A B722 crew received a fire warning on #3 engine cruising at FL240 south of day.

Attributes
ACN	517844
Time
Date	200107
Day	Wed
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : day.airport
State Reference	OH
Altitude	msl single value : 24000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 120 flight time total : 3850 flight time type : 800
ASRS Report	517844
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : eng fire warning red light and bell other flight crewa other flight crewb other other : s/o 5
Resolutory Action	flight crew : diverted to another airport flight crew : declared emergency flight crew : landed as precaution other
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

While flying level at FL240, #3 engine fire warning sounded. All engine parameters were in normal range. After brief pause while the fire light was still on, decided to shut engine down. Performed emergency procedures. The fire light remained on. Declared an emergency and landed at closest airport, which was day airport. Landed without incident. Light remained on entire flight. Upon inspection by emergency airport response crew, engine checked out and no fire was noted. (Turns out it was a fire loop problem.)

Original NASA ASRS Text

Title: A B722 CREW RECEIVED A FIRE WARNING ON #3 ENG CRUISING AT FL240 S OF DAY.

Narrative: WHILE FLYING LEVEL AT FL240, #3 ENG FIRE WARNING SOUNDED. ALL ENG PARAMETERS WERE IN NORMAL RANGE. AFTER BRIEF PAUSE WHILE THE FIRE LIGHT WAS STILL ON, DECIDED TO SHUT ENG DOWN. PERFORMED EMER PROCS. THE FIRE LIGHT REMAINED ON. DECLARED AN EMER AND LANDED AT CLOSEST ARPT, WHICH WAS DAY ARPT. LANDED WITHOUT INCIDENT. LIGHT REMAINED ON ENTIRE FLT. UPON INSPECTION BY EMER ARPT RESPONSE CREW, ENG CHKED OUT AND NO FIRE WAS NOTED. (TURNS OUT IT WAS A FIRE LOOP PROB.)

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.