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STANAG 3967
STANAG 3967 aviation turbine fuel filter separators
Manufacturers of aviation turbine fuel filter-separator vessels and coalescer and separator filter elements, and the defence and airfield fuel-handling buyers who specify them.
STANAG 3967 sets NATO's design and performance requirements for aviation turbine fuel filter separator vessels and their coalescer and separator filter elements. NATO has not released it publicly; this page describes it from the Czech defence standard that implements it.
- Edition
- 3
- Published
- 2017-04-11
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 3967 is the NATO Standardization Agreement on design and performance requirements for aviation turbine fuel filter separator vessels and their coalescer and separator filter elements. Edition 3, promulgated on 11 April 2017 under NATO's LC, OEC and PHEWG committees, covers the publication AFLP-3967 edition A, which sets the minimum design, performance and qualification-test requirements so a filter-separator qualified in one nation protects aircraft fuelled through another's system.
NATO has not released STANAG 3967 or AFLP-3967 publicly. This page describes them from a public national implementation, the Czech defence standard ČOS 999912 (3rd edition, effective 15 July 2021), which states that it introduces STANAG 3967 edition 3 and AFLP-3967(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 covers
ČOS 999912 covers filter-separators and their coalescer and separator elements for flow rates up to 9,500 l/min (2,500 gal/min), in three fuel categories: Category C, for commercial turbine fuel and aviation gasoline; Category M, for military turbine fuel; and Category M100, for military turbine fuel carrying a thermal-stability additive. It also sets three types, by the water and solids a filtration point can expect: Type S, high free water and solids; Type S-LW, minimum free water; and Type S-M, minimum water and solids, restricted to aircraft-servicing equipment only and never stationary installations. It covers coalescer elements of nominal diameter 50 mm (2 in), 100 mm (4 in) or 150 mm (6 in), in vertical or horizontal vessels (50 mm elements only in horizontal, side-by-side vessels), threaded or free-end, in vessels holding more than one coalescer position; a single-position, low-flow vessel falls outside it. It bars filter-monitor systems, or elements acting as filter-monitors, on fuel containing the Di-EGME icing inhibitor, which it says can degrade such elements and release super-absorbent polymer into the fuel.
What the Czech implementation requires of a filter-separator
For output fuel quality, ČOS 999912 sets limits of 0.26 mg/l (1.0 mg/gal) total solid contaminant to ASTM D2276, 15 ppmv free water to ASTM D3240, and 10 fibres/l (38 fibres/gal) of filter media migration. A new two-stage vessel must not exceed 70 kPa (10 psi) differential pressure on clean dry fuel at rated flow, and coalescer elements and their seals must withstand 520 kPa (75 psi) without rupture, seal bypass or pinhole leaks. Metal parts touching fuel must exclude zinc, copper, cadmium and their alloys; filter-element metal parts must be stainless steel; seals must be Viton A, Buna N or an EI 1589 equivalent. Vessel design must meet EI 1596, and qualification runs through single-element and full-scale laboratory tests, a structural strength test, and EI 1589 compatibility testing, backed by a documented quality system to API SPEC Q1, ISO 9001 or ISO 10012 with annual conformance testing of each qualified model. A qualified filter-separator gets a unique model number; the manufacturer may not then change its design, materials or process without the user's agreement, and the user can require partial or full requalification if performance is in doubt.
How we help
A supplier bound by STANAG 3967 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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