transferred to it. Local conditions may necessitate
modification to the following paragraph. Refer to
FAA AC 70/7460-1 for further marking of obstructions.
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Mark and light towers, poles, smokestacks, buildings of certain shapes and
sizes, and other obstructions in accordance with FAA AC 70/7460-1 and as
indicated.
3.13.1
Painting of Airway Obstructions
Patterns and colors to mark obstructions shall conform to FAA AC 70/7460-1
and be as indicated.
3.13.2
Obstruction Marker Lights
Install obstruction marker lights on radio towers, elevated water tanks,
smokestacks, buildings, and similar structures with 25 mm one inch
zinc-coated rigid steel conduit stems using standard tees and elbows,
except that where lowering devices are required, install in accordance with
equipment manufacturer's recommendations.
3.14
ROTATING LIGHT BEACON
Install with manufacturer's instructions, including those for cleaning,
lubrication, adjustment, and other special instructions. Provide
foundations and supports as indicated.
3.14.1
Beam Adjustment
Adjust beam during hours of darkness. Aim beam to provide a minimum of
0.095 rad 5.5 degrees above the horizontal, but not higher than necessary
to clear principal obstructions.
3.14.2
Install panelboard at top of structure to provide separately protected
circuits for beacon lamps,[ heaters,] motor, and obstruction lights. Locate
cabinet on side of platform opposite ladder. Install conduit riser on
tower in a corner angle and do not locate near the ladder.
3.15
HELIPORT LIGHT BEACON
Install in accordance with specifications and manufacturer's instructions,
including those for cleaning, lubrication, adjustment, and other special
instructions. Provide foundations and supports as indicated.
3.15.1
Beam Adjustment
Adjust beam during hours of darkness. Aim beam to provide a minimum of
0.095 rad 5.5 degrees above the horizontal, but not higher than necessary
to clear principal obstructions.
3.15.2
Install panelboard at top of structure to provide separately protected
circuits for beacon lamps,[ heaters,] motor, and obstruction lights. Locate
cabinet on side of platform opposite ladder. Install conduit riser on
tower in a corner angle and do not locate near ladder.
SECTION 16522N
Page 37