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STANAG 3583
Makers of differential pressure gauges for aviation fuel filters and filter-water separators, and the operators of fixed and mobile aviation fuel installations who specify and maintain them.
STANAG 3583 sets accuracy, construction and calibration requirements for the differential pressure gauges fitted to aviation fuel filters and filter-water separators. NATO has not released it publicly; this page describes it from the Czech implementation that carries it.
NATO has not released this STANAG publicly. It is NATO UNCLASSIFIED, and organisations that need it obtain it through their national standardization authority.
STANAG 3583 is the NATO Standardization Agreement on standards for differential pressure gauges used on aviation fuel filters and filter water separator vessels. Edition 4, promulgated in October 2013 under NATO's fuels standardization bodies (LC, OEC, PHEWG), covers the publication AFLP-3583, edition A. It sets accuracy, construction and testing requirements for the differential pressure gauges fitted to aviation fuel filter and filter-separator bodies at stationary and mobile fuel installations that refuel aircraft.
NATO has not released STANAG 3583 or AFLP-3583 publicly. This page describes them from a public national implementation, the Czech defence standard ČOS 999924 (2nd edition, amendment 1, 2023), which states that it introduces STANAG 3583 edition 4 (AFLP-3583(A)) into Czech use, with two reservations: differing national calibration requirements, and the irrelevance of a clause on military naval vessels, which the Czech Republic does not operate. 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.
Per ČOS 999924, the gauges monitor the differential pressure across filter elements: a rising reading shows the elements are clogging with solid particles and water and that contamination has been removed from the fuel, while an abnormally low or zero reading can mean a coalescer element is fitted wrongly, cracked, or that a gauge valve has been left in its test position. The Czech implementation gives two example readings from a typical coalescer performance graph: at a flow of 1,200 l/min (264 imp gal/min), element replacement is indicated by a maximum differential pressure of about 0.75 bar (10.5 psi); at 1,600 l/min (352 imp gal/min), about 1 bar (14.5 psi).
For new or modernised stationary and mobile fuel installations, only piston-type differential pressure gauges may be fitted to filters or separators; dial or Bourdon-tube gauges already in service may stay in use until they fail or are damaged. Gauges must give a direct reading in both kPa and psi without needing to manipulate control valves, be unaffected by positive and negative pressure surges, and carry a built-in protective filter of up to 10 microns. They must be of robust construction suited to mobile and stationary mounting and rated to a maximum operating pressure of 20.6 bar (300 psi); filter bodies must be aluminium alloy or stainless steel, and copper or copper alloys of 4% copper or more are barred wherever they could contact the fuel or its vapours. A piston gauge's tube must be high-strength glass tested to at least 1,200 psi, with a piston whose thermal expansion matches the glass, nickel-plated unless it is already made from a stainless material.
Accuracy must be within plus or minus 2 psi (0.1379 bar or 14 kPa), on a scale divided in 1 psi (0.06 bar or 7 kPa) steps, verified using NATO code F-34 or JET-A1 aviation kerosene at 20°C ± 5.6°C (68°F ± 10°F). Under a Czech national note, dial and Bourdon-tube gauges are calibrated annually while piston-type gauges are not subject to mandatory calibration, a national reservation on how the agreement is applied rather than a NATO requirement itself.
A supplier bound by STANAG 3583 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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