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AASSEP-10
Aircraft and ground-servicing-equipment manufacturers who build the pressure oil-replenishment connection and the equipment that services it
AASSEP-10 sets a common NATO fitting for pressure-replenishing gas turbine engine oil, built to ISO 451 or ISO 9939, so ground equipment from one nation can reoil another's aircraft.
AASSEP-10 is a short NATO Allied Aircraft Servicing and Standard Equipment Publication, promulgated in May 2024, that standardises one piece of an aircraft's design: the connection used to replenish a gas turbine engine's oil under pressure. Its aim, at clause 1.2, is to standardise that connection itself, not the practice of reoiling. The document is thin by design: almost all of its substance sits in one agreement clause, 1.3, because it works mostly by pointing at two civil connection standards and one NATO fuels-quality standard rather than restating their content.
Clause 1.3(a) requires the pressure replenishment connection to be built to ISO 451 or ISO 9939, and clause 1.3(b) states plainly that ISO 9939 "replaces and shall be used in lieu of ISO 451 for all new design" - so a newly designed aircraft or dispenser is expected to carry the newer connection, not the older one. The same clause fixes minimum performance for the servicing side: a fill pressure stated relative to atmospheric pressure, a minimum flow rate, a minimum dispenser capacity and a minimum delivery-hose length, each set as a specific figure in the document rather than left to a supplier's judgement. Clause 1.3(f) and (g) require the dispenser's filtration to be "to the standard stipulated in STANAG 3149" and its markings to carry "the NATO marking in accordance with STANAG 3149", NATO's minimum quality surveillance standard for fuels.
Clause 1.4, "Defence Against Terrorism", adds a general security requirement rather than anything specific to reoiling: equipment and materiel must be labelled, processed and stored to prevent unauthorized access or tampering, inspected and certified fit for use before each application, and serviced only by authorized personnel.
Nothing in AASSEP-10 addresses an inspector or a certification body. Its clauses of substance are addressed to whoever designs and builds the aircraft-side connection and the ground dispensing equipment that mates with it, and to the personnel who carry out the servicing itself.
It binds the way most NATO Allied Publications do: through the agreement nations record. AASSEP-10's own Letter of Promulgation states that "the agreement of nations to use this publication is recorded in STANAG 3595." A nation carries the obligation into its own procurement once it has ratified; a supplier meets AASSEP-10 because a contract, a type specification or a tender calls it up, not because it exists in NATO's catalogue. Two nations have recorded a reservation against it: Greece's delivery hose may fall short of the standard's minimum length, and Norway reserves the right not to modify its own existing equipment to comply, applying the requirement to future procurement only where the manufacturer has the capability to meet it.
AASSEP-10 names no certification body, audit cycle or inspection regime for the standard itself. Clause 1.4 does require equipment to be inspected and certified fit for use before each application, but that is a routine fitness check on the physical equipment, not an organisation being assessed or certified against AASSEP-10. Conformance is a design and engineering question: a connection either matches ISO 451 or ISO 9939, and a dispenser either meets STANAG 3149's filtration and marking requirement, or it does not.
AASSEP-10 depends on ISO 451 and ISO 9939 for the connection itself, both named at clause 1.1 and required at clause 1.3(a); clause 1.3(b) makes ISO 9939 the one to use for new design. Neither is in our catalogue at the time of writing, so both are named here rather than linked. It requires a dispenser's filtration and marking to follow STANAG 3149 at clause 1.3(f) and (g), which also lists the Allied publication it carries, AFLP-3149, among its related documents. AASSEP-10 is itself carried by STANAG 3595, the NATO agreement recording nations' agreement to use it.
AASSEP-10 describes a mechanical interface and a piece of ground servicing equipment, not a management system, so the work it demands is engineering and servicing: specifying the correct connection, building or selecting dispensing equipment to the standard's performance and filtration requirements, and handling that equipment under clause 1.4's security requirement. That work is done by an aircraft or ground-support-equipment manufacturer and by the personnel who service the aircraft, not by a compliance platform.
What ComplyTrain supports is the paperwork around that work: holding the design or procurement record that shows a connection was specified to ISO 451 or ISO 9939 and a dispenser to STANAG 3149's filtration and marking requirement, the sign-off from whoever checked it, and any national reservation or contract exception raised against it, in the way Norway's own reservation shows a customer might want tracked. It can also hold training records for the personnel clause 1.4 requires to be authorized before they service aircraft through this connection.
It does not fit the connector, set a dispenser's fill pressure, verify filtration, or decide whether a design conforms to ISO 451, ISO 9939 or STANAG 3149. Which standards and which tier of support apply on a given contract is set by the customer's quality clause. If AASSEP-10 sits alongside other requirements on a NATO airframe or ground-support programme, the standards explorer shows what else is in play, and we're glad to talk through how you'd evidence it.
Tell us how you need to work with AASSEP-10 and what you need from it. We will come back to you about what ComplyTrain can do.
Thank you. Your list is on its way to your inbox, and we will come back to you on what working with these standards in ComplyTrain involves, usually within one business day.
Only through the mechanism a NATO Allied Publication always uses: nations record their agreement to use it in a STANAG, in this case STANAG 3595, and a nation carries that into its own procurement once it has ratified. A supplier is bound where a contract, a type specification or a tender calls up AASSEP-10, not because the publication exists in NATO's catalogue.
STANAG 3595 is the agreement by which NATO nations commit to use AASSEP-10; AASSEP-10 is the technical publication itself, setting the pressure oil-replenishment connection requirement. AASSEP-10's own Letter of Promulgation records that the agreement to use it sits in STANAG 3595.
No. AASSEP-10 requires the connection to conform to ISO 451 or ISO 9939, and states that ISO 9939 is the one to use for new design. The dimensions themselves live in those two ISO standards, not in AASSEP-10.
No. AASSEP-10 names no certification body, audit or inspection process for the standard itself. Conformance is a design and engineering question, checked against ISO 451, ISO 9939 and STANAG 3149, not a scheme an organisation is certified against.
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