Service difficulty report · Pcb · Textrn TEXTRON700

Difficulty date
May 26, 2025
Submitted
May 28, 2025
Operation
Air carrier
Aircraft
N878QS
Make and model
Textrn TEXTRON700
Aircraft serial
7000135
Aircraft time
80 hours, 44 cycles
Part
Pcb
Condition
Faulted
Location
Fire Detection
Stage of operation
TX
How discovered
O
Nature of condition
N
Precautionary procedure
O

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

What was found

UPON CLEARING RUNWAY AFTER LANDING, RECIEVED A RT ENG FIRE CAS MSG. STOPPED ACFT TO PERFORM QRC THE CAS MSG CLEARED (ON FOR LESS THAN 10 SECONDS) & WE THEN RECIEVED A RIGHT ENG DET FAIL CAS. THAT MSG REMAINED LESS THAN 5-10 SECONDS AND EXTINGUISHED. NO OTHER MSG'S APPEARED AND NO OTHER ENGINE INDICATION OF AN ENGINE FIRE EXISTED. REPEAT WRITE UP. POWERED UP AIRCRAFT AND FOUND NO FIRE CAS MESSAGES PRESENT BUT FOUND EVENT IN FAULT HISTORY. DOWNLOADED AND ANALYZED ARES DATA. FOUND RH FIRE PROTECTION PCB MOMENTARILY THROWING SHORT MESSAGE BUT NO FAULTS FROM FIRE LOOPS. GAINED ACCESS TO RH ENGINE FIRE LOOPS AND WIRING, INSPECTED FOR DAMAGE AND ROUTING, NO DEFECTS NOTED. RANG OUT WIRING FROM FIRE LOOP CONNECTIONS TO RT FIRE PROTECTION PCB WHILE FLEXING WIRING AT SOLDER SLEEVES AND BEND POINTS IAW WIRE DIAGRAM MANUAL CH.26-10-01, NO DEFECTS NOTED. REPOSITIONED LH AND RH FIRE PROTECTION PCBS TO OPPOSITE SIDES. REMOVED LH PCB PN:7468182-1 SN:34204479-1 AND INSTALLED SERVICEABLE PCB PN:7468182-1 SN:34204479-4 IAW CESSNA 700 MM 24-60-01, OPS CHKD GOOD.