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Aviation History
1969
1969 - 3163.PDF
FLIGHT International, 6 November 1969 ture valves are supplied for the engine de-icing systems of the Concorde and the VFW 614, and for the wing and tailplane anti-icing system of the BAC One-Eleven 500 series. (34) Page Engineering Co (Sunbury-on-Thames) Ltd, Page Works, Sunbury -on- Xhames, Middx (01-768 4242) A two-minute delay device is incorporated in the Trident's anti-icing system to cater for intermittent icing conditions while. under automatic control. This ice detector delay unit, manufactured by Page Engineering, provides two controlled outputs, one to the anti-icing control system operated by the ice detector contacts; its purpose is to maintain the anti-icing system in operation after the detector contacts have opened. (35) Palmer Aero Products Ltd, Golden Hill Lane, Leyland, Lanes (Leyland 21791) Palmer aerofoil de-icer equipment, Goodrich-licence manufactured at the Leyland works of BTR Industries, is produced in a range of systems to suit small piston-engined aircraft such as the Islander and Beagle B.206 series, and turbo-props such as the HS.748, Skyvan and Jetstream. These externally mounted, lightweight rubber de-icers are attached with an air- cure cement, and are manufactured to tolerances approaching those of metal leading-edge skin profiles. In the HS.748 installation, engine bleed air is used to inflate the mainly chordwise tubes, through solenoid-operated distributor valves; alter nate tubes are cyclically pulsated under the control of an electronic timer. Tubes are deflated under suction from ejectors, which also derive their forcing pressure from com pressor bleed air. In the light aircraft system, the spanwise tubes are simultaneously inflated by air at 151b/sq in from the exhaust side of the standard engine-driven vacuum pumps. A transistorised electronic timer operates the control valve solenoids and, when the system is de-energised, pump suction keeps the deflated tubes flat against the skin. (36) Plessey Dynamics Group, Vicarage Lane, llford, Essex (01-478 3040) A minia ture temperature controller for electricially heated windscreens or de-icer elements is now produced by Plessey. The operation-point of this 28V d.c. controller is adjust able over a wide range of settings, and its construction lends itself to stacking. It may be used as an ON/OFF control for any function which can be sensed as a change of resistance. Other Plessey products used in anti-icing systems include hot-air stop-valve actuators and ducting components. (37) Porter Co (Great Britain) Ltd, H. K., Cameron Street, Hillington Glasgow SW2 (Moss Heights 8871) Porter V-band clamps which now include a fail-safe latch which assures a positively sealed, compact light weight joint following in-flight bolt failure, are suitable for use in hot and cold air ducting systems and for accessory mount ings. Porter also supply heavy-duty jet air starter hose. (38) Rollason Engineering Ltd, 20 Progress Way, Croydon CR9 4PP, Surrey (01-688 7238) Rollason's Thawspray trolleys, are supplied to airlines and other operators, for ground application of hot defrosting con centrates such as Kilfrost's anti-icing barrier compound. This mobile spraying plant is equipped with a 50gal insulated tank, petrol-engine-driven pump, thermostatically controlled mains-powered immersion heaters, delivery hose and two 9ft spray lances. Rollason are also about to launch a range of de-icing rigs, produced in association with Hi-Mac Ltd, capable of a lift of up to 50ft and with a capacity of up to l,000gal. Oil fired heating of the fluid is provided. (39) Rosemount Engineering Co Ltd, Dur ban Road, Bognor Regis, Sussex (Bognor Regis 5711) Currently manufacturing a new type of miniature ice detector which is fully ARB approved and is suitable for both ground and airborne use. It is capable of sensing very low thresholds of ice accretion, is proof against dirt and insects and has no moving parts. The detector head can be mounted on the forward fuselage or, alterna tively, directly in the engine intake. The output of the detector can be processed further to give a measure of icing intensity. Rosemount manufacture two types of miniature electrical heating cable capable of producing a high power output per unit length, and these cables are being used for de-icing the intake leading-edges, variable-geometry ramps and the extreme wing leading-edges of the Concorde. The Trident 1C, IE and Nimrod carry Rosemount temperature-control equipment which measures and controls the wing-skin temperatures. For the Trident 2E this equipment provides automatic control of the hot air de-icing valves and controls wing and tail skin temperatures automatically. 713 (40) Rotax Ltd, Willesden Junction, London NW10 (01-965 7777) Solenoid - operated ON /OFF and pressure regulating valves, capable of operating at inlet pressures and temperatures of 3601b/sq in and 550°C respectively, are produced by Rotax for hot- air anti-icing systems in the VClO, One-Eleven, Trident and some Caravelles. Nominal regulated output pressure is 501b/ sq in. In the One-Eleven's and Trident's engine intake anti-icing systems, two of these valves are mounted in parallel in a bifurcated section of the h-p compressor bleed ducting on the top of each Spey. Electrically initiated by the ice detectors or manual switches, and pneumatically self-regulating, either valve can maintain air flow and temperature at the correct level without the aid of other thermal controls. Rotax distributor valves are fitted in the Palmer pneumatic de-icer system. (41) Royal Worcester Industrial Ceramics Ltd, Giljach Load, Tonyrefail, Glam (Tony- refail 666,) To satisfy a requirement from Dunlop for the electro-thermal equipment for the Transall C-160, a sealed terminal has been specially designed by Royal Wor cester which, sized within fine dimensional limits, is capable of withstanding not only air pressure when in use, but also the high temperatures attained during the curing stage of heater element manufacture. Difficulty had been experienced with thermoplastic sealed terminals because of the temperature and moisture absorption during the curing process. The insulating material of the terminals which provide the pressure-tight connections to the elements through the multiple layers of construction, is manufactured from Regalox, a high-alumina ceramic developed by Royal Worcester; it possesses exceptional thermal, mechanical and electrical properties. (42) Sangamo Weston Ltd, Great Cam bridge Road, Enfield, Middx (01-366 1100) A sensitive electrical ice-warning system, comprising a detector head, a resistance thermometer, and either a manual or an automatic reset control unit, is produced by Sangamo Weston for use in several high-performance military aircraft. Any part of an aircraft where a pressure-drop occurs, such as an axial-flow engine intake, is liable to icing even though the ambient temperature is above freezing. The system is designed to operate at the onset of two conditions conducive to icing—the presence of free water in the atmosphere, Right, operators with de-icing lances working on a BAC One-Eleven 500 at Manchester Airport. Simon Engineering (Dudley) Ltd manufac ture the hydraulic platform, which is used there by BEA both for routine maintenance and for winter-weather duties of this kind Below, nose radomes for the Lockheed C-130 Hercules have a built-in de-icing system within their walls. Supplied by Marston Excelsior, the radomes are moulded from glass-fibre-reinforced epoxy resin and in corporate a complex network of air passages within the wall, con nected to glass fibre ducting on the inside of the radome. Marston have produced more than 130 of these units ^^^^sa^»
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