Questions tagged [avionics]

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

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1answer
173 views

What controllers are used in Airbus/Boeing fly-by-wire systems?

I was wondering, what controllers are used in airbus or Boeing aircraft fly-by-wire systems to control servos? Who manufactures such controllers, or are the systems controlled from flight computer ...
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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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If you were to fly an ILS in a knife edge would you receve GS and LOC be flipped?

because LOC and GS work the same way, if you were to fly one at 90 degrees bank would your information be displayed on the wrong indicators?
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What do the dashed extended green lines on this PFD mean?

The most important source of information for the pilot is the PFD
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Why is an auditory alarm necessary when the autopilot disengages?

The FAA gives one requirement for the autopilot in the following FAR... FAR §25.1329 Flight guidance system. (j) Following disengagement of the autopilot, a warning (visual and auditory) ...
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248 views

Can an airline order a 777 with 787 flight deck avionics?

So an airline orders a 777, but instead of the cockpit in that, they request the 787 cockpit installed in their 777, is this even doable?
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Airbus control architecture - where does the actual autopilot live?

I'd like to ask for confirmation about the A320 (and, generally, Airbus family) control architecture. The book Aircraft Systems provides the following overview of A3XX computing architectures: ...
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0answers
57 views

Where is pure outside static air pressure indication on A320?

I'm looking for the indication of the outside static air pressure in the cockpit. Where is it located? One of the ECAM pages? Thanks!
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102 views

Where to find general A320 E&E Compartment Information?

I'm student in electrical engineering and write my thesis on some topic of the e&e compartment. The main focus is on the computers of the A320 flightcraft, actually called E&E Compartment. ...
4
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1answer
213 views

Is MIL-STD-1553 still used in modern aircraft?

I am working on an assignment for my "Avionics Systems Design" class and I want to use MIL-STD-1553 for my aircraft system. But according to some shady blogs this STD has been deprecated or superseded ...
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1answer
165 views

What is the difference between ACARS and ADS-B?

What is the difference between ACARS and ADS-B? For weather information in-flight or pre-flight which one is used?
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1answer
204 views

What does Phase 3A mean for avionics?

I've learned about Phase 1, Phase 2, and Phase 3 electrical systems. But recently I've faced an issue about replacement of Phase 3 Common Display System (CDS) Display Units (DUs) with new Phase 3A CDS ...
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How does Garmin Autoland for General Aviation aircraft work?

Garmin recently unveiled a new technology for their G3000 General Aviation avionics system, the Garmin Autoland. They claim it can safely and fully autonomously land the aircraft in case of pilot ...
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158 views

What triggers the trim horn and the “stabilizer motion” aural callout on the MD80?

I got conflicting or incomplete responses from various sources: There is an internal rate monitor looking to see the stabilizer is actually moving .08°/sec or -08°/sec. https://forums.tfdidesign....
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203 views

What physical hardware does all the avionics on the B737NG run on? Some processor from the 1980s? Or some new and improved chip?

So, I am a tech guy and likes to fly (in sims) so, I was wondering what physical hardware powers all the 737NG's avionics and related systems (PFD, MFD, EICAS, GPWS etc). Is there an answer to this?
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1answer
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Does SDAC display data for both the PFD, ND and the ECAM display?

On the Airbus A320 the System Data Acquisition Concentrators (SDAC) aquire system data, process it and sends system page data to the three Display Management Computers (DMC). The DMC process the data ...
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3answers
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How does the modulation of the transponder work?

The transponder works in PCM (pulse code modulation): how does it work in the transponder? I can find explanation of what PCM is, but not if the signal sent from the transponder antenna is digital or ...
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5k views

How is varying modulation depth achieved by localizer ground transmitters?

An approaching aircraft's navigation receiver uses the difference in depth of modulation between the 90Hz and 150Hz signals which are amplitude modulated onto an RF carrier (on a channel between ...
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1answer
81 views

How do rate gyros and other sensors send information to the flight control computer in an F-16?

How do rate gyros and other sensors send information to the flight control computer in an F-16? I mean is it a hardwired communication or it is done through a bus? If by bus, what is the bus called? ...
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57 views

Why does the SSM decoding vary between different A429 label types

For A429 there are different label types, for example: BCD, BNR, Discrete... These types have their corresponding SSM (Sign/Status Matrix) that is unique, for example an SSM of "00" represents a ...
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173 views

Why did this old Japan Nakajima J1N airplane use a Yagi rather than a parabolic antenna?

Picture source. As per my understanding, a Yagi antenna is a directional antenna with limited gain, which it broadcasts or receives the microwave signal to and from the front side. It can only ...
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2answers
7k views

What exactly did this mechanic sabotage on the American Airlines 737, and how dangerous was it?

An American Airlines mechanic sabotaged a 737 in Miami An American Airlines mechanic accused of sabotaging a navigation system on a flight with 150 people aboard at Miami International Airport was ...
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2answers
535 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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1answer
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What connector standard is used for aviation headsets?

The typical aviation headset features two cords with connectors that at first glance are identical. One is a standard 1/4" (0.25 inch) stereo audio jack. What kind of connector is the slightly ...
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1answer
328 views

How does the F-16 side stick convert pilot input to an electrical signal?

In What is the motivation behind designing a control stick that does not move? the F-16's control stick is discussed. What is the method that is used to sense the pilot's input to the stick and ...
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How dissimilar are redundant flight control computers?

Facts On Airbus aircraft there are computers to secure the flight envelope, or to move the control surfaces. FADECs totally control the engines. Computers take decisions in place of the pilots, or ...
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Why don't all commercial aircraft transmit GPS data in real time?

It seems strange that trucks and taxis can be set up to transmit GPS data in real time but aircraft cannot. Wouldn't this be a useful function and feasible to implement?
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What does “synoptic” mean in avionics?

I came across a mention of a display of "graphical aircraft system synoptics" on this page. I think in context that it means "status display" or "summary page"- the page that shows flap position, ...
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1answer
270 views

Is it possible to load (and not activate) the approach procedure on a Garmin 1000 or 430?

I noticed sometimes when I fly with a G1000, or Garmin 430 and am doing multiple practice approaches I can't always load my next approach. It forces allows me to activate the approach, which would ...
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3answers
4k views

What kind of delay does the A320's fly-by-wire system add?

More precisely, I am wondering if there is any kind of data on how long it takes between moving the sidestick and observing a reaction on the ailerons or elevator. I know that the physical control ...
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2answers
141 views

What sort of sensors are used for sensing the positions of the control surfaces for the ECAM F/CTL page on Airbus aircraft?

During the pre-flight flight-controls-check how does the ECAM F/CTL page report on the actual positions of the control surfaces? What sort of sensors are these? Is it a proximity sensor? This is ...
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1answer
157 views

Static Analysis as per MISRA C 2012 using DO-178

Does DO-178C have any guidelines on using static code analysis for level A software? As per Do-178C: Section 6.3 Software Reviews and Analyses Reviews and analyses are applied to the outputs ...
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222 views

Is “hacking small planes” a separate or larger problem from/than general small-aircraft security?

Apparently the DHS has issued a "hacking alert" for small aircraft: The alert warns if a hacker gained physical access to certain small planes, they could attach a common device to its wiring. This ...
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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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3answers
10k views

What are the differences between FADEC and EEC systems?

Can anyone differentiate FADEC and EEC system in an aircraft Engines? As I was working related to Engine controlling. I got confused of FADEC and EECs. As per some of the doc. I read like EECs are a ...
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1answer
97 views

Do the DO-178 standards include guidelines on cyclomatic complexity?

Is there any guideline related to the cyclomatic complexity of software that complies with the DO-178C or DO-178B standards?
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1answer
338 views

How does F/A-18 autotrack work?

This is about the alleged "UFO" video. However, I'm not interested in speculation about what exactly the aircraft being tracked in the video is. What is "autotrack" in an F/A-18 Super Hornet? Does it ...
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1answer
224 views

What is that Boeing 757 custom cockpit interface?

Cropped; flickr.com, 2008 The photo is taken in cruise. The selected display shows takeoff data. There is also a send button (which hints at a datalink capability for communicating values). I ...
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1answer
240 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 ...
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1answer
235 views

Can Python be used onboard systems on aircraft or military jets? [closed]

Was working on a python related to avionics, came across a serious doubt whether code written in python would compile or run on a real time OS used in on board systems.
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1answer
190 views

How are electronic instruments and other equipment powered in a glider?

Radios and other electronic devices must be battery-powered. What sort of battery - and does its capacity impose a limit on flight duration, or can they be recharged in flight with a turbine?
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1answer
308 views

Sukhoi Superjet 100 avionics

The Sukhoi Superjet 100 features flight control system with characteristics copied from Airbus. Side-sticks, same control laws. But does it actually use any of the hardware or software from Airbus (...
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Like transponders, can flight recorders be turned off?

I never knew much about airplanes before the tragic incident of Malaysia 370. I have been spending a lot of time on Twitter reading various articles and investigations; in one of the articles I read, ...
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2answers
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How is a fly-by-wire system realized in big planes?

For example if whole system is build on CAN protocol that give maximum rate of 9000 messages per second with IMHO is quite low number for big plane. Can you give me any example how this problem was ...
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1answer
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Second career as an avionics technician

I will soon be retiring from my first career as an electrician on large construction projects. Planning on becoming an active private pilot again and I am basically an aviation nut. I am curious as ...
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1answer
146 views

How do navigation displays depict turn anticipation?

I'm working on a navigation display for a simulation and I want to know if someone can explain me how the navigation display displays the "curved lines" for fly-by waypoints.I know how to calculate ...
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4answers
716 views

Is the 737's autopilot part of the FMS or is it a separate entity?

I was watching a tutorial about the FMS and the autopilot in the 737, and I am consfused. I come from a Cessna background, where there is no FMS, there is only the AP (autopilot). So, is the AP a ...
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227 views

How is the center ILS used on the 747-400?

The aircraft has 3 ILS receivers, but only ILS L and R in the CDUs. How does the ILS C is put into action?
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1k views

What do the gyroscopes used in commercial aircraft actually look like?

I pretty much grew up watching Air Crash Investigation and Seconds From Disaster and every other episode had a mention of the aircraft’s gyroscopes, but I always wondered how did FAA rated industrial ...
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7k views

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 ...