154 AIRCRAFT ENGINEERIN G May, 1938 Instruction s to Ground Engineers and Private Owner s on Essential Modifications whiting. The crack will be shown by oil No . 4 of the year 1938 2. This type of drum was originally fitted to all Cataract I and II, all Cataract III, except oozing through the whiting. 1. Jointings for use in the fuel, oil or water Nos. 716 to 726, inclusive, and all Niagara 1 an d (3) Fit the new steel stiffening plate, Part systems of civil aircraft must be of an approved I I engines. No. 10,N.2641, on the front of the rear type. Ultimately, such jointings will be cover. The plate fits over the main holding- required to conform to a Civil Specification 3. During the overhaul at constructors' which is now in course of preparation. In the down bolt and under the two adjacent inlet works, a strengthened type of drum, Part No. meantime, a list of the various types of jointings S. 141.1 has been fitted in a number of engines. elbows. In order to allow for the thickness a t present approved is given below. of the plate, the inlet elbows must be 4. The drum, Part No. S.141, must be reduced in section. The engine constructors replaced by drum, Part No. S.141.1 or S. 141.2 : APPROVED JOINTINGS will supply two inlet elbows, suitably (1) At the next complete overhaul of the Type Remarks Manufacturer reduced, with each stiffening plate. The Black "C" .. Suitable for washers Ronald Trist & Co., above mentioned engines, or old elbows should be returned to the engine for filler caps of 3, Brixton Road, (2) at the renewal of the Certificates of Glycol header London, S.W.9. constructors. tanks, Airworthiness of an aeroplane embodying Dexite .. .. Suitable for hydrau- Dexine Ltd., 107, (4) Treated paper gaskets must be fitted on these engines, lic mechanisms. Abbey Lane, both sides of the plate under the inlet Stratford, E.15. whichever is the sooner. Ethoid .. .. Suitable for hydrau- Nash & Thompson elbow, to ensure a gas-tight joint. lic mechanisms. Ltd., Oakcroft 5. Further particulars of the drum and of (5) Using the 17/64-in . hol e in the plate as a jig, Road, Tolworth, th e special bolts required will be supplied on Surrey. a hole of the same size must be drilled Gaco .. .. Suitable for oil and Geo. Angus & Co., application to Messrs. Pobjoy Airmotors and fuel systems. Ltd., 7, Bury in the rear cover, and its edges carefully Aircraft Ltd., Rochester, Kent. Street, London, rounded. A ¼-in. bolt, pen-steel washer, E.C.3. 6. Certificates of Airworthiness of any air Gaskoid .. Suitable for petrol J. Walker & Co., spring washer and nut (supplied by the and oil systems. Ltd., Lion Works, craft fitted with engines of the types referred engine constructors) arc to be fitted in Woking. t o in this Notice will be liable to suspension or Hallite Red For use where not Hall & Hall, Ltd., th e hole, the space between the casting cancellation in the event of failure to comply Jointing. in contact with Oldfield Works, and the steel plate being filled with washers petrol. Hampton, Middle with the above requirements by the time and shims as required; all are to be fitted sex, loco "A " Steam Suitable for fuel and loco Rubber Co., approved in paragraph 4, and after that time, as shown on Arrangement Drawing No. Packing. oil systems. Ltd., Vickers ground engineers must not sign Daily 10.N.265S. House, Broadway, London, S.W.1. Certificates of Safety for Flight in respect of 5. If the cover is cracked, and the crack Laugile Cork Suitable for fuel, oil Cork Manufacturing such aircraft, unless the modifications have Jointing. and water sys- Co., Ltd., Langile extends to or beyond the radial web, the cover been satisfactorily carried out. lems. When used Works, South must be rejected immediately. The new in water systems, Chingford, E.4. March 17, 1938. it must he coated patter n rear cover, Part No. 10,N. 1726.1, with seaplane which may be identified by the presence of varnish to B.S. Specification X.17. No . 6 of the year 1938 three webs running radially from the bolt boss Oakenstrong .. Suitable for petrol, Harold Jackson to the body, must be fitted in its place. With oil and water Ltd., Oakenelough 1. Cases have occurred in service with systems. Paper Mills, (jar- this cover, no stiffening plate is required. Pobjoy "Niagara" III engines of a crack- stang, nr. Preston. P.76 .. .. Suitable for oil sys- Technical Rubber 6. At complete overhaul of these engines, developing in the rim of the main rear cover terns. Co., Ltd., 4, uncracked rear covers must be provided with casting just above the boss of the bottom left Gloucester Road, Loudon, N.W.1. engine support bolt. This cover, Part No. th e stiffening plate. Cracked rear covers, even P.79 .. .. Rubber joints for Technical Rubber N.301.2, may be identified by the presence if already reinforced by the stiffening plate, fuel and oil sys- Co., Ltd., 4, terms. Gloucester Road, of a single web running radially from the above mus t be replaced by the new type cover, Part London, N.W.1. mentioned boss to the body of the casing. No. 10.N.1726.1. Petrosist G.T. . . Suitable for fuel and Technical Rubber oil systems. Co., Ltd., 4, Approximately parallel to this web, and about 7. Unless the instructions given in this Gloucester Road, 1-½ in. above it, is another web running from London, N.W.I. Notice have been carried out, the Certificate Petrolite .. Suitable for fuel and Hall & Hall, Ltd., the rim of the cover to the main body. The of Airworthiness of any aircraft affected will oil systems. Oldfield Works, crack has been found to start in the edge of Hampton, Middle be liable to suspension or cancellation, Certifi sex. the rim between the boss and the second web, cates of Airworthiness will not be renewed, and Resista . . .. Suitable for fuel and Hertfordshire and gradually extend clockwise around the oil systems. Rubber Co., ground engineers must not sign Daily Certifi Letehworth , boss until it meets the web joining the boss cates of Safety for Flight. Herts. and the main body. March 24. 1938. 2. Any of the jointing liquids referred to in 2. All engines mus t be examined immediately th e following list may be used with any of the to sec whether the rear covers are cracked. approved jointings, other than Langite jointing No . 7 of the year 1938 3. All aircraft embodying "Niagara" III for water systems, with which seaplane varnish Civil Specification Memorandum No. 11 engines th e rear covers of which are not cracked, to B.S, Specification X.17 must be used. 1. Amendment List No. 2 to the April, 1937, may be flown until the engines are due for edition of Air Publication 1208 is now available. JOINTING LIQUIDS complete overhaul. Until complete overhaul Copies of this can be obtained, price 4d. net Type Manufacturer has been carried out, careful inspection of or 5d. post free, either direct from His Majesty's Heldite Held Glue & Compound, Ltd., Hrent- the area around the boss of the bottom left ford, Middlesex. Stationery Office at any of the following engine support bolt must be carried out every Hernetitc .. .. Kenilworth Manufacturing Co., Ltd., addresses : Adastral House, Kingsway, London, Yiewslev, Middlesex. 25 hours. Holdfast .. .. Automotive Spares, Ltd., 50A, Overdale W.C.2 ; 120, George Street, Edinburgh, 2; Road, Haling, W.5. 4. If a crack has already developed in the 26, York Street, Manchester, 1; 1, St. Andrew's Jelfrevs Liquid Marine Alfred Jeffrey & Co., Marsh Gate, cover, but does not extend as far as the web Glue. Stratford, E.15. Crescent, Cardiff; 80, Chichester Street, Bel Nelite Nelite Ltd., Bootle, Liverpool. running radially from the boss to the body, the fast ; or through any bookseller. Stag Blacklock & Macarthur, 161-173, West following modification must be carried out Street, Glasgow, C.5. Unit Unit Manufacturing Co., Hadleigh. 2. The dates of application of the new anp immediately. It is not necessary to remove revised requirements are given in the Amend th e engine from the aircraft. Cancellation ment List. (1) Remove cylinders Nos. 4 and 5, and their Notice to Aircraft Owners and Ground 3. Cancellation.—Notice to Aircraft Owners lower inlet elbows. Engineers No. 30/1937 is hereby cancelled. and Ground Engineers No. 1/1938 is hereby Januar y 27, 1938. (2) Drill a ¼-in . hol e slightly ahead of th e visible cancelled. end of the crack. It is important that the No . 5 of the year 1938 edges of the hole should be well rounded. 4. Firms authorised to certify compliance with After cleaning the area affected with 1. Instances have occurred of a crack Civil Specifications must acknowledge receipt of developing at the root of the dogs of the paraffin, the path of the crack may be this Notice on the enclosed form. airscrew drum, Par t No. S.141. traced by painting the part over-night with March 25, 1938.
Aircraft Engineering and Aerospace Technology – Emerald Publishing
Published: May 1, 1938