UFC 3-535-01
17 November 2005
4-2.6
Control Requirements
When used in support of instrument operations below 730 meters (2,400 feet) RVR,
provide system monitoring which, at a minimum, gives positive indication at the control
facility that power is being delivered to the system.
4-2.7
Compliance with International Military Standards
4-2.7.1
NATO
These standards meet NATO STANAG 3316.
4-2.7.2
ASCC
These standards meet the requirements of ASCC AIR STD 90/27.
4-2.7.3
Additional Information
See FAA AC 150/5345-46, Specification for Runway and Taxiway Light Fixtures, and
AC 150/5340-24, Runway and Taxiway Edge Light Systems, for more information.
4-3
MEDIUM INTENSITY RUNWAY EDGE LIGHTS (MIRL)
4-3.1
Purpose
MIRLs are used on VFR runways, or runways having a non-precision Instrument Flight
Rule procedure, for either circling or straight-in approaches. MIRLs are not installed on
runways intended for precision approaches.
4-3.2
Configuration
The configuration must be as specified in paragraph 4-2.2 for high intensity runway
edge lighting.
4-3.3
Photometric Requirements
Optimum aiming of lights depends on the design and output of the fixtures used in the
system. Light fixtures may be designed to cover several applications and may have
fixed patterns and aiming angles that differ from this document. Light aiming and
patterns other than those given in this document may be used if the resultant light
pattern produces equivalent light intensities in the required areas. Medium intensity
runway edge lights must be omni-directional and white, except for the last 600 meters
(2,000 feet) which are yellow, the lights will have minimum intensities of the main beams
as follows: from +2 degrees to +10 degrees vertically, 75 candelas minimum, 125
candelas average; from +10 degrees to +15 degrees vertically, 40 candelas minimum.
Where semi-flush lights are required, they may be bi-directional. The edge lights must
be operated at three intensities as follows:
Intensity Step
Percent of Full Intensity
1
10%
2
30%
3
100%
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