Questions tagged [avionics]

Avionics is applied electronics to aviation. Radars, radios, instruments, dashboards, they all belong to this category.

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What is the CPIOM in the IMA?

What is the CPIOM in the IMA architecture. Which is the difference between the CPIOM in the A380 and the CPIOM in the B777?
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How do instructors simulate instrument failure in basic training aircraft with glass cockpits?

While working towards my private pilot's license in the United States in 2004-2005 (in a steam gauge only airplane), I very much remember my instructor covering one or more instruments to simulate ...
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Why does Airbus suppress stall warnings in certain situations?

I was reading about Air France 447 and came across the line: The stall warnings stopped, as all airspeed indications were now considered invalid by the aircraft's computer due to the high angle of ...
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398 views

How can avionics detect tailwind? [duplicate]

We can see the effect of the tailwind on the plane's flight direction on the modern military fighter jet huds. I wonder about how can the avionic systems detect tailwind and which sensors using in the ...
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Does every device/software, developed for use in the cockpit, need to be certified?

Every avionic, developed for use in the cockpit has to complete a long and expensive certification process. Is this only applying for avionics, installed fixed into the aircraft or also for apps like ...
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Are there common standards for aviation graphical user interfaces?

I'm searching for graphical user interface in aviation guidelines. Yet I miss the correct terms and I don't really know where to start. Let's take an example: what's the meaning of the green ...
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Why is the FOV of the Synthetic Vision of the Prodigy Flight Deck asymmetric?

Why is the FOV of the Synthetic Vision of the Prodigy Flight Deck asymmetric? I am just reading through the manual of the Prodigy® Flight Deck 100 and came to the chapter about the synthetic vision. ...
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236 views

DO-254 and microprocessors: how does it apply?

How does DO-254 apply to commercial processors? For instance, I've noticed that "DO-254 certifiable" processors exist. Does that mean that these were designed with inherent redundancy?
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Could TCAS be used as a backup source for position, attitude or air data?

Given the number of incidents related to freezing pitot tubes, is there any current/planned implementation to infer aircraft position/speed/attitude/bearing based on TCAS data as a last resort data ...
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How to decode ARINC 429 data?

I am looking for some help regarding decoding ARINC 429 data. I have a CSV document that contains sequentially stored ARINC 429 labels. My overall goal is to be able to scan for 4 specific labels and ...
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771 views

What causes a “BATT DISCHARGE” CAS message on the Phenom 100E?

In the Phenom100 POH the descriptions for the "BATT DISCHARGE" CAS message is "During a normal system operation, at least one battery is discharging." I'm a bit confused as to what exactly does ...
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Could a terrorist hack the ILS?

I'm reading all these reasons why consumer electronics can't be on during takeoffs and landings and one specific reference that is made over and over again is the sensitivity of the ILS equipment. I ...
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How are pitch angle and pitch rate measured in an airplane?

What equipment or method is used to obtain measurements of the pitch angle (θ) and pitch rate (q) during flight? Edit: I am asking about how the aircraft systems sense these quantities
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Which GPU (Graphics Processing Unit) is used to generate the graphics for avionics?

I guess it isn't the GTX 1080Ti. But which GPU(s) has the Boeing 737-NG for example? How does it differ from a GTX 1080Ti (cost: around €800), or Quadro P6000 (cost: around €7100)? How many GPU's are ...
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What Electronic Flight Display is this?

I just watched this video in which the avionics surprised me. It looks like a half Garmin G600, attached on his yoke. What is that and is it permanently attached to the yoke or is it portable? Could ...
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What exactly is a BITE?

I read that with each LRU or Module in the IMA it is associated a BITE, Built-in-test Equipment. Can you describe more in detail what it is and which is its scope?
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Why are general aviation avionics so expensive?

I am quite sure that someone already asked this question, but I couldn't find it on this site. Why are avionics for general aviation aircraft so expensive? For example: The Garmin® G5 $ 2,149.00 ...
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What's the UX in modern airliner avionics for diversion choices, and does it integrate to autopilot?

This question mentions a flight that had to divert, in that case to Iqaluit (YFB). I was wondering: in modern large airliners, what is the user interface like when diverting? How is the case of "what ...
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How to trigger warnings on an unplugged aural warning unit?

I got an old 80-0557-11 Rev A manufactured by Grimmes from an EMB-120 Brasilia, and I was wondering how to make it speak. I powered the component with a 28VDC power supply. It only said "Aural unit ...
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What's the difference between FMS and FMC?

What's the difference between FMS (Flight management System), and FMC (Flight management computer)? Can the flight management computer be thought of as what's manipulating the input information from ...
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Why are Flight Directors turned on so early?

I have noticed that the requirement to turn on the Flight Directors in a commercial aircraft is in one of the very first checklists. Why does this have to be the case when the Flight Directors are ...
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539 views

Why are callouts of changes in the Flight Mode Annunciator not automated?

With many airlines it seems to be standard that the Pilot Monitoring observes the Flight Mode Annunciator (FMA) and calls out any changes in the autopilot mode displayed on the FMA (I guess to raise ...
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How do virtual circuit breakers work?

In AW189, B787 and few other aircraft/helicopter, the physical breaker has been replaced by virtual breaker, which can be controlled by the MFD (Multi-Function Display). I tried to google the answer, ...
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Are the discrete I/O considered to be part of the ARINC interface?

A typical connection used to transmit/receive ARINC data might consist of a cable and a connector similar to the one shown below. Although ARINC transmit/receive channels aren't the only thing this ...
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Did the contemporaries of the F-14 also have automatic swing wings?

The F-14's Central Air Data Computer was a innovative design, using microprocessors for its implementation. This computer was used to control the swing wings of the F-14. How did the contemporary ...
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What modifications are necessary to the airframe and or instrument panel to add an autopilot to a light airplane (like a Cessna 172 or 182)?

If you were going to add an autopilot to a light airplane that never had one, what all needs to be done? I know they need to connect servos somewhere (where exactly), and add instrumentation to the ...
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Do safety-critical avionics systems run Linux?

I have heard diverse things about this. Some people claim that running Linux on safety-critical avionics systems is a very bad idea. On the other hand some people (who are rather unfamiliar with ...
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Will the new Part 23 changes reduce the cost of avionics for existing aircraft?

Will the part 23 changes coming in August help to reduce the cost of IFR GPS avionics? I'm looking to upgrade the IFR avionics in a 1978 Cessna 182.
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Why didn't the A330neo and A320neo share the cockpit of the A350?

Recently Airbus presented its lastest projects A330neo and A320neo. I'm sincerely surprised about the cockpit, in that it is essentially the same of the original A330, while I was expecting that ...
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How to leverage Lynx NGT-9000's integrated GPS/WAAS?

I’m inheriting an IFR capable 1964 Cherokee 235 that is not equipped with a GPS. I’m looking at installing a Lynx NGT-9000 to get ADS-B compliant and gain the traffic and weather information. Is ...
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Why does Boeing 737 use 2 Inertial Reference Systems (IRS) and GPS?

According to this website the Boeing 737 aircraft use 2 IRS and 2 GPS: IRS L & IRS R. Why? Apparently they are totally independent of each other. Could somebody explain a little bit why they need ...
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339 views

What is the correct name of this aircraft subsystem in English?

I would like to know what the correct name of this aircraft susbsystem is in English: (Source) name: пилотажно навигационный комплекс +/- literally translated it could be something like: flight ...
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What features are cursor controlled on the A380 Navigation Display?

I read that on the A380 and A350, certain features on the Navigation Display can be controlled via the Keyboard and Cursor Control Unit (KCCU). However, I did not find a full list of these features. I ...
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Are well-known IR AAMs 'compatible' with aircraft from other countries?

The AA-2 Atoll was a Russian reverse-engineered clone of the AIM-9B Sidewinder. There are some sources that indicate, with varying degrees of veracity, that it was a good enough clone that the two ...
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What is the most commonly occurring fault with this type of electrically driven gyro?

I have an examination tomorrow about advanced avionics systems (EASA module 13) and we are required to troubleshoot a fault with the compass system. What is the most commonly occurring fault with a ...
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Why do we have to manually tune VOR receivers?

As the VOR frequency is automatically selected when the DME is selected, under what system conditions is manual tuning of the VOR required? (aviation-safety-bureau.com)
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In case of failure in the Electronic Flight Instrument System, how would they be transferred between each other?

In EFIS, in case of failure in the PFD, where would be PFD shown? In case of failure in the ND, where it would be shown? In case the PFD & ND both fail, where would they be shown?
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Are there general accuracy requirements for aircraft power supplies?

Let's say I have some LRU device that requires some DC voltage to be powered on. Are there any general requirements in aviation/aerospace that say how accurate that supply voltage must be in order to ...
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Is there any reason to have ADS-B out that is not based on GPS?

The ADS-B system is only as accurate as the location data source it uses. In the US the 2020 ADS-B mandate requires that horizontal location data be from a GPS source with minimum performance ...
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Why does the Canadair Regional Jet still use CRT screens?

All the CRJ aircraft from the 100 up through the new 1000 use the antiquated CRT technology for the main primary and secondary displays as well as the ED1 and ED2 displays. Aren't flat screens a more ...
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Are all EGPWS-equipped aircraft using the same underlying system?

All modern transport-category aircraft and many other aircraft are equipped with enhanced ground proximity warning system (EGPWS). When this EGPWS acronym is used, is it always referring to the same ...
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How does the ADF null positions find where the NDB is?

I understand how it operates for the most part, although I don't understand how the null positioning works. This image below doesn't include the sense antenna that limits it to one null position, ...
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What causes the phase to change in a VOR?

I get the light house analogy, and how the VOR essentially works, although I'm wondering what actually causes this phase shift? As it hits magnetic north the variable and reference signal are in phase,...
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Why is my Garmin GFC 700 wandering a lot laterally on an ILS approach?

I've noticed that my Garmin GFC 700 autopilot is 'hunting' on ILS approaches. To be absolutely clear, I mean an approach using a localizer with glideslope. It is rock solid on RNAV, GPS, and other ...
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What is the benefit of upgrading Flight Management System to version UNS-1Ew? [closed]

I am working in a private airlines. We have some Dash-8 Q400 aircraft in our fleet. Recently a SB has been issued telling us to upgrade the Flight Management System from UNS-1E to UNS-1Ew. Can ...
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What would the “wings level” button most likely do if activated in the event of a flat spin?

If an aircraft equipped with a wings level button (such as the TBM 930) entered a flat spin, would pressing it accomplish anything productive? I am aware that the purpose of the button is to return ...
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What is the use of this remove before flight cover on the nose of a Bombardier Global 6000?

I recently saw a Bombardier Global 6000 at my local airport. I was just wondering what the use of this circled remove before flight cover on the nose of the Bombardier Global 6000 is. I never saw such ...
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Does avionics type matter when training for PPL?

Soon I want to start training for my PPL (VFR) and I'm currently looking at two flight schools in my area. At one of the two their whole training fleet is equipped with G1000 avionics, while the other ...
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What is this clock-like device?

Whenever I watch cockpit footage of test flights there is always an added device with big clock-like digits centered above the glareshield. They come in different shapes as shown below. What are they ...
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What type of computers are in a flight system?

I know there are many types of flight computer systems, with varying names and capabilities. I'm more interested in knowing what the computers, themselves, are made of? They certainly are not "off ...