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Aviation History
1947
1947 - 0817.PDF
MAY 22ND, 1947 FLIGHT 477 I.C.A.O. Affiliated to United Nations : Pakon- ham Committee Report 1CIVIL AVIATION NEWS FLIGHT TRIALS. The second pro- totype Marathon in flight, Whereas the first prototype had three fins and rudders this aircraft has only two. TELECOMMUNICATIONS AT LONDON AIRPORTT HE Ministry of Civil Aviation claims that London Airport already has the best telecommunication system in the world. Those services already installed are being extended and improved with modern equipment and the follow- ing is an account of the present situation there and what might be expected in the immediate future. For dealing with routine signals traffic/ and meteorological information, pneumatic tube message conveyors have been in- Stalled between the traffic office and the principal M.C.A. offices. This system will probably be extended to the offices of the airline companies in due course, but it is unlikely to be done until the permanent buildings are erected. Eighteen teleprinters are in use at present to provide two-way communi- catio;i with Birdlip, Northolt, Croydon and Shannon, and one- way connections with Prestwick, Cable and Wireless, the Central Telegraph Office in London, and the airline operating .^-companies' offices at the airport. Outgoing messages average 'ijjjj&'.ouo each day, the majority of them having at least three Jpiddfes.ses. Practically all the messages intended for Europe, *rho.vve\o£, pass through Northolt, which has direct teleprinter * connection with the principal Continental centres. AUTOMATIC DIRECTION FINDER. The Standard Radio Type P.V.i-B two-channel V.H.F. Cathode-Ray Direction Finder as installed at London Airport. The screen can be seen in the centre of the lower panel. lor air-to-ground communication, London Airport is equipped with receiving and D.F. apparatus and two TR1196 transmitter-receivers working on 5,100Kc/s for local control. The usual M.F., H.F. and V.H.F, R/T, communications systems are installed, and M.F., 11.F. and V.H.F. D/F. facilities are available. It is noteworthy that about 20 to 25 aircraft ask for M.F. (345-348 Kcs) bearings every day, which suggests that old customs die hard. Monitor receivers are installed and are continuously manned on all the air-to-ground communication frequencies. A team of operators is always standing by to transmit urgent messages by hand in the event of a teleprinter breakdown. The meteorological section supplies forecasts three times in eachfthour. A sub-regional forecast is broadcast at the hour on 8,515 Kcs. 3,961 Kcs and 279 Kcs, and, at half-hourh intervals, two abbreviated versions are broadcast on 27<j K< s, all by W/'T. There are 16 transmitters, some of which .if R.A.F. type T1131 and T1190, Standard Telephone.-; au.l Cables TS4 and ESL50, and one 2 Kw <.. 1 2C made In Re-diffusion. Power is taken from the A.C. mains, but auto- matically started diesel generators lunt- been installed ior emergencies. In the event of a power failure, the Uuteiv- driven starter motor is switched on bv a relay, rind the diesel cuts in. A similar arrangement provides alternative supply to the control tower when needed All the remote receivers have auto-start motor generators driven Ircrn lotteries. As already mentioned in Flight. d.C.A. is installed, but is manned during the daylight hours only, by R.A.F. crews. S.B.A., B.A.B.S. and I.L.S. (SCS51) approach systems and the Eureka beacon are installed and working Airfield Control Radar (A.C.R.) is being fitted now and should be in operation in the near future. Incorporated in this version ot A.C.R. will be the Standard Radio Cathode Ray Automatic Direction Finder, Type P.V.i-B, similar to the equipment demonstrated 10 the P.T.C.A.O. delegates at Bassingbourn. An automatic and instantaneous bearing-indication by a single radial line is given of an aircraft transmitting> 011 V.H.F. R/T. The controller thus has a plan view of the airport area with airborne aircraft indicated as individual sr>ots of light, and the aircraft with which he is in contact by V If 1'. R/T. identified on the same screen. This is the first tune such a combination of systems has been used commercially. MILES MERCHANTMAN RF.SKMBL1NG in essentials a scaled-ini foui en^ined versionof the Aerovan. the Merchantman freighter, lately announced, will be of all-metal construction. lour 1)11. Gipsy Queen ^o engines will be fitted, giving a cruising speed of 155 m.p.h., and the undercarriage will be of fixed tricycle layout, though each of the two main units will, in fact, be composed of two wheels. The manufacturers state that it was decided to use four power units, rather than two of equivalent power, primarily to meet the spirit as well as the letter of the I.C.A.O. require- ments in respect oi t'tigi/n lailure on take-off. They are con-
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