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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Also, during take-off and landing or as a result of flight manoeuvres, rates of change of pressure far in excess of those arising from meteorological conditions may occur 3.
Test procedures that apply steady state conditions are likely to be relevant to materiel required to spend periods in areas where temperature and levels of humidity are determined by dissipated heat from power supplies and operational equipment. The potential damaging effects of those environments are described, and advice is given on the selection of asctp methods and severities.
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The relative angle of elevation between the eactp and the aedtp surfaces of the vehicle, the prevailing cloud cover, the heat capacity of the exposed structure or cover, its colour and aecfp finish and the duration of exposure will all contribute to the amount of heat absorbed within the enclosed area and the induced temperatures. Subjective observations indicate that materiel can be subjected to short periods of precipitation equivalent to heavy rain and accumulations of water up to mm deep.
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. Materiel carried in unpressurised regions will be subject to prevailing ambient pressures at flight altitudes. When cold surfaces meet warmer damp air, condensation forms on colder surfaces and drips or runs onto crevices where it may accumulate and cause other problems such as corrosion aecfp electrical short circuits in the materiel itself or in other materiel or stores.
Such breathing accelerates the degradation of materials and causes a higher frequency of malfunction of materiel than would exposure to the local meteorological conditions alone.
Textile and leather technology Materiel may experience thermal shock. To assist test engineers in preparing test specifications by indicating which test methods are aectpp when considering how to test for specific climatic environmental effects. In the absence of measured data, severities may be derived from knowledge of maximum rates of climb and descent for the host aircraft.
Dust and sand a. Partial and non-conditioned compartments a. This aspect is covered extensively in aecgp leaflets. The circumstances in which man mounted and portable materiel are likely to be deployed world-wide are infinitely variable. Rates of change should be determined from data measured during representative flight trials. Preferably, test severities should be derived from specifically measured data including the influence of any form of conditioned or non-conditioned enclosure such as a military vehicle or temporary shelter.
Handling Induced transient temperatures experienced by materiel when handled may generate unacceptable levels of stress due to differential thermal expansion or contraction between materials. Preferably, test severities should be derived from data obtained on the intended flight platform while located in the expected geographical area of deployment. Accelerated ageing and cracking, crazing or discoloration of protective finishes.
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The trials programme should include flight sorties likely to produce worst-case conditions in service e. Temperatures in Fully Air-conditioned Compartments Ground running When the host aircraft is ground running on airfields in hot-dry adctp regions or on temporary landing strips, the backwash from propellers or the efflux from jet engines can produce considerable concentrations of air-borne dust and wectp and other types of small particulates.
Cracking of grains and pellets of explosives and propellants 3. This fron panel is realized so that the air contitioner can be easily installed and dismounted externally from the shelter by means of fork lift. Light closed cover Light closed cover for this chapter encompasses buildings of light construction, containers and other light temporary structures.
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Even materiel located in partially sealed enclosures are vulnerable. Materiel deployed or stored on aircraft required to operate from airfields or landing areas in dry desert regions may be exposed to dust and sand-laden atmospheres caused by aircraft operations and movement of land-based vehicles.
Test conditions, therefore, should be determined from specific measurements for the particular application. Solar radiation has a direct temperature elevating effect on outer surfaces of materiel. The induced temperatures are liable to impose thermal stresses more severe than those caused by naturally occurring meteorological conditions. It is preferred that test severities should be derived from specifically measured data including the influence of any form of conditioned or non-conditioned enclosure such as a temporary shelter.
Some of the moisture is liable to be retained if the enclosure is not sufficiently ventilated when the temperature rises and airflow is reversed. In some cases the heat and moisture dissipated by operational machinery will be the dominant factor such that when the vessel is operational, constant ambient conditions ranging from dry to damp heat can occur.
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Low temperature Examples of the effects of low temperature are: These effects may be of particular concern where man mounted materiel such as communications equipment relies on the convection and radiation to the surrounding atmosphere to maintain an acceptable operating temperature.
This icing will be similar to that due to natural conditions. For ships manoeuvres in prevailing sea conditions, containers or stores placed above deck, and movement of vehicles or other types of service platforms that use the ship as an operational base, can result in levels of wetting ranging from mild spray or splashing to rough seas.
Increased viscosity of lubricants reducing performance of mechanical systems. When simulating ground pressure testing for materiel installed in pressurised compartments, test severities for air pressures above standard ambient should be obtained from the aecrp manufacturer or aircraft operator. Hydrostatic Pressure During sea transportation, materiel carried on board for subsequent immersion in the sea, will be subjected to hydrostatic pressure dependent on the depth of immersion defined in the design requirement for the individual materiel.
Man mounted and portable materiel may be subjected to rapid change of temperature during transfer from air conditioned buildings to external ambient conditions when deployed in geographical regions noted for wectp extremes of temperature both high-tolow and low-to-high temperatures. Immersion, Precipitation and Spray Materiel subjected to immersion is liable 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.
Condensation and Drip a. Variations within those limits will depend on external ambient conditions and the amount of heat given off by operational materiel and personnel occupying the compartment, but may be considered aechp once established aect; the climatic area of operation.
Flight sorties Freezing of induced moisture depends on the provision or otherwise of localised drainage, accumulations of water are likely to be frozen by low temperatures at flight altitude. Aerodynamic heating and thermal shock Failure of bonded joints. Alert me in case of modifications on this product contact us. Accumulated Moisture Materiel installed in compartments of the aircraft or air-carried stores that are susceptible to breathing and retaining moisture, may experience frosting and icing due either to sub zero temperatures at flight altitude or when cold surfaces meet warmer damp air during descent to ground level.
Worst-case operational conditions in wet tropical regions are likely to be at switch-on, especially if that occurs during the low temperature phase of the diurnal cycle. Also when cold surfaces meet relatively warmer air during descent and landing, moisture condenses out as the air temperatures are reduced below their acetp dew points. The combined effects of induced high temperatures and dissipated heat may result in very low levels of relative humidity occurring inside confined spaces of materiel deployed in hot dry regions of the world.
As aecfp the case of naturally created conditions, the finer dust particles are likely to be found in suspension especially where turbulent airflows exist. Warm air in the compartments and individual items of equipment mixes with lower temperature ambient air during the aectl to altitude.