What was found
UPPER DECK EMER LIGHT POWER SUPPLY M5056 NOT OPERATE. REPLACED UPPER DECK EMER LIGHT POWER SUPPLY (M5056) AND EMER LIGHT CHECK NORMAL AND THEN POWER SUPPLY TEST SWITCH CHECK NORMAL PER AMM 33-51-04-11 ITEM 345.
- Difficulty date
- October 20, 2026
- Submitted
- October 24, 2026
- Operation
- Air carrier
- Aircraft
- N919CA
- Make and model
- Boeing 747428
- Aircraft serial
- 25302
- Aircraft time
- 119,245 hours, 17,955 cycles
- Engine
- Ge CF680C2B1F
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Power Supply
- Part number
- BPS73
- Part serial
- 20841
- Condition
- Faulted
- 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.