UFC 3-535-01
17 November 2005
7-9.3
Helipad Floodlights
These fixtures must direct the entire output of the fixture below the horizontal. The
average luminance must be 20 lux (2 footcandles) with a uniformity ratio (average to
minimum) of not more than 4 to 1.
7-9.4
Helipad Beacons
These lights are rotating or flashing lights. They must appear to an observer at any
azimuth as a series of flashing lights coded white-green-yellow. The flash duration must
be 75 to 300 milliseconds. The effective intensities of white light for vertical angles
above the horizontal must be:
1 to 2 degrees
12,500 cd
2 to 8 degrees
25,000 cd
8 to 10 degrees
12,500 cd
The minimum intensities of the green flashes must be 15 percent of those
given for the white light, and the minimum effective intensities of the yellow flashes must
be 40 percent of that given for the white light.
7-9.5
CHAPI Systems
The CHAPI light units are similar to a PAPI system (see paragraph 3-7.1), with the
addition of a 2.0 degree wide green sector command path. The vertical color sectors for
the CHAPI system are:
above course
7.5 degrees or more
W
W
slightly high
6.5 to 7.5 degrees
W
G
on course
6.0 degrees
G
G
slightly low
4.5 to 5.5 degrees
G
R
below course
4.5 degrees or less
R
R
7-10
POWER REQUIREMENTS
Provide a main and an alternate power system with the capability to automatically
transfer within 15 seconds from the system in use if a system fails. Typical lighting
control diagrams for helipad lighting systems are shown in Figure 7-7 for systems
without a control tower, and in Figure 7-8 with systems with a control tower.
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