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February, 1932 AIRCRAFT ENGINEERING 53 Instruction s to Aircraft Owners and Ground Engineers Regardin g Essential Modifications No . 73 of the year 1931 600 hours running, or have been in service for No . 68 of the year 1931 more than two years, should be replaced The forward movement of the control sticks is Contains additions to the lists of approved airscrew immediately . limited by the operating lever on the elevator designs given in Nos. 6, 9, 13, 15 and 54, 1931. Certificates of Airworthiness will not be issued or striking the rearmost cross tube of the fuselage renewed in respect of aircraft fitted with engines a t the stern post, in the case of metal Avro Avians. no t complying with these requirements. On wooden Avians with the rear stick removed, No . 69 of the year 1931 Notice No. 60 of 1931 is cancelled. th e bottom edge of the elevator spar forms the stop. Airscrews to the following designs have been Novembe r 28, 1931. A modification incorporating a check cable approved for use on Cierva Autogiro C.24 aircraft attache d to the fuselage frame and the elevator with Gipsy III engine:— rocking lever, has accordingly been introduced in No . 76 of th e yea r 1931 Diamete r Pitch order to provide a definite stop to the control in feet Drawin g No. in feet Attentio n is draw n to Jagua r Modification No. 478 66330A/X 1 7·0 4·69 sticks. covering an alteration to the needle valve seating 66330A/X 2 7·0 5·03 Copies of these Avian Modifications, No. 103 an d the addition of a bracket to the float lever of November 17, 1931. (Metal Fuselage) and No. 104 (Wooden Fuselage), th e A.V.T. 70, 70E and 70G type carburettors ma y be obtained from Messrs. A. V. Roc & Co., fitted to Jaguar engines. The changes have been No . 70 of the year 1931 Ltd. , Newton Heath, Manchester. effected in order to minimise the risk of the needle Th e Certificate of Airworthiness of an aircraft valv e sticking in the closed position. Airscrews to the following designs have been affected by this modification shall be liable to approved for use on B.S.S.1 Monospar aircraft with The bracket, Part No. C.H. 13695, is bifurcated suspension or cancellation if th e abov e modification Salmson A.D.9 engine:— t o fit over the neck, or smallest diameter, of the has not been incorporated within six months Issue Diamete r Pitc h needle valve, an d is attache d to th e upper face of the from the date of this Notice. Certificates of Air Drawin g No. No . in feet in feet float lever by a 4.B.A. screw, A.G.S.246, locked by Z.241 .. .. 3 4·82 3·41 worthiness will not be renewed and Ground En lightly riveting over the projecting end of the Z.278 .. .. 1 4·82 3·8 gineers must not sign Daily Certificates for such threade d portion. November 17, 1931. aircraft after the expiration of the aforementioned To accommodate the bracket, the needle valve period unless the modification has been correctly seating must be shortened at the guide end by embodied. No . 71 of the year 1931 9 mm., the circlip, Part No. C.H. 13666, being Novembe r 24, 1931. rendered redundant. Care must be taken to ensure Airscrews to the following designs have been that: — approved for use on Comper "Swift " Aircraft:— No . 74 of the year 1931 (a) burrs arc removed. Issu e Diamete r Pitch Drawin g No. No . Remark s in feet in feet I t is desired to draw the attention of all con (b) the seating is no t distorted during the work (A)—WIT H SCOKPION II ENGINE. cerned to the fact that the fitting of wing tip flares of modification and assembly. 1 4·75 3·61 Throttling neces- Z.197 .. .. to civil aircraft for which a Certificate of Air (c) the seating is properly locked into the body. 4·66 3·15 sary in level Z.124 .. .. 1 56250A/X1 . . 5·0 3·71 flight at low worthiness has been granted or is required, consti (d) the clearance between the guide portion of 3·1 altitudes. 56250A/X 2 .. 5·0 — tute s a modification, in respect of which th e usual th e seating and the needle valve, permits a 56250A/X 3 .. 5·0 3·29 application must be made to th e Secretary (C.A.2), narro w 0.0015 in. feeler to be inserted. S6250A/X 4 .. 5·0 3·49 Air Ministry, Adastral House, Kingsway, W.C.2, I t is necessary to turn the carburettor upside (B)—WIT H SALMSON A.D.9 ENGINE. down when engaging the modified float lever with an d full particulars of the proposed installation Z.160 .. .. 1 5·44 4·43 th e needle valve. mus t be forwarded to the Airworthiness Depart 2 5·44 4·1 Z.160 .. .. ment , Royal Aircraft Establishment, Farnborough, Whe n re-assembling the float chamber, a check (C)—WIT H POBJOY "P" ENGINE. in accordance with paragraphs 33 and 34 of mus t be mad e t o ensure tha t there is a t least 1/16 in. Z.220 .. .. 1 6·4 6·75 A.N.D . 10. clearance between the float chamber and the sides 6·4 6·89 Z.220 .. .. 2 Particular s of all existing installations of wing of th e float a t all positions in th e swing of th e float. (D)—WIT H POBJOY "R " ENGINE. Wher e the clearance is insufficient, minor irregulari ti p flares are to be submitted to the Airworthiness Z.271 .. .. 1 6·5 8·52 ties in the casting should bo removed and/or the Department , R.A.E., forthwith, giving details of Z.271 .. .. 3 6·5 8·8 3 Z.271 .. .. 4 6·5 8·97 transvers e position of th e float adjusted by means of th e following items:— a thin brass washer fitted to the fulcrum pin. Novembe r 17, 1931. (a) Type of flare bracket. Th e alteration and addition required by this (b) Method of attachment of bracket to plane. Notice must be effected at the next overhaul. All No . 72 of the yea r 1931 (c) Type and size of cables. future issues of carburettors supplied with engines, (d) Type of press button. Examinatio n boards will sit for the purpose of or a s spares, will have th e modification incorporated. (e) Type of master switch. examining applicants for ground engineers' licences Th e engine log book should be endorsed to Th e Certificate of Airworthiness of any aircraft a t the following times and places:— show: — affected shall be liable t o suspension or cancellation (a) London, on the first, second, third, and (a) that th e modification has been incorporated. if approval of such wing tip flare installations has fourth Wednesdays in every month. no t been obtained within three months from the (b) tha t the checking required by paragraph (4) (b) Croydon, on the second and fourth Fridays dat e of this Notice. Certificates of Airworthiness of this Notice has been carried out. in every month. will not be renewed or new Certificates of Air December 9, 1931. (c) Manchester, on the first Wednesday in worthiness granted for aircraft fitted with wing January , March, and May. ti p flares unless and until the installation of such No . 77 of th e yea r 1931 (d) Bristol, on the first Wednesday in February, equipmen t has been approved. April, and June. Attentio n is drawn to the fact that the require Novembe r 26, 1931. Applications for licences should be made on ment s of paragraph 1, Design Leaflet C.7, Air the appropriate form, which is obtainable on re Publication 1208, will be brought into effect in No . 75 of the year 1931 quest, and should be addressed to the Secretary, respect of all applications for Certificates of Air Air Ministry (C.A.2), Adastral House, Kingsway, Gipsy I engines prior to Number 1007 were worthiness as follows:— London, W.C.2. Applications for extensions to originally fitted with connecting rods (Part No. (a) Applications for Type Certificates of Air existing licences will also be dealt with at these 800-10) having two holes drilled in the underside worthiness as from the date of issue of this boards, and such applications should be sent by of the small end which converge into one hole Notice. letter to th e address given above, giving particulars where they enter the gudgeon pin bore. (b) Applications for subsequent Certificates of of recent experience in respect of the extension I t has been found by experience that cracks are Airworthiness after November 1, 1932. required, together with the fee of 5s., and stating liable to develop at the point where these holes (c) Applications for renewals of Certificates of th e centre a t which the applicant wishes to sit. meet, and as a consequence the maximum safe Airworthiness after November 1, 1933. Applications for examination at Manchester and life of these rods has been fixed at 600 hours. Th e requirements of paragraph 1, Design Leaflet Bristol can only be accepted provided that the I n rods of later manufacture, the holes in question C.7, Air Publication 1208, ar e a s follows:— application is received 14 days before the dates ar e approximately 11 mm . apart where they enter "1 . General.—Engines installed in aircraft of specified, and provided also tha t the total number th e gudgeon pin bore. th e Normal and Acrobatic Categories, sub of applications received is within the capacity of Earl y type rods should normally be replaced by divisions (a), (b), (c) and (e), must be fitted with th e board. Applicants whose applications arc thos e of later manufacture on the occasion of dual ignition. not accepted owing to these provisions will be th e first complete overhaul. In the case of engines Note.—Dual ignition is defined as the provision given the opportunity either for early examination which hav e already been overhauled, th e rod s should for each cylinder of two separate systems or a t London or Croydon, or, alternatively, to be b e replaced on th e completion of 600 hours running ignition which shall be independent (except for placed on a waiting list for the next board to be or, alternatively, where evidence of the time run th e actual engine drive), so that the failure of arranged in the particular place concerned. is not available, they should be replaced within one shall not directly affect the functioning of the tw o years of the date of the engine being put in Notice No. 23 of 1931 is cancelled. second. " November 21, 1931. t o service. Rods which have already completed December 9, 1931.
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: Feb 1, 1932
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