Service difficulty report · Battery · Boeing 74744AF

Difficulty date
August 2, 2026
Submitted
August 6, 2026
Operation
Air carrier
Aircraft
N572UP
Make and model
Boeing 74744AF
Aircraft serial
35669
Aircraft time
65,192 hours, 10,331 cycles
Part
Battery
Part number
AD20131A
Part serial
90080
Condition
Inoperative
Location
Zone 200
Stage of operation
IN
How discovered
V
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

FOUND THE UPPER DECK AISLE EMERGENCY LIGHT INOP. IAW SSM 33-51-01 REV.47 PERFORMED THE UPPER DECK AISLE EMERGENCY LIGHT SYSTEM CHECK , FOUND THE EMERGENCY LIGHT BATTERY M5168 FUNCTION FAIL. IAW AMM 33-51-04-902-001-001, REV.117. REPLACED THE EMERGENCY LIGHT BATTERY M5168 AND PERFORMED UPPER DECK EMERGENCY LIGHT TEST, RESULT WAS SATISFACTORY.

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