of the lavatories activated. After consulting the appropriate checklists; confirming that there was no indication of smoke; fumes; or odors; and securing the lavatory; the decision was made to continue to the destination airport.