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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Internal high temperatures of individual materiel will depend on similar factors to those discussed above. Indeed, long-term ground running without forced-air cooling should be avoided in hot, dry regions, afctp permanent damage or degraded reliability is likely to occur.
Normal Operational Transient Changes a. Once temperature-stabilised, moisture penetration will be more by absorption than induced pressure differentials and by natural or forced-air circulation.
Rapid expansion and contraction of materials resulting in deformation and failure of structural components. Exceptions could include periods of tactical transportation in enclosed areas of military vehicles such as trucks, personnel carriers, fixed wing and rotary wing aircraft or in temporary buildings. Materiel carried in a covered platform Absolute humidity experienced by materiel during transportation is quite the same as external ambient or meteorological humidity.
Humidity in Partially and Non-conditioned Compartments The ambient conditions in partially and non-conditioned compartments can range from a dry heat to a damp heat environment. Aircraft parked High temperatures inside unventilated compartments may exceed local ambient temperatures due to the indirect effects of solar radiation. Pressure differentials are likely to occur across the walls of partially sealed cases and protective covers of individual materiels, causing moisture to be breathed in and retained.
This leaflet addresses the climatic environments that may be experienced by materiel during road, rail, air or sea transportation among manufacturing sites, storage bases, forward areas, and in tactical situations. This leaflet addresses the induced climatic environmental conditions likely to be encountered by materiel deployed on, or installed in, land-based vehicles.
Road vehicles engineering The absolute pressure experienced by materiel contained within the compartment should be assumed to be the maximum value of ambient pressure likely to occur at sea, in the order of mbarplus some specified level of overpressure determined to be appropriate.
Severities of concentration and distribution of particulates above ground level depend on the same parameters as for naturally occurring dust and sand clouds. Alternatively, temperatures should be aectl taking into account indirect effects of external ambient conditions, the form and level of ventilation, and heat dissipated by vehicle systems such as engine compartments, power generators and installed equipment.
The purpose of the AECTP series of leaflets is to present characteristics and data samples of natural and induced aect conditions that influence the design of materiel. To determine the highest temperatures that carried stores may be expected aecpt withstand, data should be obtained at specific locations within platforms where stores are to be carried. Increased burning rates of explosives and propellants.
It is possible for extreme values of ambient air temperature and solar radiation to occur on the same day, but experience shows the probability of this happening is aextp.
To permit customers or potential customers to ask intelligent questions to confirm that key environmental characteristics and issues have been, or will be addressed by suppliers or potential suppliers. Partial and non-conditioned compartments Reference should be made to Operational and Environmental Requirement documents 4.
This leaflet addresses climatic environments that may be experienced by materiel during storage and handling. This aspect is covered extensively in these leaflets.
aectp climatic conditions
Values of overpressure for particular applications should be determined by reference to Operational and Environmental Requirements documents or the vehicle manufacturer.
Air pressure See paragraph 2. Servicing procedures will, from time to time, require that panels be removed for access to plug-in points on aircraft and air carried stores. Aerodynamic heating and thermal shock Dust and Sand a. The mechanical structure of the air conditioning was then verified by analysis in accordance with the requirements of mechanical vibration described in MIL-STD E Procedures – The Method In the absence of specifically measured data, values for the latter should be assumed to represent worst-case induced conditions experienced by materiel during storage.
Pressure variations induce the breathing-in of moisture, some of which is retained when the high temperature is restored. Moisture is likely to be formed on external and internal surfaces of materiel during flight sorties as a 320 of the transfer between prevailing temperatures at ground level awctp flight altitude and vice-versa, especially when operating into and out of airfields in sub-tropic or tropic regions.
Partial And Non-Conditioned Compartments Emergency flight conditions caused by failure of the pressurisation system or failure of the aircraft structure induce rapid or explosive decompression during which deployed materiel may be required to remain safe, survive or continue operating.
Decreased burn-rate of explosives and propellants.
ProMIL NATO Stretcher Platform
The relative angle of elevation between the sun and the exposed surface, the prevailing cloud cover, the surface finish, the colour and heat capacity of the radiated surface, and the duration of exposure will determine the amount of heat absorbed. As ground running continues, the environmental control system becomes more effective.
Any attempt to tailor test severities to specifically measured data for the Dust and Sand test is unlikely to be cost effective. Temperature and humidity a. Sea transportation Materiel subjected to immersion, precipitation and spray is likely to suffer ingress of water through apertures, seals, joints and seepage.
In those cases where low temperature cycling is considered more appropriate, a low temperature diurnal cycle test should be used. Materiel not intended for operation mainly on the ground e. Sea transportation Air pressure above standard ambient may cause problems. Advice is given on potentially damaging effects of induced climatic, chemical and biological environments and, where relevant, the appropriate AECTP test methods and severities are recommended for simulation of the effects of those environments.
To a lesser extent, the wheels and tracks of land-based vehicles also generate clouds of dust and sand. For deployment in low temperature regions, in the absence of measured data, the following severities may be assumed to represent worst case conditions at switch-on for materiel in enclosed compartments of which the skin surfaces are better radiators of heat to the night sky than is the ambient air: