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STANAG 7063
STANAG 7063 detection and treatment of fuels contaminated by micro-organisms
Makers of fuel biocide additives and microbial fuel-contamination test kits, and the defence fuel-quality managers who specify and use them.
STANAG 7063 is the NATO agreement on detecting and treating fuel contaminated by micro-organisms. NATO has not released it publicly; this page describes it from the Czech defence standard that implements it.
- Edition
- 4
- Published
- 2025-02-04
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 7063 is the NATO Standardization Agreement on methods of detection and treatment of fuels contaminated by micro-organisms. Edition 4, promulgated on 4 February 2025 under NATO's LC, OEC, NFLWG committee, covers the publication AFLP-7063, edition B.
NATO has not released STANAG 7063 or AFLP-7063 publicly. This page describes them from a public national implementation, the Czech defence standard ČOS 999931 (second edition, amendment 2, effective from 14 January 2026), whose amendment record shows it updating the standard from STANAG 7063 edition 3 (AFLP-7063, edition A) to edition 4 (AFLP-7063, edition B). 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 requires
ČOS 999931 states that its purpose is to define rules for protecting equipment against the effects of fuel biocontamination, and to set out the tests for detecting it and the decontamination methods to be used in the Czech Republic. Under it, the Czech Republic undertakes not to distribute suspect products, to inform users of any biocidal additive in a product, and to use the detection tests and biocidal treatments the standard describes, or standardised detection methods that give more accurate results.
The standard distinguishes aerobic micro-organisms, which need oxygen, from anaerobic ones, which do not. Aerobic contamination can degrade fuel quality with corrosive acidic by-products, reduce the fuel's ability to shed water because biosurfactants from bacteria, moulds and yeasts keep it emulsified, clog filters with slime and fungal growth, damage filter elements, corrode tanks, and cause gauge failures. Anaerobic micro-organisms develop once aerobic ones have used up the available oxygen, and release corrosive by-products including hydrogen sulphide, ammonia and methane; contamination can lead to tank corrosion, toxicity, and fire or explosion risk.
For detection, an annex gives a table of test kits used across NATO countries and the levels each judges unfit for use; the Czech entry specifies the Easicult Combi kit, incubated for 96 hours, with the product judged unfit once bacterial or yeast counts pass the kit's stated levels or mould growth becomes more than negligible. For treatment, the standard sets out NATO's specification for a fuel biocide additive, NATO code S-1751: a qualifying product must contain a biocidal additive matching table 2 of ASTM D1655, and using it requires checking the additive's approval status and the conditions for the specific platform and system. Further annexed tables give the dosage, decantation time and maximum acceptable dose of biocide by country for land, air and naval forces; the Czech land-forces entry specifies the product Kathon FP1.5 at 100 ppm by volume, a 48-hour decantation, and the same figure, 100 ppm by volume, as the maximum acceptable dose. Separate annexes cover treatment of fuel held in bulk storage tanks, in the tanks of vehicles other than aircraft, in aircraft fuel tanks, and in ship fuel bunkers.
The reference to Czech Act No. 324/2016 Sb. on biocidal products and active substances, which the standard requires biocidal additives to comply with, and the cross-reference to the Ministry of Defence's own fuel quality document PHM-21-7, are national additions: they tell you what Czech law and Czech defence procedure require, not what every NATO nation requires.
How we help
A supplier bound by STANAG 7063 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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