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AECTP-230
Defence design authorities and test engineers who write the climatic clauses of an Environmental Requirements Document
AECTP-230 is NATO's catalogue of natural and induced climatic conditions and data, used to set the climatic design and test criteria for defence materiel.
AECTP-230, Climatic Conditions, is a NATO Allied Environmental Conditions and Test Publication. It is a catalogue of data, not a set of requirements in its own right: it describes the natural (meteorological) climatic conditions found worldwide and the induced conditions that transport, storage and a host platform add on top, identifies the damage each can cause, and gives advice on choosing a test method. A project uses it to write the climatic clauses of its own Environmental Requirements Document or Life Cycle Environmental Profile, and to pick test severities from its companion publication, AECTP-300. The current edition is Edition B, Version 1 (June 2025). It carries no technical change from the previous edition: the record of significant changes states that "no technical content within the AECTP-230 leaflets of Edition B Version 1 has been modified or changed," the changes being an updated introduction, a corrected table value, and refreshed climatic-category maps.
AECTP-230 is one of two documents carried by STANAG 4866, which is what gives it force among nations that ratify it: "the agreement of nations to use this publication is recorded in STANAG 4866." Its companion under that same STANAG is AECTP-300, which holds the test methods AECTP-230's data feeds. The wider AECTP family covers other environments the same way in pairs of a conditions document and a test document: mechanical conditions under STANAG 4867 (AECTP-240 and AECTP-400), and electrical and electromagnetic conditions under STANAG 4868 (AECTP-250 and AECTP-500). AECTP-230 and AECTP-300 were both previously carried by STANAG 4370, and AECTP-230 still says it "should be used in conjunction with STANAG 4370," which now carries the general environmental guidelines document AECTP-100.
Most of AECTP-230 is organised around where materiel physically sits, because that changes which climatic conditions actually reach it. After a general section on the mechanisms involved (temperature, humidity, air pressure, hydrostatic pressure, icing, dust and sand, wetting, and erosion by impact), separate leaflets work through transportation by road, rail, air and sea; handling and storage; man-mounted and portable equipment carried by troops; installation on land vehicles; deployment on aircraft, including the aerodynamic heating a supersonic weapon or high-speed aircraft skin experiences; deployment on ships and submarines; and air and surface weapons, from launch through free flight to target-activated systems such as mines. Each leaflet follows the same shape: what induced conditions occur there, what damage they cause, and which AECTP-300 test method and severity to select. The numbers are concrete and specific to context, for example a temperature of -21 °C to -57 °C assumed for parked materiel across the cold climatic categories, or 90 to 95 percent relative humidity assumed inside a conditioned aircraft compartment during descent into a tropical airfield.
A separate part of the document (Section 2311, in three leaflets) defines fourteen climatic categories used throughout: three hot-dry land categories, three hot-humid land categories, five cold land categories, and three marine categories. For each one it gives a diurnal cycle of temperature, humidity and solar radiation recommended as a design criterion. For a hot category the design value is the temperature "attained or exceeded at the hotter locations in the category, on average, for a total time of approximately 7.4 hours (i.e., 1 percent of one month) during the hottest period of the year"; the cold categories use the mirror image of that same 1-percent-of-a-month definition. Each category also carries the highest or lowest value ever reliably recorded. A companion leaflet covers other factors that do not fit neatly into temperature and humidity: atmospheric pressure at altitude, ozone concentration, wind and gust speed, precipitation intensity, hail, ice accretion, snow load, and blowing sand and dust concentration.
Rather than only offering fixed fallback numbers, AECTP-230 also sets out a method (Section 2310) for an asset manager to turn their own field measurements into a defensible design or test value, using a statistical method based on recorded daily maxima. It is explicit about the limits of this: "it is not recommended that induced environments be calculated where less than five years of recorded data are available, and should not be calculated if less than one year of data are available." Where that data does not exist, the same section gives fallback induced diurnal cycles for every climatic category to use instead.
AECTP-230 names no certification, audit or inspection body, and it should never be described as something a supplier is "certified against." What actually gets checked later is whether a design was tested to the severities the project's own requirements document set, using the named AECTP-300 method, and whether that test record can be produced: the specific climatic category cited, the clause the severity came from, and the resulting test report. Whether that check is a government quality assurance surveillance, a design review, or a customer audit is set by the contract and the customer's quality clause, not by this document.
AECTP-230 explicitly excludes climatic effects arising from accident, hostile action, or nuclear effects. Its own leaflets state that they "are not intended to be comprehensive," and the 2311 series states plainly that it does "not prescribe tests or trials schedules." Nowhere does the document set a pass or fail threshold: every severity is offered "where possible" or "in the absence of measured data," with specifically measured data from the actual application always the preferred source.
AECTP-230 is an operational and technical standard, not a management-system standard: meeting it is engineering work, thermal analysis, requirements drafting, and environmental qualification testing, carried out by a design authority or test house. That work happens in the engineering process itself, not inside a compliance tool, and ComplyTrain does not do it for you.
What ComplyTrain does for this kind of work generally: hold the Environmental Requirements Document and Life Cycle Environmental Profile as controlled documents with a version history so everyone works from the current one; keep a record of which climatic category and which AECTP-300 test method was selected for a given requirement, and the clause cited to justify it; store the resulting qualification test reports and an asset manager's field-data logs as evidence that can be produced on request; and train engineers on the document-control and requirement-traceability process that surrounds a technical standard like this one.
ComplyTrain does not perform the thermal or environmental engineering analysis, does not run or simulate any climatic test, and does not decide which climatic category or test severity applies to a given item. Those are engineering judgements for a design authority or test house to make. The tier that applies to a given programme, and the wider set of AECTPs and STANAGs that come with it, are set by the contract and the customer's quality clause, not by this page. Use the standards explorer to see what sits alongside AECTP-230, and if you want to talk through how the document-control side of a programme like this fits around your existing engineering process, get in touch.
Tell us how you need to work with AECTP-230 and what you need from it. We will come back to you about what ComplyTrain can do.
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Not on its own. It is technical reference data, not a legal requirement. It reaches a nation through ratification of STANAG 4866, and it reaches an individual supplier only when a specific requirement document or contract calls it up.
AECTP-230 describes climatic conditions and the data behind them: what temperature, humidity, pressure or dust level a piece of materiel might meet, and where. AECTP-300 is the companion publication that holds the test methods and procedures used to simulate those conditions in a laboratory. AECTP-230 tells you what severity to test to; AECTP-300 tells you how to run the test.
Edition B, Version 1, promulgated in June 2025. It supersedes Edition 1, and carries no change to technical content, only an updated introduction, a corrected table, and refreshed climatic-category maps.
No such certification exists to hold. AECTP-230 names no certification body and describes no conformity scheme; nothing, including a compliance tool, can be "AECTP-230 certified."
NATO publishes AECTP-230 free of charge through the NATO Standardization Document Database, and it is not sold. See the explorer entry for the current source link, and credit NATO if you reproduce anything from it.
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