What was found
DURING PRE FLIGHT, THE EMERGENCY LIGHTS WERE TESTED. THE LIGHTS REMAINED ON IN THE ARM POSITION. VERIFIED EMER LIGHTS STAY ON WITH EMER LT SWITCH IN ARM POSITION. AFTER TROUBLSHOOTING FOUND AFT EMERGENCY BATTERY IS INOP. REMOVED AFT EMERGENCY BATTERY PN#7450LS-00 SN# 007398 IAW PHENOM 300 AMM 33-52-01-000-801-A INSTALLED 'REPAIRED' AFT EMERGENCY BATTERY PN#450LS-00 SN# 007015 (LAST F/T PERFORMED JU/10/2026 REF EEJS WO# W26689) IAW PHENOM 300 AMM 33-52-01-400-801-A. PERFORMED SATISFACTORY BATTERY OPS TEST OF EMERGENCY BATTERY IAW AMM 33-52-01-710-801-A. PERFORMED SATISFACTORY OPS TEST OF THE EMERGENCY LIGHTS IAW AMM 33-52-00-710-801-A.