STANAG 3212
STANAG 3212 diameters for gravity filling orifices
National authorities implementing NATO aircraft interoperability agreements, and the manufacturers whose contracts call up ISO 102:1990
NATO agreement committing member nations to size aircraft gravity fuel filling orifices and nozzles to the tables in ISO 102:1990, so refuelling equipment is interoperable across nations.
- Edition
- 7
- Published
- 2017-05-23
What it is
What STANAG 3212 covers
STANAG 3212 is a NATO standardization agreement, not a technical specification in its own right. Its interoperability requirement is to establish a minimum and/or maximum size of orifice for the gravity filling point of the aircraft tank or reservoir relative to each fluid, and a minimum and/or maximum size for the external diameters of nozzles used for the gravity filling of aircraft with fuel or other fluids. The actual figures are not in this document. Participating nations agree that internal diameters of orifices used for the gravity filling of aircraft "shall be in accordance with Table 1 of ISO 102", that external diameters of fuelling nozzles "shall be in accordance with Table 2 of ISO 102", and that nozzles used for other fluids must still fit the relevant minimum orifice diameter given in Table 1. ISO 102:1990 (Aircraft - Gravity Filling Orifices) carries those tables; STANAG 3212 is the NATO agreement that makes following them a national commitment.
This is Edition 7, promulgated 23 May 2017, which supersedes Edition 6 of STANAG 3212.
How it binds
A STANAG does not bind a supplier by existing. It binds a nation once that nation has ratified it, and a nation treats it as implemented once it has issued instructions that all future aircraft will be in accordance with this agreement - new aircraft going forward, not a retrofit of an existing fleet. Partner nations are separately invited to adopt it, without a ratification obligation. Nations record their ratification and implementation position in the NATO Standardization Document Database, and may report on it using the forms in Annex H (for members) or Annex G (for partners) to AAP-03 - a reporting mechanism, not a technical requirement of the STANAG itself.
For a supplier or manufacturer, the document does not create an obligation on its own. It becomes relevant once a contract, a tender, or a national requirement calls up STANAG 3212 or ISO 102:1990 directly for a given aircraft or fuel-system component.
What it does not cover
The STANAG names no other related document beyond ISO 102:1990 for its technical content - the "OTHER RELATED DOCUMENTS" section reads "None." It says nothing about fuel or fluid quality, fuelling procedure, or the rest of an aircraft's fuel system; it covers the size of the gravity filling orifice and the fuelling nozzle only. It carries no in-service or maintenance obligation, and it does not describe what should happen to an aircraft already built before a nation's implementing instruction takes effect.
Review
The STANAG is reviewed at least once every three years, with the result recorded in the NSDD, and nations or NATO bodies can propose changes at any time. The tasking authority for this STANAG is the Military Committee's air standardization body, MCASB.
How we help
Meeting STANAG 3212 in practice means specifying, during aircraft or fuel-system design, that a gravity filling orifice or fuelling nozzle follows the tables in ISO 102:1990, and being able to show that the decision was made and carried through: the drawing or interface control document that calls up the ISO 102 table, the design review record, and the change record if a later revision touched the interface. ComplyTrain gives a quality team a place to hold that kind of documented decision, the procedure or work instruction behind it, and the review and training records that go with it, alongside the rest of a defence quality system's evidence.
What ComplyTrain does not do: it does not measure an orifice or a nozzle, it is not a substitute for ISO 102:1990 as the source of the actual dimensions, and it does not verify a design's physical interoperability. That is engineering and inspection work carried out on the hardware and the drawings, not something a compliance platform can do in their place.
The tier and standards that apply to a given contract are set by the contract and the customer's quality clause, not by us. If STANAG 3212 or ISO 102:1990 sits alongside other NATO or civil aviation standards on a programme, the standards explorer shows what else is commonly required, and our team is glad to talk through how the supporting documentation fits together.
Questions
Is STANAG 3212 mandatory?
There is no general answer in the document itself. A STANAG binds a nation once ratified, and reaches a supplier through the contract or tender for a specific aircraft programme, not automatically. Whether it applies to a given supplier depends on what the contract and the customer's quality clause call up.
Does STANAG 3212 set the actual orifice and nozzle sizes?
No. STANAG 3212 commits nations to follow the tables in ISO 102:1990 (Aircraft - Gravity Filling Orifices); the dimensions themselves are set out in that document, not in the STANAG.
What happened to the previous edition?
Edition 7, promulgated 23 May 2017, supersedes Edition 6 of STANAG 3212. The letter of promulgation names the earlier edition but does not give its date.
Where do I get STANAG 3212 and ISO 102:1990?
STANAG 3212 is a NATO document, free of charge, available through the NATO Standardization Document Database. ISO 102:1990 is a separate civil standard, sold by ISO and by national standards bodies; it is not distributed by NATO or by us.