Questions tagged [avionics]

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

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26 views

What is GDL90 protocol message ID 0x69?

I am trying to understand the different message IDs that the Stratus 3 is sending out when using the GDL90 format (Open ADS-B). I understand that 0x65 is an AHRS Message. But I can not find any ...
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1answer
149 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 ...
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116 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 ...
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58 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 ...
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49 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.
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472 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 ...
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1answer
93 views

What is the resistance range for the Bendix King KN-64 DME Photoresistor?

Does anyone know the resistance range for the cadmium sulfide (CdS) photoresistor in the Bendix/King KN-64 DME unit?
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87 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 ...
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103 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 ...
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664 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 ...
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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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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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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 ...
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338 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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1answer
280 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 ...
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202 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 ...
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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 ...
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2answers
264 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 ...
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1answer
53 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)...
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1answer
209 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?
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1answer
146 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 ...
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1answer
144 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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116 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?
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72 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&...
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2answers
210 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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99 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 ...
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165 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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52 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 ...
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1answer
90 views

Does the civil industry use the CAN FD bus?

Does anyone know if commercial aircraft are using the CAN FD communication bus?
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1answer
164 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 ...
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96 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?
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83 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.
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403 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 ...
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1answer
137 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) ...
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2answers
116 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 ...
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1answer
126 views

Are modern airliner avionics spill-proof? [duplicate]

I thought about this today, and didn't find much other than a flight decades ago that made an emergency landing due to spillage causing the trim wheel to uncontrollably pitch the plane down into a ...
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1answer
170 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 ...
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4answers
2k views

What is 'level' to a G1000?

I used to fly a Cessna 550 with 'steam gage' mechanical gyros. The Attitude Indicator always had its flight director solidly on the horizon in level flight -- to the extent a mechanical instrument ...
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1answer
135 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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Which connector and cables are recommended for CAN?

Which mechanical connector(s) and cable(s) is/are recommended to arrange a Controller Area Network (CAN) bus communication or its aerospace counterpart ARINC 826 in the aerospace industry (civil & ...
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1answer
289 views

Does ARINC 825 (Aviation CAN bus) follow the same protocol as automotive CAN buses?

From what I can gather it is derived from the automotive industry standard CAN (Controller Area Network) bus, but I was wondering if they share the same protocols. If you took an automotive bus reader ...
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2answers
135 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
242 views

Does the nearest function on a G1000 allow for listing of anything other than nearest airports?

In non G1000 GPS systems, I have seen several pages for selecting the nearest airport, VOR, NDB, intersections, and waypoint, but in a G1000, I can only seem to get a listing of the nearest airport, ...
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2answers
197 views

What does it mean to “lock on” to a DME ground station?

I was just reading about the working of the DME the other day and then I read a para which said: The aircraft interrogator "locks on" to the DME ground station once it recognizes a particular ...
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1answer
328 views

Is there a brightness switch for the AOA gauge on the F-16?

Is there a brightness switch for the AOA gauge on the F-16? Please share a picture with the panel if you can.
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3answers
3k views

What happens with the avionics if in midair there is loss of power or fuel flow interrupted? [duplicate]

What happens if in midair there is loss of power, how will the avionics perform in such a situation (cockpit display, flight plan)?
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1k views

Why don't aircraft have DME that can automatically convert the slant range to ground range?

Knowing that $a^2 = b^2 + c^2$ where $a = \text{slant range},\ b= \text{ground range},\ c = \text{height}$. Why can't the DME equipment which calculates the slant range then just convert it to the ...
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2answers
714 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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517 views

Where does the Garmin G1000 Nav ID come from?

If you tune in a NAV frequency into your G1000 the ID of the Nav Aid will be shown next to the frequency after some time. In this example SEA: Source: http://...
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199 views

Can I do a dual VOR check on the ground?

I know that the regs are ambiguous on the subject, but does anyone have a good argument as to why or why not you can do a dual VOR check on the ground if the VOR signal is good? For my particular ...

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