UFC 3-535-01
17 November 2005
The connected load typically includes light fixtures, lighted guidance signs, and in some
cases other lighted visual aids such as REIL, PAPI, or lighted wind cones.
15-9.1
Runway and taxiway lights may have newer quartz-type lamps or
incandescent-type lamps. Quartz-type lamps provide improved photometrics at lower
wattage for higher intensity systems, hence lower energy consumption and cost. Many
prefer to stay with incandescent lamps for taxiway edge lights, in part because quartz
lamps have been found to burn out prematurely, and because for this type fixture there
is no reduction in wattage using a quartz type lamp.
15-9.2
Light fixtures basically provide a resistive type load on a series circuit.
Some items, such as flashing REIL, or signs using electronics to provide light output
within a certain range at all circuit intensity steps, introduce other reactive type loads
into a circuit, which may distort the waveform and have an adverse effect on
performance and control. Incandescent lamps have an initial cost lower than quartz
lamps.
15-9.3
Current levels have been established such that, for 5-step system, the
light output (brightness) is 100 percent, 20 percent, 4 percent, 0.8 percent, and 0.16
percent. A system with 3-step control provides light output at 100 percent, 30 percent
and 10 percent at the respective brightness steps.
15-9.4
FAA-specified types of connected loads that may be used for AGL
systems are:
Elevated Light Fixtures
L-860
RW edge, low intensity
L-860E
RW threshold/end, low intensity
L-861
RW edge, medium intensity
L-861SE
RW threshold/end, medium intensity.
L-861E
RW threshold/end, medium intensity (may be used instead of SE
for RWs with either REIL, VASI/PAPI or medium approach
lighting (MALS).
L-862
RW edge, high intensity
L-862E
RW threshold/end, high intensity
L-861T
TW edge
L-804
Runway guard (wig-wag)
In-pavement Light Fixtures
L-850A
RW centerline, high intensity
L-850B
RW touchdown zone, high intensity
L-850C
RW edge, high intensity
L-850D
RW threshold/end, high intensity
L-852A
TW centerline, for straight portion (narrow beam) (non-Category III).
Also used for caution bar.
L-852B
TW centerline, for curved portion (wide beam) (non-Category III).
L-852E or T TW intersection
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