3.16
WIND DIRECTION INDICATORS
Installation shall include a 7620 mm 25 foot black circle constructed on
the ground with center at center of the base. Construct circle of an
emulsified asphalt-sand mixture or of a cut-back asphalt sand mixture and
not less than 125 mm 5 inches in thickness. Asphalt sand mixture shall
contain not less than 6 percent bitumen. Provide well graded sand with not
more than 10 percent material which will pass through a No. 200 mesh sieve.
Compact asphalt-sand mixture thoroughly and slope for drainage from center
to outer rim from one side to the other. [Guy wind cone direction
indicator as indicated.]
3.17
ISOLATION TRANSFORMERS
Make connections of transformer primary leads to primary cables with
connectors conforming to FAA AC 150/5345-26. Make connection to
transformer secondary with connectors conforming to FAA AC 150/5345-26 and
plug directly into a mating connector on the transformer secondary leads.
During installation, keep mating surfaces of connectors covered until
connected and clean when plugged together. At joint where connectors come
together, install heat shrinkable tubing with waterproof sealant.[
Alternatively, the Contractor may provide two half-lapped layers of tape
over the entire joint.] Joint shall prevent entrapment of air which might
subsequently loosen the joint.
3.18
RUNWAY AND TAXIWAY LIGHTING SYSTEMS
3.18.1
Runway and Taxiway Centerline Lights
Provide a transformer for each group of four 45-watt or three 65-watt
centerline lights and install in a handhole as indicated. Connect lights
to secondary circuit wires at fixture leads using preinsulated watertight
connector sleeves crimped with tool that requires a complete crimp before
tool can be removed. Make connection at staggered locations and wrap with
one layer of half-lapped plastic electrical insulating tape. Install light
fixtures in holes drilled in the pavement as indicated.
3.18.2
Touchdown Zone Lighting Installation
Provide a light base for traffic bearing areas specified for each light and
transformer as indicated. In making cable connections, provide sufficient
slack cable in each base to permit connection to be made above ground, or
as indicated.
3.18.3
Circuit Selector Cabinets
Install as indicated and in strict accordance with manufacturer's
instructions.
3.19
SIMULATED CARRIER DECK LIGHTING SYSTEM
3.19.1
Light Fixtures
Install in runway pavement as indicated, with centerline of unidirectional
light beam aimed toward the nearer runway threshold and parallel to runway
centerline.
SECTION 16522N
Page 38
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