Attachment 3
Table A3.3.
Facility Class 1: Operational and Training Facilities,
Category Group 13: Air Navigation and Traffic Aids Building
Category
Item and Allowance
Code
13440
Instrument Landing System
The Instrument Landing System (ILS) consists of three main elements: a
directional localizer, a glide slope indicator, and radio marker beacons. These three
precision electronic elements provide aircraft with course alignment, descent and
range information, respectively, during instrument flight rules (IFR) approaches to
the runway under adverse weather conditions or poor visibility. The ILS normally
consists of small, unmanned facilities that house electronic equipment. The real
property facility excludes electronic equipment and antenna systems that form an
integral, equipment-in-place (EIP) component of this navigation aid.
An Instrument Landing System (ILS) may be authorized at Army airfields where air
navigational aids for use under Instrument Flight Rules (IFR) are required for
operation or aircraft of other services, for commercial aircraft in support of Army
missions or under air traffic conditions where a GCA facility, item 13430, would be
inadequate. Special justification should be submitted to the Office of the Chief of
Engineers for Department of the Army approval. Construction for foundations and
equipment pads will be accomplished by the using service.
13450
Navigational Lighting
Navigational lighting consists of three types: rotating light beacon, flashing light
beacon, and air navigation obstruction lighting. The rotating light beacon is the
internationally recognized white and green flashing light signal that indicates an
airfield. The facility normally consists of a high candlepower unmanned piece of
equipment.
Air navigation obstruction lighting is one or more electrically operated red, or high-
intensity white lights that identify hazards to aircraft operation. Flashing and
steady-burning red obstruction lights may be used during darkness or periods of
reduced daytime visibility. Flashing high-intensity white lights may be used for
both daytime and nighttime conditions. The facility normally consists of an
unmanned piece of equipment.
13470
Wind Direction Indicator
A facility which provides a visual indication of surface wind direction at Army
airfields, heliports and helipads. These facilities include wind socks, wind cones,
and wind tees. Lights are used to illuminate the pointing device. The facility
normally consists of an unmanned piece of equipment.
A3-15
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