Questions tagged [avionics]

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

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1answer
327 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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1answer
133 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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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
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
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
89 views

Is it possible to export NMEA data from a Garmin GDL-39 to a custom Android App?

Hi I was wondering if it's possible to receive NMEA data from a Garmin GDL 39 on an Android device (preferred over Bluetooth) as I can't find any information out there on it.
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64 views

How would I confirm the DC polarity of a 1960's Turn and Slip Indicator?

I have a 1960's gyroscopic turn indicator which I would like to power up. It has, what I presume to be, some kind of standard connector and the plate confirms 28 Volts DC. The pins are labeled "A&...
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3answers
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Why is Python used on aircraft although it may not be certifiable?

I recently had a discussion with people who were active in the aviation industry and told me that one of the main languages/tools they use is Python. On the other hand I have always known that people ...
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2answers
136 views

Does ARINC 429 have any error correction methods?

I'm currently studying the application of ARINC 429, and have noticed that ARINC 429 doesn't have an error correction but an Error detection set in the parity bit (bit-32). Are there any means for ...
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4answers
2k views

Can a software “hard freeze” or serious hardware problem completely disable the whole cockpit?

I think that the glass cockpit of a modern plane has some sort of a central power supply or at least some central controlling software. What happens if this central power suddenly disappears, or the ...
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1answer
84 views

What are the ASTERIX CAT010 message types 005 and higher?

I am analyzing some surface radar recording data under Asterix CAT010 category. The document from Eurocontrol shows that there are 4 standardized message formats under this category: 001 Target ...
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1answer
151 views

Which language is used to develop new aircrafts' avionic systems AI? [duplicate]

As an airframe and powerplant maintenance student, I also want to get an avionics license. My main goal is working on artificial intelligence of aircrafts avionics. However I'm concerned about the ...
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Does the Flight Acquisition Unit on the Boeing 737 NG stream data?

I noticed on B737-800 entering the flight deck on the right side there is a port Data Loader and I think this is the Flight Acquisition Unit. Is this port used exclusively for loading data to FMCs etc ...
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74 views

Does the civil industry use the CAN FD bus?

Does anyone know if commercial aircraft are using the CAN FD communication bus?
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1answer
143 views

How does the G1000 differ from an airliner’s avionics?

I'm going through my multi-engine rating, and my flight training has always been on the G1000. I've had a simple system course on the CRJ-200. In terms of IFR flying, I really don't see much ...
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1answer
3k views

How are electronic systems locked and connected in the electronic bay?

On aircraft the electronics bay contains multiple systems, e.g. for the A320: A320, photo by B-2230, source: JetPhotos How is the electronic equipment locked (it seems there are two mobile screws) ...
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2answers
3k 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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2answers
30k views

How does TACAN work?

How does the Tactical Air Navigation (TACAN) system work? How is it different from the VHF Omnidirectional Range (VOR) system? Please explain in the simplest possible way.
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2answers
7k 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
77 views

What is the difference between a navigation database and an airport mapping database?

What is the difference between "navigation database" and "airport mapping database"? Are those both required by flight management software for flight planning?
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2answers
30k views

What is the difference between Line-Replaceable Unit (LRU) and Integrated Modular Avionics (IMA)?

I'm studying the Integrated Modular Avionics (IMA) and the Line-Replaceable Unit (LRU), but I don't get the difference.
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What is the difference between Line-Replaceable Unit (LRU) and Line Replaceable Modules (LRM)? [duplicate]

i am studying Line-Replaceable Unit (LRU) and Line Replaceable Modules (LRM) but do not know the difference.
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4answers
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What CPU does the F-16 use?

I've read that the "F-16", without it being specified what version, uses the 1750A CPU, it is on the list here, although without a citation: https://en.wikipedia.org/wiki/MIL-STD-1750A However, ...
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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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2answers
111 views

Why is the ILS16 approach at KSKF not available in my Garmin 430W?

I am doing flight instruction on the San Antonio area (Texas) and I've been shooting different approches on the vecinity airports. One of the approaches I usually execute is the ILS 16 at KSKF, which ...
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1answer
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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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7answers
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Is it possible to accurately measure airspeed without pitot tube?

This is a follow-up to my previous question: How does this IMU work and how to convert its output into meaningful information? for which many people asserted that I need a pitot tube and a static ...
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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
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
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
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
121 views

Are modern airliner avionics spill-proof? [duplicate]

I thought about this today, and didn't find much other than a flight decades ago that made an emergency landing due to spillage causing the trim wheel to uncontrollably pitch the plane down into a ...
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0answers
106 views

How many LRUs are there in modern aircraft like a Boeing 747 or an Airbus A380?

I work in the Avionics industry. I always wonder, how many Line-Replaceable Units (LRUs) are present in modern aircraft like A380 and Boeing 747. I understand that number of LRUs varies from customer ...
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4answers
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What is 'level' to a G1000?

I used to fly a Cessna 550 with 'steam gage' mechanical gyros. The Attitude Indicator always had its flight director solidly on the horizon in level flight -- to the extent a mechanical instrument ...
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3answers
588 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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5answers
6k views

4 Boeing 707 for $50,000. Is that possible?

I'm helping a friend with an article on some issues in my country, mostly related to corruption. His English isn't very good, so here I go One of the cases he's analyzing is the sale of 4 Boeing-707 ...
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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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2answers
185 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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0answers
89 views

What is this part called in a vertical card compass?

I recently found a Precision Aviation PAI-700 vertical card compass in my shed, but it’s sadly broken! I don’t want to use it in a plane but would like to fix it so it can at least work. It would be a ...
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3answers
3k views

Could the CVR and FDR record to the cloud?

Another enthusiast question. I watch a lot of the National Geographic Channel's "Air Crash Investigation", for better or worse, and it seems accident investigators make tremendous use of the Cockpit ...
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1answer
407 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 ...
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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 & ...
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1answer
165 views

Does ARINC 825 (Aviation CAN bus) follow the same protocol as automotive CAN buses?

From what I can gather it is derived from the automotive industry standard CAN (Controller Area Network) bus, but I was wondering if they share the same protocols. If you took an automotive bus reader ...
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2answers
125 views

Is AMDAR a required system on aircraft?

I was intrigued by the assertion that COVID-19 depressing commercial aviation has lead to lower quality weather forecasting The aircraft observations are a key piece in the jigsaw of national and ...
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1answer
150 views

Does the nearest function on a G1000 allow for listing of anything other than nearest airports?

In non G1000 GPS systems, I have seen several pages for selecting the nearest airport, VOR, NDB, intersections, and waypoint, but in a G1000, I can only seem to get a listing of the nearest airport, ...
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1answer
259 views

Is there a brightness switch for the AOA gauge on the F-16?

Is there a brightness switch for the AOA gauge on the F-16? Please share a picture with the panel if you can.
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3answers
3k views

What happens with the avionics if in midair there is loss of power or fuel flow interrupted? [duplicate]

What happens if in midair there is loss of power, how will the avionics perform in such a situation (cockpit display, flight plan)?
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1k views

Why don't aircraft have DME that can automatically convert the slant range to ground range?

Knowing that $a^2 = b^2 + c^2$ where $a = \text{slant range},\ b= \text{ground range},\ c = \text{height}$. Why can't the DME equipment which calculates the slant range then just convert it to the ...
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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 ...
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4answers
606 views

Do any aircraft have a “self-contained ILS”?

The ILS is an invaluable aid to pilots, especially those operating to/from the many airports where poor weather is common (low-visibility operations would be completely impossible without an ILS); ...

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