Questions tagged [avionics]

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

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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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2answers
816 views

Why are Flight Directors turned on so early?

I have noticed that the requirement to turn on the Flight Directors in a commercial aircraft is in one of the very first checklists. Why does this have to be the case when the Flight Directors are ...
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1answer
5k views

What exactly is a BITE?

I read that with each LRU or Module in the IMA it is associated a BITE, Built-in-test Equipment. Can you describe more in detail what it is and which is its scope?
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805 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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1answer
839 views

What is the ILS glide slope deviation on a 4 degree VOR check error?

On a US IFR flight, it is required to do a VOR check every 30 days and the error tolerance is 4 degree except for airborne check. Suppose I have 4 degree error on my VOR check. When I fly an ILS and ...
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409 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 ...
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2answers
2k views

What avionics systems are interfaced with ACARS?

I am a librarian looking for sources of information to help answer the following questions for one of our researchers: 1. what avionics systems are interfaced with ACARS and 2. how is the interaction ...
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1k views

Would it be possible to build a “rocket” using a series of ducted fans?

I'm wondering if it would be possible to build ducted fan "rocket". My idea is to construct the duct from 18650 batteries, and to have a series of contra rotating fans along its length. I can 3d ...
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3answers
345 views

What's holding equipment manufacturers from going into multicore, RTOS-based equipment?

What's holding equipment manufacturers from going into multicore, RTOS- based equipment? Recently, Rockwell Collins certified its display systems based on RTOS: Lynx Software Technologies, LynxOS-...
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1answer
2k views

What are the differences between the different types of TCAS?

In discussions about TCAS I've overheard mentioning different levels such as "TCAS 1" or "TCAS 3." What are the different types of TCAS and how are they different?
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301 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
2k views

What is the difference between Body Pitch Rate and Inertial Pitch Rate?

ARINC 429 specifies two series of attitude rate labels for ADIRS/AHRS/IRS systems: Body 326 : Body Pitch Rate 327 : Body Roll Rate 330 : Body Yaw Rate Inertial 336 : Inertial Pitch Rate 337 : ...
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891 views

Are there aircraft exemptions for CPDLC in the NAT area?

Another question lists the aircraft that are exempt from the EASA CPDLC rule. Is there a similar exemption for aircraft operating in the North Atlantic?
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What do all the indicators on a HUD mean?

Every Jet Fighter these days seems to have a Head Up Display. What do all of these indicators mean? Some things are fairly obvious: there is a compass there is an artificial horizon Other ...
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6k views

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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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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207 views

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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251 views

What aircraft manufacturer uses an HSI with DME, VOR, and G/S in one Instrument?

Which aircraft manufacturer uses a horizontal situation indicator (HSI) with DME, Glide Slope, VOR, and ADF in one Instrument?
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What is the minimum price for a full Glass cockpit for the size of 6 passengers aircraft?

I am working on my final project at school and currently looking for the information about avionics system. We design a concept amphibious aircraft with the info as listed below: 2 pilots in the ...
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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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1answer
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Why do we have to manually tune VOR receivers?

As the VOR frequency is automatically selected when the DME is selected, under what system conditions is manual tuning of the VOR required? (aviation-safety-bureau.com)
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2answers
271 views

What Electronic Flight Display is this?

I just watched this video in which the avionics surprised me. It looks like a half Garmin G600, attached on his yoke. What is that and is it permanently attached to the yoke or is it portable? Could ...
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993 views

Aircraft data bus and computer system

What is a line replaceable unit (LRU) in an aircraft data bus system? What kind of components are defined as LRU in a data bus system?
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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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3k views

Does the Airbus A320 or Boeing 737 have better resolution screens in the cockpit?

I know this is kind of a specific question so if nobody knows it's fine. Does anybody know if the Airbus A320 or Boeing 737 has better resolution cockpit screens like PFD and ND? ( For the Airbus A320 ...
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What is the differences of ADS-B and geometric height?

Why does ADS-B and geometric height (calculated height) differ from each other? If the geometric heights are calculated at night where the temperature is lower, then the result should be different ...
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737 views

Where can I find the standards for airborne systems software design? Is there a central repository for this information?

In reading about software and equipment design for aircraft I'm finding a lot of references to various standards like "DO-178B, Software Considerations in Airborne Systems and Equipment Certification",...
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521 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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3answers
14k 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
753 views

Which GPU (Graphics Processing Unit) is used to generate the graphics for avionics?

I guess it isn't the GTX 1080Ti. But which GPU(s) has the Boeing 737-NG for example? How does it differ from a GTX 1080Ti (cost: around €800), or Quadro P6000 (cost: around €7100)? How many GPU's are ...
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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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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
411 views

Which avionics suite does the 757 use?

I am wondering who makes the 757 avionics? Is there a glass cockpit upgrade? What is the name of the avionics suite? Thanks in advance
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257 views

What is the behaviour of ILS when there is an unmodulated interfering carrier signal?

Let us assume we have a localizer (identifier I-STK) transmitting at 110.10MHz and a matching glideslope at 334.40MHz. If a device aboard an aircraft tracking the I-STK ILS were to emit an ...
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2answers
549 views

What does the Emergency Avionics switch do?

In almost every light aircraft I've ever flown, I recall their being a rocker switch marked "Emergency Avionics". Here's an example: It's never really occurred to me to ask an instructor/owner what ...
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3answers
2k views

Are steam gauges more reliable than glass panels?

I have always had a deep appreciation for technology and the future and I encourage that technology should move us forward whether that be in aviation terms or otherwise but one question has been on ...
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1answer
880 views

Is a non-WAAS Garmin 530 certified for an LNAV/VNAV approach?

I may not understand all the details of what I'm asking but trying to wrap my head around it. I am aware that before WAAS, some GPS aircraft were equipped to get vertical guidance by a Barocorrected ...
3
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1answer
444 views

How can avionics detect tailwind? [duplicate]

We can see the effect of the tailwind on the plane's flight direction on the modern military fighter jet huds. I wonder about how can the avionic systems detect tailwind and which sensors using in the ...
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1answer
203 views

Why is the FOV of the Synthetic Vision of the Prodigy Flight Deck asymmetric?

Why is the FOV of the Synthetic Vision of the Prodigy Flight Deck asymmetric? I am just reading through the manual of the Prodigy® Flight Deck 100 and came to the chapter about the synthetic vision. ...
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2answers
626 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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2answers
1k views

Why is the King Air avionics switching system wired normally closed?

In the King Air 200 and B200 (perhaps other King Air models as well), the avionics electrical bus relays are normally closed. With the Avionics Master switch in the "OFF" position—which is ...
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1answer
2k 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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1answer
1k views

Which radio altimeter is the Boeing 737NG call outs based on?

I'm wondering which of the two Radio Altimeters: Captain (left) or F/O (right), that the 737 does the RA callouts based on. For instance, if the F/O's RA is slightly off, and passes 500ft before the ...
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1answer
202 views

How frequently are avionics on large commercial aircraft updated?

How frequently are avionics on large commercial aircraft updated? And how are the systems updated?
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162 views

What modifications are necessary to the airframe and or instrument panel to add an autopilot to a light airplane (like a Cessna 172 or 182)?

If you were going to add an autopilot to a light airplane that never had one, what all needs to be done? I know they need to connect servos somewhere (where exactly), and add instrumentation to the ...
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1answer
148 views

What is the format specification for Avidyne R9 flight data?

The Avidyne R9 records flight data five times per second and can export it for later analysis. I'm interested in parsing this data and exporting it to Google Earth / X-Plane for visualization. ...
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1answer
478 views

How is the drift corrected in INS-driven attitude/heading indicators?

(wikimedia.org) EFIS instruments during a test flight. How is the drift (accumulated error) nullified in INS-driven attitude/heading indicators? The related post 'How are attitude indicators kept ...
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171 views

Is there an ARINC label/data that can be associated with a gyroscope's precession?

I am looking to read the precession of a gyroscope off of an ARINC bus, is there an ARINC label that can be associated with the gyroscope's precession value? My thoughts are, that it might have ...
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1answer
2k views

Is there a such thing as an ARINC label for the yaw angle?

Is there a way to check the yaw angle on the ARINC bus? If so, what is the associated ARINC-429 label?
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Is it possible to display WAAS enabled GPS Flightlines on older mechanical flight directors such as S-tec?

We are in the research process of a panel upgrade in a M5 Maule. The ac is used for transportation and aerial survey to support ground survey. We frequently fly tight, low alt grids. Lateral and ...

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