SDR ASAA2026011363744

Service difficulty report · Battery Pack · Boeing 737890

Difficulty date: January 13, 2026
Submitted: January 14, 2026
Operation: Air carrier
Aircraft: N517AS
Make and model: Boeing 737890
Aircraft serial: 35197
Aircraft time: 60,178 hours, 18,001 cycles
System (JASC): 3350 · Emergency Lighting
Part: Battery Pack
Part number: ADD71701100
Condition: No Test
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

WHILE PERFORMING T.C. #78233001, BATT PACKS FAILED EMERGENCY LIGHTS FUNC TEST. GROUNDED - YES. REMOVED AND REPLACED BATT PACKS X3 AT L1, R2, AND LH AFT MID CABIN POS, IAW AMM 33-51-06-960-805. NEW UNITS FROM STOCK CHECKS GOOD. ALSO, RELAMPED FWD AND AFT GALLEY ENTRY OVERHEAD EMERG LT IAW AMM 33-51-03-960-801. NEW LAMP X2, CHECKS GOOD.