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Aviation History
1921
1921 - 0158.PDF
MARCH 3, 1921 NOTICES TO AIRMEN Aerodromes for Civil Use : Amendment NOTICE to Airmen No. 1 of 1921 (Aerodromes lor Civil Use : Consolidated List) is amended as follows:—LIST C. Licensed Civil Aerodromes. Nuneaton aerodrome should be deleted. Pilots' Licences : Compulsory Examination in Navigation CORRECTION to No. 13 of 1921 :— Please delete words " (para. 3 (2) ) " in the fourth line of the first paragraph. Wireless Direction Finding-Stations : Organisation and Procedure IT is notified that the following D.F. Stations are avail- able for use by aircraft, and are classified by countries :— ^British Isles.—Station, Amlwch (call signal, BXV) and Rhyl (BZW) ; Berwick (BVG) ; Carnsore (BVZ) ; Croydon (GED) ; Flamborough (BVN) ; Lizard (BVY) ; Malin Head (GMH) and Seaview (BXK). France.—Station, Barre de l'Adour (call signal, FEU) ; Ben Negro (FUA and FUB); Bernieres (FEB); Berre (FED); Bizerte (FUB); Brest-Moulin du Seigneur (FEI); Casablanca D.F. (CNP); Cherbourg (FUC); Djidjelli (FEJ); Gris-Nez (FEN); Guipavas (FEG); Kenitra (CNK); Lorient (FUN); Ouessant (FFU); Penmarcl (FEP); Point du Raz (FER); St. Nazaire (FEZ); Sfax (FUS); Soubise (FES); Toulon- Li berte (FUT), and Treguier (FET). Germany.—Station, Borkum (call signal FNR); List (VBD); Nordholz (MNF); and Wilhemshaven (KAN). Italy.—Station, Murano (call signal IRM). Radio-telephony enables aircraft equipped with the accessary apparatus to communicate with one another in the air or to speak to ground stations at any point in their journey. The subjects o! converse are for the present to be restricted to the following : a) bearings, whereabouts, etc.; (b) weather (cloud, visibility, etc.); (c) landing conditions; and (d) unforeseen occurrences, such as forced landings, requests for assistance, etc. Authority.—Admiralty Notices to Mariners, Nos. 2031 of 1920, 2127 of 1920, and 190 of 1921 ; French Bulletin de la Navigation Aerienne, No. 9, December, 1920. Cancellations.—Notice to Airmen, No. 107 of 1920, and Paragraph 4 of Notice to Airmen, No. 98 of 1920, are hereby cancelled. (No. 17 of 1921). Signposts for Airmen : Aerodromes, etc., Marked A 1. WITH reference to Notices to Airmen, Nos. 4 of 1920 and 15 of 1921, the names of the under-mentioned aerodromes are marked as follows :— A • In chalk letters on the ground : Andover, Biggin Hill,Bircham Newton, Croydon, Digby, Donibristle, Eastchurch, Farnborough, Gosport, Grain, Halton, Hawkinge, Henlow,Kenley, Leuohars, Lympne, Manston, Martlesham Heath, Netheravon, Orfordness, Shotwick, Smoogroo, Spittlegate,Stonehenge, Upavon and Worthy Down. JS. /» white letters on the roofs of the sheds : Cranwell,Freiston, and Spittlegate. 2. The airship base at " Howden " has the name markedin chalk letters on the ground. 3. The stores depot near Watford Junction has the name" Watford " marked in chalk letters on the ground. 4. Due notification will be given if other aerodromes,airship bases, or depots are marked. (No. 20 of 1921). Radio Telephony : Stations Available for Aircraft ; Organisation and Procedure THE following radio-telephony stations are available for use by aircraft, and are classified by countries :— British Isles.—Stations, Castle Bromwich (call sign GEC) ; Croydon (GED) ; Didsbury (GEM) ; Lympne (GEG) ; Pulham (GEP) ; Renfrew (GER). Conversations by radio-telephony must be as brief as possible, and are to be confined for the present to the following subjects :— (a) Whereabouts of aircraft. (b) Weather conditions. (c) Landing conditions. (d) Unforeseen occurrences such as forced landings, requests for assistance, etc. Belgium.—Station, Haren (call sign, BAV). France.—Station, Le Bourget (call sign ZM) ; St. Inglevert (AM). ' Holland.—Station, Soesterbert (call sign STB). (No. 21 of 1921.) Howden : Flying of Kite Balloons WITH reference to Notice to Airmen No. 85 of 1920 pilots are also warned that, in order to assist airships landing in thick weather, a kite balloon will be flown, when necessary, from the landing ground at Howden Airship Station, 17 miles S.E. of York (Lat. 530 47' o" N., Long. o° 52' o" W.) (No. 22 of 1921.) Lympne Aerodrome : Cloud and Visibility Signals1. THE following system of ground signals is in operation at Lympne Aerodrome, to denote to pilots the height of cloudsabove and visibilitv at Biggin Hill and Croydon Aerodromes. 2. The stations are denoted by letters :—B (representingBiggin Hill), and C (representing Croydon). The height of clouds and visibility are indicated by numerals. Allsignals are white. 3. Height of clouds are denoted by the following numerals :1 = o to 200 ft. ; 2 = From 200 to 500 ft. ; 3 = From 500 to 1,000 ft. ; 4 = Above 1,000 ft.These signals represent the height of clouds above the respective aerodromes and not above sea level. 4. Visibility will be shown in a similar way, viz., 1 = Below 500 yards ; 2 = 500 to 1,000 yards ; 3 = 1,000 yards to 2,000 yards ; 4 = Above 2,000 yards. 5. The signals are always displayed in the following order :— 1. Station. 2. Height of Clouds. 3. Visibility, e.g., B.1.2; or C.2.3. 6. The signals are situated approximately 30 yards east of the Office of the Civil Aviation Traffic Officer, and 140 yards west of the Compass Base. They are so placed as to be read the right way up when flying in a north-westerly direction. 7. Cancellation.—Notice to Airmen No. 90 of 1920 i> cancelled as from March 1, 1921. (No. 24 of 1921.) NOTICES TO GROUND ENGINEERS Correction IT should be noted that :— 1. " No. 18 of the year 1921 " should read " No. 1 of the year 1921." 2. "No. 19 of the year 1921 " should read "No. 2 of the year 1921." Le Rhone Engines (80 h.p. and 110 h.p.) : Weak ValveRocker Support THE original type of valve rocker support or Tee piecefitted to earlier engines of the above types has been found to be weak to an extent which renders the engine unairworthyunless fitted with safety clips of sheet steel to Air Ministry Drawing No. A.B. 3634. Such clips must, therefore, be fitted in all cases where theabove type of valve rocker support is fitted. In fitting these clips care must be taken to ensure that the holes for the pinsthrough the fins on the cylinder heads are drilled in such a manner as to prevent the clips tearing away. The defective type of Tee piece in some cases has beenfurther weakened by the drilling of a tommy-bar hole at right angles to the housing of the horizontal bearing, and inall cases may be readily recognised, as the vertical stems are tapered instead of parallel. This type should be replaced at the first opportunty by theEnglish type, which has a parallel vertical stem drilled with ;i 10-mm. hole. (No. 4 of 1921.) ' Dual Control in Passenger Aircraft " 1 "^1. EXPERIENCE having shown that the presence inpassenger-carrying aircraft of dual control, which can be interfered with by passengers, is a source of danger, it lwbeen decided that the daily certificate required from a grouml engineer will be held to have been given improperly in caseswhere an aircraft fitted with dual control is used for passenger carrying without proper arrangements being made for theprevention of interference with the dual control. 2. Suitable protection can be given by removing the controllever and by the provision of a suitable cover which will allow for the movement of the dual rudder bar, control link andcables, and by adequately protecting or disconnecting the dual ignition and engine controls. 158"
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