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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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1 answer
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Do GPS systems in modern avionics mitigate against spoofing attacks?

There exist a number of different techniques [PDF] to mitigate (or at least detect) GPS spoofing, but the most effective techniques require access to the military-only M-code [PDF]. However, there was ...
forest's user avatar
  • 236
6 votes
1 answer
1k views

What would cause a Cessna 182T G1000 to show red X's on Manifold, Fuel, M & S Batt Amps?

Our 2006 Cessna 182T G1000 suddenly started showing the following X's on Manifold, Fuel, and M/S Batt Amps. You can see in the second photo, that the batteries are charging when the plane is started. ...
blueionRich's user avatar
1 vote
0 answers
247 views

Before certified GPS, how much did a full IFR panel cost?

Certified IFR GPS navigators are expensive, but the price of even used HSIs and DME seem to bring some perspective to that cost. How much did a full IFR upgrade cost back in the day before GPS?
rgfuller's user avatar
3 votes
1 answer
893 views

What does "DO" in "DO-160" stand for?

What does "DO" in "DO-160" stand for? Is it short for document? I have searched in internet but it only mentions the document details.
Dynamic_equilibrium's user avatar
6 votes
1 answer
950 views

In aircraft ventilation, what is meant by temperature increasing/decreasing for calculating the on-ground threshold?

In an open-circuit configuration, in normal operation, the A320 FCOM states: The open-circuit configuration operates when skin temperature is above the on-ground threshold. On-ground threshold = +12C ...
user38116's user avatar
  • 595
21 votes
3 answers
7k views

Why is the 5G rollout a problem in the USA but apparently nowhere else?

The FAA is concerned that 5G cell phone signals could adversely affect radar altimeters on aircraft. This is because 5G signals are in the 3.7 to 3.98 GHz range, while radar altimeters operate in the ...
Dave Gremlin's user avatar
  • 2,750
7 votes
1 answer
1k views

What does CPLD mean in aviation in general and on this altitude alerter?

I saw the shortcut CPLD on this altitude alerter from a Cessna 210, and could not work out what it could possibly mean: What does it mean on this altitude alerter, ...
TheEagle's user avatar
  • 1,394
7 votes
1 answer
3k views

Why does the INIT page on the A320 MCDU have "FLT NBR" instead of "CALL SIGN"?

My understanding is that the call sign is entered for FLT NBR on the INIT page (e.g. EZY8418), not the flight number (U28418). I have heard of reports of pilots mistakenly entering the flight number ...
user38116's user avatar
  • 595
7 votes
2 answers
548 views

Does the FAA take programming language selection of the aircrafts' avionics as a factor when deciding the aircraft's airworthiness certificate?

It looks like many military/space/aviation instruments are programmed in Ada or Spark. Because these languages claimed and proved their safety. What if your system is not written in these languages? ...
Westack's user avatar
  • 351
3 votes
0 answers
530 views

Is the Morse code identifier required continuously when using a VHF NAVAID for navigation?

I am thinking of getting an MGL N16 VHF Nav radio with the MGL Vega V16 Control head. It has an interesting mode of operation (referred to as SCAN Mode) where the single receiver in the N16 rapidly ...
Charles Bretana's user avatar
1 vote
1 answer
205 views

What are those polygons on the Garmin avionics navigation display?

I'm not pilot yet, just an enthusiast having some fun in MSFS2020. What do those colored lines mean in Garmin avionics?
Douglas Ferreira's user avatar
1 vote
0 answers
68 views

Is the use of 1/8 NPT ports on pitot/static instruments derived from an FAA standard?

On almost every pitot-static instrument used in general aviation aircraft, a 1/8 female NPT port is provided to connect the instrument to the pitot-static system. I was told that is is a requirement ...
user8908459's user avatar
2 votes
4 answers
698 views

What are the current challenges in software engineering for avionics? [closed]

I'm a software engineer working outside the aviation field, but I'm really passionate about avionics and I'd like to do my Master thesis in the area of software engineering for avionics. Unfortunately,...
Matheus's user avatar
  • 37
12 votes
1 answer
1k views

What does "Mods" and then the check marked list of numbers mean on avionics?

Most of the avionics I see have a label that says "Mods" and then various numbers checked 1-15. Image source. What does this information relate to?
spence's user avatar
  • 197
1 vote
0 answers
90 views

How is the voting mechanism and FDI algorithm applied in transport aircraft?

How is the voting mechanism applied in modern transport airplanes for airdata/inertial reference sensors fault detection and isolation (FDI)? Are there any other FDI methods approved by the regulators ...
Priya Prabhu's user avatar
14 votes
5 answers
5k views

What is the difference between autopilot and fly-by-wire system?

I observed a lot of people misinterpret these words. In my opinion, autopilot assists the pilot by inputting the commands to the computer whereas fly-by-wire (FBW) system sends and receives signals ...
Auberron's user avatar
  • 1,567
0 votes
1 answer
1k views

How does the Boeing 737's implementation of RNAV and VOR approaches compare to Airbus? [closed]

How does the Boeing 737's implementation of RNAV and VOR approaches compare to Airbus?
Tuğçe dilek's user avatar
6 votes
1 answer
1k views

Why is the Auto GCAS system on F-16s limited to only 5G?

The automated ground collision avoidance system (Auto GCAS) on the F-16 is set up for only 5G's. If the system predicts an imminent collision, an autonomous avoidance maneuver—a roll to wings-level ...
George Geo's user avatar
  • 2,111
6 votes
1 answer
961 views

Why do some GPS receivers suppress RAIM integrity warnings after you pass the FAF?

RAIM performs an integrity check 2NM from the FAF. If RAIM is lost before the FAF, one should execute the missed approach. However, if RAIM is lost after passing the FAF, some GPS receivers will ...
JoeyMo's user avatar
  • 61
0 votes
2 answers
521 views

How do Luneberg lenses hide a stealth aircraft's real signature?

I thought aircraft was supposed to be stealth and not show up on radar under the right conditions. This article says Removable Luneburg lens type radar reflectors are sometimes attached to military ...
Nederealm's user avatar
  • 303
1 vote
1 answer
218 views

How does Integrated Modular Avionics (IMA) improve reliability and obsolescence mitigation over the federated architecture?

I've been researching this question on why IMA is more reliable, and the common answer seems to be because of the robust partitioning which is reliable and can prevent software fault propagation. But ...
Kavooty's user avatar
  • 13
0 votes
1 answer
301 views

How can I know if the Garmin GTX 345 transponder supports modes A and C?

How can I know if the GTX 345 supports mode A/C? I did not find a mention in the installation manual the capability of mode A/C.
user52906's user avatar
3 votes
1 answer
914 views

Does Boeing use a similar display to Airbus ECAM to view a particular system?

Airbus has a dedicated ECAM panel forward of the throttles which is used to select a system for display on the LCD. Is there a similar panel used to select a particular system for display on Boeing's ...
Robert Weaver's user avatar
0 votes
1 answer
109 views

On IMA systems e.g. A380 how many people are required to preform regular maintenance checks on this system?

I am aware that there is usually 1 or 2 engineers preforming maintenance checks for a particular avionic system on an aircraft at a given moment. For IMA system, is there often more engineers working ...
Kavooty's user avatar
  • 13
0 votes
1 answer
3k 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 ...
EddieG's user avatar
  • 93
4 votes
2 answers
2k 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 ...
Jeff Leard's user avatar
9 votes
3 answers
836 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 ...
hans's user avatar
  • 399
13 votes
2 answers
4k 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 ...
ocirocir's user avatar
  • 1,972
7 votes
1 answer
653 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 ...
Rory McDonald's user avatar
6 votes
1 answer
620 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 ...
Milwrdfan's user avatar
  • 1,789
5 votes
2 answers
313 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 ...
Andrius's user avatar
  • 3,852
18 votes
2 answers
4k 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 ...
hans's user avatar
  • 399
2 votes
2 answers
534 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 ...
quiet flyer's user avatar
  • 22.8k
0 votes
1 answer
344 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)...
trinath karri's user avatar
3 votes
1 answer
280 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?
TerA's user avatar
  • 31
2 votes
1 answer
343 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 ...
Hariom Singh's user avatar
0 votes
1 answer
319 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 ...
nerdfever.com's user avatar
1 vote
1 answer
576 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?
user8908459's user avatar
1 vote
0 answers
93 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&...
Dan's user avatar
  • 9,328
3 votes
2 answers
745 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 ...
aviationenthusiast's user avatar
0 votes
1 answer
251 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 ...
Yicheng's user avatar
  • 61
0 votes
1 answer
268 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 ...
Ryudeki's user avatar
1 vote
0 answers
93 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 ...
ChrisT's user avatar
  • 11
1 vote
1 answer
227 views

Does the civil industry use the CAN FD bus?

Does anyone know if commercial aircraft are using the CAN FD communication bus?
user52906's user avatar
3 votes
1 answer
431 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 ...
Liren Ding's user avatar
0 votes
1 answer
407 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?
Hariom Singh's user avatar
0 votes
0 answers
162 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.
Tetsuya X Gaming's user avatar
2 votes
1 answer
939 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 ...
2NinerRomeo's user avatar
  • 2,223
2 votes
1 answer
351 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) ...
dawg's user avatar
  • 937
0 votes
2 answers
150 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 ...
Ivan Parra's user avatar

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