Questions tagged [avionics]

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

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6
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4answers
1k views

How do modern avionics work without vacuum pumps or gyroscopes?

I'm going to be taking my checkride soon on a Skycatcher 162. It has an all glass cockpit utilizing the Garmin G300, and its my understanding that it does not utilize gyroscopes or vacuum pumps for ...
2
votes
1answer
189 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 ...
20
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3answers
4k views

Do planes have odometers?

I'm curious to know if planes have distance counters similar to the ones in cars indicating how many kilometres/miles the plane has flown since being put in service.
8
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1answer
1k views

What is this display on the 737 Classic?

Source: YouTube I noticed that display (yellow circle) between the two CDUs. What is it for? It is not a default installation on the 737-3/4/500. It looks like a Navigation Display/MFD, but why have ...
3
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1answer
160 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 ...
3
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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?
2
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2answers
833 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 ...
4
votes
1answer
739 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 ...
6
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4answers
3k views

What are the options for installing ADS-B OUT in a Cessna Citation to meet the regulations?

So I have a friend that works for a company that owns a Cessna Citation. His company is looking to comply with the ADS-B regulations. He has been given the task of making a business case for actually ...
12
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2answers
2k views

Are there any accident reports that mention hacked/compromised avionics as a factor?

Does anyone know of any documented examples of airline accidents caused by hacked or otherwise deliberately compromised avionics?
5
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2answers
7k views

What is the encoding difference between ARINC 429 BNR and BCD formats?

I think I have an understanding of the differences between the types of ARINC word formats, but would just like to get some input to see if my understanding is correct. In the ARINC 429 specification, ...
8
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2answers
308 views

What measures can the aerospace industry take to deal with changes in the electronic industry that are incompatible with its own conservatism? [closed]

The development of computer flight systems is characterised by lengthy certification processes, exceptionally rigorous testing regimes and a default position of extreme caution. A change in any ...
15
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2answers
4k views

Which CPUs and programming languages are used in new airliner flight control systems?

Are the new systems of today built with the same CPUs and programming languages and development software as those of 20 or more years ago? By new I mean that these systems are currently being ...
18
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2answers
25k 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.
10
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1answer
328 views

Do aviation intercoms have a standardized compatibility with radio stacks?

I have been seeking an intercom unit for a Cessna 172N that has four seats but only two headset jacks, and I would like my rear passengers to be able to communicate without yelling. Aviation ...
2
votes
1answer
69 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 ...
8
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1answer
771 views

Is a VHF NAV receiver inherently capable of processing a LOC signal?

These last few weeks I have been flying a couple of different aircraft that had inoperative glideslope capabilities, but I was able to fly LOC approaches without trouble. In my career as a pilot and ...
4
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2answers
1k views

How is a fly-by-wire system realized in big planes?

For example if whole system is build on CAN protocol that give maximum rate of 9000 messages per second with IMHO is quite low number for big plane. Can you give me any example how this problem was ...
8
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1answer
1k views

Why does this GPS approach say “RADAR REQUIRED”?

As I was looking at the approach charts for KCXY while answering this question, I realized that the GPS "overlay-style" approach to RW8 also requires RADAR. Since the HAR VOR isn't even shown on ...
9
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1answer
445 views

What is an Enhanced Vision System?

I was reading something at work that said the company has installed an Enhanced Vision System on the aircraft. FedEx Express added Enhanced Vision Systems to 250 aircraft, which will greatly ...
5
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1answer
361 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 ...
12
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1answer
3k views

What are the “channels” on the A320 Rudder Travel Limit Unit?

The KNKT's final report on last year's Air Indonesia QZ-8501 crash repeatedly mentions that the faulty solder joint on the Flight Augmentation Computer (FAC) caused an open circuit on "both channel A ...
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2answers
451 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 ...
4
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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 ...
13
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2answers
14k views

What is the difference between CAN and ARINC?

I want to know the difference between CAN and ARINC, I'm confused about their usage. For example, the communication between the cockpit and the controllers is done using ARINC protocols. And the data ...
4
votes
3answers
332 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-...
4
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3answers
2k views

Which aircraft manufacturers still include Vertical Situation Displays (VSD) feature in their cockpits?

I'm curious about the aircraft manufacturer names who still interested in including the VSD on lower part of Nav Display (I read about Boeing 737 only). Are there any other guys on this filed still? I ...
32
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2answers
5k views

What are these boxes built into the tails of some fighters?

In looking at European-designed fighters of the 4th and 4.5th generation, I keep seeing a common design feature; a box-like structure built into the tail, often in the top half or third. Some examples:...
4
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1answer
1k 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?
16
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1answer
2k views

Why is it hard to see G1000 with sunglasses?

I got checked out in the G1000 172 at my flight school just so I could schedule to fly when the two steam gauge 172s were booked. I'm very impressed by the G1000, but I can't wear sunglasses when I ...
5
votes
2answers
598 views

Should an IFR-certified radio's automated nav aid identification feature be considered positive identification?

Should an IFR-certified radio's automated nav aid identification feature be considered positive identification? Should manual identification still be performed? Does anyone know if this is addressed ...
13
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3answers
1k views

How are avionics updates delivered?

I'm idly curious to know what type of physical storage medium (e.g. is it a "mini-CD", USB key, a little hard drive, maybe a tape) is used for delivering avionics updates, for an as-recent-as-possible ...
6
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1answer
5k views

What is the function of a skew sensor in an aircraft?

I was trying to understand Slat and Flap control Unit and came across the term "skew sensor". Can anyone explain it to me?
7
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2answers
843 views

What is the tablet/application being used in this 737?

In this video (marker 2:32), you can see that the captain has a tablet mounted to his left with some sort of application open in it. It looks like an iPad (though I could be wrong), but what I'm ...
5
votes
1answer
363 views

How are the system development and integration procedure separated for Integrated Modular Avionics?

I'm reading this paper about IMA (Integrated Modular Avionics) and I don't get the splitting of the development and integration procedure. In page 4 it says: Airbus has to modify the conventional ...
9
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2answers
25k 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.
3
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0answers
137 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?
5
votes
3answers
585 views

Who checks the instruments and avionics before the crew boards an aircraft?

Before the crew boards the aircraft for a commercial airline flight, is there anyone who checks the instruments and avionics system? I'm sure the engines are checked but what about the avionics ...
3
votes
3answers
2k views

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 ...
34
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1answer
7k views

How does WiFi work on an aircraft?

I've noticed that when a WiFi system is set up on an aircraft, a small bulbous structure is added. What does it contain and how does this WiFi system work?
19
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1answer
13k views

What exactly distinguishes a beacon light from a strobe light?

Different sources seem to have different opinions: Wikipedia: Aircraft warning lights: These lights include landing lights, red or white flashing beacons, wingtip strobes, and wingtip navigation ...
11
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2answers
11k views

How can I tell if a G430 or G1000 has WAAS or not?

Both the GNS430 and G1000 are/were available with and without WAAS, and I believe it's even possible to upgrade a GNS430 to add WAAS support. When I get into an unfamiliar rental aircraft, is there a ...
10
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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 ...
20
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12answers
6k views

Why are critical flight computers redundant?

At least in airliners, the truly critical computers are redundant. Typically three identical copies of the autopilot computers run in parallel and compare results; if one computer disagrees with the ...
5
votes
2answers
273 views

Is the Bendix/King KMD-550 airplane icon always oriented to the north?

I have a 2001 Cessna 182T with King avionics. The KMD-550 moving map display correctly shows "track up" but the little airplane icon is always pointed to the north. How can I set this so that it ...
7
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2answers
265 views

What safety requirements are there when designing an electronic device to go inside the cabin of an airliner?

I am considering designing and building an automatic air-sampling unit that can be placed in the cabin of an airliner and left unattended for an extended period of time. The device will use an ...
13
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1answer
885 views

What coming changes might render current IFR equipment worthless in the foreseeable future?

I'm shopping for my first aircraft. I have found a very well cared for 172 that is VFR. I also found an IFR-certified 172 that is higher time and cosmetically is showing its age. I inquired about ...
7
votes
1answer
12k views

What connector standard is used for aviation headsets?

The typical aviation headset features two cords with connectors that at first glance are identical. One is a standard 1/4" (0.25 inch) stereo audio jack. What kind of connector is the slightly ...
3
votes
1answer
251 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 ...
3
votes
1answer
682 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",...