Service difficulty report · Fire Loop · Doug DC871F

Difficulty date
May 28, 2008
Submitted
June 3, 2008
Operation
Air carrier
Aircraft
N820BX
Make and model
Doug DC871F
Aircraft serial
46065
Aircraft time
90,489 hours, 37,577 cycles
Part
Fire Loop
Condition
Intermittent
Location
Nr Engine
Part time
90,489 hours, 37,577 cycles
Stage of operation
CR
How discovered
O
Nature of condition
N
Precautionary procedure
F, A

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

What was found

DURING CRUISE FROM KSJC TO KRFD NUMBER ONE ENGINE FIRE INDICATION AT FL 350 WITH FIRE WARNING LIGHT ON. AFTER SILENCING THE BELL THE CREW DISCHARGED THE FIRE AGENT, AFTER THIRTY SECONDS THE FIRE LIGHT REMAINED ON AND THE CREW DISCHARGED THE SECOND BOTTLE AND THE FIRE LIGHT WENT OUT. THE FIRE LIGHT CAME BACK ON AT FL 096 AND REMAINED ILLUMINATED. THE CREW LANDED AT KRNO WITHOUT INCIDENT. MAINTENANCE INSPECTED NUMBER ONE ENGINE AND FOUND NO EVIDENCE OF FIRE, MAINTENANCE DID FIND RIGHT FAN CASE LOOP WOULD DROP FROM 2.M OHMS INTO K OHMS INTERMITTENTLY CENTER PIN TO GROUND. MAINTENANCE REPLACED RIGHT FAN CASE LOOP, LEFT FAN CASE LOOP, UPPER PYLON LOOP, AND NUMBER ONE ENGINE FIRE DETECTOR. OPERATIONAL CHECK GOOD IAW W/D 26-01-01, ERH 70.1. AIRCRAFT RETURNED TO SERVICE.

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