Questions tagged [avionics]

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

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7
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2answers
221 views

Why would an artificial horizon's roll axis be different on ground and in flight?

Sorry, if I'm a bit verbose here, but since I don't understand the problem, I have difficulties to describe it. I created an artificial horizon using an Adafruit precision 9 DoF sensors and their AHRS ...
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0answers
155 views

Where can I find an image of the A380's avionics bay? [closed]

I've been looking for an image or model of an A380's avionics bay for a scene in a novel I'm writing. I'd like to showcase the advanced tech that the plane uses and have reference material if it gets ...
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1answer
66 views

How do I set up G1000 GFC700 autopilot for takeoff?

I want to be able to engage autopilot right away at a safe altitude, while taking advantage of flight level control at Vy for the climb. Heading is set for the runway. I’d switch to NAV mode when I ...
4
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2answers
617 views

What can cause my radio to transmit nothing but a terrible noise?

I have replaced the noise filter and checked the jacks. It does not matter what headset or jacks are used. I replaced the audio panel and had the radio serviced. When I transmit all I hear is a low ...
1
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2answers
209 views

Do the rules used in modern soaring competitions forbid gyroscopic flight instruments, or forbid the use of AHRS-driven attitude displays, etc?

In the past, the rules for soaring competitions in the US and many other countries have not permitted gliders (sailplanes) to have working gyroscopic instruments installed, to prevent pilots from ...
11
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1answer
2k views

How can the A320 receive 3 DME signals if it has only 2 DME receivers?

How can the A320 receive simultaneously 3 DME signals (VOR1 + VOR2 + ILS) if it has only 2 DME receivers (and antennas)? Does it multiplex them in some way? If yes, does it mean if one DME receiver ...
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0answers
47 views

Boundary layer thickness calculation

I have tried to calculate all the losses associated with the serpentine intake to calculate the total pressure recovery. I have considered the frictional losses, pressure loss due to bend, approach ...
1
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1answer
140 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 ...
7
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1answer
305 views

Question about congestion of the 1090MHz frequency

I'm no expert so there's likely to be a lot of mistakes in this post. ADS-B - Automatic Dependent Surveillance - Broadcast, (out) transmits (in) receives position data from/to other aircraft and to ...
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3answers
449 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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3answers
329 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 ...
6
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1answer
263 views

How does a plane's weather radar ignore returns from other weather radars?

In busy and congested airplane areas (around large airports, for example), there could be dozens of commercial aircraft, all with their own weather radar transmitters/receivers actively transmitting ...
4
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1answer
456 views

Will Lockheed Martin Flight Services send me ACAS, EasyActivate™, and other text messages if I file my flight plan through ForeFlight Mobile?

ForeFlight Mobile users who file flight plans without being authenticated to CSC DUATS will effectively file through Lockheed Martin Flight Services (LMFS). Considering that the LMFS route does not ...
3
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1answer
155 views

Can autopilot track ILS without any internal heading reference?

I am asking about the internal design of the autopilot of a CRJ200 (no autoland). I was flying an ILS approach when the AHRS heading started to drift rapidly by 30 degrees. The autopilot somehow was ...
17
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2answers
1k views

Why is the input power of an ADS-B Transponder much lower than its rated transmission output power?

ADS-B Transponders are usually rated with 150W or 250W transmission power, however the electrical input at 14V is rated much lower, usually around 6 Watt. How can that be? 150 W transmission power ...
10
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4answers
1k views

How do instructors simulate instrument failure in basic training aircraft with glass cockpits?

While working towards my private pilot's license in the United States in 2004-2005 (in a steam gauge only airplane), I very much remember my instructor covering one or more instruments to simulate ...
0
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1answer
49 views

Should I use given resolution or calculate resolution based on the max range and number of sig bits?

In ARINC429, Should I use given resolution or calculate resolution based on the max range and number of sig bits given? ForeExample, to calculate Ambient Static Pressure (Label-203, Equipment ID - 10A)...
3
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1answer
202 views

What is this instrument?

I am looking to sell this instrument, but it has no part numbers or any other identifying marks other than it says "Kollsman" on the back. Anyone know what it is and what it might be worth?
2
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1answer
377 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 ...
4
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1answer
356 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?
2
votes
1answer
137 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 ...
0
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2answers
2k 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 ...
0
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1answer
137 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
106 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?
0
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1answer
114 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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0answers
71 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&...
51
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3answers
22k views

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 ...
3
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2answers
175 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 ...
11
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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 ...
0
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1answer
94 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 ...
0
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1answer
156 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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0answers
50 views

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 ...
0
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1answer
80 views

Does the civil industry use the CAN FD bus?

Does anyone know if commercial aircraft are using the CAN FD communication bus?
1
vote
1answer
156 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 ...
10
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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) ...
9
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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 ...
19
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2answers
31k 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.
13
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2answers
8k 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 ...
0
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1answer
90 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?
10
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2answers
31k 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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0answers
67 views

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.
10
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4answers
4k views

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, ...
2
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1answer
374 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 ...
0
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2answers
115 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 ...
13
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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,...
17
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7answers
6k views

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 ...
5
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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 ...
9
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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, ...
2
votes
1answer
114 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) ...
2
votes
2answers
419 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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