UFC 3-535-01
17 November 2005
Light Approach Slope Indicators (PLASI). See FAA AC 150/5340-14 for additional
information.
3-6.4
Photometric Requirements
3-6.4.1
Uni-directional Fixtures
The requirements for sequenced flashing lights apply.
3-6.4.2
Omni-directional Fixtures
Omni-directional fixtures must flash at a rate of once per second, producing a white light
through 360 degrees horizontally and vertically from +2 degrees to +10 degrees above
the horizontal. Light units must be capable of being shielded when required by local
conditions. Mount REIL fixtures on frangible supports. The unit must be capable of
operating at three intensities:
Step 1 @ 700 280 cd
Step 2 @ 1,500 600 cd
Step 3 @ 5,000 2,000 cd
3-6.5
Power Requirements
The system may be powered separately or by use of a power adapter unit connected to
the runway light circuit. There is no requirement for standby power.
3-6.6
Control Requirements
REIL systems may be controlled separately or coupled to the associated runway edge
light circuit through current sensing relays or other devices. When coupled to the
runway edge lights, they should operate as follows:
Edge Light
REIL
Intensity
Intensity
Off
Off
Step 1 or 2
Low
Step 3
Medium
Step 4 or 5
High
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