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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Long-term ground running without forced-air cooling should be avoided in hot, dry regions, otherwise permanent damage or degraded reliability may occur. Road and rail transportation For materiel carried in covered and in enclosed vehicles, icing of materiel during transportation normally arises entirely from the prevailing meteorological conditions.

aectp-230 climatic conditions

AECTP does not address all environments arising from accident, hostile conditions or nuclear effects. Lowering of viscosity and reduced efficiency of lubricants. 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.

For externally carried stores in which packing densities of heat dissipating equipment are likely to be greater than that in aircraft compartments, final temperatures and rates of increase are likely to be in excess of those given above.

Latest News of the Blog. Mechanical systems and components for general use Examples include materiel located in compartments of military vehicles, trailers and temporary covers used as command posts or for conducting covert surveillance. This ingress affects materials and operational performance of materiel in the same manner as accumulations of moisture through breathing in of high humidity atmospheres. Rubber and plastic industries Materiel carried in covered vehicles Operation and movement of common carriers are likely to generate clouds of dust and sand that intrude into the interior vehicles because they are not dust-proof.

Determination of the performance of materiel when subjected to spray and splashing may be satisfied by testing for the effects of natural precipitation, for example, driving rain or dripproofness AECTP Method Immersion, precipitation and spray See paragraph 2. If materiel is mounted at low positions on the aircraft e. While on the surface, submarine manoeuvres in the prevailing sea conditions or washing and hosing down operations can result in levels of exposure ranging from mild spray or splashing to green seas.

AECTP – What does AECTP stand for? The Free Dictionary

Humidity Storage and handling problems occur in enclosures experiencing high humidity. In addition to the indirect effects of solar heating, the effect may be aggravated by the heat given off by installed equipment.

Temperature levels 1 Materiel installed inside aircraft compartments may be subjected to high ambient temperatures due to heat given off by engines and auxiliary power units, engine exhaust systems, avionics and electrical equipment or due to being located in a stagnant area such as an equipment rack or behind an instrument panel.

In the absence of measured data, severities may be derived from knowledge of maximum rates of climb and descent for the host aircraft. Although heat dissipated by equipment while operating will help to reduce the relative humidity, heating and cooling associated with its duty cycle may also aggravate the situation.

When power is switched off and the materiel cools, the differential air pressure on either side of the walls of an enclosure may cause the enclosure to breathe in external air and increase the level of retained moisture. Tailored test severities 4.


Increased viscosity of lubricants reducing performance of mechanical systems. Recommended fall-back severities should be used. Induced levels of climatic elements, either singly or in combination, such as temperature, humidity, air pressure etc.

AECTP series of leaflets are organised around classes of materiel items. Temperatures in Fully Air-conditioned Compartments Aircraft parked Dependent on its location on the flight platform, levels of humidity experienced by materiel may exceed those of local meteorological conditions. Also when cold surfaces meet relatively warmer air during descent and landing, moisture condenses out as the air temperatures are reduced below their respective dew points. 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.

Protective covers of large items that withstand normal variations of standard atmospheric pressure may be of particular concern. Materiel carried in un-pressurised areas will be subject to the prevailing ambient pressure at the flight altitude. Dependent on the provision or otherwise of appropriate levels of ventilation or forced-air conditioning, materiel carried or installed within the protective structure or under temporary covers of trucks, trailers and fighting vehicles is liable to be subjected to conditions in excess of the local ambient due to the response of the vehicle to the external ambient conditions, heat emissions from power sources and operating systems carried on the vehicle and their duty cycles.

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. Test procedures that apply steady state conditions are likely to be relevant to materiel required to spend periods of time in areas where temperature and levels of humidity are determined by dissipated heat from power supplies and operational equipment.

Wind Blown Sand and Dust Although materiel may be fitted with pressure equalisation devices, rates of change of pressure during flight sorties may exceed design values. Proximity to Refrigerated Units Certain types of materiel carried on materiel platforms may have built-in refrigeration systems that function during operations. Indeed, long-term ground running without forced-air cooling should be avoided in hot, dry regions, otherwise permanent damage or degraded reliability is likely to occur.

Ambient temperatures surrounding individual materiel will also depend on the location inside the vehicle, i. Excessive friction and electrical losses in commutators and slip rings resulting in increased temperatures and brush wear. Changes to characteristics of shock and vibration isolation systems. The Blowing Dust method should be used for materiel installed in partially sealed compartments or those which are likely to be opened for routine inspection and maintenance.