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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The level of ventilation is likely to be such that any moisture in the incoming air is liable to be retained during the heating phase of the next diurnal cycle, raising the relative humidity and dewpoint temperature inside the enclosure. Frosting and icing of sensors and optical devices can reduce the performance of surveillance and navigation systems. In the absence of specific information, test severities should be selected from those listed in Method b.

Pressure Pressure sensitive devices designed to detect and respond to small changes in pressure may incur permanent damage during air carriage in cargo bays of transport aircraft.

If materiel is mounted at low positions on the aircraft e. However, pressuresensitive materiel designed to respond to small changes in pressure, and walls of partially sealed containers with leakage rates lower than induced rates of change of pressure, may suffer temporary or permanent damage or distortion. 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.

Compartments of vehicles may be pressurised. In the absence of measured data, test severities should be based on information given in Operational and Environmental Requirements documents such as the intended geographical areas of deployment, the type of vehicle, and the location on the vehicle. Unventilated compartments of flight platforms deployed in wet tropical regions may breathe in moisture as a result of pressure changes induced by the diurnal temperature cycle.

AECTP – What does AECTP stand for? The Free Dictionary

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. Expected induced levels should be determined from specific measurements for particular applications. The minimum temperature experienced during storage may be warmer than the meteorological minimum.


The effects include, but are not necessarily limited to, impaired performance of optical systems due to accumulations of particulate matter, corrosion of exposed underlying materials, blockage of apertures, and reduced efficiency of cooling and ventilation systems.

The movement of military vehicles in desert areas is liable to result in dust and sand-laden atmospheres in which localised concentrations may approach those of naturally produced dust and sand storms.

Increased viscosity of lubricants reducing performance of mechanical systems. Log In Sign Up. Some materiel may be subjected to fast transient temperatures or thermal shocks. Materiel and components contained in carried stores will be affected similarly.

ProMIL 150 NATO Stretcher Platform

Altitude above Sea Level a. Tactical requirements may include carrying and handling materiel over various types of terrain, negotiating obstacles, immersion in various depths of water, and exposure to dust and sand 203 atmospheres, which are likely to result in contamination and ingress of foreign substances including non-pure water.

Expansion and contraction of structural components, accompanied by reductions in mechanical strength and changes in ductility, result in interference and separation between adjacent parts.

Textile and leather technology Internal high temperatures of individual materiel will depend on similar factors to those discussed above.

The frequency and durations of exposure in these conditions will be determined by the operational requirements. 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. The Drip test may be used to determine the effects of dripping water from overhead surfaces.

As ground running continues, the environmental control system becomes more effective. Dust deposits inside materiel may cause short-circuiting of insulators, tracking and build-up of static electricity, interference between moving parts, and contamination of lubrication systems. Preferably, test severities should be derived from data obtained on the intended flight platform while located in the expected geographical area of deployment.

To a lesser extent, the wheels and tracks of land-based vehicles also generate clouds of dust and sand. Representative simulation of blast pressure waves from explosions, gunfire and weapon launch is best achieved by subjecting materiel to the real life environment. When power is applied either directly from the engine or from external supplies, on-board environmental control systems will distribute conditioned air to some compartments of the aircraft or to aircraft carried stores to alleviate the effects of induced conditions.


Protective covers of large items that withstand normal variations of standard atmospheric pressure may be of particular concern. When ground running or hovering at low level over desert areas or areas covered in other types of small particlesrotary winged aircraft are noted for self inducing dust and sand environments. 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.

Dimensional changes and differential thermal expansion of structural and mechanical components causing: Normal Operational Transient Changes The operation of linkages, release mechanisms and actuation systems becomes impaired or completely blocked due to interference caused by the build-up of ice. Immersion, Precipitation and Spray 3.

Test severities should be matched to the particular application. Warm air in the compartments and 20 items of materiel mixes with lower temperature ambient air during the climb to altitude.

The relative angle of elevation between the source and exposed surface, the prevailing 2230 cover, the heat capacity of the exposed structure, its colour and surface finish, and the duration of exposure will contribute to the amount of heat absorbed sectp the induced temperature of enclosed areas.

Discoloration and crazing of protective finishes. Recommended fall-back severities should be used. Air Pressure Altitude, compartment differential pressure, blast, and rapid decompression are factors contributing to induced levels of air pressure.

Conditions may be aggravated by heat dissipated by vehicle power units, installed operational equipment and personnel carried on board. High temperatures inside unventilated compartments are likely to exceed local ambient temperatures due to the indirect effects of solar radiation on the aircraft skin and through transparent panels.

Rapid change of temperature