14 CFR 91.209 : Aeronautics And Space (§ 1.1 To Parts 1311-1399) — (§ 60.1 To Parts 108-109) — Federal Aviation Administration, Department Of Transportation (Continued) (§ 60.1 To Parts 108-109) — Air Traffic And General Operating Rules (§ 91.1 To Parts 108-109) — General Operating And Flight Rules (§ 91.1 To Appendix G To Part 91) — Equipment, Instrument, And Certificate Requirements (§ 91.201 To §§ 91.228-91.299) — Aircraft lights.

No person may:

(a) During the period from sunset to sunrise (or, in Alaska, during the period a prominent unlighted object cannot be seen from a distance of 3 statute miles or the sun is more than 6 degrees below the horizon) -

(1) Operate an aircraft unless it has lighted position lights;

(2) Park or move an aircraft in, or in dangerous proximity to, a night flight operations area of an airport unless the aircraft -

(i) Is clearly illuminated;

(ii) Has lighted position lights; or

(iii) is in an area that is marked by obstruction lights;

(3) Anchor an aircraft unless the aircraft -

(i) Has lighted anchor lights; or

(ii) Is in an area where anchor lights are not required on vessels; or

(b) Operate an aircraft that is equipped with an anticollision light system, unless it has lighted anticollision lights. However, the anticollision lights need not be lighted when the pilot-in-command determines that, because of operating conditions, it would be in the interest of safety to turn the lights off.