Faa A320 MMEL
FYI:
40-02
Landing Lights (installed) 2 (required)1 Notes: One may be inoperative provided nose, taxi and takeoff lights operate normally.
May be inoperative for day operations.
Retraction Systems (installed) 2 (required) 0 Notes:(O) May be inoperative provided a 1% fuel penalty is applied for each extended light.