3.16
HELIPAD LIGHT BEACON
Helipad light beacon shall be installed in accordance with specifications
and manufacturer's instructions, including those for cleaning, lubrication,
adjustment, and other special instructions. Foundations and support shall
be provided as indicated.
3.16.1
Beam Adjustment
Beam shall be adjusted during hours of darkness. Beam shall be aimed a
minimum of 5.5 degrees above the horizontal, but not higher than necessary
to clear principal obstructions.
3.16.2
Power Supply and Wiring
Panelboard shall be installed at top of structure to provide separately
protected circuits for beacon lamps, heaters, motor, and obstruction
lights. Cabinet shall be located on side of platform opposite ladder.
Conduit riser shall be installed on tower in a corner angle and not located
near ladder.
3.17
WIND DIRECTION INDICATOR
Installation shall include a 7.5 m 25 foot black circle constructed on the
ground with center at center of the wind cone base. Circle shall be
constructed of an emulsified asphalt-sand mixture or of a cut-back
asphalt-sand mixture not less than 125 mm 5 inches in thickness.
Asphalt-sand mixture shall contain not less than 6 percent bitumen. Sand
shall be well graded with not more than 10 percent material which will pass
through a No. 200 mesh sieve. Asphalt-sand mixture shall be compacted
thoroughly and sloped for drainage from center to outer rim from one side
to the other. Wind cone direction indicator shall be guyed as indicated.
The obstruction lights shall be energized from [multiple] [series] [series
or multiple circuits] as required by the contract drawings.
3.18
HELIPAD GLIDE SLOPE INDICATOR
The helipad glide slope indicator, CHAPI, system shall be on an
independently controlled power circuit.
3.19
ISOLATION TRANSFORMERS
Transformer primary leads shall be connected to primary cables with
connectors conforming to FAA AC 150/5345-26. Transformer secondary shall
be connected with connectors conforming to FAA AC 150/5345-26 and plugged
directly into a mating connector on the transformer secondary leads.
During installation, mating surfaces of connectors shall be kept covered
until connected and clean when plugged together. At joint where connectors
come together, heat shrinkable tubing shall be installed with waterproof
sealant. [Alternately, 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.
3.20
FIELD QUALITY CONTROL
The Contracting Officer shall be notified [5] [_____] working days prior to
[each] [_____] test[s]. Deficiencies found shall be corrected and tests
repeated.
SECTION 16525A
Page 34
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