N543LM
Registered owner: MARKLYN JET PARTS LLC, TX (owner ≠ operator)
Operators of this aircraft
Who operated this tail, and how firmly we know it.
| Operator | Role | Period | Basis |
|---|---|---|---|
| AERO AIR LLC (O9IA) | Certificate holder | — | Matched by certificate designator |
Accident & incident history
No NTSB accidents or incidents on file for this aircraft.
Maintenance disclosures
AIRCRAFT WAS ON A FLIGHT FROM PANC TO KBFI. ON DESCENT INTO KBFI, THE #1 ENGINE FIRE LIGHT BRIEFLY ILLUMINATED AND THEN WENT OUT. IT WAS NOTED BY THE CREW THAT THE #1 ENG FIRE LIGHT ILLUMINATED THREE MORE TIMES FOR LESS THAN A SECOND EACH TIME. THE LIGHT THEN CAME ON AGAIN AND STAYED ON FOR APPROXIMATELY 15 SECONDS. AN EMERGENCY WAS DECLARED TO SEATTLE CENTER AND AS THE CREW WAS BEGINNING EMERGENCY PROCEDURES, THE #1 ENG FIRE LIGHT EXTINGUISHED AND NEVER CAME BACK ON. ALL ENGINE PARAMETER INDICATIONS WERE NORMAL. EMERGENCY DECLARATION WAS RESCINDED AND LANDING INTO KBFI CONTINUED WITH NO FURTHER ISSUES. MAINTENANCE IN KBFI INSPECTED THE FIRE WARNING SYSTEM AND FOUND NO FAULTS. GROUND RUNS AT VARIOUS POWER SETTINGS WERE PERFORMED AND WERE SATISFACTORY. AIRCRAFT WAS RETURNED TO SERVICE FOR THE FLIGHT BACK TO PANC. ON THE FLIGHT BACK TO PANC, THE #1 LIGHT ILLUMINATED BRIEFLY A COUPLE MORE TIMES ON THE DESCENT INTO PANC WITH NORMAL INDICATIONS ON ENG PARAMETERS AGAIN. MAINTENANCE IN PANC PERFORMED A THOROUGH INSPECTION OF ALL LOOPS AND TEST CIRCUITS. ALL CHECKED GOOD. MAINT THEN PHYSICALLY INSPECTED ALL LOOPS FOR HIDDEN DAMAGE AND FOUND THE TAIL CONE LOOP WAS TOUCHING THE EXHAUST CASING WITH SLIGHT RUBBING NOTED. TAIL CONE LOOP WAS REPLACED WITH NEW AND GROUND AND FLIGHT CHECKS WERE SATISFACTORY. AIRCRAFT WAS RETURNED TO SERVICE. NOTE: SDR FILED LATE AS ACCOUNT WAS LOCKED OUT.
MAINT WAS NOTIFIED THAT THE RH MAIN TIRES WERE BLOWN ON THE TAKE OFF ROLL ON RUNWAY 33. THE CREW ABORTED TAKEOFF AND STOPPED THE AIRCRAFT ON THE RUNWAY. AT THIS POINT THE CREW SHUT DOWN THE AIRCRAFT TO INSPECT THE WHEELS. IT WAS NOTED THAT BOTH TIRES WERE BLOWN AND THE RIMS AND BRAKES HAD BEEN WORN DOWN BY CONTACT WITH THE RUNWAY. MAINTENANCE JACKED THE AIRCRAFT ON THE RUNWAY, PULLED THE DAMAGED WHEELS AND BRAKES FROM THE AXLE, DID A PRELIMINARY INSPECTION OF THE GEAR AREA, AND INSTALLED BRAKES AND WHEELS FROM STOCK. AIRCRAFT WAS THEN REPOSITIONED TO THE HANGAR BY MEANS OF TOWING. ALL OF THE DAMAGED MATERIALS FROM THIS ISSUE WERE COLLECTED FROM THE RUNWAY. CAUSE OF THE TIRES BLOWING APPEARS TO BE FROM ONE OF THE TIRES SHEDDING ITS ENTIRE TREAD, AS IT WAS LOCATED ON THE RUNWAY ALL IN ONE PIECE NEAR THE START OF THE TAKEOFF ROLL. LOSS OF THE ONE TIRE AND RIDING ON THE REMAINING SINGLE TIRE WITH A FULL LOAD OF FUEL MOST LIKELY CAUSED THE SECOND TIRE TO BLOW. MAINTENANCE DOES A WALK AROUND AFTER EACH FLIGHT AS WELL AS THE FLIGHT CREW DOING THEIR PREFLIGHT NOTED NO ISSUES WITH THE TIRES. THE REMAINING TREAD ON ALL OF THE TIRE PIECES COLLECTED SHOW QUITE A BIT OF TREAD LEFT. ONCE IN MAINTENANCE, THE AIRCRAFT WAS PUT ON JACKS AND WE THOROUGHLY INSPECTED THE AIRCRAFT. THE MAIN INSPECTION CRITERIA USED FOR THE INSPECTION WAS THE HIGH ENERGY STOP (REJECTED TAKEOFF) DUE TO THE FACT THAT THE AIRCRAFT WAS FULL OF FUEL AND STOPPING POWER WAS GREATER THAN USUAL. WE ALSO USED SOME OF THE CRITERIA FROM THE HARD LANDING AND OVERWEIGHT LANDING INSPECTIONS, BUT THIS WAS JUST TO GO THE EXTRA MILE AS THE AIRCRAFT NEVER LEFT THE GROUND OR VEERED OFF THE RUNWAY. THESE INSPECTIONS INCLUDED DETAILED INSPECTIONS OF THE WING SURFACE, MAIN LANDING GEAR TRUNNION ATTACH POINTS, AND GEAR AS A WHOLE. IT ALSO INCLUDES DETAILED INSPECTION ON ALL OF THE MAIN LANDING GEAR WHEELS AND DISPOSAL OF ALL TIRES. ALL OF THE MAIN WHEELS/TIRES, BRAKE ASSEMBLIES, AND TIE BOLTS WERE REPLACED WITH OVERHAULED AND SERVICEABLE UNITS. NO STRUCTURAL DAMAGE WAS NOTED TO THE WINGS OR MAIN LANDING GEAR MOUNTING STRUCTURE AS WE HAD SUSPECTED. WE DID HAVE A FEW ITEMS THAT WERE DAMAGED WHEN THE TIRES FRAGMENTED. THE RH FLAP HAD DAMAGE BEYOND LIMITS IN THE RAISBECK AMM, SO IT WAS REPLACED WITH A SERVICEABLE FLAP. THE RH MAIN LANDING GEAR OUTBOARD DOOR ALONG WITH ITS HINGE AND ATTACHING LINKAGE WAS DAMAGED AND WAS REPLACED WITH A SERVICEABLE UNIT. THE ANTI SKID WIRING WAS PULLED OUT OF THE TRANSDUCERS ON THE RH GEAR AS WELL. THE WIRES ALSO WERE DAMAGED IN A COUPLE AREAS ON THE BACK SIDE OF THE MAIN GEAR STRUT WHERE IMPACT FROM THE TIRE WAS NOTED. THESE WIRES WERE REPLACED FROM THE TRANSDUCERS TO THE ANTI SKID VALVES. ALL SYSTEMS CHECK GOOD ONCE BACK TOGETHER. AIRCRAFT WAS RETURNED TO SERVICE.
MAINT WAS NOTIFIED THAT THE RH MAIN TIRES WERE BLOWN ON THE TAKE OFF ROLL ON RUNWAY 33. THE CREW ABORTED TAKEOFF AND STOPPED THE AIRCRAFT ON THE RUNWAY. AT THIS POINT THE CREW SHUT DOWN THE AIRCRAFT TO INSPECT THE WHEELS. IT WAS NOTED THAT BOTH TIRES WERE BLOWN AND THE RIMS AND BRAKES HAD BEEN WORN DOWN BY CONTACT WITH THE RUNWAY. MAINTENANCE JACKED THE AIRCRAFT ON THE RUNWAY, PULLED THE DAMAGED WHEELS AND BRAKES FROM THE AXLE, DID A PRELIMINARY INSPECTION OF THE GEAR AREA, AND INSTALLED BRAKES AND WHEELS FROM STOCK. AIRCRAFT WAS THEN REPOSITIONED TO THE HANGAR BY MEANS OF TOWING. ALL OF THE DAMAGED MATERIALS FROM THIS ISSUE WERE COLLECTED FROM THE RUNWAY. CAUSE OF THE TIRES BLOWING APPEARS TO BE FROM ONE OF THE TIRES SHEDDING ITS ENTIRE TREAD, AS IT WAS LOCATED ON THE RUNWAY ALL IN ONE PIECE NEAR THE START OF THE TAKEOFF ROLL. LOSS OF THE ONE TIRE AND RIDING ON THE REMAINING SINGLE TIRE WITH A FULL LOAD OF FUEL MOST LIKELY CAUSED THE SECOND TIRE TO BLOW. MAINTENANCE DOES A WALK AROUND AFTER EACH FLIGHT AS WELL AS THE FLIGHT CREW DOING THEIR PREFLIGHT NOTED NO ISSUES WITH THE TIRES. THE REMAINING TREAD ON ALL OF THE TIRE PIECES COLLECTED SHOW QUITE A BIT OF TREAD LEFT. ONCE IN MAINTENANCE, THE AIRCRAFT WAS PUT ON JACKS AND WE THOROUGHLY INSPECTED THE AIRCRAFT. THE MAIN INSPECTION CRITERIA USED FOR THE INSPECTION WAS THE HIGH ENERGY STOP (REJECTED TAKEOFF) DUE TO THE FACT THAT THE AIRCRAFT WAS FULL OF FUEL AND STOPPING POWER WAS GREATER THAN USUAL. WE ALSO USED SOME OF THE CRITERIA FROM THE HARD LANDING AND OVERWEIGHT LANDING INSPECTIONS, BUT THIS WAS JUST TO GO THE EXTRA MILE AS THE AIRCRAFT NEVER LEFT THE GROUND OR VEERED OFF THE RUNWAY. THESE INSPECTIONS INCLUDED DETAILED INSPECTIONS OF THE WING SURFACE, MAIN LANDING GEAR TRUNNION ATTACH POINTS, AND GEAR AS A WHOLE. IT ALSO INCLUDES DETAILED INSPECTION ON ALL OF THE MAIN LANDING GEAR WHEELS AND DISPOSAL OF ALL TIRES. ALL OF THE MAIN WHEELS/TIRES, BRAKE ASSEMBLIES, AND TIE BOLTS WERE REPLACED WITH OVERHAULED AND SERVICEABLE UNITS. NO STRUCTURAL DAMAGE WAS NOTED TO THE WINGS OR MAIN LANDING GEAR MOUNTING STRUCTURE AS WE HAD SUSPECTED. WE DID HAVE A FEW ITEMS THAT WERE DAMAGED WHEN THE TIRES FRAGMENTED. THE RH FLAP HAD DAMAGE BEYOND LIMITS IN THE RAISBECK AMM, SO IT WAS REPLACED WITH A SERVICEABLE FLAP. THE RH MAIN LANDING GEAR OUTBOARD DOOR ALONG WITH ITS HINGE AND ATTACHING LINKAGE WAS DAMAGED AND WAS REPLACED WITH A SERVICEABLE UNIT. THE ANTI SKID WIRING WAS PULLED OUT OF THE TRANSDUCERS ON THE RH GEAR AS WELL. THE WIRES ALSO WERE DAMAGED IN A COUPLE AREAS ON THE BACK SIDE OF THE MAIN GEAR STRUT WHERE IMPACT FROM THE TIRE WAS NOTED. THESE WIRES WERE REPLACED FROM THE TRANSDUCERS TO THE ANTI SKID VALVES. ALL SYSTEMS CHECK GOOD ONCE BACK TOGETHER. AIRCRAFT WAS RETURNED TO SERVICE.
ENROUTE. TOP OF CLIMB, 20 MINS INTO FLT, PERSONNEL IN THE AFT SEAT NOTED AN ACRID SMELL IN CABIN. ABORTED MISSION & RETURNED TO DEPARTURE UNEVENTFULLY. CREW STATED THAT SMELL WAS ACRID, BUT UNABLE TO DETERMINE ELECTRICAL OR HEAT RELATED. FLT CREW STATED HAD A FAINT SMELL OF SOMETHING AFTER BEING ALERTED BY THE MED CREW IN REAR OF AIRCRAFT. ELECTRICAL SYSTEMS WERE RUN FOR APPROX 15 MINS FOR ANY ELECTRICAL FAILURES. SYSTEMS CHECKED, NO ELECTRICAL FAULTS WERE NOTED. MAINT RAN AIRCRAFT WITH INTERIOR REMOVED AT FULL POWER FOR 5 MINS, THEN 75% POWER FOR 10 MINS CHECKED FOR BLEED AIR ISSUES. DONE WITH NAC HEAT & WING/STAB HEAT ON. NO NOTED ACRID SMELLS. AIRCRAFT RETURNED TO SERVICE & MAINTENANCE CHECK FLT PERFORMED FOR 45 MINUTES. NO SMELLS OF ANY ACRID NATURE PRESENT. ONLY SMELLS WERE NORMAL HOT DUCTING WITH HEAT TURNED UP & WING/STAB HEAT ON, AT TOP OF CLIMB. FLT CREW CONFIRMED THIS WAS LIKE THE FAINT SMELL WHEN ALERTED BY MED CREW. AIRCRAFT MAINTENANCE CHECK FLT CLEARED & AIRCRAFT WAS RETURNED TO SERVICE. NO BLEED AIR OR ELECTRICAL ISSUES ARE PRESENT WITH THE AIRCRAFT.
ON A MISSION FROM FAI-HOM, DURING CRUISE, MEDICAL CREW IN AFT OF AIRCRAFT REPORTED SMELL OF ACRID SMOKE. FIGHT WAS DIVERTED TO ANC. MAINTENANCE CHECKED OUT ELECTRICAL SYSTEMS IN AIRCRAFT DUE TO NATURE OF STATED SMELL. THE ONLY SMELL NOTED DURING CHECKS WAS THE CABIN AUX HEATER. SYSTEM WAS RUN FOR ABOUT 10 MINUTES IN HANGAR AND NO FAULTS WERE FOUND. PERFORMED GROUND RUNS TO ENSURE NO BLEED AIR LEAKS WERE PRESENT, AND ALL CHECKED GOOD. AIRCRAFT WAS RELEASED FROM MAINTENANCE AND TAKEN ON A CHECK FLIGHT THAT PRODUCED SATISFACTORY RESULTS. NO SMOKE OR ACRID SMELL WAS PRESENT. AIRCRAFT WAS RETURNED TO SERVICE.
ON A FLIGHT FROM BET TO ANC, WE LEVELED OFF AT FL350 AND WERE CRUISING AT APPOX .73 MACH WHEN THE RED SPOILER LIGHT ILLUMINATED ON THE WARNING PANEL ALONG WITH THE MASTER WARNING. THE AIRCRAFT ROLLED SHARPLY TO THE RIGHT AS IF THE RIGHT SPOILER DEPLOYED UN-COMMANDED. THE SPOILER SWITCH WAS IN THE RETRACT POSITION. THE FP DISENGAGED THE AP, LEVELED WINGS AND RE-TRIMMED AC. ONCE WINGS WERE LEVEL, RIGHT SPOILER RETRACTED(RED SPOILER WARNING LIGHT EXTINGUISHED) CAUSING A ROLL IN OPPOSITE DIRECTION. FP ONCE AGAIN LEVELED WINGS AND RE-TRIMMED AC FOR LEVEL FLIGHT. AP WAS RE-ENGAGED. SPOILER CB WAS PULLED TO PREVENT ANOTHER UNCOMMANDED DEPLOYMENT. ON FINAL, WHEN FLAPS WERE LOWERED TO FULL AT 145 KNOTS, THE RED SPOILER LIGHT ON THE WARNING PANEL ILLUMINATED ALONG WITH MASTER WARNING LIGHT. NO ROLLING MOTION WAS DETECTED. THE PLANE LANDED SAFELY WITH NO FURTHER INCIDENT. AIRCRAFT WAS PULLED INTO MAINT HANGAR AND WE ARE CURRENTLY IN THE PROCESS OF TROUBLESHOOTING THE SYSTEM. RUNNING THRU THE CHECKS OF ASSOCIATED SYSTEMS AND WILL SUBMIT A FOLLOW UP TO THIS SDR UPON FURTHER INVESTIGATION.
RT MAIN TIRES BLOWN ON THE TAKE OFF ROLL ON RUNWAY 33. ABORTED TAKEOFF AND STOPPED ON THE RUNWAY. SHUT DOWN THE AIRCRAFT TO INSPECT THE WHEELS. IT WAS NOTED THAT BOTH TIRES WERE BLOWN AND THE RIMS AND BRAKES HAD BEEN WORN DOWN BY CONTACT WITH THE RUNWAY. MX JACKED THE AIRCRAFT ON THE RUNWAY, PULLED THE DAMAGED WHEELS AND BRAKES FROM THE AXLE, DID A PRELIMINARY INSPECTION OF THE GEAR AREA, AND INSTALLED BRAKES AND WHEELS FROM STOCK. CAUSE OF THE TIRES BLOWING APPEARS TO BE FROM ONE OF THE TIRES SHEDDING ITS ENTIRE TREAD, AS IT WAS LOCATED ON THE RUNWAY ALL IN ONE PIECE NEAR THE START OF THE TAKEOFF ROLL. LOSS OF THE ONE TIRE AND RIDING ON THE REMAINING SINGLE TIRE WITH A FULL LOAD OF FUEL MOST LIKELY CAUSED THE SECOND TIRE TO BLOW.
ON APPROACH, THE NR 1 FIRE LIGHT ILLUMINATED AGAIN. WHEN THROTTLE WAS PULLED TO IDLE, THE LIGHT EXTINGUISHED. ENG COMPARTMENT WAS INSPECTED FOR SIGNS OF FIRE & NONE WAS NOTED. THIS IS AN ONGOING INTERMITTENT ISSUE. WIRING, BLEED LINES, FIRE LOOPS HAVE BEEN CHECKED WITH NO FAULTS NOTED. A GND RUN DUPLICATED THE ISSUE FOR ABOUT TWO SECONDS DURING START. LIGHT THEN WENT OUT & WE WERE UNABLE TO DUPLICATE AGAIN. TROUBLESHOOTING CONTINUES. A FOLLOW UP REPORT WILL BE FILED USING THIS SAME CONTROL NUMBER.
ON APPROACH, THE NR 1 ENG FIRE WARNING LIGHT CAME ON. POWER WAS RETARDED TO IDLE & THE LIGHT WENT OUT, FOUND BLEED AIR SUPPLY TUBE CRACKED AT NAC HEAT CONNECTION, FOUND LEAK FROM WHERE THE LP BLEED AIR SUPPLY TUBE MEETS THE PRSOV VLV, & FOUND THE BLEED AIR SUPPLY TUBE IN THE LT PYLON LEAKING AROUND BOTH CONNECTIONS. REMOVED CRACKED LT BLEED AIR SUPPLY TUBE & INSTALLED SERVICEABLE TUBE ASSEMBLY PN ON & OFF 2655101-87, USING NEW GASKETS, PN 6050001-12 & 6600335-3 QTY 1 EA. REMOVED WORN C SEAL FROM LP TUBE ASSEMBLY AT THE PRSOV & INSTALLED NEW PN ON & OFF 612-A51-0038-2 QTY 1 EA. REMOVED WORN O RING SEALS FROM THE LT PYLON BLEED AIR SUPPLY TUBE WIGGINGS FITTINGS & INSTALLED NEW PN ON & OFF M83248 1-218 QTY 4 EA. ALL WORK DONE IAW AMM STANDARD PRACTICES. LEAK & OPS CHECKED OK. ACFT WAS RTS.
NR 1 ENGINE FIRE LIGHT ILLUMINATED IN FLIGHT. UPON DECENT, LEVELING OFF AT APPROXIMATELY 13,000 FT, THE NR 1 ENGINE FIRE LIGHT CAME ON SHORTLY AFTER TURNING ON THE NAC HEAT. THE CREW FOLLOWED THE EMERGENCY PROCEDURES. POWER WAS RETARDED TO IDLE AND THE LIGHT REMAINED ON. NO OTHER INDICATIONS OF FIRE EXISTED. THE CREW THEN SHUTDOWN THE NR 1 ENGINE AND THE LIGHT REMAINED ON. THE FIRST FIRE BOTTLE WAS THEN DISCHARGED INTO THE NR 1 ENGINE COMPARTMENT AND THE LIGHT REMAINED ON. ATC WAS ALERTED OF AN EMERGENCY AND FIRE TRUCKS WERE DISPATCHED. THE SECOND FIRE BOTTLE WAS THEN DISCHARGED WITH NO CHANGE TO THE LIGHT. THE ACFT LANDED WITHOUT INCIDENT AND THE LIGHT EXTINGUISHED ON ROLLOUT. FIRE CREWS CONFIRMED N
LEFT ENG FIRE LIGHT ON HANDLE ILLUMINATED FOR ABOUT 10 SECONDS DURING DECENT. ENG WAS ALREADY AT IDLE & LIGHT EXTINGUISHED. THERE WERE NO OTHER SIGNS OF FIRE NOTED BY THE CREW. OPENED THE COWLINGS & CHECKED FOR SIGNS OF A FIRE & FOUND NONE. WIRING IN THE FIRE DETECTION TEST SYS CHECKED OUT GOOD. RESISTANCE CHECK OF ALL THREE FIRE LOOPS WERE GOOD. THE AFT TAILPIPE FIRE LOOP FAILED ITS INSULATION CHECK. THE DEFECTIVE UNIT WAS REMOVED, PN 744-07235, SN 094108 & A NEW LOOP INSTALLED, PN 744-07235 & SN 152308. CHECK OF THE FIRE LOOP SYS CHECKED GOOD. RETURNED THE ACFT TO AIRWORTHY CONDITION & PERFORMED A SATISFACTORY CHECK FLIGHT. OK FOR SERVICE.
LEFT ENG FIRE LIGHT ILLUMINATED ON DECENT FOR ABOUT 20 SECONDS. THROTTLES WERE ALREADY RETARDED & LIGHT EXTINGUISHED. INSPECTED ENG & FOUND NO INDICATIONS OF FIRE. THE FIRE LOOPS WERE INSPECTED FOR CHAFING & CONTINUITY. MX WAS UNABLE TO DUPLICATE THE ISSUE ON THE GND. ACFT RTS.
ON DESCENT, MASTER CAUTION & FIRE LIGHT ILLUMINATED ON LT ENG. THERE WERE NO OTHER FIRE INDICATIONS. ENG WAS BROUGHT TO IDLE & SHUTDOWN USING ENG SHUTDOWN CHECKLIST. A CRACKED HIGH PRESS BLEED AIR LINE WAS DISCOVERED ON THE LT ENG. THE CRACK WAS ON THE JUNCTION FROM THE MOD VLV TO THE NAC HEAT WELD & EXTENDED APPROX 3/4 OF AN INCH PAST THE WELD. REPLACED THE LINE WITH A SERVICEABLE UNIT. OPERATIONAL GND RUN & CHECK FLIGHT TESTS PASSED. ACFT WAS RETURNED TO SERVICE.
WE EXPERIENCED A FIRE WARNING INDICATION ON THE LT ENGINE IN 543 ON OUR DESCENT. THIS OCCURRED ABOUT 2330 LOCAL TIME. WE WERE AT FLIGHT IDLE AND DESCENDING THROUGH 13000 FEET WHEN THE LT ENGINE FIRE WARNING SYS ACTIVATED. WE HAD BEEN AT FLIGHT IDLE FOR OVER A MINUTE AT THIS POINT, HOWEVER, WE FOLLOWED THE MEMORY ITEMS FOR THIS EVENT. AFTER 15 SECONDS WE MOVED THE LT THROTTLE TO CUTOFF. NEXT WE PULLED THE FIRE T-HANDLE. AFTER PULLING THE T-HANDLE WE NOTED THAT THE 2 ARM LIGHTS FOR THE FIRE BOTTLES DID NOT ILLUMINATE. THE FLYING PILOT, PUSHED THE LT ARM LIGHT AND THE FIRE INDICATION STILL DID NOT EXTINGUISH. DECLARED AN EMERGENCY AND ASKED FOR THE THE FIRE TRUCKS TO BE STANDING BY. AT THIS TIME WE WERE GETTING PRETTY CLOSE TO THE AIRPORT SO WE FINISHED THE EMERGENCY CHECKLIST AND PREPARED THE ACFT FOR LANDING. ABOUT 2 MINUTES AFTER DECLARING THE EMERGENCY THE FIRE INDICATION DID EXTINGUISH. WE LANDED WITHOUT INCIDENT. AFTER LANDING IT WAS DETERMINED THAT WE HAD A FALSE INDICATION AND THAT THERE WAS NO FIRE.
RETURNING WITH A PATIENT ON BOARD, RECEIVED A FIRE LIGHT ON NR 1 ENGINE DESCENDING THROUGH FL370 FROM OUR CRUISE ALTITUDE OF FL390. THE F/O WAS FLYING AND PILOT ACCOMPLISHED THE REQUIRED ITEMS FOR AN ENGINE FIRE. FIRELIGHT DID NOT GO OUT UNTIL 3 TO 4 MINUTES AFTER SECOND FIRE BOTTLE WAS DISCHARGED. ACFT WAS APPROX 15,000 FT AT THIS TIME. DECLARED AN EMERGENCY, READ EMERGENCY CHECKLIST. MADE THE SINGLE ENGINE LANDING. ENGINE INSPECTED BY GROUND MX AND THERE WAS NO INDICATION OF AN ACTUAL FIRE. TROUBLESHOOTING HAS IDENTIFIED A FAULYT FIRE LOOP SEGMENT ON THE LT ENGINE. WORK IS IN PROGRESS TO IDENTIFY WHICH PORTION OF THE FIRE LOOP IS AT FAULT AND WILL THEN BE REPLACED.