Questions tagged [avionics]

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

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4
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1answer
6k views

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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5answers
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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 ...
5
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1answer
231 views

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 ...
4
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1answer
15k views

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 ...
4
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2answers
831 views

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 ...
6
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1answer
581 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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2answers
2k views

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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2answers
3k views

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 ...
14
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1answer
968 views

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 ...
3
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1answer
162 views

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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2answers
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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 ...
4
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1answer
896 views

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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2answers
2k views

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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1answer
361 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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2answers
2k views

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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1answer
270 views

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 ...
4
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1answer
419 views

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 ...
3
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1answer
1k views

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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1answer
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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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2answers
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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 ...
5
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1answer
504 views

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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2answers
1k views

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 ...
5
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1answer
303 views

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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1answer
8k views

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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1answer
3k views

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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0answers
290 views

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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1answer
737 views

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 ...
7
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1answer
291 views

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 ...
2
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1answer
681 views

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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3answers
593 views

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 ...
7
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1answer
546 views

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 ...
6
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1answer
2k views

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 ...
2
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0answers
181 views

DME replacement [closed]

I need help with this question: I have an ancient DME in my airplane, a "KN 60C" and it turns on and the dial bounces and sits at 25 miles, so my guess it's time to swap it with a digital one. ...
3
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2answers
637 views

Why does a dual-axis autopilot not allow operation in single-axis?

Image source: KFC 225 Pilot's Guide (PDF) In a dual-axis AP, when no lateral mode is selected, a wing leveler (ROL) mode is activated and can't be disengaged unless another lateral mode is selected. ...
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4answers
2k views

How do modern avionics work without vacuum pumps or gyroscopes?

I'm going to be taking my checkride soon on a Skycatcher 162. It has an all glass cockpit utilizing the Garmin G300, and its my understanding that it does not utilize gyroscopes or vacuum pumps for ...
2
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1answer
196 views

Do new VHF radios need to be flight tested?

I'm in the process of upgrading all our VHF radios and the local regulator has asked us to follow the guidance/recommendations from ICAO, as we have more or less cancelled many of our local rules. The ...
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3answers
5k views

Do planes have odometers?

I'm curious to know if planes have distance counters similar to the ones in cars indicating how many kilometres/miles the plane has flown since being put in service.
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1answer
2k views

What is this display on the 737 Classic?

Source: YouTube I noticed that display (yellow circle) between the two CDUs. What is it for? It is not a default installation on the 737-3/4/500. It looks like a Navigation Display/MFD, but why have ...
3
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1answer
172 views

Is there an ARINC label/data that can be associated with a gyroscope's precession?

I am looking to read the precession of a gyroscope off of an ARINC bus, is there an ARINC label that can be associated with the gyroscope's precession value? My thoughts are, that it might have ...
3
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1answer
2k views

Is there a such thing as an ARINC label for the yaw angle?

Is there a way to check the yaw angle on the ARINC bus? If so, what is the associated ARINC-429 label?
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2answers
1k views

Why is the King Air avionics switching system wired normally closed?

In the King Air 200 and B200 (perhaps other King Air models as well), the avionics electrical bus relays are normally closed. With the Avionics Master switch in the "OFF" position—which is ...
4
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1answer
844 views

What is the ILS glide slope deviation on a 4 degree VOR check error?

On a US IFR flight, it is required to do a VOR check every 30 days and the error tolerance is 4 degree except for airborne check. Suppose I have 4 degree error on my VOR check. When I fly an ILS and ...
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4answers
3k views

What are the options for installing ADS-B OUT in a Cessna Citation to meet the regulations?

So I have a friend that works for a company that owns a Cessna Citation. His company is looking to comply with the ADS-B regulations. He has been given the task of making a business case for actually ...
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2answers
2k views

Are there any accident reports that mention hacked/compromised avionics as a factor?

Does anyone know of any documented examples of airline accidents caused by hacked or otherwise deliberately compromised avionics?
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2answers
8k views

What is the encoding difference between ARINC 429 BNR and BCD formats?

I think I have an understanding of the differences between the types of ARINC word formats, but would just like to get some input to see if my understanding is correct. In the ARINC 429 specification, ...
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2answers
312 views

What measures can the aerospace industry take to deal with changes in the electronic industry that are incompatible with its own conservatism? [closed]

The development of computer flight systems is characterised by lengthy certification processes, exceptionally rigorous testing regimes and a default position of extreme caution. A change in any ...
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2answers
5k views

Which CPUs and programming languages are used in new airliner flight control systems?

Are the new systems of today built with the same CPUs and programming languages and development software as those of 20 or more years ago? By new I mean that these systems are currently being ...

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