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Air Ministry Official Notices

Air Ministry Official Notices Instructions to Aircraft Owners and Ground Engineers Including Important Cancellations No . 24 of the year 1931 replacements must be manufactured and in­ ments in connection with any aircraft in respect. spected to approved drawings. of which a Certificate of Airworthiness has been A case has occurred in which a fatal accident Certification of any repair affecting the safety issued. These certifications are to be made in was attributed to a Sutton harness becoming of an aircraft under paragraph 55, sub­ th e aeroplane or engine log book as the case unfastened during flight as th e result of bending section 2 of the Air Navigation Directions, 1930 may require. of the two-pronged safety pin, and its subse­ (A.N.D. 10), should not be made unless either Revised log books, in which the actual work of quent failure to hold the release pin in place. (a) the replacement par t has been approved certification is rendered easier by the printing In the case of all aircraft in which a Sutton by the makers of the aircraft; on each page of the wording of the certificate, harness is fitted, as complying with the re­ (b) the part has been manufactured and are now available, and may be purchased direct quirements of A.N.D. 10, para. 59 (1) (i) (a), inspected to standard approved drawings from H.M. Stationery Office, at Adastral House, immediate steps should be taken to replace Kingsway, London, W.C.2, Edinburgh, Man­ (approved repair schemes issued by certain the two-pronged safety pin by th e three-pronged chester, Cardiff or Belfast, or through any book­ makers coming under this head) or type. seller, price 2s. 6d. net. (c) the repair has been approved as a The parts necessary for this conversion are "modification subsequent to the issue of a Where it is desired to use the old type of log given hereunder, and may be obtained from Certificate of Airworthiness" under the book, the certification may be facilitated by Messrs. Mills Equipment Company, Limited, procedure described in paragragh 34 of having the formal wording of the required Victoria Street, Westminster:— A.N.D. 10. certificate written or stamped at the bottom Safety pin, t o Drawing No. : A.D. 9745/1. of each page. It will then only be necessary, The existence of an inspection stamp is not, Lanyard, to Drawing No. : A.D. 9745/2. when signing for work requiring certification, in itself, sufficient evidence of approval of Release pin, t o Drawing No. : A.D. 9426/1. to make reference to th e certificate a t the bottom materials, details or components; Release Screw, to Drawing No. : A.D. 9426/2. of the page. Notes and/or Certificates of Material Tests are No Certificate of Airworthiness will be re­ also required, and these documents should be Whichever method is adopted, the certifica­ newed unless the above modification has been held available for examination when the air­ tion should be such tha t it clearly meets all the satisfactorily incorporated. craft is next re-inspected for the renewal of the requirements of A.N.D. 10, paragrap h 55. It is April 7, 1931. Certificate of Airworthiness. essential that full details of the work should be No . 25 of the year 1931 entered in the log book, and that the entries Ground Engineers licensed only in categories "A " and "C " are reminded that they are not should be correlated clearly. A line should be I t has been found that there is a possibility empowered to certify repairs or overhauls. ruled across both pages of the log book under of the bottom front spar locking-bolt, part an y certificate in such fashion as will indicate CANCELLATION.—Notices to Aircraft No. H.18988 of D.H. 60 X. G. & M. "Moth " tha t repairs, for instance, were done following Owners and Ground Engineers, Nos. 7 of 1922, aircraft, failing to engage fully the rear lug of a particular flight. Subsequent flights should the fuselage fitting. This results in a tendency 21 of 1929, and 1 of 1930 are hereby cancelled. be recorded under this line. for the bolt to ride forward on the taper April 13, 1931. under load. The person signing the certificate must No . 27 of the year 1931 All aircraft of the above type are to be always state not only his name, but also his The following precautions should be observed examined in order to verify that the parallel designation, e.g. in the case of a ground when using "Petroflex " tubing :— portion of the locking-bolt passes right through engineer, his licence number and category, and (i) The ends of piping or connections to be the rear lug. in the case of a representative of an approved joined by means of "Petroflex" should be inspection organisation, the name of the firm If the bolt does not fit correctly this may be parallel, with sharp edges removed. on whose behalf he is acting, and the reference due t o the rear lug of the bracket carrying the (ii) Pipes should enter the short lengths of number of the Air Ministry Authority. locking-bolt having become bent forward. "Petroflex " up to the first corrugation, but Should it prove impossible to rectify the trouble The correct maintenance of a log book no further. by bending the bracket, a new locking-bolt of record of the life of a machine is of service to the (iii) On no account must the lining of the the same overall length, but with shorter taper owner when the aircraft is submitted for re­ tubing be stretched or contracted by attempt­ end, is to be fitted. newal of its Certificate of Airworthiness. If ing to fit it to connections of a size other than full particulars are given of all replacements or The modified locking-bolts, par t No. H . 18988, tha t for which it was manufactured. repairs and all abnormal occurrences, and if the Issue 9, can be obtained from The de Havilland (iv) Ends of "Petroflex " joints should be Aircraft Co., Ltd., Stag Lane Aerodrome, necessary certificates are properly entered, the slightly bell-mouthed (to the extent of Edgware, Middlesex. inspection for the purpose of renewal is greatly approximately 1/16 in.) in order to prevent facilitated; if, on the other hand, it is found April 9, 1931. the lining from being forced back or injured tha t work has been done for which no certifica­ when assembling. No . 26 of the year 1931 tion exists, it may be necessary to withhold the (v) Care should be taken not to twist or The attention of Aircraft Owners and Ground renewal of the Certificate of Airworthiness. disarrange the tubing during assembly. Engineers is drawn to the fact that cases have CANCELLATIONS.—Notices to Aircraft (vi) Gold size may be applied to the con­ occurred where Owners and Ground Engineers, Nos. 4 of 1930 nections before fitting the tubing, as this (a) defective parts had been replaced by and 20 of 1930, are hereby cancelled. facilitates assembly, and makes a good joint. parts manufactured without reference to April 15, 1931. On no account, however, should soft soap or drawings, the defective part being used as a No . 29 of the year 1931 oil be used as a lubricant for this purpose. pattern, or I t has been found that there is a possibility (vii) Tubing must be securely fixed by (b) details or components - for which no of the keeper on the quick release pin securing means of approved hose clips. certificate of inspection could be produced th e control stick in the bottom socket of the (viii) "Petroflex" must not be used in had been embodied in an aircraft in respect Avro Avian, all types, being placed in such a either water or lubricating oil systems. of which a Certificate of Airworthiness was position that it limits the forward movement (ix) "Petroflex" tubing should be stored current or had been applied for. In the of the control stick. in a dry place. latter cases, parts had been obtained from This quick release pin has now been modified, The use of internally unarmoured" Petro­ surplus stocks thrown up by the Royal Air th e length of th e tail portion of the keeper being flex" tubing in aircraft is not permitted. Force, or from various sources other than the reduced to ⅜ in. from the centre line of the CANCELLATION.—Notices to Aircraft manufacturer. pivo t pin. Owners and Ground Engineers Nos. 3 of 1922 In circumstances such as those referred to The pins on all aircraft of the above type and 2 of 1925 are hereby cancelled. above, there is considerable risk of the new should be examined, and if the tail portion of April 13, 1931. part being made t o incorrect dimensions and/or th e keeper is longer than ⅜ in. it should be of incorrect materials. filed down. No . 28 of the year 1931 In every case where it is necessary to manu­ A blue print of this quick release pin— The Air Navigation Directions, 1930 (A.N.D. facture any detail or component of an aircraft SS961/2—can be obtained from Messrs. A.V. 10), paragraph 55, requires the certification in for which a Certificate of Airworthiness has been Roe & Co., Ltd., Newton Heath, Manchester. th e prescribed form, by qualified persons, of all issued or is to be issued or renewed, such overhauls, repairs, modifications or replace­ May 2, 1931. 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 3 (7): 1 – Jul 1, 1931

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0002-2667
DOI
10.1108/eb029426
Publisher site
See Article on Publisher Site

Abstract

Instructions to Aircraft Owners and Ground Engineers Including Important Cancellations No . 24 of the year 1931 replacements must be manufactured and in­ ments in connection with any aircraft in respect. spected to approved drawings. of which a Certificate of Airworthiness has been A case has occurred in which a fatal accident Certification of any repair affecting the safety issued. These certifications are to be made in was attributed to a Sutton harness becoming of an aircraft under paragraph 55, sub­ th e aeroplane or engine log book as the case unfastened during flight as th e result of bending section 2 of the Air Navigation Directions, 1930 may require. of the two-pronged safety pin, and its subse­ (A.N.D. 10), should not be made unless either Revised log books, in which the actual work of quent failure to hold the release pin in place. (a) the replacement par t has been approved certification is rendered easier by the printing In the case of all aircraft in which a Sutton by the makers of the aircraft; on each page of the wording of the certificate, harness is fitted, as complying with the re­ (b) the part has been manufactured and are now available, and may be purchased direct quirements of A.N.D. 10, para. 59 (1) (i) (a), inspected to standard approved drawings from H.M. Stationery Office, at Adastral House, immediate steps should be taken to replace Kingsway, London, W.C.2, Edinburgh, Man­ (approved repair schemes issued by certain the two-pronged safety pin by th e three-pronged chester, Cardiff or Belfast, or through any book­ makers coming under this head) or type. seller, price 2s. 6d. net. (c) the repair has been approved as a The parts necessary for this conversion are "modification subsequent to the issue of a Where it is desired to use the old type of log given hereunder, and may be obtained from Certificate of Airworthiness" under the book, the certification may be facilitated by Messrs. Mills Equipment Company, Limited, procedure described in paragragh 34 of having the formal wording of the required Victoria Street, Westminster:— A.N.D. 10. certificate written or stamped at the bottom Safety pin, t o Drawing No. : A.D. 9745/1. of each page. It will then only be necessary, The existence of an inspection stamp is not, Lanyard, to Drawing No. : A.D. 9745/2. when signing for work requiring certification, in itself, sufficient evidence of approval of Release pin, t o Drawing No. : A.D. 9426/1. to make reference to th e certificate a t the bottom materials, details or components; Release Screw, to Drawing No. : A.D. 9426/2. of the page. Notes and/or Certificates of Material Tests are No Certificate of Airworthiness will be re­ also required, and these documents should be Whichever method is adopted, the certifica­ newed unless the above modification has been held available for examination when the air­ tion should be such tha t it clearly meets all the satisfactorily incorporated. craft is next re-inspected for the renewal of the requirements of A.N.D. 10, paragrap h 55. It is April 7, 1931. Certificate of Airworthiness. essential that full details of the work should be No . 25 of the year 1931 entered in the log book, and that the entries Ground Engineers licensed only in categories "A " and "C " are reminded that they are not should be correlated clearly. A line should be I t has been found that there is a possibility empowered to certify repairs or overhauls. ruled across both pages of the log book under of the bottom front spar locking-bolt, part an y certificate in such fashion as will indicate CANCELLATION.—Notices to Aircraft No. H.18988 of D.H. 60 X. G. & M. "Moth " tha t repairs, for instance, were done following Owners and Ground Engineers, Nos. 7 of 1922, aircraft, failing to engage fully the rear lug of a particular flight. Subsequent flights should the fuselage fitting. This results in a tendency 21 of 1929, and 1 of 1930 are hereby cancelled. be recorded under this line. for the bolt to ride forward on the taper April 13, 1931. under load. The person signing the certificate must No . 27 of the year 1931 All aircraft of the above type are to be always state not only his name, but also his The following precautions should be observed examined in order to verify that the parallel designation, e.g. in the case of a ground when using "Petroflex " tubing :— portion of the locking-bolt passes right through engineer, his licence number and category, and (i) The ends of piping or connections to be the rear lug. in the case of a representative of an approved joined by means of "Petroflex" should be inspection organisation, the name of the firm If the bolt does not fit correctly this may be parallel, with sharp edges removed. on whose behalf he is acting, and the reference due t o the rear lug of the bracket carrying the (ii) Pipes should enter the short lengths of number of the Air Ministry Authority. locking-bolt having become bent forward. "Petroflex " up to the first corrugation, but Should it prove impossible to rectify the trouble The correct maintenance of a log book no further. by bending the bracket, a new locking-bolt of record of the life of a machine is of service to the (iii) On no account must the lining of the the same overall length, but with shorter taper owner when the aircraft is submitted for re­ tubing be stretched or contracted by attempt­ end, is to be fitted. newal of its Certificate of Airworthiness. If ing to fit it to connections of a size other than full particulars are given of all replacements or The modified locking-bolts, par t No. H . 18988, tha t for which it was manufactured. repairs and all abnormal occurrences, and if the Issue 9, can be obtained from The de Havilland (iv) Ends of "Petroflex " joints should be Aircraft Co., Ltd., Stag Lane Aerodrome, necessary certificates are properly entered, the slightly bell-mouthed (to the extent of Edgware, Middlesex. inspection for the purpose of renewal is greatly approximately 1/16 in.) in order to prevent facilitated; if, on the other hand, it is found April 9, 1931. the lining from being forced back or injured tha t work has been done for which no certifica­ when assembling. No . 26 of the year 1931 tion exists, it may be necessary to withhold the (v) Care should be taken not to twist or The attention of Aircraft Owners and Ground renewal of the Certificate of Airworthiness. disarrange the tubing during assembly. Engineers is drawn to the fact that cases have CANCELLATIONS.—Notices to Aircraft (vi) Gold size may be applied to the con­ occurred where Owners and Ground Engineers, Nos. 4 of 1930 nections before fitting the tubing, as this (a) defective parts had been replaced by and 20 of 1930, are hereby cancelled. facilitates assembly, and makes a good joint. parts manufactured without reference to April 15, 1931. On no account, however, should soft soap or drawings, the defective part being used as a No . 29 of the year 1931 oil be used as a lubricant for this purpose. pattern, or I t has been found that there is a possibility (vii) Tubing must be securely fixed by (b) details or components - for which no of the keeper on the quick release pin securing means of approved hose clips. certificate of inspection could be produced th e control stick in the bottom socket of the (viii) "Petroflex" must not be used in had been embodied in an aircraft in respect Avro Avian, all types, being placed in such a either water or lubricating oil systems. of which a Certificate of Airworthiness was position that it limits the forward movement (ix) "Petroflex" tubing should be stored current or had been applied for. In the of the control stick. in a dry place. latter cases, parts had been obtained from This quick release pin has now been modified, The use of internally unarmoured" Petro­ surplus stocks thrown up by the Royal Air th e length of th e tail portion of the keeper being flex" tubing in aircraft is not permitted. Force, or from various sources other than the reduced to ⅜ in. from the centre line of the CANCELLATION.—Notices to Aircraft manufacturer. pivo t pin. Owners and Ground Engineers Nos. 3 of 1922 In circumstances such as those referred to The pins on all aircraft of the above type and 2 of 1925 are hereby cancelled. above, there is considerable risk of the new should be examined, and if the tail portion of April 13, 1931. part being made t o incorrect dimensions and/or th e keeper is longer than ⅜ in. it should be of incorrect materials. filed down. No . 28 of the year 1931 In every case where it is necessary to manu­ A blue print of this quick release pin— The Air Navigation Directions, 1930 (A.N.D. facture any detail or component of an aircraft SS961/2—can be obtained from Messrs. A.V. 10), paragraph 55, requires the certification in for which a Certificate of Airworthiness has been Roe & Co., Ltd., Newton Heath, Manchester. th e prescribed form, by qualified persons, of all issued or is to be issued or renewed, such overhauls, repairs, modifications or replace­ May 2, 1931.

Journal

Aircraft Engineering and Aerospace TechnologyEmerald Publishing

Published: Jul 1, 1931

There are no references for this article.