UFC 3-535-01
17 November 2005
6-8
CONTROL REQUIREMENTS
6-8.1
Obstruction lights intended for day marking must remain on at all times
and have automatically selected reduced intensity levels for night operations. Other
obstruction's lights must be on when the northern sky illumination falls on a vertical
surface to a level of not less than 350 lux (35 footcandles), or during daytime, when
visibility is restricted. The lights may be turned off when the northern sky illuminance
rises to a level of (580 lux) 58 footcandles or more.
6-8.1.1
Dual Lighting
This system consists of red lights for nighttime, and high or medium intensity flashing
white lights for daytime and twilight. When the dual system incorporates medium
flashing intensity lights on structures 150 meters (500 feet) or less, or high intensity
flashing white lights on structures of any height, other methods of marking may be
omitted.
6-8.2
If practicable, obstruction lights should be controlled from the airfield
lighting control panel. Otherwise use automatic controls and provide a locked auxiliary
manual control at ground level on the exterior of the object to be lighted.
6-9
MONITORING REQUIREMENTS
Obstruction lights should be visually observed for proper operation at least once each
24 hours. If the lighting can not be readily observed, provide a remote monitoring
system to indicate the malfunction of all the top lights and any flashing or rotating
beacons regardless of their position.
6-10
COMPLIANCE WITH INTERNATIONAL STANDARDS
6-10.1
NATO
These standards meet the requirements of STANAG 3346, Marking and Lighting of
Airfield Obstructions, except for the use of high intensity white lights.
6-10.2
ASCC
These standards meet the requirements of AIR STD 90/19, Lighting and Marking of
Airfield Obstructions.
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