Specifications - ILS
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INSTRUMENT LANDING SYSTEM (ILS)PART 1 - GENERAL REQUIREMENTS 1.1 Scope of Specification
1.1.1 This specification sets out the minimum requirements for the supply and installation of a Category I Instrument Landing System (ILS) complete with high intensity approach lighting and Tower(s). 1.1.2 The installed system shall include the Localizer and Glideslope stations and the necessary accessory equipment for a complete installation. The systems shall be of a solid state design and each shall include an electronics subsystem, antenna system, shelter-to-antenna system cables, installation and interface kits, no-break battery backup system of the maintenance free design and necessary accessory items such as extender boards and cables and wattmeter elements. 1.1.3 The systems shall all be microprocessor controlled and shall have been designed for ease of installation, high reliability, maximum attention to fail safe characteristics in all monitoring systems, enhanced system security, the minimum number of required control and telephone lines and maximum attention to equipment and personnel safety. Circuit breakers and fuses on AC & DC power lines and internal circuits shall offer maximum protection for the equipment. Surge suppression devices shall be installed in all electronic equipment shelters. System software shall have been designed in accordance with RTCA DO-178. The systems shall be designed around a plug and play philosophy to the maximum extent possible where replacement modules are automatically configured for their correct operating parameters when inserted in the system cabinet. Operator interfaces to the system using computers shall be designed around Windows based operating software. 1.1.4 The Localizer and Glideslope Electronic Subsystems shall consist of a Capture-Effect dual transmitter, dual monitor configuration of a modular design. The all solid state systems shall be housed in a single cabinet which is designed for mounting on the wall of an equipment shelter. The cabinets shall feature front access for all major components and may be designed in a hinged, swingout arrangement to allow access for installation and any rear mounted components. The Localizer and Glideslope shall be easily field upgradeable from Category I to Category III with the addition of a FFM ( Far Field Monitor ) 1.1.5 The Localizer antenna system shall consist of a 14-element, wide aperture Log Periodic Dipole (LPD) array of the Capture-effect design. The antenna system shall be furnished with all antenna elements and frangible supports, centrally mounted RF distribution/monitor combining unit, cable raceway, all coaxial feed and monitor cables, obstruction lighting and all civil and grounding kits needed for a complete installation. The array shall include integral monitoring pickup devices in each of the antenna elements. The antenna system shall include Antenna/ Feedline/ RF Distribution unit/ RF Combining unit, Fault monitoring circuitry, as well as provisions for generating a station alarm should any of the elements in the array become misaligned from its normal position. The height of the array shall be the minimum practical for the design. 1.1.6 The Glideslope antenna system shall be of the capture-effect design and utilize an array of three directional antennas mounted on a triangular steel tower with integral ladder. The system shall be furnished with antenna elements, transmitting tower, coaxial feed and monitor cables, obstruction lighting and all civil and grounding kits needed for a complete installation. The antenna system shall include integral monitoring using pickup devices in each of the array elements.
ILS System City of Brandon
INSTRUMENT LANDING SYSTEM (ILS)1.1.7 The Localizer and Glideslope systems shall each be provided with an electronic equipment shelter of the fiberglass design. Shelter size shall be 8' W x 12' L x 9' H, and each shelter shall be painted international orange and white. Each shelter shall be capable of withstanding wind loads of 100 mph in its installed condition. The shelters shall be equipped with thermostatically controlled air conditioning, heating, and ventilation equipment and shall be completely wired including interior and exterior lighting with switches, electrical outlets, circuit breaker panel, and power line surge suppression equipment. All installation and grounding accessories shall be included with each shelter. In addition, a VHF communications antenna shall be furnished with each shelter for use during Flight Inspection activities. Interior shelter accessories shall include a workbench, storage cabinet, shelving and a stool. 1.1.8 A high integrity integral monitoring system shall be incorporated in the Localizer and Glideslope systems to provide fault detection by monitoring the transmitted navigation signals and initiating automatic station transfer/shutdown action in the event of an out-of-tolerance condition. Dual, parallel monitoring channels shall be included for the measurement of important signal parameters. Independently adjustable executive and maintenance alarm indications shall be included both locally at the station and remotely through the Remote Maintenance Monitoring (RMM) system. Independently adjustable pre-alarm (maintenance alert) indications shall be included for all executive monitoring parameters. Integrity of the Monitors shall be assured by certification testing using a built-in Test Generator. The monitoring system shall include a bypass capability to disable the automatic station control action during adjustment and maintenance. Front panel amber "bypass" and "alarm" lights shall be illuminated any time the monitor channels are bypassed or are in an alarm condition. All monitored and internally measured system parameters shall be available for display via a station RS-232 communications port and a Portable Maintenance Data Terminal (PMDT). The parameters shall also be available remotely through the Remote Maintenance Monitoring system. 1.1.9 The Localizer and Glideslope station control systems shall provide for manual control of the stations during maintenance operations and for automatic control during unattended operation. The following features shall be provided as a minimum: a) b) Local on/off control and status indication of the transmitting equipment. Selection of which transmitter operates as Main and which operates as Standby.
c) Monitor bypass capability with indications for the Main and Standby Transmitter monitoring systems. d) Provisions for either Local or Remote control of the transmitting equipment. e) System reset capability.
f) Automatic transfer capability from the Main to the Standby transmitting equipment in the event of an alarm condition.
ILS System City of Brandon
INSTRUMENT LANDING SYSTEM (ILS)g) Automatic station shutdown following transfer to the standby transmitting equipment should the station remain in an alarm condition. h) Two automatic station restart attempts following shutdown for the Localizer and Glideslope stations; the first after an adjustable time delay period of 20 to 60 seconds and the second after a fixed delay of 5 minutes. i) Automatic station transfer to and from the no-break standby battery system in the event of a primary AC power failure and subsequent restoration, and automatic turn-on following restoration of primary AC power should the standby battery system be depleted. The batteries shall automatically recharge on restoration of primary power. j) Built in Wattmeter with selectable inputs, including forward / reverse powers for the main transmitter, and forward powers for the standby transmitter. 1.1.10 In addition to the control features and associated switches above, system control and monitoring functions as well as verification and adjustment of proper operating and monitoring parameters shall be available via an RS-232 communications port on the transmitter cabinet and a Portable Maintenance Data Terminal (PMDT). The system shall be password controlled such that system adjustments are possible only with entry of the proper security codes. A second RS-232 communications port shall be connected to a modem for system operation and monitoring via a dial-up telephone line to a remote location. 1.1.11 The integral Remote Maintenance Monitoring (RMM) system shall operate in conjunction with the Control System above and shall permit remote monitoring, control, data recording and certification of proper operation of the Localizer and Glideslope subsystems. The RMM shall provide the following key functions: a) System control; b) c) d) e) f) g) h) Adjustment of system operating parameters; Monitoring of system performance and certification parameters; Adjustment of all alarm and alert monitoring limits; Monitor Certification through the system test generator; Storage of monitor alert and alarm data; System Diagnostics; Monitoring of routine maintenance parameters;
i) Monitoring of environmental parameters including Intrusion detector, temperature and smoke sensors, obstruction lighting; j) Monitoring of Primary AC power applied to the system and Standby Battery Voltage and Current.
ILS System City of Brandon
INSTRUMENT LANDING SYSTEM (ILS)1.1.12 The RMM system shall be designed in accordance with Federal Aviation Administration (FAA) Order 6000.32 (Security Requirements for Remote Access of National Airports System (NAS) Facilities) and feature a 3-level security system to insure only authorized personnel have access to the various system functions and commands: Level 1 Allows access for display-only of system status, configuration and monitored system parameters. No control functions are available at this level. Level 2 Level 1 access plus the ability to run tests or diagnostics and make adjustments which do not affect the integrity of the system. Level 3 Full