D.T.D.900AA Ministry of Defence Defence Procurement Agency, ADRP2 Abbey Wood Bristol BS34 8JH OBSOLESCENCE NOTICE All DTD specifications were declared obsolescent from 1 st April 1999. All DTD 900 series approvals also lapsed at that time. The standards will no longer be updated but will be retained as obsolescent documents to provide for the servicing of existing equipment. Further Guidance The aim in declaring the specifications obsolescent is to recognise that the documents are not being updated and thus should be used with care by both purchaser and supplier. For example, a specification could contain valid technical information but may also contain type approval clauses that contradict procurement policy and/or use materials that do not comply with environmental legislation. The obsolescent specification can still be used as a basis for a purchase provided that the supplier and purchaser agree suitable changes to the specification within the purchase order/contract. For the DTD 900 system, each specification has provided an MoD approved material and process. For these items, the declaration of obsolescence will constitute the termination of both the extant MoD approval and the continuing MoD assessment that had underpinned those approvals. Again, the technical content of the document remains valid and can be used by both purchaser and supplier as a basis for a contract but an acceptable (to the parties) approval/assessment procedure would be required.
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D.T.D.900AAMinistry of DefenceDefence Procurement Agency, ADRP2Abbey WoodBristolBS34 8JH
OBSOLESCENCE NOTICE
All DTD specifications were declared obsolescent from 1st April 1999. All DTD 900series approvals also lapsed at that time. The standards will no longer be updated butwill be retained as obsolescent documents to provide for the servicing of existingequipment.
Further Guidance
The aim in declaring the specifications obsolescent is to recognise that thedocuments are not being updated and thus should be used with care by bothpurchaser and supplier. For example, a specification could contain valid technicalinformation but may also contain type approval clauses that contradict procurementpolicy and/or use materials that do not comply with environmental legislation. Theobsolescent specification can still be used as a basis for a purchase provided that thesupplier and purchaser agree suitable changes to the specification within thepurchase order/contract.For the DTD 900 system, each specification has provided an MoD approvedmaterial and process. For these items, the declaration of obsolescence will constitutethe termination of both the extant MoD approval and the continuing MoD assessmentthat had underpinned those approvals. Again, the technical content of the documentremains valid and can be used by both purchaser and supplier as a basis for acontract but an acceptable (to the parties) approval/assessment procedure would berequired.
PROCUREMENT EXECUTIVE, MINISTRY OF DEFENCE DTD 900AA(Superseding DTD 900Z)
SEPTEMBER 1988
Aerospace Materials SpecificationAPPROVAL PROCEDURE FOR PROPRIETARY MATERIALS
AND PROCESSES
1. ScopeThis specification describes the procedure governing the approval of proprietary materials and processes. It also
includes Appendices listing all materials and processes approved under its terms together with the name and address ofthe manufacturer or proprietor, the trade name of the material or process, if any, and the approval serial number.
The terms “proprietary material’’ and “proprietary process” for the purpose of this specification are applicable tomaterials or processes not covered by a BS aerospace, DTD or other specification approved by the procurementExecutive, Ministry of Defence.
As approval under this specification covers proprietary materials and processes, details of which may be divulged inconfidence to the Design Authority and/or Procurement Executive, Ministry of Defence, no specifications for theindividual items are available and enquiries should be addressed to the manufacturer or proprietor concerned.
2. Procedure to be followed in seeking approval(i) Action to be taken by the Design Authority
In order to obtain approval of a proprietary material or proprietary process for use in the construction, operation orrepair of aerospace equipment, the Design Authority shall, with the agreement of the manufacturer or proprietor, applyto the Head of Materials and Structures Department, Royal Aerospace Establishment (RAE), Farnborough, Hants, GU146TD giving the following information:
(a) The name of the material or process;(b) Evidence of the need of the material in Grade A or other critical parts;(c) Evidence for the need for the use of the process, with details of any effects which cannot be readily assessed
by inspection either after processing or after delivery (eg effects on fatigue life);(d) Details of tests that demonstrate the properties and utility of the material or process.
(ii) Action to be taken by the manufacturer or proprietorIf an Agreed Firm’s Schedule (AFS) for the material or process is being prepared or already exists, Head of Materials
and Structures Department, RAE shall be informed. Otherwise full details of a scheme for the routine inspectional controlof the material or process shall be submitted to the Head of Materials and Structures Department, RAE. These shallinclude (i) formulation and tests necessary to ensure that subsequent supplies or results will be of the same standard ofquality as that for which approval is sought and (ii) a recommended system of control to be operated by an approvedinspection organisation. Information regarding formulation and processing will be treated as confidential.
3. Approval(i) Approval is contingent upon:
(a) Satisfactory results having been obtained by the Design Authority (see Clause 2.(i) (d));(b) The acceptance by Head of Materials and Structures, RAE, Farnborough, of the proposed schedule for routine
inspectional control (see Clause 2.(ii));(c) The approval of an appropriate inspection organisation of the quality assurance system of the manufacturer of
the proprietary material or process.(d) The restriction or use of the material or process to those applications defined under ‘Extent of Approval’ in
Appendices I, II or III of this specification.It should also be noted that an Agreed Firms Schedule (AFS) alone is not a substitute for DTD 900 approval Materials
and processes covered only by an AFS must not be used for Grade A parts, nor in circumstances where prior approvalis required by the provisions of Defence Standard 00-970 or other Design Document.
(ii) The letter of approval will specify:(a) The extent of the approval;(b) An approval serial number, eg DTD 900/1234. This approval serial number must be quoted on all relevant
drawings, contracts, release notes, instructions for use and other documents wherein the material or processis specified;
(c) The number of the relevant AFS.(iii) Formal approval will be followed by the inclusion of the relevant details in Appendices I, II or III of this
specification.(iv) Initial approval will be valid for five years and will be renewed subject to the design Authority supplying proof
of a continued requirement three months prior to the end of the approval period.(v) The prior agreement of the Head of Materials and Structures, RAE, Farnborough must be obtained before an
approval may be transferred to another firm.
4. Inspection(i) Each cast, batch or lot as defined in the Test Schedule of a Material for use in a Grade A or other critical part
is to be inspected to the requirements of the Test Schedule.(ii) All materials and parts treated by a process approved under this specification shall be inspected to the
requirements of the appropriate Test Schedule.(iii) Each batch or lot as defined in the Test Schedule of material for use in the make-up of a processing medium is
to be subject to inspection to the Test Schedule.(iv) The Director of Aeronautical Quality Assurance Directorate may at any time call for check tests on samples
representing supplies delivered under the requirements of Clauses 4(i), 4(ii) or 4(iii).
5. Changes in terms of approval No change in formulation or in the inspection schedule shall be made without prior agreement of the Head of Materials
and Structures, RAE, Farnborough, who will decide whether the significance of the change warrants the addition of asuffix to the approval number or the allocation of a new number.
Approved for Issue,
Dr. G. PocockHead of Materials and StructuresRAE, Farnborough
APPENDICESAppendices I, II and III include all proprietary items approved for use in the manufacture, operation or repair of
aerospace equipment, and are grouped in the following manner:
APPENDIX I Metallic Materials
Brazing Metals and SoldersBearing MaterialsNon-ferrous MaterialsFerrous MaterialsHeat and Wear Resisting Materials
APPENDIX II Non-Metallic MaterialsAdhesives and CementsSelf Adhesive FilmsCleaning MaterialsCorrosion PreventativesDamping FluidsDe-icing and De-frosting FluidsFilling MaterialsGlass and Glazing Materials Honeycomb Core MaterialsHydraulic FluidsInsulating MaterialsJointing MaterialsLubricantsMetal PolishesPaints and VarnishesPlastics MaterialsRubbers and Synthetic RubbersSealing MaterialsThread CompoundsMiscellaneous
APPENDIX IIIProcesses Applied to Metals
Processes
Etching and Filming TreatmentsProcesses Applied to Non-Metallic Materials
Page33455
789999
1010101010111213131415161717
191919
APPENDIX IV is a numerical list and index of all current approvals, including cross-references to Appendices I, IIor III.
2
APPENDIX I
D.T.D. 900 AA
ApprovalNumber
Material Extent of Approval Manufacturer
4018A Silver Brazing Alloy Grade MX-18
4535A Savbit No 1, Soft Solder
4578
BRAZING METALSAND SOLDERS
LM10A Silver-Tin Solder
For silver soldering
For soldering of electrical, radio,etc connections, in lieu of solder toBS 219.
The Sheffield Smelting Co Ltd, PO Box 28,Windsor Street, Sheffield S4 7WD
Johnson Matthey Metals Ltd, 81 Hatton GardenLondon EC1.
4603 Silver Brazing Alloy MN2
For use (1) where a high temperature offunctional use is involved, ie higherthan that advisable for tin/lead solderand (2) where a higher resistance tocorrosion than that provided by leadcontaining solder is required.
For use on steel, including high alloytypes and nickel alloys eg for elevatedtemperature service.
ditto
4769A
4770A
4771A
For silver solderingSilver Brazing Alloy Grade LX13
Silver-bearing, soft solder Grade For soft silver solderingST400
Silver Brazing Alloy Grade MX-18 For silver solderingI
dittoplus (Melt-Esi Plus)
The Sheffield Smelting Co Ltd, PO Box 28,Windsor Street, Sheffield S4 7WD.
Silver-bearing, soft solder GradeSLT 200 For soft silver soldering
BEARING MATERIALS
Glacier Standard Wrapped Bushes
Ferobestos LA37
Hidurax Special
Deva Metal Sintered BearingMaterial Ref HCuSn 86.13/6-1T1 (BH l/6)
Deva Metal Sintered BearingMaterial Ref HCuSn 86.13/8-1T1 (BH 1/8)
Deva Metal Sintered BearingMaterial Ref HCuSn 86.13/10-1T1 (BH 1/10)
Deva Metal Sintered BearingMaterial Ref HCuSn Pb 83.
13/8-1 (BL 1/8)Deva Metal Sintered Bearing
Material Ref BL HCuSn Pb 83.13/10-1 (BL 1/10)
For use as wrapped bushes
For use in bearings in under-carriageassemblies
For sintered bearings.
dittoditto
Phosphor bronze castings including solidand cored sticks for bearings and otheraerospace applications.
For filter elements in aerospaceequipment.
For application where an oil-freelubrication is specified.
For use in engine bearing applicationsFor applications where components
cannot conveniently be formed orpressed from conventional bearingmaterials and where it is undesirable toemploy conventional lubricants orwhere reduced boundary friction isrequired.
For use in bushes and other suitableaerospace applications
For use in aerospace applicationsoperating at elevated temperatures
ditto
ditto
Glacier Metal Co Ltd, Kirkstyle, Kilmarnock,Ayrshire.
Tenmat Ltd, Materials, Engineering Division,PO Box 22, Trafford Park, Manchester M171RU.
For use in aerospace applications Glacier Metal Co Ltd, Argyle House, Joel Street,operating at elevated temperatures. Northwood Hills, Middx HA6 1LN
For use where resistance to heat,abrasion and corrosion is required.
For use in aerospace bearingapplications.
Deloro Stellite Ltd, Stratton St Margaret, SwindonWilts.
Glacier Metal Co Ltd, Argyle House, Joel Street,Northwood Hills, Middx HA6 1LN
ditto
ditto ditto
Bonded PTFE/glass fibre laminate, self-lubricating bearing material, plain andflanged bushes, thrust pads and rings,flat bearings and rollers for use inspecified aircraft applications. TheBonding Process is limited to bondingthe laminate to specified metals.
dittoditto
For use in aerospace bearing
Bonded PTFE/glass fibre laminate, self-lubricating bearing material, plain andflanged bushes, thrust pads and rings,flat bearings and rollers for use inspecified aircraft applications. TheBonding Process is limited to bondingthe laminate to specified metals.
Bonded PTFE/nylon laminate, self-lubricating bearing material for use inaerospace applications.
Bonded PTFE/glass fibre laminate, self-lubricating bearing material, plain andflanged bushes, thrust pads and rings,flat bearings and rollers for use inspecified aircraft applications. TheBonding Process is limited to bondingthe laminate to specified metals.
dittoBonded asbestos cloth/phenolic resin
used as bearings and wearing strips;heat insulation strips, maximumtemperature 175°C.
For electrical contacts particularly forbrushes in contact with slip rings andsimilar applications.
For use as electrical contact material inaerospace equipment.
ditto.ditto.ditto.
For use as wire, strip or pressed parts forcontacts brushes and similar applica-tions in the aerospace industry.
Chromium steel wire for use in buildingup of worn, over-machined orcorroded components and therestoration of press fits by sprayapplication from pistol or gun.
For hard facing ferrous parts forresistance to abrasion, corrosion andhigh temperatures.
For hard facing steel partsWear resistant material for use in
aerospace equipment.Rods for hard facing steel parts.
Castings for resistance to wear andheat
ditto
Rods for hard-facing steel parts.Castings for resistance to wear andheat.
For resistance to wearFor hard facing ferrous partsFor hard facing ferrous partsFor resistance to wear and heatFor hard facing ferrous parts
ditto.For building up worn components by
spraying.For hard facing by sprayingFor hard facing ferrous parts where
resistance to abrasion, corrosion andhigh temperature required.
ditto.ditto.
For forming nickel aluminide coatingson metal for bonding, protection atelevated temperatures and for mixingwith other materials.
For application to surfaces subjected towear and heat.
For use where a resistance to heat andcorrosion are required.
ditto. ditto.
For applications to surfaces where aresistance to wear, heat and corrosionare required.
Johnson Matthey Metals Ltd, 81 Hatton Garden,London EC1.
General purpose adhesives for bondingmetals, ceramics, glass, rubber andplastics.
A strippable light duty system forbonding polyolefins to aircraft acryliccanopies.
For interbonding of phenolic asbestosand aluminium alloy in phenolicasbestos drop tanks.
For use as a laminating resin in thefabrication of the fins for drop tanks‘Jaguar’ aircraft and for ‘Tornado’radomes.
For bonding aluminium alloy fittings tocarbon fibre reinforced composites.
For use in bonding polymethylmethacry-late parts which fit accurately within0.12 mm.
Materials suitable for locking threads,retaining and sealing close fittingmetallic and non-metallic joints with apredetermined locking torque.
For locking threads, sealing andretaining metallic and non-metallicjoints with a predetermined lockingtorque.
For use as a curing agent for coldsetting epoxy systems used as aflexible gap sealant.
Two part, cold setting epoxide resin forbonding metals, ceramics and wood tothemselves and each other.
Two part, rapid setting multi-purposeadhesive, suitable for bonding metals,ceramics, glass, rubbers, rigidplastics.
Two part, low viscosity hot or coldcuring multi-purpose system suitablefor bonding large areas.
Two part hot or cold curingmulti-purpose system suitable forbonding metals, ceramics, rubber,plastics to themselves and each other,produces bonds that are semi rigid withretention of strength up to 120°C.
Two part hot or cold curing multi-purpose system suitable for bondingmetals, ceramics, glass, rubber, rigidand glass reinforced plastics; givingbonds with high shear and high peelstrengths.
Imperial Chemical Industries Ltd,(Plastics Division), Bessemer Road, WelwynGarden City, Herts.
(Plastics Division), Bessemer Road, WelwynGarden City, Herts.
ditto.
ditto.
7
D.T.D. 900 AA
APPENDIX II-continued
ApprovalNumber
6046
6060A Loctite 648 and Loctite TCA
6074 E32 Structural Epoxy Adhesives(2 part)
6082 E11 Epoxy Adhesive
6088 E04 Toughened Epoxy Adhesive(2 part)
ditto.
6093
6095
6097
ditto.
6098 Raychem Adhesive S1125
6102A Flexon Acrylic Adhesive F241with Initiator No 1
4663A
4961
4969
6072
Material Extent of Approval
ADHESIVES AND CEMENTS-continued
Araldite 2007 Adhesive system One part hot curing multipurposeadhesive suitable for bonding metals,ceramics, fibre reinforced plastics,glass and some other heat resistantmaterials. Some resistance to water.Retains some strength up to 130°C.
A thread locking sealant given a pre-determined locking torque on threadedmetal fasteners and close fittingmetallic and non-metallic joints, can bcused with or without activator.
ESP 110 Single Part EpoxyAdhesive
Chemlok 236A Bonding Agentand Chemlok 205 Primer
Activators N and TCA
SELF ADHESIVE FILMS
Scotchcal brand Fluorescent 3484Series and 3960 Scotchcal EdgeSealer
Self Adhesive Emblems andMarkings, Scotchcal Film No4690 with Edge Sealer.
Self Adhesive Emblems andMarkings, Scotchcal Film No3650 with Edge Sealer.
For use as a room temperature curingadhesive system which gives goodcohesive impact and vibration resistantbonds.
For a two part, room temperature curingepoxy adhesive which. exhibits goodimpact and vibration resistantproperties.
For use as a toughened adhesive, curingat room temperature where goodimpact and vibration properties arerequired. It also has good gap fillingproperties and is thixotropic.
For use as a high temperature adhesivefor structural bonding metal-to-metalcomponents with good gap fillingproperties.
For bonding metal retaining plates intoan EPDM rubber container, and forlaminating plies of EPDM rubber.
For use as adhesive activators tofacilitate complete curing of Loctiteanaerobic adhesives and thread lockingcompounds on both active and inertsurfaces.
For a two part epoxy adhesive forbonding Raychem heat-shrinkableplastic and elastomeric tubing andmoulded components.
For the bonding of metal subframes toneoprene rubber seals and neoprenerubber seals to UNSTRESSED acrylictransparent canopy material in HarrierGR3, T4 and Mk8; Sea Harrier FRS 1and 2 and Hunter MkV aircraft.(Note: Unstressed during fabrication.)
For improving conspicuity of aircraftin poor daylight.
Emblems, letters and numbers on air-
Emblems, letters and numbers on air-craft (restricted to 400 knots).
Relates to the use of pressure-sensitiveadhesive transparent tapes as aprotective surface for areas in forwardfacing radomes and on helicopter rotorblades to minimise sand and rainerosion.
For a self-adhesive polyurethane filmfor the protection of irregular jointsand leading edges of helicopter bladesaerofoil sections and other surfacessubject to erosion by high speedparticles and rain.
For use where increased conspicuity isdemanded, for aircraft, ground supportequipment, safety markings and signs.For adverse environments, aircraftexceeding 400 kts, a proprietary edgesealer, compatible with PVC and theaircraft paint finish shall be used.
For the marking of military aircraft,aeronatical equipment, militaryvehicles signs and markings.For advance environments, aircraftexceeding 400 kts, a proprietary edgesealer compatible with PVC and theaircraft paint finish shall be employed.
For cleaning carbonised deposits fromjet engines in situ.
For hot stripping metal enginecomponents of carbon deposits andpaint residues.
Designed for use at elevated temper-atures. If used outside strictly definedoperating conditions severe corrosionmay result. Before use a suitableprocess specification must besubmitted and approved. Not to beused on steel parts of UTS greater than1400 n/mm2, if stressed.
Removal of paint from hydrauliccomponents.
Heavy duty paint strippers for useon aircraft epoxy and polyurethanepaint systems.
For use in blade root bearings forRotol propellers.
For use in filling Dowty liquid springs.
DE-ICING AND DE-FROSTINGFLUIDS
Kilfrost ABC De-icing Compound Anti-icing protection for parked aircraft,and for the de-frosting of turn-round
Kilfrost WWF/MOD2
aircraft. Not considered suitable foruse in aircraft de-icing systems.
Windscreen washing fluid for use incertain aircraft.
operations.For filling voids in pressure cabins and
preventing chafing of bag tanks.
compound.
Filling and coating resin for porousphenolic resin impregnated asbestosmouldings.
For filling pop rivets and minordepressions-two part cold curingstopper.
APPENDIX II-continued
For glazing windows in non-pressuredaircraft.
Non-shrinking glazing compound andintegral tank sealant. Sealant for cablelooms in Plessey end fittings.
For aerospace glazing
As a facing glass for aerospace glazing.For the toughening of structural glass for
aerospace glazing.The extent of this approval relates to a
colourless transparent, biaxiallyorientated, unplasticised cross-linkedpolymer of methylmethacrylate sheet;having specific light transmission andcraze resistance characteristics,intended for use as an aircraft glazingmaterial.
Core material for aerospace sandwich Ciba-Geigy (UK) Ltd, (Bonded Structuresstructures Division), Duxford, Cambridge CB2 4QD.
For use in the main undercarriage
Hydraulic Fluid for VC10 aircraft
shock absorbers in Comet and Nimrodaircraft.
Fibrous thermal insulating material foruse at temperatures up to 1100°C.
For use in the manufacture of thermalinsulating blankets resistant totemperatures up to 1000°C.
The approval relates to sintered aluminafor use in special application ceramics,engine ignition systems electricalinsulation, metal-ceramic assembliesand sealed terminals. Suitable for usewhere high temperatures and chemicaland mechanical erosion are required.
Sealing compound resistant to petrol,mineral oil and ester lubricant.
A pigmented varnish jointing compoundwhere resistance to kerosine or esterlubricants is required.
For prevention of leaks of gases at hightemperatures on Rolls Royce turbineengines.
Non-hardening liquid engine jointingcompound resistant to mineral oils,ester lubricants, avaition fuels andwater.
For use in the construction of hollowsteel propeller blades.
Jointing compound, used as substitutefor DTD 369B where resistance toester lubricants is required.
High temperature jointing material
Jointing compound, used as a substitutefor DTD 369B where resistance toester lubricants, kerosine and heat arerequired.
As a bonding, surfacing or gap-fillingmedium.
For use as a sealant between metal facesin engines
Anti-fretting compound resistant to esterlubricant (anti-fretting approvalsubject to type test in specific joint).
Anti-corrosion jointing compound fornon-rotating axle assemblies requiredto be broken down and adjusted.
Jointing material essentially for gasketapplications.As above, but where heavy loads are
involved.High temperature (to 130°C) resistant
non-drying jointing compound for anti-corrosive purposes.
Fuel tank gasketsThe approval is for use as a jointing
compound for metal-to-metal faceswhere a tolerance to vibrationdistortion or thermal expansion isnecessary. Can be used in contact withmineral oil and gasoline up to 200°C.
For protection of Perspex panels andshaping from damage in handling andstorage.
For use on exhaust rings, manifolds,stubs and tail-pipes.
External protection of coils impregnatedas for DEF31-A.
For internal protection of aircraftengines.
Externally in conjunction with glassfibre as fireproof tank covering.
Externally in conjunction with glassfabric as fireproof tank covering.
For use on mild steel exhaust parts ofaero-engine.
Anti-tracking finish for electricalequipment.
Primer for use on external surfaces ofradomes as specified in DTD 926B.
Corrosion preventing lining forrefuellers and bulk fuel tanks.An impregnating varnish for electrical
coils, where resistence to temperaturesup to 200°C is required.
For cockpit interiors or equipmentinstalled therein.Protection of rubber from ozone
cracking.Electrical impregnating varnish for
continuous operation at 200°C.Stoving enamel resistant to castor oil
based hydraulic fluid, stoveable at180°C alone or at 150°C when curedwith an accelerator.
A waterproof etching primer withantifret properties (antifrettingapproval subject to type test in specificjoint).
Scuff resistant finish with fire resistantand anti-abrasion properties forcockpit floors.
Internal scheme for radomes anddielectric windows.
Bonding glass-cloth to wooden heli-copter rotor blades.
Protection of engines and enginecomponents made of aluminium,magnesium or their alloys.
Chemically resistant walkway coating tobe applied over the full finishingscheme, for access areas on uppersurfaces where there is a slippinghazard and no safety tapes can beapplied.
Epoxy primer suitable for entry intofilling factories but not for direct andcontinuous contact with explosives.
For the protection of magnesium andmagnesium alloys as part of theprocess conforming with DTD 911C.
Protection of aircraft engine components PPG Ind (UK) Ltd, Rotton Park Street,up to 550°C. Birmingham, West Midlands B16 0AD.
Surface protection of fabric reinforcedrubber and/or plastic proofed sheeting.
Protection of GRP and metallic surfacesagainst rain erosion.
FPT Industries Ltd, The Airport, PortsmouthPO3 5PE
Imperial Chemical Industries Ltd,(Paints Division), Wexham Road, Slough, Berks.SL2 5DS.
Stoving enamel for aircraft enginecomponents. Maximum temperaturefor use 250°C.
For addition surface protectionand/or colour finish of rubber and/orplastic components.
Cold curing paint scheme. Good extensi-bility weathering performance.
The approval relates to a coating systemhaving a good flexibility and strengthto restrain the movement of looserivets in aircraft engine intakes. Alsosuitable for application to the leadingedges of aircraft wings to protect thesesurfaces against the effects of erosion.
The approval relates to a 2-pack elasto-meric glossy polyurethane system forapplication to radomes and leadingedges of aircraft wings to protect thesurface.
The approval is for a cold curingfinishing scheme for use on extensionsurfaces of aircraft subject to erosion.
The approval relates to a 2-pack poly-urethane finishing paint suitable forapplication to polypropylene oxidepolymer coated aluminium. The painthas specific infra-red reflectingproperties.
Encapsulation of electrical components.
Plastic Armour
Laminating Resin for the fabrication offins for drop tanks for Jaguar aircraft.
As a light weight armour in aircraft
For the reinforcement of the alloy skinson the removable fin for the JaguarDrop tank.
PVC film for facing glass fibre mat, usedfor insulation in aircraft where themaximum temperature does not exceed80°C.
For aerospace structural parts
As a low pressure laminating resin forradomes.
For the manufacture of switch blockson ‘G’ switches.
Rigid Polyester/urethane foam charact-erised by its fine cell structure, withcontrolled mechanical and electricalproperties; for use up to a maximum200°C, used as an interlaminar foamin the construction radomes and otherstructural applications.
PPG Ind (UK) Ltd, Rotton Park Street,Birmingham, West Midlands B16 7JA.
FPT Industries Ltd, The Airport, PortsmouthPO3 5PE
PPG Ind (UK) Ltd, Rotton Park Street,Birmingham, West Midlands B16 7JA.
Imperial Chemical Industries Ltd.(Paints Division), Wexham Road, Slough, Berks.
The approval relates to the use of a coldsetting epoxy laminating resin, for theproduction of high performancecomposite materials in aerospaceapplications where the operatingtemperature does not exceed 100°C.
The approval relates to the use as alaminating resin with a suitablehardener for the fabrication ofaerospace structural componentsfabricated by a wet lay-up technique.
The approval relates to the use of aglasscloth reinforced polymethylmeth-crylate resin laminate intended forlocal edge reinforcement of aircrafttransparencies where the formingtemperature of the acrylic shape doesnot exceed 160°C.
The approval relates to the use of apolyethylene terephthalate (Terylene)fabric reinforced poly-methyl metha-crylate resin laminate intended forlocal edge reinforcement of aircrafttransparencies, where the formingtemperature does not exceed 160°C.
For f lexible fuel tanks
ditto.
As buffer pads, sealing strips on aircraftwhere resistance to oil, or hightemperature is not required (Not to beused in thicknesses less than 1.2 mm.)
For fittings on flexible fuel tanks.
For rotating shaft seals in contact withfluids (not above 100°C except formineral oil).
For special valve assemblies in fuelsystems.
For use with castor oil based hydraulicfluids.
Synthetic rubber material for rotary shaftseals for use in contact with mineraloils and greases, and ethylene glycolbetween -40° and +100°C.
Manufacture of accumulator bladders.
Manufacture of seals for use in mineralbased hydraulic fluid systems between-30°C and +80°C.
Manufacture of rotary garter seals foruse in contact with aircraft fuels.
Moulding of parts to operate between-30°C and +120°C and to beresistant to hydrocarbon fuels(gasoline and kerosine).
Moulding of parts to operate between-30°C and +100°C, to be abrasionresistant to exhibit resistance tomineral based oils.
Moulding of parts to operate between-50°C and + 130°C, to be resistant tosilicate ester based fluids.
Moulding of parts to operate between-50°C and +80°C and to exhibitresistance to mineral based hydraulicfluids.
George Angus & Co Ltd, Fluid Seals Division,Coast Road, Wallsend, Northumberland.
Dowty Seals Ltd, Ashchurch, Nr Tewkesbury,Glos. GLO20 8JS.
ditto.
ditto.
ditto.
15
APPENDIX II-continued
D.T.D. 900 AA
ApprovalNumber Manufacturer
4999
6006A Rubber Compound 2412
6018 Rubber Compound AM88
6019
6022
Rubber Compound AM78
Silicone Rubber Angus GradeSIS 75
6026 Rubber Compound AO109
6034 Rubber Compound 640
6035 Rubber compound 1109 ditto
6077
4058
4451A
4452
4493
4502A
4506
4523 Access Door Sealant PR1301
4582C Polycast Type 2
4590
Material Extent of Approval
RUBBERS AND ELASTOMERS-continued
Rubber Compound AM 0967 Moulding of parts, having good metalbonding characteristics, required tooperate between - 10°C and +200°Cand exhibit resistance to mineral basedhydraulic fluids, oils and fuels.
For moulding of parts operating between-50°C and + 190°C and to exhibitresistance to phosphate ester hydraulicfluids.
For seals operating between -40°C and+80°C and having a resistance tocastor oil based hydraulic fluids.
For seals operating between -50°C and+80°C and resistant to mineral basedoils.
For fabrication of rotary seals used incontact with heavy mineral and diesterbased oils. Not suitable for use withpetroleum based fuels, light mineral oilor grease derived from them.
Moulding of parts used in air and relatedsystems; and isopropyl nitrate systemsbetween -40°C and +100°C.
Moulding of parts required to operatebetween -40°C and +80°C and toexhibit resistance to mineral basedhydraulic fluids and lubricating oils.
Moulding of parts required to operatebetween -60°C and +120°C and toexhibit resistance to mineral oils andcertain silicone based ester fluids.
The approval relates to the use of amagnetically loaded rubber sheet thatcan be used as a surface waveabsorber, and as a broad band absorberover a limited range.
For pressure sealing of cabins, cockpitsand integral tanks.
Pressure cabin sealing 750C for pressuregun or trowel application; 802 forbrushing.
Barrier coat over sealants on interior ofintegral fuel tanks.
Barrier coats over polysulphide sealing PRC (UK) Ltd, Portland Road, Newcastle-upon-compounds on integral fuel tanks. Tyne NE2 1BL.
Dual purpose sealants for (1) Integralfuel tanks when used in conjunctionwith sealant top coat. (2) Pressurecabin sealing (3) Sealing the edges ofpolyvinyl butyral interlayered safetyglass.
Dual purpose sealant of brushing con-sistency for (1) Pressure cabins and (2)Integral fuel tanks when used with anapproved top sealing coat.
Sealing access doors in integral tanksand other places where sealants may bebroken.
Two part cold setting sealing andcaulking compound for fillet sealingalong overlapped external butt skinjoints and other crevices.
Brushing-type polysulphide sealant forintegral tanks and pressure cabins foruse at temperatures up to 145°C;sealing of root end covers of Scout andWasp wooden tail-rotor blades.
16
ditto.
Dowty Seals Ltd, Ashchurch, Nr. Tewkesbury,Glos. GLO20 8JS.
ditto.
ditto.
George Angus Co Ltd, Fluid Seals Division,Coast Road, Wallsend, Northumberland.
Dowty Seals Ltd, Ashchurch, Nr Tewkesbury,Glos. GLO20 8JS.
Potting and encapsulation of electricaland electronic equipment. Caulkingand sealing of aircraft. Fabrication ofsilicone parts where DTD 818 was notapplicable.
ditto.ditto.
Quick repair sealant for integral fueltanks, fuel cell cavities, and pressurecabins.
Thixotropic compound for sealingvertical faying surfaces of integral fueltanks pressure cabins and for use asgeneral assembly jointing compound.
Integral fuel tanks and pressure cabinsealant.
Primer system used with two-part coldcuring sealants for use in fuel tanks andpressure cabins.For sealing aircraft windows, pressur-
ised cabins and integral fuel tanks.The approval relates to the use as asealant for integral fuel tanks or firewalls.The approval relates to the use as a firewall sealant within the temperaturesrange -60°C to +200°C.
ditto.For a two-part sealant curing by
addition of an acceleration, notdependent on solvent evaporation,cured sealant has good resistance topetroleum based oils and fuels. Can beused between -53°C and 182°C.
For thread lubrication on low-pressure Acheson Colloids Co, PO Box 12, Prince Rock,aircraft oxygen systems. Plymouth, Devon PL4 0SP.
Completely sealed self-luminous sourcederived from a phosphor activated byTritium gas for emergency signs inaircraft.
Coolant for AWG11/12, Coolingsystems of UK versions of McDonnellDouglas Phantom II
Coolant liquid in TransmitterARI 23165.
Dielectric coolant in the high powertravelling wave tube of Radar AR15980.
For use as a backing board in conjunc-tion with flexible self-sealing fuelcells.
The approval relates to the use as aprotective fire sleeving on a varied rangeof flexible hose assemblies; suitable foruse in designated fire zones with atemperature range -55°C to +260°C.
Alloy and pure metal powdersapplied by detonation gun L W- 1,LW-18, LW-5, LW-15, LC-1-15,LC-1-25, LC-1-H, LDT-400 andWDT-800Alloy and pure metal powders
applied by Plasma Process,LCW-1, LCW-2, LC-4 andLW-11B
ETCHING AND FILMINGTREATMENTS
Almeco No 100
PROCESS APPLIED TO NON-METALLIC MATERIALS
Garan Finish for Glass FibreTapes and Webbings
Extent of Approval
For bonding aluminium and aluminiumalloys to metallic materials forapplication involving heat dissipation,heat exchangers, protection againsthigh temperature oxidation, and wherejoining by aluminium bonding isappropriate.
For the treatment of piston engineexhaust systems of military aircraft.
For preparation of clad aluminium alloyprior to the application of the ICIalocrom process.
Process for parts which run in amaintained environment of oil orgrease. The process shall not howeverbe applied to steels of a minimumtensile strength of 90 tons/force/sq in(1400 x 10 N/m2). Bearing steels toSpec EN/31/SI35/SI36 are excludedfrom this restriction.
Low temperature (570-580°C) salt bathnitriding process.
The approval relates to the preparationof corrosion/erosion resistant coatingsfor use on engine components
exceeding 650°C.operating at temperatures not
The approval relates to the preparationof Low-friction surfaces on metalsubstates.
The extent of the approval is for thesepowders, applied either by detonationgun (6086A) or a plasma process(6087A), for use where resistance toheat, wear and corrosion are required.
ditto.
An etchant for treatment prior to spotwelding and subsequent painting ofsheet aluminium, aluminium coatedalloys and aluminium-manganesealloys.
A filming treatment for aluminiumand/or aluminium alloys; prior topainting or varnishing.
A filming treatment for aluminium andaluminium clad aluminium alloy sheetprior to painting (approved for Navalaircraft).An etchant for treatment of aluminium
and aluminium clad alloys prior topainting.
An etchant for treatment of aluminiumand aluminium clad alloys prior topainting.
The approval relates to an etchantsolution for the removal of heavycorrosion products from an aluminiumor aluminium alloy surface prior to theuse of a conversion coating.
For chemical treatment of woven glassfibre tapes and webbings used as rein-forcement with polyester resins.
Manufacturer
Wellworthy Ltd, Lymington, Hants SO4 9YE.
Ferro (GB) Ltd, Ounsdale Road, Wombourne,Wolverhampton, West Midlands WV5 8DA.
Imperial Chemical Industries. Ltd,(Paints Division), Wexham Road, Slough, BerksSL2 5DS.
Brent Chemicals, Ridgeway, Iver, Bucks SLO 9JJ.
Keighley Laboratories, Croft House, South Street,Keighley, West Yorks.
Sermetech (UK) Ltd, High Holborn Road, Codnor,Ripley, Derbyshire DE5 3NW.
6086A Alloy and Pure Metal Powders, applied by De&a- tion Gun LW-1, LW-lB, LW-5. LW-15, LC-I-llm K;-$ LC-l-25, LC-1-H. LDT-400 and
6087A Alloy ,,kd Pure Metal Powders, applied’ by Plasma
6088 Pmce&LCN-1, LCN-2, LN-2: LtX and LW-11B
EO 4 Toughened Epoxide Adhestve (two-part) . 6092A Polysulphide Sealant PR 1750 Classes A, B and C : 6093 ESP 110, Epoxy Adhesive, Single Part . 6095 Chemlok 236A Bonding Agent and Chemlok 205