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Aviation History
1931
1931 - 0348.PDF
FLIGHT, APRIL 10, 1931 AIR MINISTRY NOTICES NAVIGATIONAL WARNINGS Abbeville : Equi Signal Aural Beacon IT is hereby notified :— 1. A radio beacon of the equi-signa] aural type has been installed at Abbe- ville, as a navigational aid to aircraft flying on the Croycion-Paris route. Details of the beacon are as follow :— Name of Beacon.—Abbeville. Position.—Lat. 50'08'20"N. Long 0Ic49'3O"E. of Greenwich. (Lat. 55:'7(r99"N. Long. (W56'91" W. of Paris.) Frequency (Wavelength).—311.2 kilocycles (964 metres). Interlocking Signals.—" F " and " L." Normal range.—80 miles. Hours of Service.— 0800—1700 G.M.T. Remarks.—The morse signal F (- -) is transmitted by the beacon over a quadrant of a circle extending from 252° to 342°T, and over the reciprocal quadrant from 72° to 162°T. The morse signal L ( ) is transmitted over the supple- mentary quadrants extending from 342° to 72°T. and from 162" to'2S2°T. respectively. The great circle course of 162" from Dover via Abbeville to Le Bourget aerodrome midway between these quadrants thus forms an " equi-signal line," along which the signals F and L arc received with equal strength. The two signals then blend together or " interlock " as shown below. ami form a long sleatly note thus : 2. When flying between Dover and Abbeville, deviation to the eastward of the equi-signal line will cause the letter L to be received with greater MILES 0 10 20 JO 40 50 PARIS (LEBOURGET-DUGNY)\ Paris •strength than the letter F, and hence the signal actually received will reveal the letter L superimposed on an indefinite background. As the deviation increases, the letter L wiH become more prominent and more defined. Devia- tion to the westward of the equi-signal line will cause the letter F to be received in a similar manner. When flying between Abbeville and Le Bourget the effect will be similar but opposite, that is to say, deviation to the eastward will cause the letter F to be heard and deviation to the westward the letter L. 3. Pilots utilising this method of direction finding by wireless telegraphy should therefore so navigate their aircraft that a long steady note only is received. They will then be following the equi-signal line between Dover and Le Bourget. 4. Pilots should note that when proceeding towards Abbeville either from Dover or from Le Bourget, the letter F will indicate deviation to the right (starboard) and the letter L deviation to the left (port). When proceeding from Abbeville either towards Dover or towards Le Bourget, the rule is reversed, viz., the letter F will indicate deviation to the left (port) and the letter L deviation to the right (starboard). With practice, the amount of deviation can be estimated according to the strength with which either the letter F or L, as the case may be, is received. <$> <$> Royal Geographical Society Medals THE Royal Geographical Society, on April 1, announcedthat the King had approved the award of the following Royal Medal :—Patron's Medal, to Rear-Adm. R. E. Byrd, U.S.N.,for his expedition to the Antarctic and his nights over both North and South Poles.German Flying Boat for France THE Rohrbach-Romar triple-engined passenger flying-boat, which has been built on reparations payments, left 5. In this Notice, the expression " deviation " means deviation with respect to the equi-signal line, and has no connection with the deviations of the compass. 6. The accompanying sketch shows the orientation of the equi-signal liiv and the quadrants in which the letters F and L are transmitted. (No. 4 of 1931.1 Night Flying without Navigation Lights 1. ROYAL Air Force aircraft will be flying between 1900 and 0045 hours daily (Sundays excepted) during the period March 23 to October 30, 193], inclusive, over an area bounded by straight lines joining Stowmarket, Tenter- den, Petersfield, Newbury and Stowmarket. 2. Unless other aircraft are observed in their vicinity, the aircraft will not exhibit navigation lights when flying at certain altitudes, i.e., above 3,00" ft., with the following exceptions : (a) Above 5,000 ft. over that portion of the above-mentioned area lying between a straight line joining Croydon and Deal and a straight line joining Croydon and Dungeness. (b) Above 5,000 ft. over the area bounded by straight lines joining Chek- field, Addington, Oxted, Sevenoaks and Chelsfield. (c) Below 3,000 ft., on certain dates to be notified later, over the area bounded by straight lines joining Chelmsford, Southend-on-Sea, Dartford, Waltham Abbey and Chelmsford. 3. Cancellation. N/A Navigational Warning No. 1 of 1931 is hereby can- celled. (Navigational warning No. 6 of 1931.) AIR MINISTRY NOTICES TO AIRCRAFT OWNERS AND GROUND ENGINEERS. De Havilland Aircraft : Fireproof Bulkheads 1. With reference to Notice to Aircraft Owners and Ground Engineers No. 24 of the year 1930, a number of de Havilland aircraft of the type? D.H.60, D.H.60.X, n.H.«).G., D.H.61 and D.H.66 have been fitted with fireproof bulkheads constructed of .%- in. asbestos rivetted or bolted between 24 gauge aluminium sheet in front and 1+ mm. three-pl behind. 2. Recent tests have shown that this bulkhead is satisfactory, and it i* not necessary, therefore, to modify such bulkheads on aircraft of the abow types in order to satisfy the conditions for renewal of Certificates of Airworthi- ness. (A'o. 20 of 1931.) Jupiter Engines : Locking Crankshaft Balancing Plugs 1. An instance has occurred where the balancing plug screwed into the periphery of the crankshaft balance weight of a Jupiter engine came out because it was not locked in position. 2. Aircraft owners and ground engineers concerned should take the first opportunity to examine such engines for the security of this plug. The exarui- nation can be made quite easily by removing one cylinder and piston. 3. The correct method for locking the balancing' plug, is to peen the met.i from the balance weight into the slot in the head of the plug by means of a suitable blunt chisel or punch. Any plug found unlocked should be ftr?t checked for tightness by means of a screwdriver ; plugs already locked should also be checked, and if any slackness is found, must be tightened up .mil re-locked. 4. A note to the effect that this examination has been carried out and th.u any locking or re-locking necessary has been done, should be entered in each engine Log Book. 5. This notice will not apply to any "Jupiter" engine that leaves the makers' works subsequent to the date of issue of this notice. No. 21 o/1931.) Blackburn Bluebird Mk. IV Aircraft : Top Sternpost Joint 1. CASES have occurred of the raised flange on plate NA 507, which secures the sternpost to the top longeron, bending and cracking in way of the taper pin. 2. This fitting should therefore be inspected immediately and further inspection should be carried out at frequent intervals. 3. A Modification, No. N.S. 1, which incorporates a redesigned sternpost fitting and duralumin end plugs for the longerons, has been prepared. 4. Particulars of this modification, together with the necessary parts, may be obtained from The Blackburn Aeroplane & Motor Co., Brough, E. York*. (A'o. 22 0/ 1931.) Examination of Applicants for Ground Engineers' Licences 1. Examination boards will sit for the purpose of examining applicants tor ground engineers' licences at the following times and places :— (a) London, on the 1st. 3rd and 4th Wednesdays in every month. (b) Croydon, on the 2nd Wednesday in every month. (c) Manchester, on the 1st Wednesday in July and October. (d) Birmingham, on the 2nd Wednesday in August and 1st Wednesday in November. (i") Bristol, on the 1st Wednesday in September and December. 2. Applications for licences should be made on the appropriate form. which is obtainable on request, and should be addressed to The Secretary. Air Ministry (D.C.A.), Gwydyr House, Whitehall, London. Applications tor extensions to existing licences will also be dealt with at these boards and Sinn applications should be sent either by letter or on the usual application form to the address given above. 3. Applications for examination at the centres named at (c), (a) and ;«' of para. 1, above, can only be accepted provided that the application ••- received 14 days before the dates specified and provided also that the tou number of applications received are within the capacity of the board. Appli- cants whose applications are not accepted owing to these provisions, will <J given the opportunity for early examination at London or Croydon, e. - alternatively, to be placed on a waiting list for the next board to be arrange! in the particular place concerned. 4. Notice to Aircraft Owners and Ground Engineers No. 41 of 19J" :" hereby cancelled. — (No. 23 of 1931.) Travemund^ on April 1, with a representative of the Freru i. Air Ministry on board, for Cherbourg, where it will be officiall1 taken over by the French authorities. Japanese Air Station DestroyedTHE largest military aviation establishment at Tachiara , on the Island of Kiushim, was destroyed early on April -by a local hurricane, and 4 hangars and 19 aeroplanes we.- destroyed, while many more machines were damaged.
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