November , 1933 AIRCRAFT ENGINEERING 275 Instructions to Aeroplane Owners and Ground Engineers on Essential Modifications No . 40 of the year 1933 No . 41 of the year 1933 Notice No. 40 of 1933—Corrigendum. A case has occurred of failure of the rubber- Para. (2), line 4.—Amend "mild steel to Special care is necessary when carrying out canvas air reservoir for a pneumatically Specification S.2 " to read "mild steel to rigging adjustments to the tail plane of the operated wheel brake system. To safeguard Specification S.3." D.H.84, Dragon, aeroplane. against the possibility of similar trouble, or September 11, 1933. I n order to ensure that the tail plane bracing at least to restrict damage occurring in the wires will be adequately tensioned for the whole event of a cylinder bursting, one of the follow No . 43 of the year 1933 range of the tail plane incidence, the procedure ing alternative courses is to be adopted:— detailed below is to be followed. Airscrews to the undermentioned designs (a) To fit a protective wrapper round the have been approved for certain types of aero The tail plane is to be set in the neutral reservoir; plane, and additions should be made to the position as determined from the indicator (6) To replace the rubber-canvas reservoir adjacent to the tail plane adjuster wheel and all appropriate Notices to Aircraft Owners and by a Palmer metal braided rubber-canvas external bracing wires adjusted to the normal Ground Engineers as follows:— reservoir. tension. The bottom rear bracing wires are (c) To lit a Mark II Steel Cylinder in place the n to be given an extra half turn. Drawin g No. Remarks of the rubber-canvas reservoir. Care must be taken to ensure tha t the wiring An approved protective wrapper may be plates on the rear spar of the tail plane taking made up as follows:— (i) Add the following design to Notice No. 6 the external bracing wires are free to swivel on A tube should be made up from 22-gauge of 1931:— the fixing bolt. Duralumin to Specification L.3, or mild steel September 1, 1933. Avian IV Aircraft. to Specification S.3, of such a diameter as to (H)—WIT H HERMES II ENGINES. be a sliding fit over the reservoir when the No . 42 of the year 1933 Z.196 .. .. 1 6·72 4·33 _ latte r is inflated to 100 lb. per sq. in. pressure. Instances have occurred of splitting of The longitudinal joint should be of lap type (ii) Add the following design to Notice No. 9 wooden airscrews for Gipsy II, III and Major with two rows of ⅛ in. diameter rivets at of 1931:— ½ in. pitch, the two rows being ½ in. distant engines in the region of the boss owing to the Bluebird IV Aircraft. from one another with the rivets staggered. transmission of part of the airscrew torque by (D)—WIT H HERMES II ENGINE. The rows of rivets should be not less than th e hub bolts instead of entirely by friction at J in. from the raw edges of the plate. All the rear boss face. I386 (blade) .. — 6·89 Adjust- Blades to bo removed 1387 (blade rootabl e after each 50 hours rivets should be countersunk on the inside Wooden airscrews which are or have been fitting)Hying for inspection of the tube in contact with the reservoir. in use on these engines are immediately to be 1452 (hub) .. of blades and hub. removed from the hubs and examined for signs The tube ends should be serrated to a depth (iii) Add the following designs to Notice of fracture of the boss, particularly at the rear of 1½ in. with a pitch of ¾ in. and radiused No. 11 of 1931:— face in the region of the bolt holes. ⅛ in. top and bottom. After fitting the (D.H.60M) Moth Aircraft. Any such airscrews showing signs of cylinder over the reservoir the teeth of the (C)—WIT H GIPSY II ENGINE. fracture are to be regarded as unserviceable. serrations should be bent over to locate the D.H.5232/ A .. — 6·5 5·1 _ When assembling serviceable airscrews reservoir lengthways, the serrations engaging and hubs, care must be taken to ensure that (D)—WIT H GIPSY III ENGINE. against the metal end plates of the reservoir. D.H.5220/ H .. — 6·33 4·92 — the hub bolt nuts are adequately tightened The above modification must be incorporated before being locked. In order to maintain in all aircraft tha t are affected within six months (iv) Add the following designs to Notice th e friction drive, the tightness of these nuts of the date of this Notice in order that the No. 12 of 1931:— is to be checked periodically and any slackness Certificate of Airworthiness of the aircraft shall (D.H.GOG) Moth Aircraft. found is to be taken up. With airscrews in remain valid. Certificates of Airworthiness will (B)—WIT H GIPSY II ENGINE. frequent use, this periodical check should be not be renewed and ground engineers must not D.H .5232/A .. — 6·5 5·1 — made a t the end of every 25 hours flying, while sign Daily Certificates for such aircraft after the (C)—WIT H GIPSY III ENGINE. in the case of new airscrews the tightness of expiration of the aforementioned period unless D.H.5220/ H .. — 6·33 4·92 — th e nuts should be verified during the first the modification has been correctly embodied. September 23, 1933. 10 hours flying. August 26, 1933. Ethylen e Glycol: Imperial Chemical Indus The following list of contracts placed by the Air Ministry Contracts tries Ltd., London, S.W.—Helmets, Flame Air Ministry during August are taken from the proof : Siebe Gorman & Co., Ltd., London, September issue of The Ministry of Labour S.E.—Hose , Canvas: Wm. Rose Hose Co., Gazette:— Ltd., Salford; Raven Hose & Belting Co., Ltd., Lens : Barr & Stroud, Ltd.-, Glasgow.— Aircraft : Armstrong Whitworth Aircraft, Bradford.—Linen Fabric Strip: Falls Flax Camera , Spares: Thornton Pickard Manu Ltd., Coventry; Bristol Aeroplane Co., Ltd., Spinning Co., Ltd., Belfast.—Mahogany: Jas. Bristol; Fairey Aviation Co., Ltd., Hayes, facturing Co., Ltd., Altrincham.—Cartridges: Latham , Ltd., London, E.C.—Moulds and Middlesex; Vickers (Aviation), Ltd., Wey- Imperial Chemical Industries, Ltd., London, Mouldings : Berry Wiggins & Co., Ltd., S.W. — Crossley Six - Wheelers, Second bridge; Short Bros. (Rochester & Bedford), London, E.—Parachute and Spares : Irving hand : Race Course Betting Control Board, Ltd., Rochester.—Aircraft, Float Under Air Chute of Great Britain, Ltd., Letchworth.— London, S.W.—Cylinders: Walter Kidde Co., carriages : Short Bros. (Rochester & Bedford), Rangefinders : R. B. Pullin & Co., Ltd., Hanwell.—Design Work for Mayo Compo Ltd., Rochester.—Aircraft, Floats, Re London, W.—Recording Equipment (Mar- sit e Aircraft: Short Bros. Rochester & Bed design : Hawker Aircraft, Ltd., Kingston-on- coni-Stille) : Marconi's Wireless Telegraph ford, Ltd., Rochester.—Eclipse Inertia Thames.—Aircraft, Spares: Airscrew Co., Co., London, W.C.—Shoes, Canvas : Dunlop Ltd., Weybridge; Bristol Aeroplane Co., Ltd., Starters : Rotax, Ltd., London, N.W.— Rubbe r Co., Ltd., London, W.C.—Soda, Bristol; Fairey Aviation Co., Ltd., Hayes, Ename l Boiler: Houseman & Thompson, Caustic : Imperial Chemical Industries, Ltd., Middlesex; Vickers (Aviation), Ltd., Wey Ltd., Newcastle-on-Tyne.—Engines, Aero: London, S.W.—Steam Coal, Milton : Peake Armstrong Siddeley Motors, Ltd., Coventry; bridge; Westland Aircraft Works, Yeovil.— Oliver & Peake, Ltd., London, E.C—Ther Rolls Royce, Ltd., Derby; Trost Bros., Ltd , Accumulators : Peto & Radford, London, mometers : Negretti & Zambra, London, London, S.W.—Engines, Aero, Modifica S.W.—Automatic Controls and Spares: E.C.—Torpedoes , Dummy : Whitehead Tor tio n : Bristol Aeroplane Co., Ltd., Bristol — R. B. Pullin & Co., Ltd., London, W.—Bomb pedo Co., Ltd., Weymouth.—Wheels, Aero : Engines , Aero , Research : Bristol Aeroplane Boxes: I.C.I. Metals , Ltd. , Witton , Birmingham; Palmer Tyre, Ltd., London, W.C.—Wheels, Co., Ltd., Bristol—Engines, Aero, Spares Vickers-Armstrongs, Ltd., Dartford.—Bombs, Aero , and Tyres : Goodyear Tyre and Rubber Practice, Repairs and Filling of: Vickers- and Development Test : D. Napier & Son, Co., London, S.W. Armstrongs, Ltd., London, S.W.—Camera Ltd., London, W. ; Rolls Royce, Ltd., Derby.—
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Nov 1, 1933
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