Widebody transport training flight has a fire warning, dumps fuel and lands.

Attributes
ACN	143708
Time
Date	199004
Day	Wed
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : sfo
State Reference	CA
Altitude	msl bound lower : 11000 msl bound upper : 11000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : oak
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 4 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 18000 flight time type : 150
ASRS Report	143708
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	flight crew : declared emergency flight crew : overcame equipment problem
Consequence	other
Supplementary
Primary Problem	Aircraft

Narrative:

At about 11000' #4 engine fire warning light illuminated, #4 engine fire procedure was accomplished with engine being shut down and both bottles discharged. Fire light remained illuminated and subsequent scan of engine by first officer showed no indication of fire. All engine indications were normal except fire warning, which remained on for about 8-10 minutes. Fuel was dumped to maximum landing weight, and turning final to 28R at sfo the fire light went out. On inspection by mechanic a bolt was found missing from the angle drive on the accessory drive case and was found laying in the bottom of the engine cowl. This caused the loss of engine oil which caught fire and burned outside of the engine, burning wire bundles and presumably damaging the fire detection loops which may have caused a false fire indication even though fire was out. Oil tank gauge for #4 engine showed full after engine fire procedure. The fire detection did not test properly on the ground at sfo on landing after fire.

Original NASA ASRS Text

Title: WDB TRAINING FLT HAS A FIRE WARNING, DUMPS FUEL AND LANDS.

Narrative: AT ABOUT 11000' #4 ENGINE FIRE WARNING LIGHT ILLUMINATED, #4 ENGINE FIRE PROC WAS ACCOMPLISHED WITH ENGINE BEING SHUT DOWN AND BOTH BOTTLES DISCHARGED. FIRE LIGHT REMAINED ILLUMINATED AND SUBSEQUENT SCAN OF ENGINE BY F/O SHOWED NO INDICATION OF FIRE. ALL ENGINE INDICATIONS WERE NORMAL EXCEPT FIRE WARNING, WHICH REMAINED ON FOR ABOUT 8-10 MINUTES. FUEL WAS DUMPED TO MAX LNDG WEIGHT, AND TURNING FINAL TO 28R AT SFO THE FIRE LIGHT WENT OUT. ON INSPECTION BY MECHANIC A BOLT WAS FOUND MISSING FROM THE ANGLE DRIVE ON THE ACCESSORY DRIVE CASE AND WAS FOUND LAYING IN THE BOTTOM OF THE ENGINE COWL. THIS CAUSED THE LOSS OF ENGINE OIL WHICH CAUGHT FIRE AND BURNED OUTSIDE OF THE ENGINE, BURNING WIRE BUNDLES AND PRESUMABLY DAMAGING THE FIRE DETECTION LOOPS WHICH MAY HAVE CAUSED A FALSE FIRE INDICATION EVEN THOUGH FIRE WAS OUT. OIL TANK GAUGE FOR #4 ENGINE SHOWED FULL AFTER ENGINE FIRE PROC. THE FIRE DETECTION DID NOT TEST PROPERLY ON THE GND AT SFO ON LNDG AFTER FIRE.

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.