What was found
DFW - DURING PRE-FLIGHT, PILOT REPORTED EMERGENCY LIGHTS DID NOT WORK WITHOUT GROUND POWER. MAINTENANCE FOUND ALL FOUR EMERGENCY LIGHT POWER SUPPLY UNITS DID NOT HAVE BATTERY PACKS INSTALLED. BATTERY PACKS WERE INSTALLED INTO THE POWER SUPPLY UNITS 61WL, 43WL, 73WL, AND 62WL. OPS CHECK WAS GOOD AND AIRCRAFT WAS RETURNED TO SERVICE. (M)