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Aviation History
1920
1920 - 0624.PDF
JUNE IO, 1920 AIR MINISTRY NOTICES Donibristle Aerodrome A 70-foot wireless mast has been erected on the northern side of Donibristle Aerodrome, approximately 200 yards east of the easternmost shed. (Notice to Airmen No. 60, June 3.) Aerial Route Traffic Control by Radio-Telephony 1. Radio-Telephony.—Radio-telephone stations are open for work at Croydon and Lympne, for the London-Paris and London-Brussels routes. The French authorities have also installed similar statins at St. Inglevert, Valenciennes, Paris (Le Bourget) and the Belgian authorities are arranging to instal one at Brussels (Evere). 2. Stations will shortly be opened for the London, Bir- mingham, Manchester, Glasgow route at Castle Bromwich, Didsbury and Renfrew., 3. The wireless control of all the British stations, including stations licensed on private aerodromes, will be carried out by Croydon. ^ • „ ... 4. Wave length, 900 metres. 5. Procedure as in Appendix should be used. 6. Telephony will be used primarily for giving information as to the whereabouts of an aircraft travelling or about to travel along a route; secondly, for reporting weather condi- tions along the route to the machine. 7. Routine.-—Hours of watch for British stations are 06.30 to 19-30 G.M.T. (07.30 to 20.30 B.S.T.). The foreign authori- ties have kindly consented to put their stations in operation if due notification is given. When aircraft fitted with radio-telephones are scheduled to leave London, notification must be sent to C.A.T.O. Croydon as early as possible on the day of flight, and in any case at least one hour before starting. The C.A.T.O. Croydon is responsible for advising stations along the route of the name (distinguishing signal) of the aircraft and time of departure. This notification is to be done as follows :— Taking as an example Handley Page G.E.A.M.A. with telephony scheduled to leave Cricklewood at 09-30 for Paris. As soon as C.A.T.O. Croydon receives notification, he informs Lympne and the French stations as follows : " Handley Page G.E.A.M.A. Cricklewood to Paris 09.30." Lympne passes this message to St. Inglevert; St. Inglevert passes it to Paris. All stations are thus warned for the flight. The Aircraft.—Immediately after leaving its aerodrome, calls Croydon, and passes the following message : " Handley Page G.E.A.M.A. clear Cricklewood to Paris." Croydon replies : " Clear to Lytnpne." The aircraft when approaching Lympne and about 20 miles away calls Lympne and passes the following message: . " Handley Page G.E.A.M.A. London to Paris." Lympne replies, if the weather conditions at St. Inglevert according to the last report received from that station are favourable : " Clear to St. Inglevert." If unfavourable, Lympne replies in accordance with its latest report from the latter station, e.g., " Thick fog in Channel, clear south ot St. Inglevert," or " Channel clear, thick St. Inglevert to Abbeville, clear south of Abbeville." On approaching St. Inglevert, the aircraft reports in the same way and receives a similar reply. Again on approaching Paris the aircraft reports in a similar manner. Paris replies : " Clear to land." If conditions prevent the aircraft from landing at Le Bourget, Le Bourget replies to this effect, and gives necessary instructions. The French language should be used for foreign stations 8. All radio-telephonic conversation must be kept as short and concise as possible, • ,•• '•;•• • (Notice to Airmen No. 6i, June 3.) .•'.-,-~"iV~;": r Appendix to Notice to Airmen No. 61 -.?'• -.;....^j;.~vv--;y.;_'. * Radio-Telephony '.--'••=.• ,,-~,.-:-; ;:- -"••••• Method of Calling Up and Procedure for Two-Way Working. 1. General.—All stations normally "listen out" on their assigned wave-length at their routine times. In the following remarks on procedure, a star (•) indicates change over of the " Receive " " Transmit " switch at a station to the position corresponding to its required function at that moment. 2. Call Signs.—(This matter is under discussion at the present.) 3. Procedure.—Ground to air and vice versa. The following illustrates the procedure adopted for work between a ground and an air station where preliminary tuning is probably required :—• Station A has a message for Station B. A calls np: Hullo B. HulloJB.* A calling. A calling. I have a message for you. I have a message for you. A changing over. B replies : Hullo A. Hullo A.* Hullo A. B answering. B answering. Please pass your message. Please pass your message. B changing over. A replies : Hullo B. Hullo B.* Hullo B. A answering. A answering. Message begins. Message begins. To . From (repeats message). Message ends. Message ends. A changing over. B replies : Hullo A. Hullo A.* Hullo A. B answering. B answering. Your message begins. Your message begins. Message. Your message ends. Your message ends. B changing over. A replies : Hullo B. Hullo B.» Hullo B. A calling. A calling. That is correct. That is correct. B good-bye. A switching off. 4. Procedure.—Ground to ground.* The following abbre- viated procedure to be used between ground stations, A and B keeping constant watch and no tuning therefore required. A A calls up : Hullo B. Hullo B.» Hullo" B. A calling. A calling. I have a message for you. I have a message for you. Message begins. Message begins. To . From (repeats message). Message ends. Message ends. A changing over. B replies : Hullo A. Hullo A.* Hullo A. B answering. B answering. Your message begins. Your message begins. Message. Your message ends. Your message ends. B changing oveE*£" A replies : Hullo B. Hullo B.* Hullo B. A answering. A answering. That is correct. That is correct. B good-bye. A switching off. 5. Repetitions.—-In the event of the repetition of the whole or part of a message being requisite, this will be asked for as required, as also any request to wait on account of interference or other reason. Motor-Cycle Races in Isle of Man on June 15 and 17, 1920. ON the occasion of the International Motor-Cycle Tourist Trophy Races which take place in the Isle of Man on June 15 and 17; 1920, pilots are particularly requested to avoid flying over the course of the race, unless they do so at an altitude of not less than 6,000 feet. The course of approxi- mately 37J miles, starting and finishing near Douglas, has to be covered eleven times on the two days by competing machines. The route follows the road Douglas, Crosby, Ballig Bridge, Kirkmichael, Sulby Bridge, Ramsey, East Snaefell Gate, Graig-ny-Baa, Douglas. This request is made owing to the grave risk of accident to competitors should their attention be distracted in any way from their riding by aircraft flying low overhead. (Notice to Airmen No. 62.) Aerodromes for Civil Use in Egypt and Mesopotamia IT has been decided that where the exigencies of the Service allow, civil aircraft, whether British or foreign, may be allowed to make use of existing facilities at Royal Air Force Stations in Egypt and Mesopotamia. So far as local conditions permit, the ordinary procedure in regard to the use of Service Aerodromes by civil machines will be followed, with the following exceptions :— Repairs.—50 per cent, will be added to labour charges to cover overhead charges for all classes of repairs executed. An addition of 10 per cent, will be charged for spares or material supplied. ' Fuel and lubricants will be charged for as follows :— Aviation spirit M.T. spirit Castrol .. B.B. (heavy) B.B. (medium) Caster oil s. d. I 10- 10 ii f Per 8aUony exclusive of 4 4 1 containers 8. iJ V n. Accommodation will be charged for at the rate of 4s. per night for officers' quarters, or 2s. 6d. per night if accommo- dated as non-commissioned officers. (Notice to Airmen No. 63.) Royal Navy Wireless Direction-Finding Stations AIRCRAFT may use the Wireless Direction-Finding Stations operated by the Royal Navy, under the conditions laid down for the use of these stations by the Mercantile 624
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