Questions tagged [avionics]

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

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Static Analysis as per MISRA C 2012 using DO-178 [on hold]

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 of the ...
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Why does the SSM decoding vary between different A429 types

For A429 there are different types for example: BCD, BNR, Discrete ... These types have their corresponding SSM label that is unique, for example an SSM of "00" represents a failure for BNR but ...
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79 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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199 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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180 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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152 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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189 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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1answer
251 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
123 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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1answer
171 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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78 views

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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121 views

B767 antenna identification

Can anyone identify which comms/nav system the circled antenna belongs to? Thanks.
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102 views

What is the purpose of the selected altitude/airspeed in ARINC 429?

What is the purpose of the selected altitude and airspeed fields in ARINC 429?
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179 views

How much does an air data module cost?

Curious how much Air Data Module and Angle of attack sensor costs, such that is used on commercial airliners.
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115 views

How many labels are defined in ARINC 429 for calibrated altitude?

How many labels are defined in ARINC 429 for calibrated altitude?
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135 views

What technologies exist to find an aircraft position after it crashed out of line of sight? [closed]

What is the best way in the manner of products to find an aircraft after it crashed out of line of sight. Are there defined standards, and what are the selection criteria?
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60 views

What is the difference between ARINC 429 labels 025 and 102 for Selected Altitude?

What is the difference between ARINC 429 labels 025 and 102 for Selected Altitude?
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82 views

Aircraft with load sensors in their undercarriage to calculate CG [duplicate]

In another question on SE aviation I read that certain aircraft have load sensors in their undercarriage to calculate CG. Which are these types? The technology to build load sensors into the ...
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1answer
211 views

What navigation systems were used by the Space Shuttle during reentry?

What equipment did the Space Shuttle orbiters carry to support navigation during reentry? Were there any differences between the individual orbiters in this regard?
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1answer
175 views

How and why would one call the cockpit of an A330 inside its nose gear bay?

According to this A330 call panel diagram, there is an option to call the nose gear bay with the MECH button. Where is the connection for this in the nose gear bay, and what would it be used for? The ...
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352 views

What is the Space Shuttle's command law?

The Space Shuttle was fly-by-wire. In today's fly-by-wire systems, the command law commands either the load factor and the roll rate (e.g., A320's normal law), or the surface control deflection (e.g., ...
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287 views

Is it legal to install a TACAN receiver on a civilian aircraft?

It is legal to use the DME from a VORTAC station (see Is it possible for a civilian to use a VORTAC station? for details), but is it also legal to use the TACAN for bearing determination? This would ...
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103 views

Flight Mode in cellphones and in Flight WiFi access [closed]

More and more flights have in flight wifi. On the other hand, the standard pre flight announcement still tells to switch off phones or put them in flight mode. So, once the in flight wifi is turned ...
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1answer
81 views

How does a G1000 equipped with a GDC 74 calculate IAS from dynamic pressure?

How exactly does a G1000 system equipped with a GDC 74 air data computer calculate the indicated airspeed that is displayed on the PFD from difference between the total and static pressure (i.e. ...
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3answers
7k views

Why are on-board computers allowed to change controls without notifying the pilots?

Recently we've had the 737-MAX debacle, where it increasingly appears that the MAX on-board MCAS system repeatedly would issue nose-down events, leading to the Lion Air crash, and possibly another ...
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What kind of testing do new aircrafts go through in terms of avionics and software upgrades? [duplicate]

I am a UX designer, so my bread and butter is dealing with issues around software user research, information architecture and interaction design. I am very interested in avionics design but ...
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146 views

If the Meteor BVRAAM is the best AAM, and the APG-81 is the best radar for detecting aircraft, then why don't all fighter aircraft simply use these? [closed]

Why are some missiles incompatible with some aircraft? If fighter A has better radar and missiles than fighter B, then why isn't it possible to simply integrate the better radar and missiles into ...
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342 views

How is device control software checked for quality?

Many, many reports on the now infamous MCAS suggest a software patch is forthcoming in the next several weeks that will address the confounding single point of failure with the two AOA sensors that ...
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449 views

On a modern Aircraft like the A320 or B737, is it possible to disable computer interference with the control inputs of the pilots?

One more question due to the recent and unfortunate events in the case of the second ever B737 Max 8 crash. As far as I know, the first of the two crashes was caused by the MCAS System, that ...
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227 views

What does a white diagonal line mean on an Airbus ECAM DU?

When my A321 powers up, the lower ECAM DU shows only a diagonal white line. What does it mean and what would be the fix?
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993 views

Is there a type of instrument/display that guides pilots along a certain path?

What do you call an instrument that can help a pilot fly along a predetermined flight path (e.g. path thru GPS coordinates), showing them when they stray a little so they can correct? Not a control ...
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68 views

Hardware evaluation board for safety critical avionics software (especially Guidance and Autopilot)

Can anyone provide me examples of evaluation boards for prototype testing of guidance software including autopilot. I am looking for boards that are proven, stable and successful with support for any ...
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168 views

What principle does the attitude indicator in the G1000 use?

The heading indicator in the G1000 uses a magnetometor, but how can the attitude indicator work in the G1000? Does it work with a tilt sensor, rate sensor or accelerometer?
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293 views

Are there any safety or technical reason airlines do not display flight information to passengers in real-time?

A newer addition to commercial airliners is seatback screens, that allow the passengers to watch movies, TV, and so forth. On most airlines, there is also a map, that shows you the aircraft's flight ...
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165 views

What does the ATR 72's EWD display look like for normal procedures?

Anyone could show/explain how EWD procedure window looks like for Normal Procedures list (and some example procedure maybe)? There are photos on the net showing Emergency/Failures cases but haven't ...
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350 views

What sort of control mechanisms (i.e., PID controllers) do modern FBW aircraft use?

It's a well-established fact that aircraft like the Boeing 777, and all Airbus passenger aircraft that were designed after the A300, feature a digital fly-by-wire control system. Considering the ...
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2answers
489 views

Was any MiG-29 modernized to incorporate digital systems?

Did any air force using the MiG-29 ever modernize their aircraft so that they can fly on fully digital equipment such as the following? Digital HUD Digital fly-by-wire Digital navigation system ...
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1answer
118 views

Will the G1000 cut off transmission over 35 seconds?

I'm new on G1000 system, it says; If the push-to-talk (PTT) Key becomes stuck, the COM transmitter stops transmitting after 35 seconds of continuous operation. I'm wondering if we keep speaking ...
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775 views

What are the fonts used in MCDU screens?

All MCDUs (and other screens) I've seen share a very similar, if not identical, set of fonts - a monospaced, sans-serif, very clean and easily readable font, often in two vertical sizes at the same ...
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114 views

What causes this error on the Collins 60A ADF system?

We've got a BAE Jetstream 32 equipped with a dual Collins 60A ADF system, and the co-pilot's side control head is: displaying "FLAG 10" when we press the TEST button; We looked up the error code, ...
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197 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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1answer
901 views

How do you calculate the range of a VHF transmitter that is on-board an aircraft?

I'm trying to calculate the range of a VHF transmitter on an aircraft output power 50W, frequency 130MHz, and reciever sensitivity of -100dBm. The calculations I have made give me ridiculously high ...
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1k views

How do the VNAV and LNAV work on the 737NG?

So, I'm very confused. Im from a Cessna background, no FMC. So, based on my understanding, you could run the autopilot independent of the FMC right? With Speed mode, HDG SEL mode, and V/S mode, am I ...
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551 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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148 views

What is the “A/B AUTO EXT” button for in a Falcon 7X?

What is the "A/B AUTO EXT" button in the overhead panel of the Dassault Falcon 7X? I see it's in the Flight Control section but I don't know what is its purpose. (sorry for low quality image)
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222 views

What is the ambient temperature used in RTCA/DO 160?

I was going through RTCA/DO 160D for some work-related issue. I went through the whole document but nowhere does it define what the "ambient temperature" value is? In one place it defines +15 to +35 ...
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137 views

How to keep a Garmin GTX330 turned off when powering on avionics?

There seems to be an option in the GTX 330 settings that keeps to unit from powering on when receiveing power from the power system. I flew in two different airplanes and one immediately powered on ...
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304 views

How does a HUD track a runway?

I was looking at the FCOM of the 787, and I came across an interesting thing. There is an HUD takeoff selection on the SID selection page. It got me to wonder, how does the HUD track the runway from ...
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877 views

What is the standard power supply and voltage supply on modern airliners?

I'm looking at reducing the weight footprint of some of the computer systems on a commercial liner. A big consumer of weight seems to be in power supplies and conversion. Being a computer guy, I don't ...