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Aviation History
1924
1924 - 0675.PDF
OCTOBER 16, 1924 NOTICES TO AIRMEN Thames Estuary : Danger Area IT is notified :— 1. Artillery practice which takes place at the Yantlet and Shoeburyness ranges constitutes a danger to aircraft over an area extending across the mouth of the Thames from Yantlet (latitude 51° 28' N., longitude 0° 42' E. approx.), about three miles north-west of Sheerness, to the north-east extremity of Foulness Sand (latitude 51° 40' N., longitude 1° 5' E. approx.). The position of the ranges is shown on the appended plan. 2. Firing takes place practically every day at Shoeburyness, and/or Yantlet, including days when the clouds are low. No aircraft signal is displayed at Grain aerodrome or else where when firing is in progress, and paragraph 5 of the By-laws for the Yantlet (Grain Island) Artillery Range should be read as if modified accordingly. 3. In view of the danger to which aircraft flying over the ranges are exposed, pilots should invariably keep at a safe distance from the area. Aircraft approaching the Thames Estuary from the east and south-east should proceed to the south of the prohibited areas of Sheerness and Hoo, or if approaching from the north-east, to the north of Foulness Sand (and vice versa). 4. No liability for accidents arising to aircraft from the use of the ranges will be admitted. 5. Previous Notices.—Notice to Airmen No. 51 of 1922 is hereby cancelled. The references to Notice No. 51 of 1922 in Notices Nos. 61 and 73 of 1922 should be amended so as to refer to the present Notice. (No. 78 of 1924.) Uruguay : Ratification of the International Air Con vention. THE Government of the Republic of Uruguay having deposited its ratification of the International Air Convention on July 13, 1924, the Convention came into force for Uruguay, in respect of the Contracting States, on August 22, 1924. (No, 83 of 1924.) Changes in Visibility at Meteorological Stations on Aerial Routes 1. SPECIAL reports of changes in visibility at Croydon, Biggin Hill and Lympne will be issued when the horizontal visibility : (a) is decreasing and becomes less than 1,000 metres (or 1,100 yards) ; (b) decreases still further^andjbecomes less than 200 metres (or 220 yards) ; (c) after having been less than 200 metres (or 220 yards), improves and has become greater than 500 metres (or 550 yards) for at least 10 minutes. 2. These reports will be exhibited at the aerodromes of Croydon and Lympne, and will be communicated immediately by R/T from these aerodromes to the pilots of aircraft in flight who may be affected. 3. The reports will also be transmitted immediately by W/T to the terminal aerodromes at Amsterdam, Brussels and Paris, in the following code :— (a) The word " fog." (b) Four figures indicating the time (GMT.) at which the phenomenon was observed. (c) The name of the station in clear. (d) The first group of the abbreviated code for hourly route reports. (The first group contains the information required to complete the form in Notice to Airmen No. 80 of 1922 and also in Notice No. 138 of 1922, Part T, Section III, paragraph 4.) 4. Similar messages will be transmitted from Brussels with regard to visibility observations at the aerodromes of Haren and Ostend and at the Royal Meteorological Institute at Uccle. These messages will be exhibited at Croydon and Lympne, and when necessary will be communicated by R/T to aircraft from these stations. (No. 91 of 1921) International Aeronautical Maps : Britain 1. THE Britain General Sheet (provisional), G.S., GS. (Air) 113, of the International Aeronautical Maps, prepared in accordance with Annex F. of the International Air Con vention, is now on sale. The map is drawn on Mercator's Projection to a scale of 1 degree of longitude equals 3 centimetres. The area covered is : Latitude 47° N. to 61° N. ; longitude 14° W. to 2° E. 2. Copies of this map may be obtained through the follow ing agents (price 45. (paper) and 4s. Gd. (linen backed) ) :— London : E. Stanford, Ltd., 12, Long Acre, W.C. ; Sifton Praed and Co., Ltd., 67, St. James Street, S.W.; T. Fisher Unwin, Ltd., 1, Adelphi Terrace, W.C. Edinburgh : W. and A. K. Johnston, Ltd., Easter Road. Liverpool : Philip, Son and Nephew, 20, Church Street. (No 97 of 1924.) Rules for Flight over Air Routes IT is notified the following should be substituted for paragraphs 1 (c) and (d) of Notice to Airmen No. 42 of 1924:— " (c) When a pilot decides to follow an officially recognised route he should bear in mind that the risk of collision with another aircraft following the same route is considerable. Every pilot following such a route, therefore, shall endeavour to keep it at least 300 metres on his left. " When a pilot is following a line of ground marks such as a road, railway, canal, river, etc., not forming part of an officially recognised route, he is advised to keep such a line of ground marks to his left for a similar reason. " (d) Every pilot who decides to cross an officially recog nised route, whether he has been following it or not, shall cross it at right angles and as high as circumstances permit. " Should he desire, after crossing it, to fly in a direction parallel to the route, but keeping it on his right, he must keep sufficiently far from the route to avoid aircraft following it in the normal way. " A pilot who decides to cross a line of ground marks he is following that do not form part of an officially recognised route is advised to observe the same precautions." (No. 101 of 1924.) London-Brussels and London-Amsterdam : Officially Recognised Routes IT is notified :—• 1. The British, French, Belgian and Netherlands Govern ments have agreed that the officially recognised air route for aircraft flying along the coast between Calais, Ostend and Nieuwe Sluis Lighthouse (at the mouth of the Scheldt— Latitude 51° 24' N., Longitude 3° 30' E.) shall be the water line (i.e., the actual water line at any time). 2. The officially recognised air routes London-Brussels and London-Amsterdam are now defined as follows :— (A) London-Brussels, Southern Route. Between Croydon and Oxted—No official route ; Oxted and Folkestone—The main railway line through Edenbridge, Tonbridge and Ashford ; Folkestone and Calais—No official route ; Calais and Brussels (Haren)—The main railway line through St. Omer, Hazebrouck and Armentieres to Lille. The main road from Lille through Tournai, Ath and Hal. Note.—The Franco-Belgian frontier on the southern route must be crossed between Armentieres and Baisieux. (B) London-Brussels, Northern Route (v%a Ostend). Between Croydon and Calais—As in (A) ; Calais and Ostend—Water line (i.e., the actual water line at any time) ; Ostend and Brussels—The main railway line through Bruges, Aeltre, Ghent, Erpe and Denderleeuw. (C) London-Amsterdam. Between Croydon and Calais—As in (A) ; Calais and Nieuwe Sluis Lighthouse—Water line (i.e., the actual water line at any time) ; Nieuwe Sluis Lighthouse and Amsterdam—As stated in Notice to Airmen No. 8 of 1924, paragraph 2 (1). (No. 102 of 1924.) 675
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