Max-Viz Enhanced Vision Systems FAQ
How EVS Works and EVS Specifications
- Dimensions: Camera: 2.8″ (71mm) diameter x 6.8″ (172 mm) length Power Module: 3.75″ (95mm) width x 5.0′ (127mm) height x 2.25″ (57.2mm) depth
- Weight Camera: 2.5 Lbs (1.13kg) Power Module: 2.65 Lbs (1.20kg)
EVS and EFVS Regulations:
- FAA EFVS Advisory Circular 90-106 AC No 90-106
- FAA FAR-91-175 FAR 91-175
- FAA June 2013 to amend 91-175 Amended 91-175
Regulatory Position Papers:
- NTSB Safety Alert SA_013 2008 Alert SA-013
How EVS Compares To or Is Used In Conjunction with Other Systems
NVG’s and EVS systems are entirely different. Each system has its own strengths and weaknesses. EVS systems utilize thermal imagery based upon Infrared sensors "microbolometers " that are heat sensitive and can detect temperature changes of less than 1/10th of 1 Degree C. These sensors detect Long-Wave Infrared (LWIR), Short-Wave Infrared (SWIR), or Mid-Wave Infrared (MWIR) energy, depending upon the manufacture and type of sensors being utilized. Astronics Max-Viz EVS systems utilize un-cooled LWIR microbolometer based sensors that detect energy in the 8-12 micron range, presenting that energy in a black and white "video appearing" format. This image can be displayed in the cockpit on dedicated displays as well as many multi-function, primary flight or primary navigational displays. The EVS image can also be presented in cabin displays as desired by the end-user.
Night Vision Goggles use light-amplifying technology. This technology takes the small amount of light that is available in the surrounding area (such as moonlight or starlight), and converts that light energy (scientists call it photons) into electrical energy (electrons) presenting an enhanced visible image to the pilot. These electrons pass through a thin disk that’s about the size of a quarter which contains more than 10 million channels. As the electrons go through these channels, they strike the channel walls and thousands more electrons are released. These multiplied electrons then bounce off of a phosphor screen which converts the electrons back into photons presenting a green- hued amplified re-creation (think T.V.) of the scene being observed through the NVG eyepiece.
NVGs are operationally effective at night and will not work in complete darkness without additional IR illumination. NVG’s can only be utilized during the day with training filters and prolonged use is not recommended since it can damage the image intensifier. New Gen 3 and Gen 4 NVG technology is very good and it is possible to see through thin / light obscurations such as smoke, haze, smog and fog. However, it is important to note that NVG’s may actually be lulling you into a false sense of security, since these conditions may be deteriorating to a point where visibility through the goggles is no longer possible. Continued flight into denser atmospherics can result in the NVG’s shutting down and leaving the pilot unaided in an Inadvertent Instrument Meteorological Condition (IIMC) scenario. NVG’s cannot see through dust, heavy snow, heavy rain. Degraded NVG operations can also occur in mountainous terrain due to shadow’s affecting the NVG’s ability to gather light. NVG’s can also subject to dimming during periods of high illumination that could be caused by bright moon light, ambient light from large cities or high intensity search lights. Aircraft cockpit lighting, internal lighting, and external lighting, must also be modified for use with NVG’s so that they do not cause interference or degrade NVG viewing capabilities.
FAA Rulings on EVS
Yes. This announcement will generate more discussion about EVS and we suspect the non-HUD providers will get actively involved in trying to get the ruling amended to include other kinds of devices. All of this discussion will find its way into the news and that means that more people will become aware of the current and potential benefits of EVS.
Questions About the Value and Financial Justification for EVS
EVS Export Information
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Astronics Max-Viz Sales Assistance:
If you need further information, contact Astronics Max-Viz sales.
Export Administration Regulations:
U.S. Government BIS-711 form:
Contact Astronics Max-Viz
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