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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Air pressure within the hull may rise above standard ambient while submerged, especially when firing a salvo of weapons. Worst cases occur where the diurnal cycle is characterised by high temperatures during the day and low temperatures at night, producing corresponding variations of pressure in the covered areas, causing them to breathe in moisture, some of which is retained when the external ambient temperature rises again.

Changes in characteristics of materials used in manufacture of electronic components causing: Materiel deployed or installed on aircraft operating in hot, dry regions of the world, may experience extremely low levels of humidity when subjected to the indirect effects of solar heating or when located close to sources of dissipated heat during ground running. Confirmation of the sealing 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.

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Such data are used primarily to formulate test levels for qualification trials. Flight sorties Moisture may 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 when flying into and out arctp airfields in tropic regions.

Frosting and icing of sensors and optical devices can reduce the performance of surveillance and navigation systems. During long term ground running in hot regions, the combined aecfp of heat radiated from adjacent structures and operational equipment aectl tend to counteract the effects of the conditioned air. AECTP complements, amplifies, and extends information previously contained in STANAG by identifying potential damaging effects that natural and induced environmental conditions have on materiel, and by providing guidance on the selection of suitable test methods.

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The aect descriptions and severities relate to the totally exposed or containerised materiel as appropriate. The two units are controlled by the remote control panel RCCP.

In the absence of measured data, severities may asctp derived from knowledge of maximum rates of climb and descent for the host aircraft.

Materiel deployed externally on the aircraft may be subject to pressurised spray when the aircraft is hosed down during cleaning or de-icing operations in preparation for flight. Heavy closed cover e. Long-term ground running without forced-air cooling should be avoided in hot, dry regions, otherwise permanent damage or degraded reliability may occur.

Packaging and distribution of goods Preferably, test severities should be derived from specific measurements made at the location representative of the aetcp conditions expected in service. Icing Icing, frosting or freezing of trapped moisture may result in blockage or seizure of affected mechanical and electro-mechanical systems. Rates of change experienced by carried materiel depend on aircraft performance, the flight or mission profile and whether the materiel is carried in a pressurised or non-pressurised area.

AECTP does not address all environments arising from accident, hostile conditions or nuclear effects.

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In addition to the indirect effects of solar heating, the effect may be aggravated by the heat given off by installed equipment. Materiel carried in covered vehicles Operation and movement of common carriers are likely to generate clouds of sectp and sand that intrude into the interior vehicles because they are not dust-proof. 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.

For the purpose of this document, induced climatic conditions are the ambient environmental conditions resulting from the modification of the natural climatic conditions due to the structure in which, or on which, the materiel is utilised. Sand and dust a. Acceleration of chemical and biological attack. The operation of linkages, release mechanisms and actuation systems becomes impaired or completely blocked due to interference caused by the build-up asctp ice.

The platform environment for materiel carried in covered vehicles is characterised primarily by ambient air temperature within the enclosed area, influenced by solar radiation falling directly on the covering surface.

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Icing may be counteracted by on-board de-icing systems during ground running. Conversely, such protective structures and temporary covers are also liable to be better radiators to the night skies than the ambient air, such that temperatures in enclosed compartments may be lower than the external ambient.

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For the purpose of this sub-section, materiel exposed in storage or handling aecto may be unprotected or within some form of protection package or container. Temperature and humidity AECTP test procedures give values of temperature and humidity for external ambient meteorological conditions and for conditions induced by storage. High temperature Examples of the effects of high temperature are: Above deck on surface ships acetp.

Aerodynamic heating 1 Materiel located in forward compartments and close to leading edges of high performance aircraft and similar areas of externally carried stores, can be subjected to high temperatures caused by aerodynamic heating during air-carriage at supersonic speeds.

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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. Surfaces of externally deployed materiel are may be sprayed with other types of wetting agents such as de-icing fluids. Reference should be made to Operational and Environmental Requirement documents 4. In the latter case, conditioning is aggravated by the change in air pressure forcing in warm, damp air.

Humidity in Partially and Non-conditioned Compartments 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.

In the absence of specific information regarding the size of compartments, a maximum duration of one minute should be assumed for the pressure to fall to its minimum value.

In the absence of a specified value, a level of 8 kPa 80 mbar over pressure should be assumed. Unintentional functioning of thermally activated devices.