Questions tagged [avionics]

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

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Will the new Part 23 changes reduce the cost of avionics for existing aircraft?

Will the part 23 changes coming in August help to reduce the cost of IFR GPS avionics? I'm looking to upgrade the IFR avionics in a 1978 Cessna 182.
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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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What's the difference between orientation and position?

In INS (Inertial navigation system) sensors, is there a distinction between the following? Orientation (heading, pitch and roll) Position (latitude, longitude and altitude) Is the orientation ...
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What is the history of glass cockpits?

All glass cockpits seem to have the same basic setup for the primary instruments. Altitude tape on the right, air speed tape on the left, turn coordinator on top and an artificial horizon in the ...
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1answer
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What causes the phase to change in a VOR?

I get the light house analogy, and how the VOR essentially works, although I'm wondering what actually causes this phase shift? As it hits magnetic north the variable and reference signal are in phase,...
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How does the VOR receiver pick up the signal and how are the needles controlled?

Knowing the basic principle of a VOR and how it works, I am interested to know how the receiver works. What exactly makes the needle deflect? And how does this deflecting mechanism know how much to ...
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442 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 ...
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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 ...
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What makes inertial guidance unsuitable for auto-land?

Above shows the performance of a Lockheed Martin civilian landing system developed in the mid-90s. 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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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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Do 121.5 MHz ELTs have to be replaced with 406 MHz models?

There has been a lot discussion about replacing 121.5 MHz emergency locator transmitters (ELTs) with 406 MHz ELTs, since 121.5 MHz ELTs are no longer monitored by satellite. Are private planes ...
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Are there general accuracy requirements for aircraft power supplies?

Let's say I have some LRU device that requires some DC voltage to be powered on. Are there any general requirements in aviation/aerospace that say how accurate that supply voltage must be in order to ...
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Why are callouts of changes in the Flight Mode Annunciator not automated?

With many airlines it seems to be standard that the Pilot Monitoring observes the Flight Mode Annunciator (FMA) and calls out any changes in the autopilot mode displayed on the FMA (I guess to raise ...
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358 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 ...
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Why are general aviation avionics so expensive?

I am quite sure that someone already asked this question, but I couldn't find it on this site. Why are avionics for general aviation aircraft so expensive? For example: The Garmin® G5 $ 2,149.00 ...
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1answer
354 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 ...
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576 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 ...
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Is it possible to hack an airplane while it's moving (in general)?

I recently searching Airbus Careers section, and I can say that I saw too many Cyber Security job positions. It was saying in the job description that there is a need of having knowledge about ...
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1answer
829 views

Are there aircraft exemptions for CPDLC in the NAT area?

Another question lists the aircraft that are exempt from the EASA CPDLC rule. Is there a similar exemption for aircraft operating in the North Atlantic?
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What are the differences between FADEC and EEC systems?

Can anyone differentiate FADEC and EEC system in an aircraft Engines? As I was working related to Engine controlling. I got confused of FADEC and EECs. As per some of the doc. I read like EECs are a ...
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1answer
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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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1answer
474 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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213 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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How does this IMU work and how to convert its output into meaningful information?

To understand more about IMUs and IRS, I have chosen the Honeywell 6DF-1N6-C2-HWL Inertial Measurement Unit as an example: I don't see any mention of the output of the IMU in the linked datasheet - ...