UFC 3-535-01
17 November 2005
5-2.4.2
On taxiways where the aircraft movement is in one direction only, the
lights may be uni-directional and facing the oncoming aircraft.
5-2.4.3
Where hold lights are installed, the centerline light must be aviation yellow
facing the holding aircraft.
5-2.5
Photometric Requirements
Taxiway centerline lights must be bi-directional and emit aviation green light at three
intensity steps: 100 percent, 30 percent, or 10 percent of full brightness. The minimum
intensities and beam widths are shown in Table 5-1.
Table 5-1. Taxiway Centerline Light Intensity and Beam Widths
Average
---------------- BEAM WIDTH ----------------
Intensity
50% Of Main
10% Of Main
Application
of
Beam Average
Beam Average
Main Beam
Hor.
Vert.
Hor.
Vert.
Category II
Straight
20 cd
10
1 to 4
16
0.5 to 10
Curved
20 cd
30
1 to 4
30
0.5 to 10
Category III
Straight
200 cd
3.5
1t8
4.5
0 to 13
Curved
100 cd
30
1 to 10
30
0 to 15
5-2.5.1
Horizontal Aiming
Aim lights on straight sections parallel with the taxiway centerline. Aim lights on curved
sections along the tangent at the light location.
5-2.6
Power Requirements
Provide a main power system and circuits which permit independent control of the
taxiways. Provide standby power only for those taxiways essential for precision
instrument approaches. Transfer time from the failed system to standby system must
not exceed 15 seconds.
5-2.7
Control Requirements
Provide remote on and off and three step intensity control. The system may be
segmented to provide flexibility in choosing taxiway routing.
5-2.8
Monitoring Requirements
There is no monitoring requirement for taxiways.
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