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Questions tagged [avionics]

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

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Hardware evaluation board for safety critical avionics software (especially Guidance and Autopilot)

Can anyone provide me examples of evaluation boards for prototype testing of guidance software including autopilot. I am looking for boards that are proven, stable and successful with support for any ...
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75 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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242 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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What does the ATR 72's EWD display look like for normal procedures?

Anyone could show/explain how EWD procedure window looks like for Normal Procedures list (and some example procedure maybe)? There are photos on the net showing Emergency/Failures cases but haven't ...
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1answer
188 views

What sort of control mechanisms (i.e., PID controllers) do modern FBW aircraft use?

It's a well-established fact that aircraft like the Boeing 777, and all Airbus passenger aircraft that were designed after the A300, feature a digital fly-by-wire control system. Considering the ...
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1answer
109 views

Will the G1000 cut off transmission over 35 seconds?

I'm new on G1000 system, it says; If the push-to-talk (PTT) Key becomes stuck, the COM transmitter stops transmitting after 35 seconds of continuous operation. I'm wondering if we keep speaking ...
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220 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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77 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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1answer
130 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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1answer
231 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
320 views

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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242 views

Is the 737's autopilot part of the FMS or is it a separate entity?

I was watching a tutorial about the FMS and the autopilot in the 737, and I am consfused. I come from a Cessna background, where there is no FMS, there is only the AP (autopilot). So, is the AP a ...
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1answer
131 views

What is the “A/B AUTO EXT” button for in a Falcon 7X?

What is the "A/B AUTO EXT" button in the overhead panel of the Dassault Falcon 7X? I see it's in the Flight Control section but I don't know what is its purpose. (sorry for low quality image)
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What is the ambient temperature used in RTCA/DO 160?

I was going through RTCA/DO 160D for some work-related issue. I went through the whole document but nowhere does it define what the "ambient temperature" value is? In one place it defines +15 to +35 ...
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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 ...
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1answer
190 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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290 views

What is the standard power supply and voltage supply on modern airliners?

I'm looking at reducing the weight footprint of some of the computer systems on a commercial liner. A big consumer of weight seems to be in power supplies and conversion. Being a computer guy, I don't ...
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1answer
153 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
151 views

Why is an auditory alarm necessary when the autopilot disengages?

The FAA gives one requirement for the autopilot in the following FAR... FAR §25.1329 Flight guidance system. (j) Following disengagement of the autopilot, a warning (visual and auditory) ...
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1answer
151 views

If a SID chart says “GPS… required”, can the plane use a different GNSS?

This US/FAA standard instrument departure says "Note: GPS or DME/DME/IRU required." If the aircraft could tune into a different GNSS like GLONASS, could the pilot still legally fly the departure ...
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1answer
130 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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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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3answers
979 views

Is VOR identification automated in modern avionics?

Is the VOR identification via audible Morse code automated in modern autopilots / avionics? Or does a pilot in an A380 still sits in there, listens and compares the .-. .. -.. to her charts?
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231 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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306 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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What requirements do A&Ps (AMT) have to work on avionics?

Is there any additional requirement for A&Ps to work on avionics or is that even a totally different license? I just wonder why only a few A&Ps I met, also do avionics.
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201 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 ...
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0answers
73 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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1answer
358 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
222 views

What are the ICAO equipment codes for those Garmin units? [closed]

What are the ICAO equipment codes for those Garmin units? Garmin G500 / 750 / 650 WAAS navigators?
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1answer
152 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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712 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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3answers
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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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3answers
477 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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2answers
293 views

Is it possible to isolate COM1 and COM2 on a Garmin G1000?

Is it possible to isolate COM1 to one pilot and COM2 to the other pilot? When I'm getting the ATIS it's hard to listen to both COM channels sometimes depending on the amount of traffic. I used to be ...
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1answer
408 views

How does EEC/FADEC recognize/anticipate engine acceleration/deceleration?

So I'm wondering, when the engine runs at idle and the pilot sets a higher thrust level, what exactly happens, that the EEC/FADEC recognizes, that I want to accelerate? My professor said, it's ...
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1answer
166 views

How does a PFD handle unphysically abrupt changes in the parameters it's displaying?

This question is about human factors requirements in the design of software components displaying instruments in a primary flight display. (It's not about how to implement the software.) Let's take ...
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Should I connect the AR6203 COM radio to the GMA324 audio panel using symmetric or unsymmetryc wiring?

i have this little project to change the Audiopanel and COM to GMA342, GNS430 and Becker AR6203. Airplane is a Piper 28-181. I would like to know if i have to connect the AR6203 to GMA342 in ...
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1answer
196 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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1answer
374 views

Does a Boeing 737 NG have Air Data Modules for the standby Pitot probe and static pressure port?

In other words, how does the ISFD calculate the air data and IR parameters? Or is the ISFD an ADM by itself?
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1answer
392 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 ...
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0answers
149 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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2answers
2k 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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2answers
355 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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2answers
913 views

Why doesn't civil navigation equipment support TACAN?

Now even handheld aviation radios have GPS, VOR and ILS! I wonder why modern LCD screens with radios and navigation doesn't have TACAN? Is it coded, not useful, not certified or not used anymore? I ...
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Are there any failure-proof instruments on commercial airliners? [closed]

Let's assume worst case scenario - nighttime over the ocean, complete vacuum failure, perhaps complete electrical failure (in a "fly-by-pulley" plane perhaps), or at least avionics failure. Is there ...
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2answers
241 views

What makes inertial guidance unsuitable for auto-land?

Above shows the performance of a Lockheed Martin civilian landing system developed in the mid-90's. It works by using the weather radar in SAR mode to update the INS, and the final 100 ft are flown by ...
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1answer
136 views

Is there an FMC not connected to the AP/FD?

Is it possible to have an FMC to compute the performance and navigation without having it linked to an autopilot or flight director? Does/did such setup exist?
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1k views

Airbus control architecture - where does the actual autopilot live?

I'd like to ask for confirmation about the A320 (and, generally, Airbus family) control architecture. The book Aircraft Systems provides the following overview of A3XX computing architectures: ...