STANAG 3609 fixed aviation fuel system maintenance

What it is

STANAG 3609 is the NATO Standardization Agreement on standards for maintenance of fixed aviation fuel receipt, storage and dispensing systems. Edition 6, promulgated on 3 May 2019 and sponsored by NATO's LC, OEC and PHEWG committees, covers the publication AFLP-3609(A).

NATO has not released STANAG 3609 publicly. This page describes it from a public national implementation, the Czech defence standard ČOS 999908 (3rd edition, 2022), which states that it introduces STANAG 3609 edition 6 and AFLP-3609(A) into Czech use. 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 999908 sets minimum time standards for the periodic inspection, maintenance and repair of fixed equipment used across NATO member states to receive, store and dispense aviation fuel; the terminology, characteristics and technical description of that equipment are explicitly outside its scope. The standard is organised in three parts: requirements for preventive and service maintenance and inspections, the time intervals at which they must be carried out, and instructions for entering, inspecting, cleaning and repairing fuel storage tanks.

The maintenance requirements cover thirteen elements of a fixed system: the surrounding area, storage tanks, pumps of all types, filter stations, dispensing points for tanker trucks and hydrant systems, mechanical loading arms (pantographs), flexible rubber hoses, automatic control valves, piping, electrical wiring, the cathodic protection system, environmental protection, and the backup power generator. Written maintenance procedures must be prepared and approved for each, maintenance staff must be trained on the installed equipment and on the rules for handling fuel and for workplace safety, and each piece of equipment is classified, numbered and given its own dated record of inspections, maintenance, repairs and modifications.

Time intervals set for these elements run from daily to annual depending on how heavily each is used. A separate table sets the maximum interval between full internal inspections and cleanings of a storage tank: between 3 and 8 years, depending on the tank's role and on whether it has an internal protective coating and an inlet filter-separator.

For entering and cleaning a tank, the Czech implementation assigns responsibility to national maintenance organisations and sets out the personal protective equipment required, including breathing apparatus, protective clothing and a safety harness, and the minimum air quality before staff may enter without breathing apparatus: benzene vapour below 1 ppm and oxygen above 19%. It adds further precautions for tanks that stored leaded aviation gasoline.

Some of this is plainly national rather than NATO's own requirement: the Czech implementation frames its scope around Czech law (zákon č. 309/2000 Sb.) and around fuel stores held by the Czech State Material Reserves Administration (SSHR), rather than stating a scope of its own.

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Other standards in Fuels, lubricants and petroleum handling

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