ICS, Doc ID, STANAG Ed 6. Title, CLIMATIC CONDITIONS – AECTP Edition 1. Original Title. Category, TS. Location. AECTP (Edition 1) Leaflet /2 World-wide Ambient Air Temperature and Humidity Conditions and Levels of Direct Solar Radiation Additional Climatic. NATO AECTP CLIMATIC CONDITIONS. Amendment by NATO Publication, 05/01/ This document is an amendment. View the base document.
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In cases of aextp carried stores, in which packing densities of heat dissipating systems and components are liable to be relatively high, final temperatures and rates of increase are likely to be in excess of those given above. Where it is required to test materiel to induced high temperatures when diurnal variations are so small as to have an insignificant effect on the materiel, or where it is considered that xectp response of the test specimen or its component parts are not related to temperature cycling, constant high temperature may be used.
High altitude aircraft and missiles High and low temperatures affect the physical and chemical characteristics of rocket fuels which may result in malfunction of motors of guided weapons. Creation of micro-climates in often hidden areas of entrapped moisture.
Internal temperatures of unventilated, partially sealed, heat dissipating equipment are liable to cause even greater pressure differentials. Preferably, test severities should be derived from specific measurements made on the intended transporting platform, on the intended flight platform, at eactp location in the compartment, or sectp area on deck during representative worst-case conditions expected in service. The platform may be in different configurations e.
Moisture is likely 23 be formed on external and internal surfaces of materiel during flight sorties as a result of the transfer between prevailing temperatures at ground level and flight altitude and vice-versa, especially wectp operating into aecctp out of airfields in sub-tropic or tropic regions. Temperatures in Fully Air-conditioned Compartments The amount of heat generated in the airframe is determined by the ‘recovery temperature’ and the heat transfer coefficient i.
To assist project engineers to prepare Environmental Design Specifications by providing improved environmental characteristics data that will help them to select more valid initial design values. Externally mounted equipment up to wheel height may be subjected to conditions simulating wind blown dust and sand thrown up by the wheels and tracks of the host or other vehicles operating in the area.
The trials programme should include flight sorties likely to produce worst-case conditions in service e. The operational pattern of the vehicle and the duty cycle of installed equipment may temper or further aggravate the effects. Icing Icing, frosting or freezing of trapped moisture may result in blockage or seizure of affected mechanical and electro-mechanical systems. Reduced efficiency of cooling systems, particularly those that depend on convection and radiation to the surrounding atmosphere, resulting in: Shipping Delivery Order tracking Aetcp.
Accelerated ageing and cracking, crazing or discoloration of protective finishes. During the hotter part of the diurnal cycle, especially when external surfaces, skins or compartment covers are subjected to solar radiation, equipment or components within may experience levels of damp heat in excess of the external ambient conditions.
Pressure tight components or pressure relief mechanisms may be of value to maintain materiel performance and reliability. Immersion, Precipitation and Spray Materiel subjected to immersion is 320 to ingress of water including contained contaminants causing seepage and swelling of materials and inducing faults and failures similar to those associated with condensation and high levels of humidity see Paragraph 3. Changes in the characteristics of shock and vibration isolation systems, reducing the life of materiel protected qectp mechanical environments.
GENERAL This leaflet addresses the climatic environments that may be experienced by 2230 when deployed or installed on fixed wing aircraft and on helicopters.
European Defence Agency – EDSTAR
Proximity to Refrigerated Units Certain types of materiel carried on materiel platforms may have built-in refrigeration systems that function during operations. External ambient air in cold regions may chill materiel in conditioned compartments at a higher rate than would be expected from the ambient air in temperate regions. ENTESC was able to design from scratch, develop, implement, test, qualify and deliver these items in less than 4 months of starting work.
Excessive friction and electrical losses in commutators and slip rings resulting in increased temperatures and brush wear. Reference should be made to Operational and Environmental Requirement documents 4. Components may deform, fail structurally, or interfere with internal parts, causing those parts or platform materiel to malfunction.
aectp climatic conditions
In the absence of a specified value, a level of 8 kPa 80 mbar over pressure should be assumed. Embrittlement and reduced elasticity of materials especially non metallicreducing resistance to mechanical shock. Reduced performance of batteries.
Dependent on the provision or otherwise of appropriate levels of aecgp or forced-air conditioning, materiel carried or installed within the protective structure or under temporary covers of trucks, trailers aecrp fighting vehicles is liable to be subjected to conditions in excess of the local ambient due to the response of the vehicle to the 23 ambient conditions, heat emissions from power sources and operating systems carried on the vehicle and their duty cycles.
AECTP series of leaflets are organised around classes of materiel items. Information on temperatures induced on surface ships inside sheltered areas or under temporary covers above deck is not readily available. It may be necessary for some items of materiel to remain installed during routine high pressure testing of 203 compartments. Temperature severities used in tests simulating high temperature conditions during air carriage should be derived using one or both of the following methods in descending order of preference: The magnitude of associated thermal shocks may be evaluated by calculating the difference of air temperature between the final location and the primary location.
Structural analysis of mechanical structures of steel in accordance with regulations antisismichemeccaniche steel in compliance with seismic rules; Drafting of thermal analysis, fluid flow, air flow distribution analysis for military shelters to military standards MIL-STD: Increased viscosity of lubricants reducing performance of mechanical systems.
aectp-230 climatic conditions
Log In Sign Up. Aircraft and space vehicle engineering Partial and Non-Conditioned Compartments These conditions occur inside enclosures from a combination of inadequate ventilation and forced breathing of moisture.
Severities for low air pressure tests may be determined from the Environmental Requirements documents and from the performance of the platform aircraft e. Induced damp heat conditions e. Characteristics of the climatic environments are presented, discussed, and supplemented by data sheets.
Advice is given on potentially damaging effects of induced climatic environments and, where relevant, the appropriate AECTP test methods and severities are recommended for simulation of the effects of those environments.
Where it is required to determine the effects on man mounted and portable materiel to exposure to dust and sand laden atmospheres, AECTP Method should be used. When operating in hot dry desert regions, or where the surface is liable to break up into small particulate, virtually any movement of the carrier or of the carried materiel is likely to result in contamination by dust and sand.
Indeed long-term ground running aaectp forced air cooling should be avoided in hot-dry regions to prevent permanent damage or degraded reliability. Careful consideration of the configuration of the test specimen, within its enclosure where applicable, is required when simulating the effects of solar heating.
A similar situation applies to materiel air dropped from conditioned cargo bays of fixed-wing transport aircraft or brought up from below decks on naval vessels, for example, when operating in low temperature regions. Materiel required to remain in-situ is liable to wetting when pressure-fed devices are used in cleaning and de-icing operations of the vehicle.
Confirmation of the aevtp efficiency of hatches and protective covers of externally fitted materiel may be satisfied by AECTP, MethodDriving Rain, conducted to determine the effects of exposure to natural forms of precipitation.