AASSEP-06 low pressure air engine starting connector

What it is

AASSEP-06, Low Pressure Air and Associated Electrical Connections for Aircraft Engine Starting, is a short NATO Allied Technical Publication. It standardises the electrical connector used when an aircraft is started with low pressure air from ground equipment: the connector's physical form and where it sits on the aircraft, the clearance space a technician needs to connect and disconnect it, its circuit arrangement, and the electrical tolerances the circuit has to hold. It is covered by STANAG 3372, the NATO agreement by which nations record their commitment to use it. Edition A, version 1 was promulgated in November 2014.

A connector two ground crews can share

The point of an interface standard like this one is ordinary but easy to miss: it exists so that a ground crew from one NATO nation can start an aircraft belonging to another using their own equipment, because both sides built to the same connector. AASSEP-06 does not name an audience in so many words, its requirement clauses simply fall on whoever builds each half of the connector: the airborne connector fitted to the aircraft structure, and the ground cable connector on the trolley or cart that supplies the starting air. Get the interface wrong on either side and the two halves will not mate, which is exactly the outcome a shared standard is written to prevent.

How it binds

AASSEP-06 does not bind a supplier by existing. Its own promulgation letter records that nations' agreement to use it sits in STANAG 3372, and the publication becomes effective for a nation once that agreement is in place. From there it reaches an individual manufacturer the way most NATO technical publications do: through a tender or a contract that calls up AASSEP-06 or the STANAG that covers it, not automatically. Because it governs the physical and electrical shape of a connector, it is a design-stage document. Getting the interface right before a connector design is finalised is straightforward; correcting it once aircraft or ground carts are already built is not.

What it requires

AASSEP-06 covers four things, in two short chapters. Where electrical control from the aircraft to the ground equipment is needed, the airborne connector has to conform to the dimensions the document sets out in its first annex, and the ground equipment's connector has to be compatible with it, with the ground cable connector itself being of the quick-disconnect type. A minimum clearance space around the aircraft's connector, enough to connect and disconnect it safely, is set out in a second annex. The circuit itself has a fixed arrangement across the connector's contacts, including one contact whose function differs between UK and US aircraft wiring practice. And the electrical circuit is bound by three standing tolerances: a limit on the voltage drop along each current-carrying connection, a limit on the temperature rise of any contact, and a permitted range for how far the electrical connector may sit from the centre line of the air connection that ISO 2026 defines. This page does not reproduce the dimensions, clearances or tolerance figures themselves, or the connector's pin assignments: those are exactly what a connector builder buys the document for, and they belong in the document's own tables, not paraphrased here.

Where ISO 2026 fits

AASSEP-06 is the electrical half of a larger interface. Its own related-documents clause names ISO 2026, the civil standard covering the corresponding air connection, and the electrical specification positions this connector relative to that standard's centre line. A supplier building the full interface needs both documents, not AASSEP-06 alone.

How it is checked

AASSEP-06 names no certification, audit or inspection mechanism, and no body is described anywhere in the text as checking a manufacturer's conformance against it. Meeting the standard is a matter of building a connector to the dimensions, clearances and electrical tolerances it and its annexes set out, and holding the design and verification records that show that was done. There is no accredited certification body, government surveillance arrangement or notified-body assessment attached to this document.