A DC9-40 while parked on the gate was evacuate/evacuationed due to a forward lavatory smoke alarm caused by leaking hydraulic fluid being ingested in the air conditioning system.

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Attributes
ACN	430738
Time
Date	199903
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mbs.airport
State Reference	MI
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	DC-9 40
Operating Under FAR Part	Part 121
Flight Phase	ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	controller : military controller : non radar controller : radar pilot : atp
Experience	controller military : 8 controller non radar : 1 controller radar : 17 controller supervisory : 3 flight time last 90 days : 150 flight time total : 10000 flight time type : 1400
ASRS Report	430738
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical cabin event other other anomaly
Independent Detector	aircraft equipment other aircraft equipment : lavatory smoke alarm other other : cab 3
Resolutory Action	aircraft : evacuated flight crew : declared emergency flight crew : took precautionary avoidance action
Consequence	other
Factors
Maintenance	performance deficiency : inspection performance deficiency : repair
Supplementary
Problem Areas	Maintenance Human Performance Company Aircraft
Primary Problem	Aircraft

Narrative:

Forward lavatory smoke alarm sounded. We deplaned the aircraft. I must give praise to lead cabin attendant, xyz abc, for his PA to the passenger, to quickly get out of their seats and exit the aircraft through the main doors. We (xyz abc and I) had checked the forward lavatory finding nothing. However, we both felt it best, what we had done. Later we found out a hydraulic leak caused the alarm to sound. The fluid was picked up by the air cycler machine sending small particles through the vents setting off the alarm.

Original NASA ASRS Text

Title: A DC9-40 WHILE PARKED ON THE GATE WAS EVACED DUE TO A FORWARD LAVATORY SMOKE ALARM CAUSED BY LEAKING HYD FLUID BEING INGESTED IN THE AIR CONDITIONING SYS.

Narrative: FORWARD LAVATORY SMOKE ALARM SOUNDED. WE DEPLANED THE ACFT. I MUST GIVE PRAISE TO LEAD CABIN ATTENDANT, XYZ ABC, FOR HIS PA TO THE PAX, TO QUICKLY GET OUT OF THEIR SEATS AND EXIT THE ACFT THROUGH THE MAIN DOORS. WE (XYZ ABC AND I) HAD CHKED THE FORWARD LAVATORY FINDING NOTHING. HOWEVER, WE BOTH FELT IT BEST, WHAT WE HAD DONE. LATER WE FOUND OUT A HYD LEAK CAUSED THE ALARM TO SOUND. THE FLUID WAS PICKED UP BY THE AIR CYCLER MACHINE SENDING SMALL PARTICLES THROUGH THE VENTS SETTING OFF THE ALARM.

Data retrieved from NASA's ASRS site as of July 2007 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.