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Auxiliary Equipment

Auxiliary Equipment This record was established when West Coast Air­ lines of Seattle, U.S.A., stripped down a set of landing gear on one of their Friendship fleet. The aircraft was inspected for overhaul after completing 11,065 flying hours. Only minor details of the undercarriage assembly had to be replaced. Details of Some Components Used for Subsidiary In the light of this, it is interesting to note that 75 customers in 27 countries have ordered 242 Friend­ Services in Aircraft, Missiles and Space Vehicles ships and these aircraft are already being flown by 65 operators in 22 countries. The 218 Friendships so far delivered have logged approximately one million BARRYMOUNT SYSTEM OF MACHINE (c) To eliminate vibration and to isolate machines and flying hours. MOUNTING the floors upon which they stand from the excitatory Dowty designed and manufactured equipment on forces which have their origin in the operation of The Barrymount system of machine mounting is the Friendship, besides the main and nose under­ large numbers of machines of differing operating used extensively in the machine shops at the dc Havil- carriages, includes propellers and auxiliary gearboxes. characteristics mounted closely adjacent to each other. land Division works of Hawker Siddeley Aviation Ltd. (d) To eliminate structure-borne noise. at Portsmouth. AIRSCREW FANS Good management and good housekeeping go hand Barrymount isolating machine mounts arc manu­ in hand with efficiency in these machine shops. This factured in the U.K. by Cementation (Muffelite) Ltd., Four high-efficiency Airscrew fans arc being in­ is the immediate impression a visitor obtains and it is Hersham, Walton-on-Thames, Surrey, under licence stalled on each of the Hawker Siddeley 748 aircraft of confirmed by closer examination of the working from Barry Controls Division of the Barry Wright the Queen's Flight. arrangements. The lay-out of the machines is most Corporation. They comprise a 6 in. centrifugal forward curved carefully planned, and one of the reasons for using type unit situated under the cabin floor to the rear of this system of mounting machines is the case with MOBILE AIR COMPRESSOR the nose-wheel bay to supply conditioned air to the which whole sections of machines may be re-posi­ passenger cabin, and three 6·8 in. units, two of which An Air Partner, a mobile air compressor for start­ tioned, if and when machining operations make it for radio cooling, are located in the base of a radio ing jet engines, recently left London Airport for desirable. It is not unknown for a single machine to crate on the port side of the gangway at the entrance Fiumicino Airport, in Rome, for starting Boeing be re-positioned to suit work being done on it. to the crew compartment. Air is passed from this crate 707s and VC10s, of B.O.A.C. via an underfloor duct to a similar crate on the star­ This is easily and quickly accomplished when board side of the gangway. Barrymount isolating machine mounts are used. While a machine is absolutely stable and firmly The third unit is situated under the cabin floor near located, they arc, when these mounts arc used, virtu­ to the air conditioning fan and supplies additional air ally free-standing. The mounts rest on the floor and for radio cooling. All the fans operate at a low noise they have their own built-in levelling devices to level. facilitate re-setting up. It was this facility which led to the mounts first TROUBLE-FREE ICE PROTECTION SYSTEM being used about five years ago and since then more Over 150,000 flying hours, equivalent to 6,250 days, and more machines have been mounted on them as the of operation, have now been completed by the 67 opportunity has occurred. Subsequently, more Spraymat-applied propeller spinners fitted to the machines will be similarly mounted. The superinten­ Viscount fleets of B.E.A. and Lufthansa airlines. dent, machine shop, Mr R. Durkin, regards this Spraymat is the electrical ice protection system manu­ facility as a most important one, coupled as it is with factured by the Luton Division of D. Napier and Son the absence of any need to interfere with the floor Ltd., a member of the English Electric Group of surfaces. Companies. In addition, however, the designed function of the All the 67 spinners have attained a minimum of Barrymount system of machine mounting is to 2,000 flying hours each, while two of the 12 Spraymat 'actively' and 'passively' isolate machines from the spinners fitted to B.E.A. Viscounts for trial purposes area of the floor upon which they stand. That it so say, have exceeded 6,000 flying hours each. As the pro­ 'passive' in the sense that a machine which would be peller feathering control equipment is examined every affected adversely by external sources of vibration is The Air Partner, which can also be used for de- 100 hours as part of the routine maintenance cycle, insulated from them, and active in the sense that a icing in winter, is a safe and reliable source of power, this represents over 60 removal and refitting cycles of machine which is a source of vibration is isolated so giving a continuous flow of warm, oil-free air. It needs these particular spinners. This service record em­ that the incident of transmission to the floor upon only infrequent maintenance which can be carried out phasizes the point made by B.E.A. in their report on which it rests is reduced to a degree which renders it by airline engineers anywhere in the world. From the the trials that 'the spinners arc robust, and withstand insignificant. Air Partner the warm, compressed air passes through the normal maintenance and service handling without This can be demonstrated by a person placing his the small high-speed turbine starters geared to the any necessity for special instructions'. foot upon one of the mounts when the vibration aris­ jet or turboprop engine. The continuous air flow Lufthansa report that the Spraymat-applied spin­ ing from the operation of the machine can be felt, eliminates mis-starts. ners on their Viscounts have operated faultlessly, and but on the floor immediately alongside the machine Before being acquired by B.O.A.C. this particular they also comment on the effectiveness of Napier there is no evidence of vibration. Air Partner was used all over Great Britain and the Stoneguard, which protects the Spraymat installation The use of Barrymount isolating machine mounts Continent as a demonstration unit by Atlas Copco from stone and hail damage. The 55 Spraymat spin­ serves to interpose a barrier between a source of (Great Britain) Ltd., Maylands Avenue, Hemel ners fitted to Lufthansa's Viscount fleet were fabricated vibration, i.e. a machine, and any other mass with Hempstead, Herts, its manufacturers. by Westfalische Metall Industrie of Lippstadt, which it is in direct contact—in this context, the floor. Napier's Spraymat manufacturing licensee in Western The distinguishing feature of the design of the BURSTING DISK ASSEMBLY Germany, and they have now been in service for well Barrymount system of mounting machines is that it is over 100,000 hours. A bursting disk assembly for protecting high pres­ based on the principle of providing for a temporary Spraymat-applied spinners arc also in service in the sure gas storage vessels on aircraft from over-pressuri- storage of energy and its subsequent release, sub­ U.S.A., where they arc fitted to the Viscount aircraft zation has been developed by The Hymatic Engineering stantially in its entirety, at a time cycle which differs Co. Ltd., Redditeh, Worcs. Known as the DAB of United Airlines. from that at which the mount receives the input of 201-001, it is of particular use where systems have to energy, i.e. the frequency of excitation. be leak-tight over long periods, so overcoming the HIGH TEMPERATURE NON-RETURN VALVE Superficially, the design of a Barrymount isolating disadvantage of most relief valves when performing A non-return valve for use with gas at temperatures machine mount is a simple one. It is based on the use a similar function where a finite leakage exists. up to 250 deg. C. has been developed by The Hymatic of a moulded core of oil-resistant Neoprene which is The assembly is contained within a 1 in. B.S.P. plug Engineering Co. Ltd., Redditch, Worcs. Despite the bonded to a dished steel upper casing and a steel base and is designed to screw directly into the end of the high temperature, the valve is leak-tight in the reverse plate. The moulded form is contoured also to accom­ pressure vessel to be protected; it operates over a flow direction, requiring a pressure of only a few modate an integral steel levelling component. temperature range of minus 40 to plus 90 deg. C. The -inches of water to open it. It is leak-tight at pressures Less superficially simple is the combination of the DAB 201-001 may be used with a maximum working as low as 1 lb./sq. in., while its normal working functions of each component. gas pressure of 6,250 lb./sq. in. at 90 deg. C. and will pressure is 110 lb./sq. in. As a unit, a Barrymount isolating machine mount burst at 8,000 lb./sq. in. at 20 deg. C. The disk itself is In the NAR 131 range, this valve is used on a cur­ functions in relation to the following factors: (i) the manufactured from 0·006 in. stainless steel and in the rent British military aircraft in a system controlling static load; (ii) the dynamic load or loadings; (iii) oper­ event of its bursting the exhaust air is deflected radi­ the engine bleed air. ating characteristics; (iv) the input of energy resulting ally to eliminate reaction forces, the vents being Although it can operate at high temperatures the from excitation and its subsequent release at a different covered by a simple rubber valve. valve has been developed to work down to a tem­ time cycle; (v) the necessary degree of machine Although primarily intended for gas storage ves­ stabilization. perature of minus 40 deg. C. At this lower tempera­ sels, the DAB 201-001 can also be used in high ture it is leak-tight at a pressure differential of as Summarizing the reasons for these mounts being pressure systems and over different pressure ranges low as 7½ lb./sq. in. To eliminate the danger of fitting used in the de Havilland Division of Hawker Siddeley with only slight modification. the non-return valve the wrong way round the NAR Aviation Ltd., Mr Durkin said that they were used: 131 is equipped with ⅜ in. B.S.P. inlet and ½ in. B.S.P. (a) To eliminate the need to use conventional methods NO SIGNIFICANT WEAR AFTER outlet connexions and the effective through bore is of locating and holding down machines; it is un­ 100,000 MILES of 5/16 in. diameter. necessary to drill holes in floors or to use holding The Hymatic NAR 131 non-return valve is con­ down bolts. Without showing any significant wear a Dowty structed of light alloy, its scaling element being a (b) To facilitate the re-arrangement of machines if undercarriage fitted to a Fokker Friendship airliner has withstood the impacts and stresses of more than diaphragm in flexible high temperature rubber. It and when the work being done on them makes this 20,000 take-offs and landings and being taxied over measures 2·5 in. long with a 1·25 diameter, and desirable—or single machines, equally, may have 100,000 miles. weighs only 0·2 lb. their positions adjusted. Aircraft Engineering http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Aircraft Engineering and Aerospace Technology Emerald Publishing

Auxiliary Equipment

Aircraft Engineering and Aerospace Technology , Volume 35 (11): 1 – Nov 1, 1963

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0002-2667
DOI
10.1108/eb033804
Publisher site
See Article on Publisher Site

Abstract

This record was established when West Coast Air­ lines of Seattle, U.S.A., stripped down a set of landing gear on one of their Friendship fleet. The aircraft was inspected for overhaul after completing 11,065 flying hours. Only minor details of the undercarriage assembly had to be replaced. Details of Some Components Used for Subsidiary In the light of this, it is interesting to note that 75 customers in 27 countries have ordered 242 Friend­ Services in Aircraft, Missiles and Space Vehicles ships and these aircraft are already being flown by 65 operators in 22 countries. The 218 Friendships so far delivered have logged approximately one million BARRYMOUNT SYSTEM OF MACHINE (c) To eliminate vibration and to isolate machines and flying hours. MOUNTING the floors upon which they stand from the excitatory Dowty designed and manufactured equipment on forces which have their origin in the operation of The Barrymount system of machine mounting is the Friendship, besides the main and nose under­ large numbers of machines of differing operating used extensively in the machine shops at the dc Havil- carriages, includes propellers and auxiliary gearboxes. characteristics mounted closely adjacent to each other. land Division works of Hawker Siddeley Aviation Ltd. (d) To eliminate structure-borne noise. at Portsmouth. AIRSCREW FANS Good management and good housekeeping go hand Barrymount isolating machine mounts arc manu­ in hand with efficiency in these machine shops. This factured in the U.K. by Cementation (Muffelite) Ltd., Four high-efficiency Airscrew fans arc being in­ is the immediate impression a visitor obtains and it is Hersham, Walton-on-Thames, Surrey, under licence stalled on each of the Hawker Siddeley 748 aircraft of confirmed by closer examination of the working from Barry Controls Division of the Barry Wright the Queen's Flight. arrangements. The lay-out of the machines is most Corporation. They comprise a 6 in. centrifugal forward curved carefully planned, and one of the reasons for using type unit situated under the cabin floor to the rear of this system of mounting machines is the case with MOBILE AIR COMPRESSOR the nose-wheel bay to supply conditioned air to the which whole sections of machines may be re-posi­ passenger cabin, and three 6·8 in. units, two of which An Air Partner, a mobile air compressor for start­ tioned, if and when machining operations make it for radio cooling, are located in the base of a radio ing jet engines, recently left London Airport for desirable. It is not unknown for a single machine to crate on the port side of the gangway at the entrance Fiumicino Airport, in Rome, for starting Boeing be re-positioned to suit work being done on it. to the crew compartment. Air is passed from this crate 707s and VC10s, of B.O.A.C. via an underfloor duct to a similar crate on the star­ This is easily and quickly accomplished when board side of the gangway. Barrymount isolating machine mounts are used. While a machine is absolutely stable and firmly The third unit is situated under the cabin floor near located, they arc, when these mounts arc used, virtu­ to the air conditioning fan and supplies additional air ally free-standing. The mounts rest on the floor and for radio cooling. All the fans operate at a low noise they have their own built-in levelling devices to level. facilitate re-setting up. It was this facility which led to the mounts first TROUBLE-FREE ICE PROTECTION SYSTEM being used about five years ago and since then more Over 150,000 flying hours, equivalent to 6,250 days, and more machines have been mounted on them as the of operation, have now been completed by the 67 opportunity has occurred. Subsequently, more Spraymat-applied propeller spinners fitted to the machines will be similarly mounted. The superinten­ Viscount fleets of B.E.A. and Lufthansa airlines. dent, machine shop, Mr R. Durkin, regards this Spraymat is the electrical ice protection system manu­ facility as a most important one, coupled as it is with factured by the Luton Division of D. Napier and Son the absence of any need to interfere with the floor Ltd., a member of the English Electric Group of surfaces. Companies. In addition, however, the designed function of the All the 67 spinners have attained a minimum of Barrymount system of machine mounting is to 2,000 flying hours each, while two of the 12 Spraymat 'actively' and 'passively' isolate machines from the spinners fitted to B.E.A. Viscounts for trial purposes area of the floor upon which they stand. That it so say, have exceeded 6,000 flying hours each. As the pro­ 'passive' in the sense that a machine which would be peller feathering control equipment is examined every affected adversely by external sources of vibration is The Air Partner, which can also be used for de- 100 hours as part of the routine maintenance cycle, insulated from them, and active in the sense that a icing in winter, is a safe and reliable source of power, this represents over 60 removal and refitting cycles of machine which is a source of vibration is isolated so giving a continuous flow of warm, oil-free air. It needs these particular spinners. This service record em­ that the incident of transmission to the floor upon only infrequent maintenance which can be carried out phasizes the point made by B.E.A. in their report on which it rests is reduced to a degree which renders it by airline engineers anywhere in the world. From the the trials that 'the spinners arc robust, and withstand insignificant. Air Partner the warm, compressed air passes through the normal maintenance and service handling without This can be demonstrated by a person placing his the small high-speed turbine starters geared to the any necessity for special instructions'. foot upon one of the mounts when the vibration aris­ jet or turboprop engine. The continuous air flow Lufthansa report that the Spraymat-applied spin­ ing from the operation of the machine can be felt, eliminates mis-starts. ners on their Viscounts have operated faultlessly, and but on the floor immediately alongside the machine Before being acquired by B.O.A.C. this particular they also comment on the effectiveness of Napier there is no evidence of vibration. Air Partner was used all over Great Britain and the Stoneguard, which protects the Spraymat installation The use of Barrymount isolating machine mounts Continent as a demonstration unit by Atlas Copco from stone and hail damage. The 55 Spraymat spin­ serves to interpose a barrier between a source of (Great Britain) Ltd., Maylands Avenue, Hemel ners fitted to Lufthansa's Viscount fleet were fabricated vibration, i.e. a machine, and any other mass with Hempstead, Herts, its manufacturers. by Westfalische Metall Industrie of Lippstadt, which it is in direct contact—in this context, the floor. Napier's Spraymat manufacturing licensee in Western The distinguishing feature of the design of the BURSTING DISK ASSEMBLY Germany, and they have now been in service for well Barrymount system of mounting machines is that it is over 100,000 hours. A bursting disk assembly for protecting high pres­ based on the principle of providing for a temporary Spraymat-applied spinners arc also in service in the sure gas storage vessels on aircraft from over-pressuri- storage of energy and its subsequent release, sub­ U.S.A., where they arc fitted to the Viscount aircraft zation has been developed by The Hymatic Engineering stantially in its entirety, at a time cycle which differs Co. Ltd., Redditeh, Worcs. Known as the DAB of United Airlines. from that at which the mount receives the input of 201-001, it is of particular use where systems have to energy, i.e. the frequency of excitation. be leak-tight over long periods, so overcoming the HIGH TEMPERATURE NON-RETURN VALVE Superficially, the design of a Barrymount isolating disadvantage of most relief valves when performing A non-return valve for use with gas at temperatures machine mount is a simple one. It is based on the use a similar function where a finite leakage exists. up to 250 deg. C. has been developed by The Hymatic of a moulded core of oil-resistant Neoprene which is The assembly is contained within a 1 in. B.S.P. plug Engineering Co. Ltd., Redditch, Worcs. Despite the bonded to a dished steel upper casing and a steel base and is designed to screw directly into the end of the high temperature, the valve is leak-tight in the reverse plate. The moulded form is contoured also to accom­ pressure vessel to be protected; it operates over a flow direction, requiring a pressure of only a few modate an integral steel levelling component. temperature range of minus 40 to plus 90 deg. C. The -inches of water to open it. It is leak-tight at pressures Less superficially simple is the combination of the DAB 201-001 may be used with a maximum working as low as 1 lb./sq. in., while its normal working functions of each component. gas pressure of 6,250 lb./sq. in. at 90 deg. C. and will pressure is 110 lb./sq. in. As a unit, a Barrymount isolating machine mount burst at 8,000 lb./sq. in. at 20 deg. C. The disk itself is In the NAR 131 range, this valve is used on a cur­ functions in relation to the following factors: (i) the manufactured from 0·006 in. stainless steel and in the rent British military aircraft in a system controlling static load; (ii) the dynamic load or loadings; (iii) oper­ event of its bursting the exhaust air is deflected radi­ the engine bleed air. ating characteristics; (iv) the input of energy resulting ally to eliminate reaction forces, the vents being Although it can operate at high temperatures the from excitation and its subsequent release at a different covered by a simple rubber valve. valve has been developed to work down to a tem­ time cycle; (v) the necessary degree of machine Although primarily intended for gas storage ves­ stabilization. perature of minus 40 deg. C. At this lower tempera­ sels, the DAB 201-001 can also be used in high ture it is leak-tight at a pressure differential of as Summarizing the reasons for these mounts being pressure systems and over different pressure ranges low as 7½ lb./sq. in. To eliminate the danger of fitting used in the de Havilland Division of Hawker Siddeley with only slight modification. the non-return valve the wrong way round the NAR Aviation Ltd., Mr Durkin said that they were used: 131 is equipped with ⅜ in. B.S.P. inlet and ½ in. B.S.P. (a) To eliminate the need to use conventional methods NO SIGNIFICANT WEAR AFTER outlet connexions and the effective through bore is of locating and holding down machines; it is un­ 100,000 MILES of 5/16 in. diameter. necessary to drill holes in floors or to use holding The Hymatic NAR 131 non-return valve is con­ down bolts. Without showing any significant wear a Dowty structed of light alloy, its scaling element being a (b) To facilitate the re-arrangement of machines if undercarriage fitted to a Fokker Friendship airliner has withstood the impacts and stresses of more than diaphragm in flexible high temperature rubber. It and when the work being done on them makes this 20,000 take-offs and landings and being taxied over measures 2·5 in. long with a 1·25 diameter, and desirable—or single machines, equally, may have 100,000 miles. weighs only 0·2 lb. their positions adjusted. Aircraft Engineering

Journal

Aircraft Engineering and Aerospace TechnologyEmerald Publishing

Published: Nov 1, 1963

There are no references for this article.