Aiming Screen
If in use, the screen should be at least 1.52 m (5 ft) in height by 3.66 m (12 ft) in width. The finish should be matte white. Keep the surface well shaded from extraneous light. Keep the screen in proper adjustment with the floor. The screen should be moveable in order to keep the screen in alignment parallel with the rear axle of the vehicle. Position the screen so that a horizontal line (3) drawn perpendicular to the centerline of the screen passes an equal distance midway between the headlamps.
Provide the screen with the following items:
- A vertical centerline (4)
- Two laterally adjustable vertical tapes (2)
- One vertically adjustable horizontal tape (3)
If a regular, commercial aiming screen is not available, the screen may consist of a wall having a clear, uninterrupted area of at least 1.52 m (5 ft) height by 3.66 m (12 ft) width. The surface should be finished with a washable, no-gloss white paint. After establishing the aiming screen, paint or tape a reference line (6) on the floor 7.62 m (25 ft) from the screen. Park the vehicle with the front of the headlamps directly over this reference line.