Facility Class 1: Operational and Training Facilities,
Category Group 13: Air Navigation and Traffic Aids Building
Item and Allowance
Radio beacons are of three types: non-directional, air navigation marker, and
terminal VHF omni-range (TVOR). The non-directional beacon (NDB) transmits a
signal from which the pilot of a suitably equipped aircraft can determine the
aircraft's bearing to or from the facility. The NDB operates in the frequency range
of 200 to 535.5 kilohertz (kHz) with a variable radio frequency output power
between 25 and 50 watts.
An air navigation marker is part of an instrument landing system (ILS) and provides
accurate radio fixes along the approach zone. Category II ILS require inner and
TVOR beacon transmits very high frequency (VHF) signals 360 degrees in azimuth,
oriented from magnetic north. These signals provide aircraft with course and
bearing information. The TVOR periodically identifies itself and may use voice
recordings on an automatic terminal information service (ATIS) recorder. These
facilities are normally small, unmanned structures. The facility excludes electronic
equipment and antenna systems that form an integral, equipment-in-place (EIP)
component of this navigational aid.
As provided in the applicable TDA for each airfield/heliport in accordance with the
provisions of AR 310-49, The Army Authorization Documents Systems.
Ground Control Approach System
A radar approach system operated by air traffic control personnel in support of
instrument flight rules (IFR) activities. The approach may be conducted with
airport surveillance radar (ASR) only, or with both ASR and precision approach
radar (PAR). The facility normally consists of small unmanned structures that
house electronic equipment and other equipment installed in the control tower. The
real property facility excludes electronic equipment and antenna systems that form
an integral, equipment-in-place (EIP) component of this navigational aid.
Instrument approach facilities normally authorized for precision-instrumented
airfields will consist of a Ground Control Approach (GCA) System.
(Requisitioning of equipment will be through the Army Communication Command
(USACC) in accordance with AR 95-9, Terminal Air Navigation and Air Traffic