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AASSEP-12
Aircraft servicing and maintenance personnel who fit witness (breaking) wire to emergency controls and equipment
AASSEP-12 is NATO's agreed specification for witness (breaking) wire, used to temporarily lock aircraft emergency controls and equipment so ground crew can see if it has been operated.
AASSEP-12, the Allied Aircraft Servicing and Standard Equipment Publication on witness (breaking) wire, is NATO's agreed specification for a wire used to temporarily lock aircraft emergency controls and equipment: break the wire, and it is immediately visible that the control has been operated or the equipment opened. It is covered by STANAG 3752, the NATO agreement by which participating nations commit to using it, rather than a separate technical layer on top of it. Edition A, version 1 was promulgated in May 2024.
The publication's own aim (clause 1.2) is to standardize the material, dimensions and mechanical requirements of witness (breaking) wire when it is used for this kind of temporary locking. The agreement itself (clause 1.3) leaves the wire's material optional, fixes a maximum breaking load and a minimum diameter for the hole the wire passes through, and sets an approach to colour identification: an unprotected clear copper wire needs no distinguishing colour, but a colour coating required by national regulation must contrast recognisably with the locking material. This page does not print the specific breaking load or hole diameter the clause sets; reproducing a NATO publication's own technical text is a licence condition, and the current clause is the authoritative source for anyone sourcing or fitting the wire.
Clause 1.3(e) allows ISO 244:1979, "Aircraft – Sealing wire", to be used in place of the STANAG's own specification. Four participating nations go further and have recorded specific reservations against the base agreement: Bulgaria excludes Su-25K/UBK aircraft entirely, and Canada, Norway and Slovakia each reserve the right to fit wire prescribed by the aircraft's original equipment manufacturer where it does not conform to the STANAG, with Norway's reservation extended to aircraft purchased in future. Whichever specification is actually fitted, that choice has to match what the relevant nation has ratified or reserved.
Independently of the wire agreement, AASSEP-12 carries a general security clause headed "Defence Against Terrorism": aircraft equipment and materiel must be labelled, processed and stored so as to prevent access and tampering by unauthorized personnel, such equipment is inspected and certified before it is used or applied, and servicing and maintenance of aircraft is restricted to authorized personnel. The document does not explain why a wire specification also carries this clause; the two requirements simply sit together in the same short document.
AASSEP-12 speaks to the practice of servicing and maintaining aircraft rather than naming a manufacturer or a national authority directly; its security clause states that this work "shall be performed ONLY by authorized personnel". It binds through national agreement: participating nations record their commitment to use it in STANAG 3752, and the publication itself is effective upon receipt once that agreement is in place. For a supplier or a maintenance organisation, it reaches them the way an Allied Publication normally does, through a national requirement or a contract that names it, not because the document exists on its own.
AASSEP-12 names no certification, audit or accreditation scheme, and no body is described as assessing an organisation's compliance with it. Where the document uses the word "certified", it describes a check on a piece of equipment before use, not on an organisation: relevant equipment is inspected and certified for operational integrity and reliability before it is used. There is no accredited certification body, government surveillance arrangement, or notified-body assessment described anywhere in the text.
AASSEP-12 is published by the NATO Standardization Office and, like every NATO standardization document, carries no charge. The Standardization Document Database is the authoritative source, and a national standardization authority can also supply a copy. We credit NATO for the catalogue and neither sell nor host a copy ourselves.
AASSEP-12 describes work that happens on the ground and in the hangar, not in software: fitting witness wire, choosing the right specification for a given aircraft, and handling aircraft equipment securely is not something a compliance platform does. What an organisation needs to show is that its own servicing procedures reflect the publication or the relevant national reservation, that the people who service and maintain aircraft are identifiable as authorized, and that it can produce a record of that authorization alongside the equipment inspections the security clause describes. ComplyTrain holds those procedures as controlled documents, tracks the training and authorization records that identify who is entitled to service and maintain an aircraft, and gives an auditor a trail from the documented procedure back to the record of who was authorized to follow it.
ComplyTrain does not fit or inspect witness wire, certify a piece of equipment before use, or decide which specification or national reservation applies to a given aircraft. That work, and that judgement, stays with the ground crew and the contracting parties.
Which wire specification and reservation apply to a given contract, and whether AASSEP-12 or a national equivalent is in force, is set by the contract and the customer's quality clause, not by us. Use the explorer to see what sits alongside AASSEP-12 in a given programme, and talk to us about how we help evidence compliance with documents like it.
Tell us how you need to work with AASSEP-12 and what you need from it. We will come back to you about what ComplyTrain can do.
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Not by itself. AASSEP-12 binds a nation once it has agreed to STANAG 3752, the NATO agreement under which nations commit to use the publication. Whether it applies to a specific supplier or contract is a matter for the contract and the customer's quality clause.
This page does not print the clause's specific figures. AASSEP-12 sets a maximum breaking load and a minimum hole diameter in clause 1.3, and four participating nations have recorded reservations letting them use manufacturer-specified wire instead, so the detail is not necessarily uniform across nations. The current text of clause 1.3 is the authoritative source for anyone building or supplying witness wire.
Yes. Clause 1.3(e) names ISO 244:1979, "Aircraft – Sealing wire", as an equivalent that participating nations may use in place of the STANAG's own material and dimensional agreement.
No. The document names no certification, audit or accreditation scheme. Where it uses the word "certified", it refers to inspecting a piece of equipment before use, not to assessing an organisation, and there is no accredited body, government surveillance arrangement, or notified-body assessment described in the text.
STANAG 3752 is the NATO Standardization Agreement that covers AASSEP-12. It is the mechanism by which participating nations commit to this Allied Publication, rather than a separate technical requirement on top of it.
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