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, condensation and ingress of moisture occur inside compartments and individual materiel during descent from altitude to ground level.
Embrittlement and reduced elasticity of materials especially non-metallicreducing resistance to mechanical shock. Materiel required to remain in-situ is liable to wetting when pressure-fed devices are used in cleaning and de-icing operations of the vehicle. Materiel on ships deployed above deck or in magazine areas may be required to survive, remain safe or continue to operate when subjected to blast from gunfire and motors of ship-launched weapons.
Normal Operational Transient Changes a. Under certain conditions of temperature and humidity, hygroscopic materials in an enclosure may release moisture to the air and this moisture can subsequently condense on the internal surface of the enclosure causing accumulation of water. Dimensional changes and permanent sets in gaskets and seals reducing sealing efficiency.
These factors could impose unacceptable levels of stress and strain leading to aetp or mechanical failure. Some level of immersion may be experienced by internally fitted materiel dependent on the efficiency of sealing of doors and hatches. Ground running When the host aircraft is ground running on airfields in hot-dry desert regions or on temporary landing strips, the backwash from propellers or the asctp from jet engines can produce considerable concentrations of air-borne dust and sand and other types of small particulates.
It may be assumed that when engines are running or aircraft systems are operating from external power supplies, canopies and hatches will be open and air conditioning systems will be operating, providing ventilation and a reduction in the level of moisture of the atmosphere in the previously closed compartments.
Erosion by impact See paragraph 2. Changes in characteristics of aeftp used in manufacture of electronic components causing: Sea transportation Generally, test methods using diurnal cycles will be applicable to materiel in enclosed areas on or above deck.
Low humidity Very low levels of relative humidity can result in a build up of static electricity causing flashover and failure of low voltage electronic 2230. For each situation, the characteristics of relevant induced environments are described for each set of circumstances that may apply. This is particularly applicable at airfields in hot, wet tropic regions, where the diurnal cycle characterised by actp temperatures during the day and low temperatures at night produces variations of pressure in partially sealed, unventilated compartments.
Expected induced levels should be determined from specific measurements for particular applications. 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. Immersion, Precipitation and Spray 2. Wectp of apertures – reduced efficiency of ventilation and cooling systems.
The relative humidity inside installed materiel within semi-sealed, unventilated, enclosures will be aecyp gradually by self-dissipated heat, although moisture content is unlikely to be reduced.
Any attempt to tailor test severities to specifically measured data for the Dust and Sand test is unlikely to be cost effective. Temperature and humidity AECTP test procedures give values of temperature and humidity for external ambient meteorological conditions and for conditions induced by storage.
Therefore equivalent or lower levels of RH may be assumed to occur inside nominally dry aircraft compartments or similar areas of individual materiel subjected to induced high temperatures. Tracking and reduced insulation especially when combined with dust deposits. Helicopters can be enveloped in dense clouds of dust or sand. The minimum temperature experienced during storage may be warmer than the meteorological minimum.
Aetp drying out, resulting in reduced performance of some materials.
AECTP – What does AECTP stand for? The Free Dictionary
Increased burning rates of explosives and propellants. Energy and heat transfer engineering For an individual materiel, location on the vehicle should also be taken into account, i. Erosion by Impact Leading edges and forward facing surfaces of externally carried materiel may be susceptible to erosion by impact with rain, hail, dust and sand or other forms of particulate, especially during flight.
As systems warm up, conditions will tend to sectp and levels of RH will probably decrease with heat dissipated by operational equipment. Icing The potential damaging effects of icing qectp materiel are the stresses imposed at joints and interfaces of adjacent parts; damage incurred as a result of the methods used to remove the ice; and the subsequent accumulation of moisture after melting of the ice.
Where internal ambient temperatures or those of individual components are of concern, they should be estimated using thermal analysis programs incorporating the severities given above and supported by specific measurements made in representative conditions.
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. Severities of concentration and distribution of particulates are generally less than those experienced in open sky situations. Materiel carried in an enclosed platform Normally during flight, materiel installed in pressurised compartments will experience air pressures ranging between local ground ambient and some lower value equivalent to that at a predetermined altitude for example m.