<< >> NASA ASRS Report 982607, December 2011

A B737-700 aft lavatory smoke detector alerted on approach so the QRH was completed; an emergency declared and the aircraft proceeded directly to the airport but the smoke alarm was determined to be false.

Attributes
ACN	982607
Time
Date	201112
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-700
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Component
Aircraft Component	Toilet Smoke Overheat Fire Detectors & Warning
Person 1
Function	First Officer
Experience	Flight Crew Last 90 Days 218
Person 2
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 173
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

The 'C' flight attendant called and informed us the aft lavatory smoke detector was going off. We went to the QRH; donned the O2 masks; and had the flight attendants verify no smoke; fumes; or fire. After deciding that we had a malfunctioning detector; we then pulled the circuit breaker for that item as directed by the QRH. We then removed our masks to help with our communication. We also decided that the lack of detection ability for smoke/fire in the aft lavatory constituted an emergency and we declared emergency. We proceeded direct to the airport from around 59 miles; had airfield rescue and fire fighters check us out; and then proceeded to the gate.

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Original NASA ASRS Text

Title: A B737-700 aft lavatory smoke detector alerted on approach so the QRH was completed; an emergency declared and the aircraft proceeded directly to the airport but the smoke alarm was determined to be false.

Narrative: The 'C' Flight Attendant called and informed us the aft lavatory smoke detector was going off. We went to the QRH; donned the O2 masks; and had the flight attendants verify no smoke; fumes; or fire. After deciding that we had a malfunctioning detector; we then pulled the circuit breaker for that item as directed by the QRH. We then removed our masks to help with our communication. We also decided that the lack of detection ability for smoke/fire in the aft lavatory constituted an emergency and we declared emergency. We proceeded direct to the airport from around 59 miles; had Airfield Rescue and Fire Fighters check us out; and then proceeded to the gate.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.