Service difficulty report · Battery Pack · Boeing 777222

Difficulty date
December 8, 2025
Submitted
December 9, 2025
Operation
Air carrier
Aircraft
N798UA
Make and model
Boeing 777222
Aircraft serial
26928
Aircraft time
112,203 hours, 14,848 cycles
Part
Battery Pack
Part number
D71701100
Condition
Discharged
Location
Zone 200
Stage of operation
IN
How discovered
C
Nature of condition
L
Precautionary procedure
K

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

What was found

M/D L3 DOOR AFT EMERGENCY LIGHT POWER SUPPLY M33401 BATTERY PACK FOUND LOW CAPACITY. RAISED FROM TASK CARD 86-3350-1-0002. REPLACED M/D L3 DOOR AFT EMERGENCY LIGHT POWER SUPPLY M33401 BATTERY PACK AND PERFORMED NEW BATTERY PACK INSTALLATION TEST & CAPACITY CHECK. THE RESULT NORMAL IAW AMM 33-51-06-960-802 & AMM 33-51-06-200-801 REV.105. L3 DOOR AFT EMERGENCY LIGHT POWER SUPPLY M33601 BATTERY PACK FOUND LOW CAPACITY. REPLACED THE BATTERY PACK. CAPACITY TEST NORMAL CHECKED. REPLACED M/D L3 DOOR AFT EMERGENCY LIGHT POWER SUPPLY M33401 BATTERY PACK AND PERFORMED NEW BATTERY PACK INSTALLATION TEST & CAPACITY CHECK. THE RESULT NORMAL AS PER AMM 33-51-06-960-802 & AMM 33-51-06-200-801, REV 105.