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- Publisher
- Emerald Publishing
- Copyright
- Copyright © Emerald Group Publishing Limited
- ISSN
- 0002-2667
- DOI
- 10.1108/eb029779
- Publisher site
- See Article on Publisher Site
Abstract
February , 1934 AIRCRAFT ENGINEERING 55 Instruction s to Aeroplane Owners and Ground Engineers on Essential Modifications No . 50 of the year 1933 I n order to remove these bolts for examina The following modifications shown in Messrs. tion, the following dismantling procedure is de Havilland's drawing M.2431, must be Airscrews to the following designs have been t o be carried out:— incorporated in all Fox Moth aeroplanes as approved for use on D.H. 84, Dragon, aero (i) Remove the port and starboard main soon as possible:— planes:— planes complete. (a) Addition of vertical stiffeners to the (ii) Remove the petrol tank. seat back; Pitc h Issue Diamete r Remark s Drawing No in ft. N o in ft. (iii) Slack off centre section bracing wires. (b) Fitting of spruce runner along the top (A) WITH TWO GIPSY MAJOR ENGINES. (iv) Remove centre section wood fairing. of the seat back; D.H.5212/D 5·42 6·17 The flange of each bolt is the n to be unsweated, (c) Fitting of thicker type of shield for .. — — D.H.5218/B 6·5 5·1 .. — — care being taken to confine the applied heat to seat back. D.H.5228/A 5·25 6·0 .. — — D.H.5228/B 6·0 5·12 th e bolt flange. The to p end of the bolt should Certificates of Airworthiness of aeroplanes — — 94234A/X1 6·17 5·85 .. — — be tapped to assist loosening. On re-assembly, affected will be liable to suspension or cancella 94234A/X2 6·17 5·64 .. — — 94234A/X3 6·17 5·78 it is not essential to resweat the bolts in tion, and ground engineers must not sign daily .. — — 94234A/X4 6·17 5·93 — — position, as the sweating provides for location certificates in respect of such aeroplanes, nor 94234A/X5 6·17 6·32 For tropica l climates .. — 94234A/X6 6·17 6·10 only. only. will Certificates of Airworthiness be renewed, .. — Z.1510 . 6·36 5·2 .. — — after the expiration of three months from the These bolts are to be carefully examined Airscrews to the following designs have been dat e of this Notice, unless the modifications when aeroplanes of the above types are sub approved for use on D.H. 85, Leopard Moth, specified above have been satisfactorily em mitted for revewal of their Certificates of Air aeroplanes :— bodied. worthiness, and any corroded bolts must be (A) WITH GIPSY MAJOR ENGINE. replaced by new ones. December 1, 1933. D.H.5232/A 6·5 5·1 November 20, 1933. .. — — D.H.5232/B 6·5 5·3 .. — — D.H.5234/A 5·08 6·75 No . 53 of the year 1933 .. — — 67104A/X6 7·0 5·32 No . 52 of the year 1933 .. — — 67104A/X11 7·0 5·52 A magneto coupling R/080 which gives a . — — 67104A/X12 7·0 5·18 Cases have occurred on D.H.83, Fox Moth, . — — 67104A/X13 7·0 5·39 positive drive has been developed to super . — — 84933A blades aeroplanes in which the elevator control lever 7·0 Adjustable sede the existing friction type drive on the — — 84168B hub in the forward part of the rear fuselage has Pobjoy "R " type engine. The new coupling penetrated the dome-shaped shield on the back possesses the same shock-absorbing qualities, The following amendment should be made to of the pilot's seat. This defect is caused by and eliminates the risk of slipping. Notice No. 11 of 1931 (D.H. 60M, Moth, Aero distortion of the scat back by hard usage, planes: (C) With Gipsy II Engine) and to The new type coupling should be fitted to which has the effect of pushing back the shield Notice No. 12 of 1931 (D.H. 60G, Moth, Aero bot h magnetos at, or before, the next top over on to the lever. When the seat is in sound planes: (B) With Gipsy II Engine):— haul of the engine. Messrs. Pobjoy Airmotors, condition and the controls are correctly rigged, Ltd., Hooton, Cheshire, will, on application, Airscrew to Design D.H.5232/A:—Add, in the top of the elevator control lever should be supply the part s necessary to effect the change, "Remarks " column:—"For use in tropical clear of the shield when the control column is together with instructions for fitting, which fully forward and the top of the control column climates only." must be carried out by a suitably qualified is in contact with the back face of the luggage November 16, 1933. ground engineer. locker. The pilots' seats of Fox Moth aeroplanes are Certificates of airworthiness of aircraft No . 51 of the year 1933 t o be examined immediately to ascertain affected will be liable to suspension or can Cases have occurred in which severe corrosion whether the defects described in para. (1) above cellation if the modification is not satisfac has developed on the stems of the eyebolts are present, and if any defects are found, torily incorporated within two months from the securing the petrol tank and centre section suitable repairs and adjustments are to be dat e of this Notice. Certificates of airworthi struts to the centre section spars on D.H.60X.G. made before further flying is carried out. In ness will not be renewed and ground engineers and M., Moth, aeroplanes. The bolts referred no circumstances may the shield over the must not sign daily certificates in respect of to are four in number, and are located in holes clearance hole in the back of the seat be left such aircraft after the expiration of this period, near the ends of the centre section front and off during flight. If found damaged, this shield unless the modification has been correctly rear spars, the flange of each bolt being sweated must be repaired or replaced before further embodied. to the spar. flight. December 12, 1933. Furnaces for the Nitriding Process We regret that in connection with the article used for a different process. The special type describing the various heat-treatment furnaces of Birlec nitriding furnace here illustrated has been developed to remove the objections apply manufactured by Messrs. Birmingham Electric ing to batch-type furnaces for the nitriding Furnaces, Limited, under the heading "Fur process. The figure shows clearly the manner in naces for the Nitriding Process," on pp. 16 and which a movable heating chamber is employed 17 of our January issue there appeared a photo in conjunction with fixed nitriding containers. graph of a Birlec carburising furnace which was The chamber can be seen in position over a described in error as a nitriding furnace. container undergoing treatment, the second container being exposed in the foreground for We reproduce herewith a correct photograph, unloading and re-charging. The panels carry which shows one of the special Birlec semi- ing, respectively, the automatic recording continuous batch - typ e nitriding furnaces temperature regulator and the ammonia control valves, gauges, etc., are seen against the wall referred to in the article, as installed at the on the right-hand side of the equipment with works of one of the leading manufacturers of The photograph erroneously labelled in our th e ammonia cylinders mounted near by. aero-engine parts, etc. Januar y issue illustrated a batch-type furnace
Journal
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Feb 1, 1934