FK10 first officer noticed a fuel puddle under #1 engine. Engine had a small internal fire.

Attributes
ACN	413781
Time
Date	199808
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : stl airport : stl
State Reference	MO
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Navigation In Use	Other Other
Flight Phase	ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	413781
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other other : unspecified
Resolutory Action	other
Consequence	other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

After block in and checklist, I proceeded to do external postflt as required. Upon reaching engine #1, I noticed a fuel puddle about 3 ft wide under engine. I could not determine if it was from our aircraft or a previously departed aircraft. To avoid calling contract maintenance unnecessarily, I returned to jetbridge and advised captain of the leak possibility, and I would check the engine again while he pressurized the fuel line. I returned to engine and could not see any active leak. As I returned to jetbridge I noticed light smoke coming from the intake. By this time the captain had noticed the smell in the cockpit and had shut off pressure. He advised me to motor #1 engine to put out what appeared to be a tailpipe fire. He, seeing that local personnel had already called the fire trucks and were on site and the few remaining passenger had already exited, went outside to monitor the engine. We stopped motoring and captain checked the engine and advised motoring again, which stopped the last vestiges of smoke and fire. No fire suppression was required or used from cockpit or externally. Needless to say, we now knew it was our aircraft which needed maintenance.

Original NASA ASRS Text

Title: FK10 FO NOTICED A FUEL PUDDLE UNDER #1 ENG. ENG HAD A SMALL INTERNAL FIRE.

Narrative: AFTER BLOCK IN AND CHKLIST, I PROCEEDED TO DO EXTERNAL POSTFLT AS REQUIRED. UPON REACHING ENG #1, I NOTICED A FUEL PUDDLE ABOUT 3 FT WIDE UNDER ENG. I COULD NOT DETERMINE IF IT WAS FROM OUR ACFT OR A PREVIOUSLY DEPARTED ACFT. TO AVOID CALLING CONTRACT MAINT UNNECESSARILY, I RETURNED TO JETBRIDGE AND ADVISED CAPT OF THE LEAK POSSIBILITY, AND I WOULD CHK THE ENG AGAIN WHILE HE PRESSURIZED THE FUEL LINE. I RETURNED TO ENG AND COULD NOT SEE ANY ACTIVE LEAK. AS I RETURNED TO JETBRIDGE I NOTICED LIGHT SMOKE COMING FROM THE INTAKE. BY THIS TIME THE CAPT HAD NOTICED THE SMELL IN THE COCKPIT AND HAD SHUT OFF PRESSURE. HE ADVISED ME TO MOTOR #1 ENG TO PUT OUT WHAT APPEARED TO BE A TAILPIPE FIRE. HE, SEEING THAT LCL PERSONNEL HAD ALREADY CALLED THE FIRE TRUCKS AND WERE ON SITE AND THE FEW REMAINING PAX HAD ALREADY EXITED, WENT OUTSIDE TO MONITOR THE ENG. WE STOPPED MOTORING AND CAPT CHKED THE ENG AND ADVISED MOTORING AGAIN, WHICH STOPPED THE LAST VESTIGES OF SMOKE AND FIRE. NO FIRE SUPPRESSION WAS REQUIRED OR USED FROM COCKPIT OR EXTERNALLY. NEEDLESS TO SAY, WE NOW KNEW IT WAS OUR ACFT WHICH NEEDED MAINT.

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.