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STANAG 3682
STANAG 3682 electrostatic safety connections for aircraft fuelling
Suppliers of aircraft fuelling and ground-support equipment, and the crews who ground and bond it during aircraft fuelling and defuelling.
STANAG 3682 sets NATO's electrostatic safety connection procedures for handling aviation fuel and for fuelling and defuelling aircraft. NATO has not released it publicly; this page describes it from the Czech defence standard that implements it.
- Edition
- 6
- Published
- 2017-08-16
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 3682 is the NATO Standardization Agreement on electrostatic safety connection procedures for aviation fuel handling and liquid fuel loading and unloading operations during ground transfer and aircraft fuelling and defuelling. Edition 6, promulgated in August 2017 under NATO's LC, OEC and PHEWG committees, covers the publication AFLP-3682 edition A. AAEP-02, the NATO publication for the related STANAG 3632, states: "Specific details on grounding and bonding operations are covered in STANAG 3682."
NATO has not released STANAG 3682 or AFLP-3682 publicly. This page describes them from a public national implementation, the Czech defence standard ČOS 999907 (3rd edition, effective 21 January 2025). ČOS 999907 introduces two NATO agreements into Czech use together: STANAG 3632 (AAEP-02(B)), on electrical connections for static grounding, and STANAG 3682 (AFLP-3682(A)). Its own scope statement, from the Czech defence standards index, is that it sets out procedures for electrostatic safety when handling all types of liquid fuel at air bases and elsewhere, and when refuelling or defuelling aircraft; it does not apply to refuelling ground vehicles or ground equipment. 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 for grounding aircraft during fuelling
ČOS 999907 requires an aircraft to be grounded to a static grounding point whenever its fuel tanks are filled or emptied on the ground, for the safety of the crew and the aircraft. It defines a static grounding point as one with an impedance of less than 10^4 Ω to earth, fitted with either a ring for a crocodile-clip cable or an 8 mm threaded stud with a wing nut, and marked with a yellow circle 200 mm to 500 mm across, with an optional black border. Grounding points must sit no more than 1,065 mm from the centre of the aircraft's fuel filler neck, and where the aircraft has a grounding socket instead, the socket bore must be 6.38 mm to 6.43 mm, to ISO 46.
The Czech Republic acceded to STANAG 3682 edition 6 with a reservation, which concerns how a grounding point's maximum impedance is measured against the aircraft's airframe structure; article 6.2.2 of ČOS 999907 reflects it. ČOS 999907 also sets cable specifications: a ground equipment bonding cable must be at least 20 m long with a resistance not exceeding 10 Ω, made of a flexible stainless-steel conductor bundle with orange insulation for visibility, and terminated in a jack-type plug to dimensions the standard tabulates; an aircraft bonding cable should not exceed 12 m, and the resistance of the complete cable and both terminations must not exceed 10 Ω.
What the Czech implementation covers for fuelling operations
Beyond the hardware, ČOS 999907 sets out when and in what order ground crews connect and disconnect bonding cables around a fuelling or defuelling operation, requires additional grounding for an aircraft whose engine is running, and requires a filling system's cathodic protection to be kept electrically isolated from the fuel-handling equipment it serves. It also applies to approved military aircraft maintenance organisations, not only to refuelling crews, and it requires hazard-area signage and marked exclusion zones around filling and dispensing sites.
How we help
A supplier bound by STANAG 3682 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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