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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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Similarly, moisture may enter and condense within compartments and individual materiel during descent from altitude to ground level. You have no items in your shopping cart.

NATO-AECTP 230:2009

In the absence of specific information, test severities should be selected from those listed in Method b. The Drip test may be used to determine the effects of dripping water from overhead surfaces. Diurnal cycling about the freezing point may result in alternate freezing and thawing of accumulations possibly hidden pockets of moisture condensed out of the atmosphere inside the vehicle. The bigger the heat capacity of the materiel, the smaller the temperature gradient experienced within the materiel.

Compartments of vehicles may be pressurised. Immersion, precipitation and spray Externally fitted materiel shaded by the aircraft structure may still be subject to radiation reflected off the parking apron or landing pad. Consequently, dependent on the insulation of materials used in their construction and the presence or otherwise of heat-dissipating equipment, temperatures in the enclosed areas may be lower than the external ambient during the low temperature part of a diurnal cycle.

Thermal Shock During transportation, storage, or phases of service life, materiel may experience wide-ranging induced temperatures in excess of local ambient conditions. 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.

Some conditions may be localised to particular areas of a compartment. Concentration and distribution severities of particles are generally less in closed areas than those experienced in open sky situations. Reduced performance of batteries. ENTESC was able to design from scratch, develop, implement, test, qualify and deliver these items in less than 4 months of starting work.


The accumulation of moisture automatically leads to a higher dew-point temperature and, therefore, to a greater likelihood of saturation occurring during the lower temperature part of the cycle.

The relative humidity inside installed equipment with semi-sealed, unventilated enclosures will be reduced gradually by selfdissipated heat, although moisture content is unlikely to be reduced.

ProMIL NATO Stretcher Platform

Above deck on surface ships No measured data indicating severities of induced forms of wetting experienced by materiel installed or carried above deck are readily available.

Materiel stored on deck in 20 shelters or under temporary covers is likely to be subjected to high levels of induced humidity, especially when deployed in hot-wet tropic regions. Embrittlement and reduced elasticity of materials especially non metallicreducing resistance to mechanical shock.

JavaScript seems to be disabled in your browser. Induced environments included are: The armoured structure and temporary covers provided on military vehicles for protection against the weather and armed attack can aggravate the effects of the local meteorological conditions such as solar radiation and damp heat, especially where logistical and operational requirements preclude the provision of appropriate levels of ventilation.

Humidity in Fully Air-conditioned Compartments When simulating ground pressure testing for materiel installed in pressurised compartments, aectl severities for air pressures above standard ambient should be obtained from the airframe manufacturer or aircraft operator.

For each situation, the characteristics of relevant induced environments are described for each set of circumstances that may apply.

Pressure Levels of overpressure used to seal vehicle compartments are benign. In the case of externally mounted materiel, the situation will be aggravated by the indirect effects of solar heating. For deployment in low temperature regions, and 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 the ambient air: Some materiel may be subjected to fast transient temperatures or thermal shocks.

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.


If the aircraft remains idle and compartments remain closed, or if areas susceptible to ingress are protected by unventilated temporary covers, there is likely to be an accumulation of moisture. Icing may be counteracted by on-board de-icing systems during ground running. Petroleum and related technologies Also, advice is given on potential damaging effects and treatment options.

Air conditioned compartments The levels of precipitation associated with condensation on overhead surfaces and emergencies such as fractured and leaking joints in water pipes are unpredictable. Dust and Sand a. Expansion and contraction of structural components accompanied by reductions in mechanical strength and changes in ductility result in interference and separation between adjacent parts and impose unacceptable levels of stress and strain leading to deformation or mechanical failure.

Alternatively, temperatures should be assessed 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.

Temperatures in Fully Air-conditioned Compartments Spray and Splash a. Sea transportation Materiel on open decks is likely to be subjected to accumulations of ice formed from freezing spray. Warm air in the compartments and individual items of materiel mixes with lower temperature ambient air during the climb to altitude.

General Frosting or freezing of accumulations of moisture caused by induced variations of temperature and pressure may result in degraded performance or total failure of materiel in partial or no-conditioned areas. Reduced viscosity of lubricants and efficiency of lubrication systems. Dust and Sand Examples of effects and faults caused by dust and sand are: Thermal shock induces high rates of expansion and contraction, resulting in stress and fracture of materials, failure of bonded joints, and degraded performance of seals.

References are given in Annex B.