Service difficulty report · Circuit Card · Boeing 747481

Difficulty date
June 7, 2019
Submitted
June 7, 2019
Operation
Air carrier
Aircraft
N322SG
Make and model
Boeing 747481
Aircraft serial
30322
Aircraft time
45,914 hours, 6,019 cycles
Part
Circuit Card
Part number
644501
Part serial
16921
Condition
Malfunctioned
Location
Fire Loop
Stage of operation
IN
How discovered
9
Nature of condition
O
Precautionary procedure
K

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

What was found

EXISTING FAULT, ENG 1 FIRE LOOP B.(<P>REPLACED ENG 1 FIRE LOOP B CIRCUIT CARD I.A.W. AMM 26-10-01-004-001 & 26-10-01-404-006 REV. 95. PERFORMED FIRE DETECTION CIRCUIT TEST (ENG 1 FIRE LOOP B), THE RESULT WAS SATISFACTORY I.A.W. AMM 26-10-01-404-006 REV. 95. PERFORMED ENGINE FIRE DETECTION AFOLTS CARD INSTALLATION TEST AND THE RESULT WAS SATISFACTORY I.A.W. AMM 26-10-01-404-006 REV. 95 STEP E.</P>)