FAA AC 150/5340-30H
Runway centerline lighting.
(1) Location. The runway centerline lights are located along the runway centerline at 50 ft. (15m) equally spaced longitudinal intervals. The longitudinal tolerance for runway centerline lights is ±2 ft. (0.6 meter). See Figure 33 for a graphic of the runway centerline lighting layout. The line of runway centerline lights may be uniformly offset laterally to the same side of the physical runway centerline a maximum of 2.5 ft. (0.8 m) (tolerance ±1 inch (25.4 mm) measured from the physical runway centerline to the fixture centerline. For any new runway, the light base installation must be no closer than 2 ft. (0.6 m) (measured to the edge of the fixture base) to any pavement joints. Runway extensions of existing runways must use
the convention already established for that runway. See paragraph 4.3 and Figure 45 for additional information about the taxiway centerline lighting location requirements related to runway centerline lights for major taxiway turnoffs. See AC 150/5340-1 for additional information about runway centerline marking widths and location.