Access the full text.
Sign up today, get DeepDyve free for 14 days.
References for this paper are not available at this time. We will be adding them shortly, thank you for your patience.
20 AIRCRAFT ENGINEERIN G January 1973 TRAFFIC CONTROL RADAR nuisance and, at Heathrow, the effluent has been causing pollution of An airfield surface movement indication radar has been designed to the receiving canals, thus increasing the strength of the discharge to the provide daylight viewing displays for reproducing the PPI picture at any associated sewage works. desired number of remote positions. The brightness of each display can Aeration can 'degrade' these pollutants to a degree which makes the be varied to suit the prevailing light level without reducing the quality quality of the discharge acceptable to the river authority. of the radar picture, enabling it to be viewed without a hood in the bright The aeration system installed by Ames Crosta will satisfy any oxygen est conditions of any visual control room. demand of 14,500kg/day (32,0001b/day). It consists of nine 56kW (75hp), It provides the controllers with continuous all-weather surveillance of aerators, arranged in three lines of three, in a lagoon of 10·35 hectares (26·5 the airport surface at ranges up to 4km. The radar operates in Q-band acres). The lagoon has an average depth of 2·13m (7ft) and an approxi with a 0·4deg horizontal beam width, a pulse length of 0·03µsecs and an mate volume of 226,400m3 (8 × 106ft3). As there is very little movement of aerial rotation rate of 740rpm, giving a high definition flicker-free picture. liquid in the lagoon, the arrangement of nine catamaran-type aerators The clarity of the display is such that experienced operators can often provides the optimum oxygen input from the total available power of distinguish between aircraft of one type and another. 504kW (675hp). This distribution allows more practical and efficient oxygenation than would be achieved from a 500kW aerator acting alone. At Rome's Fiumicino airport the installation comprises twin transmit ter-receivers feeding a common aerial system so arranged that one trans Individually, each catamaran-type aerator is made up of twin rec mitter is operating into the aerial while the other is feeding a dummy load, tangular-section hulls, which are connected by cross-beams with a girder- giving virtually instantaneous changeover if necessary. The radar and type bridging structure bolted to their top faces. The bridge carries the aerial unit are sited at a distance of 1500m from the control tower and aeration cone and the associated drive gear, comprising an electric motor are remotely controlled from the display area. which drives the aerator through the single helical, double reduction gearbox, of extremely high efficiency. Each hull is filled with polyurethane The radar data is fed to a Decca scan convertor equipment, also in two foam so that it is virtually unsinkable. channels, sited at the radar unit and provided with remote control of range scale and off-centring. The converted data in TV form is fed over Eventually, it is hoped that some of the treated water can be used by equalised cables to the visual control room at the top of the control the airport fire brigade and other services within the airport confines, so tower and is finally displayed on four 40cm high brightness monitors. that a reclamation bonus can be derived from the aeration plant. Decca Radar Ltd, Decca House, 9 Albert Embankment, London Ames Crosta Ltd, Heywood, Lancashire. SE1 7SW. Telephone: 01-735 8111. EFFLUENT EVACUATION AERATION EQUIPMENT A 600 gall TSU self propelled unit is capable of effluent evacuation by Aeration equipment, installed at London's Heathrow Airport by vacuum, and water system replenishment, of the current range of aircraft. Ames Crosta Ltd, will reduce the pollutional load of the surface drainage The prime mover is a Ford D1110 11·5 ton f GVW and approximate water from the airport's runways and standing areas. wheel base 156in. This vehicle is fully described in the manufacturers' It is the practice of the British Airports Authority to provide drainage handbook. lagoons to assimilate surface water and the influent to these lagoons can The basic unit consists of a rectangular hollow sections constructed contain such pollutants as glycol-based de-icing fluids and the synthetic support frame, secured to the chassis upon which all tanks, baseplate, detergents used for aircraft washing. superstructure, etc. are affixed. Access to the tank inspection covers can Particularly in hot weather, this waste product can create a smell be through two hatches in the top of the superstructure. Lifting doors on the port and starboard sides offer access to the control compartment. Access to the night soil tank is through the hinged door at the super structure front whilst a hatch on the lower part of the port side allows entry to the water tank drain cock. The main effluent suction hose is stored on the lift platform. A working level is provided on the top of superstructure. The level can be mounted via the integral built ladder on the port side. An elevating platform is provided at the rear, 12ft maximum, this carries all controls and pipework etc. necessary to service aircraft. Driving power for water pump and compressor is produced by a hydraulic motor driven from a hydraulic system via a power take off system, are housed in the cab. The lift platform is also powered from the PTO and the controls for elevation are housed on the platform. Electrical services for the vehicle are powered by two batteries cradle mounted within the control compartment. Metering pump, beacon, and spotlamp operation are provided by the 12V vehicle system. The overall length is 232in (5892mm), width 80in (2032mm), and height 86iin (2197mm). The upper working level height is 62in and intermediate 39in. The vehicle tank capacity is 10gal and the water tank 300gal and the effluent tank 600gal. The water pump is 10gpm at the rate of 10:25:50psi, the vacuum pump 75ft3/min and the metering pump 25gpm at the rate of 50psi. H. W. Edghill Equipment Ltd, Hook, Basingstoke, Hants.
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Jan 1, 1973
You can share this free article with as many people as you like with the url below! We hope you enjoy this feature!
Read and print from thousands of top scholarly journals.
Already have an account? Log in
Bookmark this article. You can see your Bookmarks on your DeepDyve Library.
To save an article, log in first, or sign up for a DeepDyve account if you don’t already have one.
Copy and paste the desired citation format or use the link below to download a file formatted for EndNote
Access the full text.
Sign up today, get DeepDyve free for 14 days.
All DeepDyve websites use cookies to improve your online experience. They were placed on your computer when you launched this website. You can change your cookie settings through your browser.