Questions tagged [avionics]

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

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95 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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209 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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0answers
145 views

Would someone please describe or explain airship or zeppelin avionics packages [closed]

I'm hoping to learn more about this avionics pictue, with a plan to redesign the user interface. Would someone be willing to share other pictures, along with descriptions of each data point?
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1answer
300 views

HSI KG 525 PNI non slaved or only slaved?

I'm in Germany and currently on a project about the avionics of an older airplane (PA28). Here is a link to a former reddit question. My Prof. and me want to update the Avionics now - he asked me to ...
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3answers
279 views

What does “inertial” refer to in “inertial reference”?

An ADIRU makes use of air data reference and inertial reference. Inertial reference calculates the heading, position, ground speed and attitude. I was wondering why is it called inertial. Is it ...
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1answer
593 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?
2
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1answer
680 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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1answer
134 views

What are the standards on displaying Crew Awareness Messages?

Are there any standards on where in display Crew awareness system messages needs to be shown and how many messages at a time needs to be displayed. I checked SAE ARP4102-7 but I didn't find any ...
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2answers
186 views

How does a TACAN signal change with bearing from the station?

In the TACAN system , how does a change in bearing , would translate to a change in the time (or frequency) domain. I'll try to elaborate: I'm aware , of the TACAN operation in general. let's say ...
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1answer
197 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
312 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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1answer
181 views

Are there regulations for unmanned aerial systems avionics?

I know that there are documents such as DO-178B, DO-178C and DO-254 that provide guidance and requirements for the development of avionics in general. In my opinion it's hard to believe that avionics ...
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1answer
95 views

What is the required accuracy of an airspeed indicator?

What FAA document specifies the accuracy to which an airspeed indicator must be calibrated to?
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1answer
351 views

Why would the digits fade out and blink in darkness on a KX-155?

I have a radio installation with two KX-155 Nav-Comms. These radios are equipped with a photocell to automatically dim the displays to match cabin lighting. In dark lighting, the digits fade to the ...
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1answer
104 views

Garmin 530: What is NXRG telling me?

I have a Garmin 530 in a Cessna 550. It has a constant display of NXRG:x:xx in the upper right corner of a map page. It changes color (yellow and green are common) ...
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2answers
162 views

What does it mean to “lock on” to a DME ground station?

I was just reading about the working of the DME the other day and then I read a para which said: The aircraft interrogator "locks on" to the DME ground station once it recognizes a particular ...
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1answer
499 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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1answer
681 views

How do GLS avionics plot an entire accurate approach path?

I'm studying wireless navigation systems, especially GBAS. I have gone through some ICAO documents regarding GBAS. From what I have read, FAS data is included in Message Type 4. Closer examination of ...
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1answer
2k views

Do aircraft have radar or other forms of traffic sensing?

Quicky question. Do modern commercial aircraft include radar to detect traffic in their vicinity or perhaps have some mechanism to receive transponder signals. I know they have forward facing ...
2
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2answers
393 views

Does DO-178C require static code analysis for level A software?

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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1answer
349 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
331 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 ...
2
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1answer
580 views

What is required to 'upgrade' software from DAL C to DAL A?

What are the things to be noted or considered if a software which was initially treated as DAL C and later wanted to be considered as DAL A?
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1answer
358 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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1answer
271 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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2answers
235 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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1answer
657 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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1answer
1k views

How to encode an altitude in ARINC429?

How can I encode an altitude (ft) in ARINC429? I didn't understand if I just need to transform it in binary number and then use the "Bipolar Return-to-Zero". Like for example with an altitude of 25 ...
2
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1answer
65 views

Best Practices when removing/inspecting/mounting control surfaces?

I am looking for a better way to essentially "mount" the control surfaces from a Boeing 737-747-777-787 and MD-11's. The current process is to just remove them and strap to a table. The issues with ...
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2answers
203 views

What hardware standards should the flight control computer pass?

There are some standards for each part of the aircraft like actuators, sensors,... I could not find one for the flight control computer hardware. For example what are the environmental tests, or any ...
2
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1answer
110 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? ...
2
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1answer
384 views

Could simple fly-by-wire controls be installed in a prototype as quickly as a mechanical system with an autopilot?

It seems that fly-by-wire systems can take longer to get certified as the testing requirements are much more extensive. A prototype aircraft wouldn't have to pass these tests. How much more time or ...
2
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1answer
268 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 ...
2
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1answer
534 views

To which security domain does the Cabin Intercommunication Data System (CIDS) belong?

I've read a lot about Cabin Intercommunication Data System (CIDS) functionalities and features, but yet it is not really clear to me if CIDS is part of the Airline Information Services Domain (AISD), ...
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 ...
2
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1answer
311 views

How many VHF system can be in MEL for an A340?

How many VHF (Voice Communication) system can be in MEL for A340 aircraft? What are the guidelines to decide that and is it different for aircraft operating under FAR 121, 125 and 135?
2
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1answer
224 views

Would a 767-300 be considered FANS-1 capable without SATCOM?

It is known that aircraft flying in Europe above FL285 will be mandated to be capable of PM-CPDLC data link communication. Our 767-300 has ACARS CMU, Pegasus FMC, MCDU and VHF radios (three). The ...
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0answers
69 views

Which connector and cables are recommended for CAN?

Which mechanical connector(s) and cable(s) is/are recommended to arrange a Controller Area Network (CAN) bus communication or its aerospace counterpart ARINC 826 in the aerospace industry (civil & ...
2
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0answers
180 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. ...
2
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1answer
72 views

Currency retraining [closed]

I am a private pilot who has not flown in 30+ years, but want to start again. I'm a little concerned about how airspace and avionics may have changed. Will be starting with CFI next week. Can ...
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2answers
255 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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1answer
214 views

B767 antenna identification

Can anyone identify which comms/nav system the circled antenna belongs to? Thanks.
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3answers
355 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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1answer
249 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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2answers
562 views

What dictates the shape of the attitude indicator display on the PFD?

I notice the atitude indicator displayed in the PFD is either squared-shape or truncated-circle-shaped. A good example of the square shape is the B747-400, It looks like a square whose corner are a ...
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1answer
306 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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2answers
254 views

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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1answer
130 views

Why do ELT panel switches have batteries in them?

Does anybody know why ELT remotes (the panel mounted switches with LEDs) have batteries in them? The ELT itself has a big battery and there's a wire between them that the ELT could use to supply power ...
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1answer
464 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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2answers
827 views

Is the flight management system software independent from the hardware?

Is it possible to 'mix and match' hardware and software from different vendors to make a flight management system? I want to prepare a study about FMSes and I can see that there are several ...

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