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STANAG 4106
STANAG 4106 ballistic similarity of indirect-fire ammunition
Manufacturers of NATO indirect-fire (artillery and mortar) ammunition, and the national procurement and fire-control authorities that need one member nation's ballistic data to work with another's guns without extra verification firing.
STANAG 4106 sets out how NATO nations determine whether their indirect-fire ammunition is ballistically similar enough to share aiming-data corrections. NATO has not released it publicly; this page describes it from the Czech defence standard that implements it.
- Edition
- 3
- Published
- 1995-02-08
NATO has not released this STANAG publicly. It is NATO UNCLASSIFIED, and organisations that need it obtain it through their national standardization authority.
What it is
STANAG 4106 is the NATO Standardization Agreement covering procedures to determine the degree of ballistic performance similarity of NATO indirect fire ammunition and the applicable corrections to aiming data. Edition 3, promulgated in February 1995, sponsored by CNAD, AC/225 NAAG, ICGIF.
NATO has not released STANAG 4106 publicly. This page describes it from a public national implementation, the Czech defence standard ČOS 102504 (2nd edition, Prague 2022), which states that it introduces STANAG 4106 edition 3 into Czech use, replacing ČOS 102504's 1st edition. A national implementation can add national requirements and reservations, so treat what follows as the Czech implementation's content, not as NATO's own text.
What the Czech implementation covers
ČOS 102504 sets out procedures for determining the degree of similarity between the ballistic characteristics of indirect-fire ammunition, so that ballistic data established in the Czech Republic can be used by another NATO nation's fire-control systems without further verification firing. It applies to indirect-fire ammunition the Czech armed forces newly develop or introduce for their own inventory where use by other NATO nations is anticipated, and it explicitly excludes direct-fire weapon systems, anti-aircraft weapon systems and pyrotechnic ammunition.
The standard groups the possible outcome into four categories: ballistic match, ballistic similarity within 1% of range, ballistic similarity within 5% of range, and similarity not established or greater than 5% of range. The degree of interchangeability may be established by one of three methods: comparative ballistic firing of the two ammunition sets, ballistic firing measured by trajectory radar, or simulation validated against firing results. Whichever method is used, the findings are documented in a report identifying the weapon and ammunition combination tested, the comparison method applied, the degree of similarity established and its corresponding aiming-data corrections, and the range of elevations the comparison covered.
A public NATO test-methodology publication, AAS3P-23, cites STANAG 4106 as the basis for assessing whether ammunition variants remain ballistically compatible when a munition is introduced for use with an additional weapon or fire-control system, including projectiles that share an external shape but differ in payload or fuze.
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A supplier bound by STANAG 4106 through a contract holds the obtained text through its national authority. In ComplyTrain you record the requirements that apply to you as your own requirements, give each an owner, and keep the evidence that shows you meet them against each one.
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