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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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Are transponders sometimes referred to as ‘parrots’?

Looking at the A/FD for Anchorage Ted Stevens Intl (PANC), there are a couple of entries in in the airport remarks for a piece of onboard equipment called a ‘parrot’. I am not familiar with this ...
Romeo_4808N's user avatar
-2 votes
0 answers
30 views

What are the effects of RNAV1 on Continuous Climb Operations?

I was on a course about the use of PBN in the world and I’m looking for information about the effect of RNAV1 on CCO. I would greatly appreciate it if you could answer my question
Tissar's user avatar
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2 votes
1 answer
201 views

How is the memory system configured in avionics computers?

In common memory systems determinism is never achived, meaning that you do not know exactly when are you going to obtain the wanted data, as there can be Cache misses that slow down the data supply. ...
Galaxx's user avatar
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17 votes
1 answer
2k views

First airplane with software?

What is the first airplane equipped with software system? Any type of avionics with the computer code, probably the compiled file. I searched in Google, and it sounds like the F-8C Crusader jet ...
Cloud Cho's user avatar
  • 273
9 votes
1 answer
2k views

What is this display for on the Embraer E175?

Caught my attention, never had I seen a display in this kind of overhead position in an aircraft. What is it for?
Gabe's user avatar
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0 votes
0 answers
45 views

Bi-directional Conversion Between CAN and ARINC825: Software or Hardware Necessities?

community! I'm delving into a project that necessitates the conversion of ARINC825 bus input signals to CAN outputs, and vice versa, requiring CAN inputs to be converted back to ARINC825 outputs (my ...
Virgile's user avatar
1 vote
0 answers
40 views

What was the Sperry "Follow Up and Comp. Mech. (Type K9)"

I found online a "Computing Gun-sight" used in WWII B-24 and B-26 bombers: Source Sperry Gyroscope Co., Brooklyn, NY, part # 655432: Source I have looked through the Sperry Corp. Archives ...
johnorun's user avatar
0 votes
1 answer
62 views

Multiple COMM types on the same frequency?

In the manual for the Garmin GNC 255 on page 13, it is stated that: When connected to a position source, the nearest station identifier will be shown for the selected frequency. Frequencies with ...
TheEagle's user avatar
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1 vote
1 answer
122 views

What protections does the designation for aeronautical spectrum provide?

Stated differently: As an aviator, what benefits do I receive from the radio frequencies used by my avionics and ATC being designated "aeronautical protected spectrum" as opposed to just ...
nodapic's user avatar
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8 votes
1 answer
192 views

ADIRU Mounting in Avionics Rack

If I understand correctly, navigational gyroscopes and accelerometers are located within the ADIRU boxes themselves. In order to initialise during aircraft startup, they must be mounted precisely ...
natanijelvasic's user avatar
1 vote
1 answer
148 views

Desired track for aircraft navigation

I am working on a flight planning application and I am need to calculate the desired track(DTK) of the current leg and upcoming legs of a entered flight plan. The formula and logic of solving that is ...
nabpp's user avatar
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0 votes
0 answers
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There is no voltage on the field of the alternator

I’m having a problem with a Cessna 152, the alternator do not increase the voltage of the system, just like “stay” i already try to change the regulator and the alternador and is the same, also when i ...
Ignacio Andrade's user avatar
1 vote
0 answers
45 views

Gulfstream IV-SP Not Sending POS INIT to IRS 3

After powering up and starting up EFIS/ICAS, starting up both FMS’s, I try to POS INIT the IRS’s, but the IRS in position 3 does not receive a position. It’s like it’s on and waiting for it, but it ...
mw174620's user avatar
3 votes
2 answers
581 views

Is the GPS ground track true or magnetic?

This question arises from the Garmin GPS units (eg. GNS530 or GTN750), but the term ground track appears in a general context of GPS units so my question is also general. Is the ground track (TRK in ...
J.Lewandowski's user avatar
0 votes
4 answers
349 views

What format is the output from a GA aircraft microphone? WAV? MP3? or some other format

I'm trying to develop a personal weather station observation to a voice output on Unicom when pilot activated. To start, I need to know what format is in the output from a GA aircraft microphone? WAV?...
wwindus's user avatar
  • 17
1 vote
1 answer
107 views

Reasons for ADSB PAPR Report Altitude Errors

We have just test flown a new 1090 ADSB installation, using Apareo Stratus ESG Transponder, which has internal GPS. The PAPR for the test flight show both Baro Alt and Geo Alt errors in the Missing ...
The Doc's user avatar
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4 votes
3 answers
2k views

Aside from simulated dogfights, do F-22 Raptors actively participate in live fire/target practice using live munitions?

I am aware that the F-22 was developed specifically for the air-to-air superiority role, although it has previously proven its worth for multi-role missions (in performing ground strike missions ...
M66's user avatar
  • 134
3 votes
0 answers
154 views

Why does stall warning system require 4 minutes of AC power on the 737NG?

Is it related to the Stall Management Yaw Damper (SMYD) computers starting? But the number 1 stall test is working with no need for waiting. Please provide sources, if available.
Adel Refa'i's user avatar
-1 votes
1 answer
246 views

Is it feasible for an individual with limited current knowledge to undertake the development of an aircraft from scratch? [closed]

The world of aircraft engineering is truly remarkable, and even the smallest components involve a wealth of knowledge. I'm eager to explore this field and embark on the journey of building an aircraft....
Rohit Anand's user avatar
7 votes
2 answers
1k views

With the new MOSAIC rule, would it allow for me to operate my Cessna 172 as an LSA and install experimental avionics?

I know it's still early with the FAA’s Modernization of Special Airworthiness Certification (MOSAIC) Notice of Proposed Rulemaking, but as it is currently written (August 2023), could I operate my ...
Canuk's user avatar
  • 8,472
1 vote
2 answers
180 views

What is this instrument and what is it for?

Can anyone identify this instrument?
Charles Bretana's user avatar
3 votes
1 answer
257 views

Manual or other information regarding Kollsman Instruments B40331-10-276 altimeter

I just purchased a used altimeter from eBay because it'll look pretty on a shelf, and I may add a computer interface to it. However, I need help finding information on it. This (from what I've been ...
Steve's user avatar
  • 2,218
1 vote
0 answers
90 views

Compressor variable geometry and Engine pressure ratio

I was wondering does a compressor variable geometry and a inlet variable stator vane share any similarities or does these terms have same meanings? I did some digging and all I could find is that CVG ...
Ludwig T's user avatar
  • 389
4 votes
3 answers
3k views

What are Baro-Aiding and Baro-VNAV systems?

I've tried searching online as to what the architecture of these systems look like, and I can't seem to find any hardware information. And if it's not a hardware but instead a software, which software ...
RattMuscle's user avatar
1 vote
2 answers
201 views

4 Basic Forces of flight [closed]

I am looking for shortened but precise and understandable definitions for the 4 forces of flight for an essay I have to do (Lift, Weight, Thrust and Drag) or key parts I need to emphasise. Any help or ...
Nathan.moors2's user avatar
11 votes
2 answers
2k views

At what point is the input data to glass cockpit PFDs converted to digital?

At a very basic level, primary flight displays take data from sensors, do calculations, and display the results on a screen. Of course, because they are digital computers, the input must be digital, ...
Someone's user avatar
  • 7,097
2 votes
1 answer
186 views

Does the Garmin G-1000 contain a database of airport information?

Some modern avionics contain airport information similar to what is published on charts and in the FAA's Airport/Facilities Directory. Does the G-1000 keep airport information in a database that can ...
Michael Hall's user avatar
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0 votes
1 answer
421 views

What is a Integrated Avionics Unit (IAU) and is it related to a IMA?

Reading through a TBM 930 avionics handbook, I came across the integrated avionics unit. What does this do and how does it work? Also, why does the auto pilot only follow one flight director as seen ...
Boeing787's user avatar
  • 6,464
1 vote
0 answers
103 views

ATSU AOC software for A320 - how to change mass units for OOOI msgs from LBS to KGS

There are 2 A320 acft; one which transmits OOOI msgs with FOB in LBS and one with FOB in KGS. We want to maintain records in KGS but since the values are auto-parsed into our ops software we have to ...
Adrian's user avatar
  • 111
3 votes
2 answers
1k views

How does the GMU44 magnetometer differ from a magnetic compass?

In comments to Is the Garmin G1000's heading indicator based on a Magnetic compass?, it's claimed that the GMU44 magnetometer is not a magnetic compass. I don't understand this claim, as the device is ...
Toby Speight's user avatar
  • 1,107
2 votes
0 answers
95 views

Is there historical evidence whether or not FAR §21.9 applies to owner-manufactured avionics?

Looking at an explanation of §21.9 (formerly §21.303(b)2), it seems very straightforward for an owner to produce a part for an ...
Kenn Sebesta's user avatar
  • 5,142
4 votes
1 answer
233 views

What was the first programmable computer used in a flight-related role on an aircraft?

What was the first programmable digital computer, or device containing a programmable digital computer, used on an aircraft or spacecraft for a purpose related to flight? To use modern devices as an ...
Someone's user avatar
  • 7,097
0 votes
0 answers
128 views

Why is the APU controller and ECB located aft without ventilation on Boeing and Airbus aircraft?

On Boeing and Airbus aircraft, the APU controller and electronic control box (ECB) is located aft. Why is it located here, where no ventilation is available? Why it is isolated from different line-...
Muhammad Shoaib's user avatar
2 votes
0 answers
313 views

Air density factor when calculating Airspeed

I am making my own attitude indicator / AHRS, like a Garmin G5. I am using two pressure sensors to measure altitude & airspeed via static /pitot lines. Now I know the formula for calculating ...
DMP52's user avatar
  • 21
9 votes
1 answer
2k views

What is that green dashed circle on ND?

I think this is a navigation display from a boeing aircraft I searched around the internet for the meaning of the "green dashed circles" but got nothing. Thanks in advance for your answers!
yoyoyoyo's user avatar
0 votes
0 answers
60 views

How does the entertainment system in aircraft receive moving Map data? [duplicate]

How does the in-flight entertainment system inside an aircraft receive data for the moving map, like position, airspeed, origin and destination? Is it connected to ADS-B receiver or it gets data from ...
Hariom Singh's user avatar
2 votes
1 answer
938 views

Do cell phones interfere with GA avionics?

I think most people know that cell phone signals can interfere with airliner avionics; that's why airplane mode exists. Is this an issue with small GA planes?
Someone's user avatar
  • 7,097
7 votes
2 answers
655 views

Testing magnetos during engine failure

I'm a student pilot (PPL) and the C172 I fly has the following item in the emergency checklist for in-flight engine failures: MAGNETOS...............TEST My ...
Chris's user avatar
  • 559
2 votes
1 answer
469 views

Did the F-16 have an AoA limiter since the very first variant?

Did the F-16 have an AoA limiter since the very first variant or was it added later?
Aymnt's user avatar
  • 21
2 votes
0 answers
806 views

Which Aircraft Utilise Fly-By-Light Controls?

Although I can find reference to the Eurocopter EC135 being a test bed for fly-by-light, I am not sure if it has entered production with the system [1]. The only confirmed aircraft I can find is the ...
AerospaceDoctor's user avatar
2 votes
2 answers
1k views

How does the fly-by-wire on the new F/A-18 Super Hornet work and what is it maintaining?

I am trying to replicate the fly-by-wire (FBW) system of the Super Hornet for a game called SimplePlanes. I was wondering if it is maintaining a certain $g$ number, turn rate, angle of attack, or a ...
WWIIGEEK's user avatar
9 votes
1 answer
1k views

Garmin G1000 'Waves in a Circle' Symbol?

we had this symbol come up on a G1000 and could not find a reference for what it indicates. Could anyone tell me what it means?
Justin's user avatar
  • 91
11 votes
1 answer
427 views

What do the letters "h" and "i" next to TCAS ND symbols mean?

What is the meaning of the letters h and i seen behind the relative altitude on the TCAS ND indication:
Anatolie's user avatar
  • 211
2 votes
1 answer
408 views

Can I work civilian aircraft with just an FAA Airframe certificate?

I am currently in the Air force, but plan on separating after my contract ends. I really like the field of avionics and aviation in general.(I am a B-1 Offensive Avionics Systems guy) However, when I ...
Laiklam's user avatar
  • 21
2 votes
1 answer
122 views

What could cause an air data computer interfaced via A429 to only display integer values?

I'm working with a Shadin 2000 air data computer interfaced via ARINC 429 to an Avidyne IFD 550. For some reason, the airspeed tape is flipping between discreet values, and not gradually increasing/...
ARINC_challenged's user avatar
3 votes
1 answer
3k views

Are the terms "FMGS" and "MCDU" just Airbus-terms, or are there technical reasons behind the terminology?

I often see commotions online regarding the terminology. Are they just Airbus vs Boeing terms, or are there technical reasons behind them? In everyday speech FMC, FMS, FMCS, FMGS, CDU, MCDU can all be ...
user avatar
1 vote
1 answer
2k views

Body angle rate and body angular velocity

Are these terms used interchangeably to mean the same things? I'm aware of the conversion between body rates (often, $[p, q, r])$ and Euler rates (commonly, [$\dot\phi, \dot\theta, \dot\psi])$. This ...
WesT's user avatar
  • 13
6 votes
1 answer
980 views

Does the GPWS rely solely on the radio altimeter?

The ground proximity warning system (GPWS) uses the radio altimeter to receive information about the distance from the ground. Does the GPWS system work solely based on the information it receives ...
Pilot Collins's user avatar
3 votes
1 answer
302 views

How does increasing the rate of pulse pairs in DME 'search' mode help?

From How does an airborne DME unit differentiate itself? The higher rate in SEARCH [150 PP/S] gives it more opportunity to detect the replies as it has no knowledge of range in search and thus has to ...
Sachin Chaudhary's user avatar
9 votes
1 answer
446 views

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
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