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Aviation History
1931
1931 - 0952.PDF
FLIGHT, SEPTEMBER 4, 1931 plans for further work of thesame character will be described. Learning to Fly THE Automobile Associationhave recently prepared an interesting little pamphlet on thesubject of learning to fly. It is primarily intended for thosemembers who wish to obtain a pilot's " A " licence. The firstpart of the booklet deals with the regulations at present in force,and tells the reader in a brief manner just what he has tocomply with. The second part is a well-arranged list of most of theimportant flying clubs, giving such details as their rates, sub-scriptions, aircraft available, and the best method of getting to theclub. Copies of this very handy publication may be had free upon•application to the Automobile Association, Fanum House,Coventry Street, London, W.I. or any of their branch offices. THE PREMIER IN GERMANY: A short time ago Mr. Ramsay MacDonald visited Berlin by air, and our photograph shows him getting into the FaireyIII.F. (Lion) at Tempelhof for the return flight. <$> <•> AIR MINISTRY NOTICES AIR MINISTRY NOTICE TO AIRMEN, SERIES A No. 48 of 1931. Cranbrook Air Light : Altered Period. (817810/38.j A notification that (1) The experimental alteration in the period of theCranbrook air light is terminated. On and after the night of August 13-14, 1931, the period and characteristics of this light will be as shown in The AirPilot, Vol. I, page 37. These are as follow : — Period.—7 sec. Characteristics.—light 0-1 sec. ; eclipse () -5 sec. Light 0-1 sec. ; eclipse 0-5 sec. Light 0-1 sec. ; eclipse 5-7 sec. No. 51 of 1931. Schneider Trophy Contest : Restriction of Flying.(128573 31.) Flight in the neighbourhood of the Schneider Trophy Contest will besubject to the following restriction :— During the period from 24.00 hr. B.S.T. on September 11, 1931, to24.00 hr. B.S.T. on September 25, 1931, or to 24.00 hr. B.S.T. on the day on which the Schneider Trophy Contest is completed, whichever is theearlier, no aircraft other than aircraft competing in the Contest may fly over the following area : — The area enclosed by straight lines drawn from Yarmouth Pier toLymiugton Pier and thence to Netley Castle ; by the line of high water between Netley Castle and Hamble Spit; by straight lines drawnfrom Hamble Spit to Horsea Wireless Telegraphy Station, thence to Baffins Pond, and thence to Havant Railway Station ; by the railwayline between Havant Railway Station and Chichester Railway Station ; by straight lines drawn from Chichester Railway Station to Selsey Bill,theuce to Culver Down Wireless Telegraphy Station, and thence to Egypt Point Lighthouse; and by the line of high water between EgyptPoint Lighthouse and Yarmouth Pier. N.B.—In this connection it should be noted that the term aircraft includesgliders, kites and fixed balloons. it should be observed that Cowes seaplane station, which was notified inNotice to Airmen Series A No. 46 of 1931 as available for use by visiting marine aircraft, lies within the prohibited area described above. Aircraftdesiring to use. this seaplane station must, therefore, arrive before the com- mencement of the period of prohibition as denned above, and will not befree to depart until the expiration of the period. NOTICES TO GROUND ENGINEERSNo. 41 of 1931 A Modification to the Blackburn Bluebird, IV 2.N.96 (60,361/30),A modification to the Blackburn Bluebird, IV/2.N.96 (60,361/30), has been introduced to reinforce the top longerons in the cockpit bay. Thismodification is the fitting ot 2 B.A. tie rods along the top longerons between the dashboard bulkhead and the bulkhead aft the cockpit. The forwardlongeron attachment fitting part No. N.A. 108 is replaced by part No. N.A. 248. The above modification must be incorporated in all aircraft affectedwithin three mouths from August 6 in order that the C. of A. of the aircraft shall remain valid. No. 42 of 1931. Simmonds' Spartan two- and three-seater aircraftwith Clark YH wings : Modifications to wings and ailerons. (114655 31.) As cases of vibration have occurred on Spartan two- and three-seateraircraft fitted with Clark YH wings, the following modifications are to be embodied :—On the top plane, aileron is to be deleted and the trailing edgeextended to the wing tip. The rear spar is to be increased in both by means of spruce laminations top and bottom and a modified rib attachment toDrawing No. S.K. 360, Issue A. In the bottom plane, the rear spar is to be increased as in the top and the rib attachment also modified to Drawing No.S.K.3S9, Issue C. The aileron is now to be fitted to the bottom plane only and the horn balance deleted. The span is increased to 8 ft. 7f in. to DrawingNo. S.K. 364, Issue A. These modifications must be incorporated in all aircraft that are affected within two months of the date of this notice inorder that certificates of airworthiness may remain valid. Until the afore- mentioned modifications are carried out, C. of A.'s are restricted to normalcategory flying. This does not apply to Spartan " Arrow " aircraft or to Simmonds' Spartan two- and three-seater aircraft of symmetrical-sectionwings. No. 43 of the year 1931. Westland "Widgeon " Aircraft : FlyingControls. (60361,30.) Attention is drawn to Modification Widgeon. 14, Flying Controls (adjustabletype rudder bar foot rests strengthened). Should the outside of one of the present adjustable rudder bar foot restsbecome seriously distorted in service, there is a possibility of it jamming against the side bracing member of the fuselage. The above-mentioned modification arranges for strengthening angle brackets to be fitted to bothsides of the foot rests, in order to avoid this possibility. The above modification must be incorporated in all aircraft that are affectedwithin six months of the date of this Notice in order that the C.'s of A. of the aircraft shall remain valid.The necessary new parts can be obtained on application to : — The Westland Aircraft Works. Yeovil. Som. (August 17, 1931.) No. 44 of the year 1931. Cirrus Hermes Engines. (95424,31.)The nomenclature shown below has been adopted for Cirrus Hermes engines with the object of defining the various series.Mark I Cirrus Hermes:—Upright type having wet sump lubrication. Rated power—B.H.P. (normal) 104 at 1,900 r.p.m.Mark I engines altered to incorporate Modifications H.M. 109, auxiliary cylinder lubrication, piston scraper rings, and H.M. 112, strengthenedexhaust valves, in accordance with Notice to Aircraft Owners and Ground Engineers No. 38 of 1931, which have been marked " Mod. Mark II," andare fitted with full skirted pistons together with a Claudel Hobson A.V.48.D. carburettor, may have the rated power altered to the following : —B.H.P. (normal) 106/110 at 2,000 r.p.m. The engine name plate and log book should be amended accordingly.Mark II Cirrus Hermes—Upright type, wet sump lubrication. As Mark I, except for incorporation of the modifications listed below.Original rating—B.H.P. (normal) 104 at 1,900 r.p.m. Modifications :—Auxiliary cylinder lubrication (Mod. No. H.M. 109).Fully skirted pistons. Piston scraper rings. Strengthened type exhaust valves (Mod. No. H.M. 112). Claudel Hobson A.V.48D. carburettor.Mark II engines embodying the modifications listed in sub-paragraph (ii) may have the rated power altered as follows :—B.H.P. (normal) 106/110 at2,000 r.p.m. The engine name plate and log book should be amended accordingly.Mark II.B. Cirrus Hermes—Inverted engine (dry sump). This engine incorporates the essential features of the Mk. II, but is designedto run as an inverted engine. The rating is as follows :—B.H.P. (normal) 104 at 1,900 r.p.m. (August 26, 1931.) No. 45 of the year 1931. Plywood in Main Structural Members(126324 31). Cases have occurred where three-ply in built-up spars and other importantstructural members has buckled, and the glued joints have become affected. The attention of all concerned is drawn to the necessity for periodicalexaminations for these defects. Certificates of Airworthiness will not be renewed, and Ground Engineersmust not sign Daily Certificates for aircraft in which there are parts with these defects. (August 28, 1931.) No. 46 of the year 1931. Blackburn Bluebird Mk. IV Aircraft : TopSternpost Joint. (60361/30.) It is hereby notified that :—Cases have occurred of the raised flange,which secures the sternpost to the top longeron, bending and cracking in way of the taper pin. This fitting should therefore be inspected after every25 hours' flying for signs of failure. A Modification No. N.S.I has been prepared which incorporates a redesignedsternpost fitting and duralumin end plugs for the longerons, particulars ot which, together with the necessary parts, may be obtained from the BlackburnAeroplane and Motor Co., Brough, E. Yorks. This modification must be ncorporated in all aircraft that are affected within six months of the dateof this Notice in order that the Certificate of Airworthiness of the aircraft shall remain valid-Notice to Aircraft Owners and Ground Engineers No. 22 of 1931 is hereby cancelled. (August 31, 1931.) No. 47 of the year 1931. Blackburn Bluebird Mk. IV Aircraft: RadiusRod Eyebolt. (60361/30.) Cases have occurred of the eyebolt securing the radius rod to the axle,cracking at the flange ; this eye bolt should therefore be inspected afterf^ery 10 hours' flying for signs of cracking. A redesigned part, No. N.A.7(WU, isobtainable from the Blackburn Aeroplane and Motor Co., Brough, E. Yortcs. In order to fit this, it is necessary to increase slightly the counter boring onthe axle forging. This modification must be incorporated in all aircraii that are affected within three months of the date of this Notice in order thatthe Certificate of Airworthiness of the aircraft shall remain valid. Notice to Aircraft Owners and Ground Engineers No. 32 of 1931 is nereo> cancelled. . „„, v (August 31, 1931.) 890
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