Service difficulty report · Fire Detector · Raythn 390

Difficulty date
May 22, 2026
Submitted
May 26, 2026
Operation
Air carrier
Aircraft
N189K
Make and model
Raythn 390
Aircraft serial
RB248
Aircraft time
3,507 hours, 4,101 cycles
Part
Fire Detector
Part number
47790005
Part serial
0725177
Condition
False Activation
Location
Zone 400
Part time
3,507 hours, 4,101 cycles
Stage of operation
CR
How discovered
O
Nature of condition
N
Precautionary procedure
E

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

WHILE CRUISING AT 38,000 FEET IN AND OUT OF CLOUDS NO PRECIPITATION OR TURBULENCE. RIGHT ENGINE FIRE INDICATION PUSH BUTTON ILLUMINATED AND "FIRE" ANNUNCIATOR IN THE N1 INDICATION CAME ON. THE FLIGHT CREW PERFORMED MEMORY ITEMS OF: THROTTLE TO IDLE AND WAIT FOR THE LIGHTS TO EXTINGUISH - THEY DID NOT. THE CREW MOVED THE THROTTLE TO CUT OFF AND THE LIGHTS EXTINGUISHED. COMMUNICATED TO CENTER THEY WANTED TO START A DECENT AND CHANGED THEIR ARRIVAL AIRPORT FROM 27K TO KLEX FOR GROUND AND SAFETY SUPPORT REASONS. THE ARM BUTTON WAS PRESSED THAT TURNED FUEL AND HYDRAULICS OFF AND ARMED THE SQUIB IF THEY NEEDED TO BLOW THE BOTTLE. FIRE BOTTLE WAS NOT BLOWN AS THE FIRE INDICATION WAS NO LONGER PRESENT. RIGHT ENGINE REMAINED SHUT DOWN FOR THE REMAINDER OF THE FLIGHT. THE CREW RAN THE "ONE ENGINE INOPERATIVE" APPROACH CHECK LIST IN ITS ENTIRETY. LANDED AT KLEX AND WAS ALERTED THAT BOTH ENGINES SEEMED NORMAL. FIRE CAME TO THE AIRCRAFT TO PERFORM THERMAL SCANNING AND A VISUAL INSPECTION WITH NO INDICATIONS OF A CURRENT OR HISTORY OF FIRE TAKING PLACE. WE BELIEVE THIS TO BE A FALSE FIRE INDICATION.