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Air Ministry Official Notices

Air Ministry Official Notices 130 AIRCRAFT ENGINEERING May, 1932 Instruction s to Aircraft Owners and Groun d Engineers Regarding Essential Modifications No . 3 of th e yea r 193 2 no t require periodic cleaning more frequently than Th e modification is shown on drawin g No. M.1741 once in every 100 flying hours. Certain early issued b y th e de Havillan d Aircraft Co., Ltd., Stag Instances have occurred of transverse fatigue generators , the serial numbers of which are given Lane Aerodrome, Edgware, Middlesex. failure of th e blad e sheet of Fairey-Reed airscrews below, were, however, fitted with silver commuta­ An alternative modification to drawings Nos . fitted with metal hub blocks, the fractures com­ tors , the dust from which necessitates cleaning after M.1732 and M.1725 or M.1732 and M.1734 has mencing a t th e holes for th e hu b bolts or th e tubular ever y 50 hours running. alread y been incorporated in the following air­ bolts securing the metal blocks, and extending Steps are being taken to replac e these silver com­ craft :— towards th e leading and trailing edges. An instance mutator s with others made from a special alloy, Constructor' s Nos. 2203, 2216, 2218 to 2226. has also occurred of transverse fatigue failure bu t until this modification has been completed, Th e Certificates of Airworthiness of Puss Moth commencing from the identification stamping. regular observations of th e generators concerned aircraft, other tha n those detailed in para . (3) above, As th e result of thes e failures, it is necessary that, should be made , in order to ensure that they ar e shall be liable to suspension or cancellation if th e in future, frequent inspection of thes e airscrews in cleaned after every 50 hours' running, or eve n more modification referred to in para . (2) ha s no t been the vicinity of the hu b blocks and identification frequently if an y sign of eriatic behaviour of th e incorporated within four months of the date of stamping be made. indicatin g instruments is recorded . thi s Notice. After the expiratio n of tha t period, The blade sheet must be carefully examined on Th e serial numbers of th e generator s fitted with Certificates of Airworthiness will not b e renewed both sides in th e above-mentione d regions. Where silver commutators are as follows: — an d ground engineers must not sign Daily Certi­ metal hub blocks are fitted, both sides of th e blade 1-63, 70-72, 74, 76-83 , 97-100, 102, 123, 126, ficates in respect of th e aircraft concerned unless th e sheet visible through the lightening holes must also 127, 132, an d 137. modification has been correctly embodied. be examined. Fo r the purpose of cleaning the commutators, (B) For this purpose, airscrews must be removed from th e seal must be broken and th e bakelite cap Th e following paragraph should be added to their hubs, and spinners, where fitted, remove d from unscrewed. The actua l cleaning out of th e com­ Notice to Aircraft Owners and Groun d Engineers the airscrews. In no circumstances , however, ma y mutato r slots is bes t done b y means of a toothbrush . No. 45 of th e yea r 1930:— the hub blocks be remove d from the airscrew. Thi s operation must be carried out wit h extreme Alternativ e t o th e repair shown on drawin g No. Airscrews on which any signs of fracture are care, owing t o th e very delicate nature of th e brush M.1533, quoted in thi s Notice, the V bracin g tubes observed, must be removed from the aircraf t an d gear an d electrical connection, an d should preferably ma y be replaced by heavier tubes in accordance the matter reported. be carried out in a workshop. wit h drawing No. M.1736 issued b y th e do Havilland Januar y 23, 1932. Februar y 27, 1932. Aircraft Co., Ltd . This modification can, if desired, b e applied to an y Puss Moth aircraft with the type No . 4 of th e yea r 193 2 No . 6 of th e yea r 1932 of roof bracing in question. Wit h reference t o Notice s t o Aircraf t Owners and March 21, 1932. Wit h reference to paragraph 2 of Notice to Ground Engineers Nos. 26 of th e year 1929 and 19 Aircraft Owners and Ground Engineers No. 7 of of th e year 1930, owners of aircraft with rotary 1927, air intakes for Avro 504.N. aircraft with engines who have not arranged for th e modification Lyn x Mk. I V engin e t o th e following drawings ar e of such aircraft by having a fireproof bulkhead No . 8 of th e yea r 193 2 acceptable: — fitted in accordance with the terms of Leaflet D.2. O. 1258 introduce d by Modification No. 504 N/ S Wit h reference to paragraph 4 of Section A of of th e Airworthiness Handbook for Civil Aircraft, (non-heated type). Notice to Aircraft Owners and Ground Engineers A.P . 1208, are further warned tha t the relaxation in O. 1495 introduced by Modification No. 504 N/5 7 No . 7 of th e year 1932, i t ha s been decided tha t the regar d to this requirement ceased to have effect (heated type). modification called for b y tha t Notice should be after December 20, 1931, and that , consequent­ incorporate d before April 21, 1932. Th e Certifi­ Copies of the above drawings may be obtained ly, Certificates of Airworthiness for such air­ cate s of Airworthines s of th e D.H.8o A, Puss Moth from Messrs. A. V. Roc & Co. Ltd., Newton Heath, craft can no longer be renewed unless and until aircraft concerned will be liable to suspension or Manchester. th e modification in question has been carried out . cancellation if th e modification referred to ha s no t March 10, 1932. Ful l information with regard to th e suitability of been incorporated by tha t date, and thereafter an y proposed bulkhead can be obtaine d on applica­ Certificates of Airworthiness will not b e renewed No . 7 of th e yea r 193 2 tio n to the Airworthiness Department, Royal an d ground engineers must not sign Daily Certi­ (A) Aircraft Establishment, South Farnborough, Hants. ficates in respect of such aircraft unless th e modi ­ I t has been found tha t the front lift strut of th e Februar y 24, 1931. fication has been correctly embodied. D.H.80A Puss Moth aircraft requires strengthening t o resist down loads which may be experienced in Pendin g the incorporation of th e modification No . 5 of th e yea r 1932. exceptionally severe weather conditions. referred to above, it is recommended that th e air Whe n the " Record " electric revolution indicator A modification has accordingly been introduced t o speed of th e Pus s Moth aircraft concerned should wa s approved for use on civil aircraft, it wa s strengthe n the front lift strut by preventin g latera. be restricted to 105 m.p.h. anticipate d that the generator commutators would failure and reinforcing the to p en d of the stru t March 30, 1932. Recent Technical Developments interested to hear tha t the first aeroplane engines TH E TELEVEL PETROL GAUGE JIGS , TOOL S AND MACHININ G WORK of many well known makes were manufactured by Th e Monk Engineering Co., Ltd., of High Street, Th e following is a n amende d description of th e thi s firm. Coventry, concentrate on th e making of jigs, tools, lates t type of Televel fuel contents gauge, th e an d special fixtures for th e workshops of engineers paragrap h describing which, on pag e 108 of ou r last FORGING S AND STAMPING S an d machine makers, and are in a position t o make issue, was incorrect in som e particulars. ji g fixtures and tools to increase and accelerate A representative of AIRCRAFT ENGINEERING Th e float is alway s resting on th e fuel surface but production. As Mr. Handasyde's articles in is not in th e ordinar y sense a float indicator, th e recentl y visited th e work s of th e Midlan d Forging AIRCRAF T ENGINEERING have shown, th e outstand­ readin g being taken mechanically, not registered Co., Ltd., of Selly Oak, Birmingham, when he was in g feature of th e best modern engineering practice, automatically . The pilot only obtains a reading struc k by their very complete and up-to-date in th e aircraf t as in othe r industries, is th e use of of th e level of th e fuel in th e tan k when he requires equipment . jigs for repetition work. it. When he wishes to know th e level , he rotate s The y possess a very fine die sinking plant and a th e face of th e dial on th e instrumen t board down I n addition t o th e jig, tool, and fixture side of th e thoroughl y up-to-date heat treating department. business, the Monk Engineering Company also th e scale. This action is communicated through Th e capacity of th e plan t (in which th e American hav e a department in which the highest class of a Bowden wire to a plunger which, when it comes boar d hammer is used) ranges from articles of 2 oz. machining is carrie d out, bot h of a genera l character in contact with a wheel mounted on th e float, u p t o 22 lb. in weight, and it is propose d shortly t o an d of special types. In these shops parts are automaticall y locks the float by tilting slightly, instal additional hammers enabling this firm to machined to a high degree of accuracy and finish. an d stops further movement of th e Bowden cable. produc e articles of a much larger size. Th e amount of fuel in th e tan k is then read off Th e firm also undertakes all kinds of experi­ Amongs t the firms whom stampings have been menta l work ; among th e matters dealt with being directly on th e dial, which is calibrated for th e supplied to ar e D . Napie r & Son Ltd., and Armstrong size and shape of th e tank. work in connection with aero-engines. We ar c Siddeley Motors Ltd. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aircraft Engineering and Aerospace Technology Emerald Publishing

Air Ministry Official Notices

Aircraft Engineering and Aerospace Technology , Volume 4 (5): 1 – May 1, 1932

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Emerald Publishing
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Copyright © Emerald Group Publishing Limited
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0002-2667
DOI
10.1108/eb029549
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Abstract

130 AIRCRAFT ENGINEERING May, 1932 Instruction s to Aircraft Owners and Groun d Engineers Regarding Essential Modifications No . 3 of th e yea r 193 2 no t require periodic cleaning more frequently than Th e modification is shown on drawin g No. M.1741 once in every 100 flying hours. Certain early issued b y th e de Havillan d Aircraft Co., Ltd., Stag Instances have occurred of transverse fatigue generators , the serial numbers of which are given Lane Aerodrome, Edgware, Middlesex. failure of th e blad e sheet of Fairey-Reed airscrews below, were, however, fitted with silver commuta­ An alternative modification to drawings Nos . fitted with metal hub blocks, the fractures com­ tors , the dust from which necessitates cleaning after M.1732 and M.1725 or M.1732 and M.1734 has mencing a t th e holes for th e hu b bolts or th e tubular ever y 50 hours running. alread y been incorporated in the following air­ bolts securing the metal blocks, and extending Steps are being taken to replac e these silver com­ craft :— towards th e leading and trailing edges. An instance mutator s with others made from a special alloy, Constructor' s Nos. 2203, 2216, 2218 to 2226. has also occurred of transverse fatigue failure bu t until this modification has been completed, Th e Certificates of Airworthiness of Puss Moth commencing from the identification stamping. regular observations of th e generators concerned aircraft, other tha n those detailed in para . (3) above, As th e result of thes e failures, it is necessary that, should be made , in order to ensure that they ar e shall be liable to suspension or cancellation if th e in future, frequent inspection of thes e airscrews in cleaned after every 50 hours' running, or eve n more modification referred to in para . (2) ha s no t been the vicinity of the hu b blocks and identification frequently if an y sign of eriatic behaviour of th e incorporated within four months of the date of stamping be made. indicatin g instruments is recorded . thi s Notice. After the expiratio n of tha t period, The blade sheet must be carefully examined on Th e serial numbers of th e generator s fitted with Certificates of Airworthiness will not b e renewed both sides in th e above-mentione d regions. Where silver commutators are as follows: — an d ground engineers must not sign Daily Certi­ metal hub blocks are fitted, both sides of th e blade 1-63, 70-72, 74, 76-83 , 97-100, 102, 123, 126, ficates in respect of th e aircraft concerned unless th e sheet visible through the lightening holes must also 127, 132, an d 137. modification has been correctly embodied. be examined. Fo r the purpose of cleaning the commutators, (B) For this purpose, airscrews must be removed from th e seal must be broken and th e bakelite cap Th e following paragraph should be added to their hubs, and spinners, where fitted, remove d from unscrewed. The actua l cleaning out of th e com­ Notice to Aircraft Owners and Groun d Engineers the airscrews. In no circumstances , however, ma y mutato r slots is bes t done b y means of a toothbrush . No. 45 of th e yea r 1930:— the hub blocks be remove d from the airscrew. Thi s operation must be carried out wit h extreme Alternativ e t o th e repair shown on drawin g No. Airscrews on which any signs of fracture are care, owing t o th e very delicate nature of th e brush M.1533, quoted in thi s Notice, the V bracin g tubes observed, must be removed from the aircraf t an d gear an d electrical connection, an d should preferably ma y be replaced by heavier tubes in accordance the matter reported. be carried out in a workshop. wit h drawing No. M.1736 issued b y th e do Havilland Januar y 23, 1932. Februar y 27, 1932. Aircraft Co., Ltd . This modification can, if desired, b e applied to an y Puss Moth aircraft with the type No . 4 of th e yea r 193 2 No . 6 of th e yea r 1932 of roof bracing in question. Wit h reference t o Notice s t o Aircraf t Owners and March 21, 1932. Wit h reference to paragraph 2 of Notice to Ground Engineers Nos. 26 of th e year 1929 and 19 Aircraft Owners and Ground Engineers No. 7 of of th e year 1930, owners of aircraft with rotary 1927, air intakes for Avro 504.N. aircraft with engines who have not arranged for th e modification Lyn x Mk. I V engin e t o th e following drawings ar e of such aircraft by having a fireproof bulkhead No . 8 of th e yea r 193 2 acceptable: — fitted in accordance with the terms of Leaflet D.2. O. 1258 introduce d by Modification No. 504 N/ S Wit h reference to paragraph 4 of Section A of of th e Airworthiness Handbook for Civil Aircraft, (non-heated type). Notice to Aircraft Owners and Ground Engineers A.P . 1208, are further warned tha t the relaxation in O. 1495 introduced by Modification No. 504 N/5 7 No . 7 of th e year 1932, i t ha s been decided tha t the regar d to this requirement ceased to have effect (heated type). modification called for b y tha t Notice should be after December 20, 1931, and that , consequent­ incorporate d before April 21, 1932. Th e Certifi­ Copies of the above drawings may be obtained ly, Certificates of Airworthiness for such air­ cate s of Airworthines s of th e D.H.8o A, Puss Moth from Messrs. A. V. Roc & Co. Ltd., Newton Heath, craft can no longer be renewed unless and until aircraft concerned will be liable to suspension or Manchester. th e modification in question has been carried out . cancellation if th e modification referred to ha s no t March 10, 1932. Ful l information with regard to th e suitability of been incorporated by tha t date, and thereafter an y proposed bulkhead can be obtaine d on applica­ Certificates of Airworthiness will not b e renewed No . 7 of th e yea r 193 2 tio n to the Airworthiness Department, Royal an d ground engineers must not sign Daily Certi­ (A) Aircraft Establishment, South Farnborough, Hants. ficates in respect of such aircraft unless th e modi ­ I t has been found tha t the front lift strut of th e Februar y 24, 1931. fication has been correctly embodied. D.H.80A Puss Moth aircraft requires strengthening t o resist down loads which may be experienced in Pendin g the incorporation of th e modification No . 5 of th e yea r 1932. exceptionally severe weather conditions. referred to above, it is recommended that th e air Whe n the " Record " electric revolution indicator A modification has accordingly been introduced t o speed of th e Pus s Moth aircraft concerned should wa s approved for use on civil aircraft, it wa s strengthe n the front lift strut by preventin g latera. be restricted to 105 m.p.h. anticipate d that the generator commutators would failure and reinforcing the to p en d of the stru t March 30, 1932. Recent Technical Developments interested to hear tha t the first aeroplane engines TH E TELEVEL PETROL GAUGE JIGS , TOOL S AND MACHININ G WORK of many well known makes were manufactured by Th e Monk Engineering Co., Ltd., of High Street, Th e following is a n amende d description of th e thi s firm. Coventry, concentrate on th e making of jigs, tools, lates t type of Televel fuel contents gauge, th e an d special fixtures for th e workshops of engineers paragrap h describing which, on pag e 108 of ou r last FORGING S AND STAMPING S an d machine makers, and are in a position t o make issue, was incorrect in som e particulars. ji g fixtures and tools to increase and accelerate A representative of AIRCRAFT ENGINEERING Th e float is alway s resting on th e fuel surface but production. As Mr. Handasyde's articles in is not in th e ordinar y sense a float indicator, th e recentl y visited th e work s of th e Midlan d Forging AIRCRAF T ENGINEERING have shown, th e outstand­ readin g being taken mechanically, not registered Co., Ltd., of Selly Oak, Birmingham, when he was in g feature of th e best modern engineering practice, automatically . The pilot only obtains a reading struc k by their very complete and up-to-date in th e aircraf t as in othe r industries, is th e use of of th e level of th e fuel in th e tan k when he requires equipment . jigs for repetition work. it. When he wishes to know th e level , he rotate s The y possess a very fine die sinking plant and a th e face of th e dial on th e instrumen t board down I n addition t o th e jig, tool, and fixture side of th e thoroughl y up-to-date heat treating department. business, the Monk Engineering Company also th e scale. This action is communicated through Th e capacity of th e plan t (in which th e American hav e a department in which the highest class of a Bowden wire to a plunger which, when it comes boar d hammer is used) ranges from articles of 2 oz. machining is carrie d out, bot h of a genera l character in contact with a wheel mounted on th e float, u p t o 22 lb. in weight, and it is propose d shortly t o an d of special types. In these shops parts are automaticall y locks the float by tilting slightly, instal additional hammers enabling this firm to machined to a high degree of accuracy and finish. an d stops further movement of th e Bowden cable. produc e articles of a much larger size. Th e amount of fuel in th e tan k is then read off Th e firm also undertakes all kinds of experi­ Amongs t the firms whom stampings have been menta l work ; among th e matters dealt with being directly on th e dial, which is calibrated for th e supplied to ar e D . Napie r & Son Ltd., and Armstrong size and shape of th e tank. work in connection with aero-engines. We ar c Siddeley Motors Ltd.

Journal

Aircraft Engineering and Aerospace TechnologyEmerald Publishing

Published: May 1, 1932

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