STANAG 3224: Aircraft Interior and Exterior Lighting, NVG and Non-NVG Compatible
STANAG 3224 establishes criteria for aircraft interior and exterior lighting across NATO. It covers navigation, position, formation and anti-collision lights on the outside of the aircraft, aircrew station lighting on the inside, warning, caution and advisory signals, and emergency escape and evacuation lighting.
Crucially, it sets criteria for both non-NVG lighting and NVG compatible, also called NVIS compatible, lighting. Edition 7 was published in 2005 and runs to 65 pages, which makes it one of the more substantial NATO lighting agreements.
What STANAG 3224 Covers
The aim of the agreement is to establish criteria for aircraft interior and exterior lighting. Both halves are in scope, and for each the standard addresses conventional lighting and night vision compatible lighting as separate cases rather than treating one as a variation of the other.
It is worth being precise about what exterior lighting means here, because the term is used loosely elsewhere. In STANAG 3224 it refers to aircraft navigation, position, formation and anti-collision lights. It is not a general term for anything mounted outside the airframe.
The agreement also covers aircrew station warning, caution and advisory signals, in both NVG and non-NVG forms, and emergency escape and evacuation lighting. That last item is easy to overlook at specification stage and difficult to retrofit.
What Falls Under the Standard
Every one of those four is specified twice, once for conventional use and once for NVG compatibility. That doubling is the reason the document runs to 65 pages, and it is the reason a lamp cannot simply be dimmed to become compliant.
Why NVG Compatibility Is a Separate Requirement
Night vision goggles amplify light in a band that extends beyond what the eye uses. Their sensitivity reaches into the near infrared, well past the red end of the visible spectrum, and they amplify by a factor of many thousands.
The consequence is that a cockpit lamp can look dim to the crew and still saturate the goggles. Ordinary red instrument lighting is the classic case: it appears subdued to the naked eye while sitting squarely inside the band the goggles are most sensitive to. Compatible lighting works the other way round, using wavelengths the eye sees well and the goggles largely ignore.
So NVG compatibility is not a matter of reducing output. It is a matter of moving the output out of the goggles’ band while keeping it visible to an unaided eye looking under or around the goggles. That is why it requires its own criteria and its own qualification, and why a dimmer is not a solution.
The US equivalent requirement is MIL-STD-3009, which defines NVIS compatibility and the NVIS colour classes. Programmes frequently name both, and the two are closely related but not identical, so confirm which governs acceptance.
Related NATO Agreements
STANAG 3224 sits in a group of agreements that reference one another, which matters when a specification cites only one of them.
| Agreement | Subject |
|---|---|
| STANAG 3224 | Aircraft interior and exterior lighting, NVG and non-NVG compatible |
| STANAG 3800 | Night Vision Imaging System interior lighting compatibility design criteria |
| STANAG 7197 | Use of night vision goggles during NATO air transport operations |
| STANAG 7215 | Air-to-air refuelling signal lights in hose and drogue systems |
| STANAG 3705 | Human engineering design criteria for controls and displays in aircrew stations |
A note on editions. The 1999 edition of STANAG 3224 was titled Aircrew Station Lighting and covered non-NVG lighting only, with warning, caution and advisory lights handled separately under STANAG 3370. The 2005 edition brought exterior lighting, NVG compatibility and the warning signals together into one document. If you are working from older documentation, confirm which edition it refers to before assuming the scope.
What This Means for Equipment
The scope of STANAG 3224 maps directly onto the lighting fitted to a military aircraft, and each of the four areas carries its own products and its own qualification evidence.
On the exterior, the standard governs position lights, formation lights and anti-collision strobes. Formation lighting is the one where NVG compatibility is least optional, since the entire point of flying formation at night is that the other aircraft can see you through goggles while nobody on the ground can.
Inside, it covers cockpit utility lighting, dome and cabin lighting, and the safety signs and comparators used to verify that a marking is reading correctly. Emergency escape and evacuation lighting is covered too, which is where self-luminous exit signs earn their place, because they work with no power at all rather than depending on the system that has just failed.
Our full aviation lighting range covers interior and exterior fits. For environmental qualification, which is a separate question from lighting performance, see DO-160.
Frequently Asked Questions
Criteria for aircraft interior and exterior lighting, in both NVG compatible and non-NVG forms. Exterior lighting means navigation, position, formation and anti-collision lights. The agreement also covers aircrew station warning, caution and advisory signals, and emergency escape and evacuation lighting. Edition 7 was published in 2005.
No. It is an aircraft lighting agreement. Blackout and tactical lighting on military vehicles is covered by STANAG 4381 instead. The two are occasionally confused because both concern military lighting and night vision compatibility, but they apply to different platforms and carry different requirements.
STANAG 3224 is the NATO agreement covering aircraft interior and exterior lighting, including NVG compatibility. MIL-STD-3009 is the US standard defining NVIS compatibility and the NVIS colour classes. They address the same underlying problem and are closely related, but they are separate documents. Programmes often cite both, so establish which one governs acceptance before building to either.
Because goggles are sensitive into the near infrared, beyond what the eye uses, and they amplify heavily. A red instrument lamp can look subdued to the crew while sitting inside the band the goggles are most sensitive to, so dimming it reduces what the crew sees without solving what the goggles see. Compatible lighting uses wavelengths the eye reads well and the goggles largely ignore, which is a design decision rather than a brightness setting.
Edition 7, published 2005, is the current one and has status Current in the standards registers. The previous edition from 1999 was titled Aircrew Station Lighting, covered non-NVG lighting only, and handled warning and caution lights separately under STANAG 3370. If a specification cites STANAG 3224 without an edition, and the surrounding requirements look narrower than aircraft-wide, check which edition was intended.
Yes. Emergency escape and evacuation lighting is within scope, in both NVG and non-NVG forms. It is worth addressing early, because emergency lighting has to work when the electrical system does not, and self-luminous marking is often the practical answer for that reason rather than for cost.