Text in force at CS29-12: from CS29-0, effective 14 Nov 2003.
(a) Each ri ding l ight required for water operation must be installed so that it can:
(1) Show a white light for at least 4 km (two m iles) at ni ght under cl ear atmospheric conditions; and
(2) Show a m aximum pract icable unbroken light with the rotorcraft on the water.
(b) Externally hung lights may be used.
ED Decision 2003/016/RM · Source