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Questions tagged [electrical-system]

The part of an aircraft providing it with electrical power including Generators, Alternators and Ram Air Turbine.

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Has there ever been an airliner design involving reducing generator load by installing solar panels? [duplicate]

Has there ever been a trial/project/design, in which solar panels were incorporated in the design of a commerical airliner (e.g. on the wings), with the aim to reduce fuel consumption by lowering the ...
20
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1answer
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Is aluminum electrical wire used on aircraft?

Aluminum electrical wire got a bit of a bad reputation in household wiring due to reacting badly with terminals not properly rated for aluminum. Properly handled, it works fine, but it's so ...
7
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1answer
265 views

What are possible causes for the flaps not deploying on a Cessna 172?

I would like to seek some expert opinion on why my flaps failed to deploy when I took it to Flaps 20. I was turning from Downwind to Base when I took flaps 20 and noticed that my speed was creeping ...
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0answers
63 views

Are there required standards for gate power cable maintenance?

I am looking for reference(s) addressing gate power cable maintenance, for both 28V DC and 400Hz. Do the FAA or any manufacturers have standards for measuring the connector pins to determine wear?
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0answers
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Ground Power KVA when on stand

How much power from a GPU would a jet, say a Boeing 737, require when boarding passengers or just sat idle on the air bridge? I’m guessing the Aircraft would only consume the full 90kVA ground power ...
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2answers
207 views

Does the 2020 ADS-B -Out requirement apply to aircraft with only a wind-driven generator (electrical system)?

Since my J3 Cub was was not originally certificated with an engine-driven electrical system it's clear the 2020 ADS-B-Out mandate (U.S.) does not apply (except where specifically noted in FAR part 91)....
3
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2answers
180 views

What is the “off-side engine generator” on an A320?

For the A320 family, is the "off-side engine generator" the same as the "emergency generator driven by the RAT"? I can't find the location of the "off-side engine generator" on the A320.
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3answers
396 views

Why does load shedding still occur in jetliners (e.g., 787) when there is so much power available?

I had a few questions about how electrical generator works on an aircraft, the 787 to be specific although I know it is similar for all aircraft. So the 787 engines have 2 VFSG each which are rated ...
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1answer
101 views

What is a Ground Power Dispatch Switch?

I've been going over the new Master Minimum Equipment List (MMEL) for Textron Aviation Model 500 Series Citations and on page 36 a Ground Power Dispatch Switch is mentioned but I can't find any ...
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2answers
682 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 ...
1
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1answer
298 views

What is the exact function of the battery automatic cutoff logic on ground for the A320?

I was reading in the electrical systems of the a320 FCOM and in one of the notes it stated that the batteries have an automatic cutoff logic which prevents them from getting completely discharged when ...
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1answer
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What is an “all-electric APU”?

Understand that the APS5000 used in the B787 is the first all-electric APU for large commercial aircraft. Source: http://www.pwc.ca/en/engines/auxiliary-power-units Sorry if this sounds too ...
1
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1answer
134 views

Is it possible to 'retrofit' electric flight control actuators to replace existing hydraulic actuators on aircraft?

Read a bit about the potential cost savings of replacing existing hydraulic aileron actuators on large commercial aircraft such as the A350/380 with electrohydraulic/electromechanical actuators. ...
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0answers
76 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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0answers
66 views

Where can I find power and heat specifications for EFIS and IFE systems?

I am working on an MSc. thesis project about the electrification of aircraft. Since the rule of thumb is to design the generators for the worst case scenario, I would like to include as much ...
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0answers
61 views

Is there a standard place to find detailed wiring circuit and component information for different aircraft?

Today I was looking into the systems that are affected by the STDBY ATTD (#1 and #2) circuit breakers in a SR22 and I accidentally stumbled upon something that I find very interesting and I've been ...
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2answers
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What happens when all electrical systems in a helicopter fail?

I was thinking of asking this question at Worldbuilding, because it is for a book I am writing, but I hope this site will fit better. You can migrate this question if you find Worldbuilding more ...
1
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1answer
131 views

What type of batteries are used in airline planes? [closed]

In Embraer 145 and Boeing 777 I mean material, recharge cycle, nominal current and voltages. From the comments I don't understand the difference if the plane is turboprop or turbofan.
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2answers
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What is the typical voltage used on jet airliners?

I have seen several parts that use 28 Volts DC, is this a standard for jet airliners (e.g., Airbuses and Boeings).
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1answer
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Why is there an altitude limit if we have an IDG failure on the A320?

In my company’s MEL there is an altitude restriction if we have an IDG failure of 33500 feet why is that?
4
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1answer
295 views

What are the “Start & Acc” and “Pitch stab” circuit breakers for on the Piper Dakota?

I am learning to fly a piper dakota and I found two circuit breakers for which I can't find an explanation: Start & Acc circuit breaker. I understand that 'Start' is for the starter. What does '...
5
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2answers
339 views

How are batteries cooled in passenger aircraft?

What sort of systems are used to cool batteries in the air? Liquid cooled? Air cooled? I am interested in lithium chemistry batteries in the form of either pouch cells or 18650 batteries inside of ...
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2answers
1k views

How do electric anti-icing systems work?

How do they work for GA propeller planes? More specifically, how is it implemented on the leading edge of the wing and propeller blades? I'm more interested in the mechanics of electric heating, not ...
3
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1answer
351 views

What's field excitation in an electrical system?

"A field relay in the GCU (generator control unit) allows or prevents field excitation within the generator. When open, the field relay deprives the associated power relay of its ground, which causes ...
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0answers
364 views

Am I correct about what AC/DC BAT BUS does?

Is the purpose of the AC/DC BAT BUS is to distribute either A/C electrical power and D/C electrical to the things in the aircraft that need them, like i think he whoel ECAM sysytem and displays use A/...
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4answers
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Can quadrotors be used for commercial passenger flights? [duplicate]

Recently, I have been conducting research on more efficient means for vertical lift transportation. One direction I was thrown in was the use of a quadrotor system with vector thrust and artificial ...
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0answers
200 views

Can you identify this (electrical) part?

I've been given an assignment regarding this very small piece, but my professor says he has no information about it other than: It's an electrical insulator of sorts Is used in an aeronautical ...
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1answer
3k views

What will happen to the IDG disconnection mechanism if we press and hold it for more than 3 secs?

I read in the Elec systems chapter that if we press and hold the IDG pushbutton for more than 3 secs it’ll damage the disconnection mechanism. What exactly happens? Also it says that not to disconnect ...
2
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4answers
391 views

What prevents companies like Cessna and Piper from connecting multiple alternators to a single engine?

Firstly, I'm not even sure if there's only one alternator connected to the engine in a C172-like aircraft. But if that is true, then why don't manufacturers connect multiple alternators to a single? ...
2
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2answers
571 views

How is a lead acid battery and a Ni-Cd battery charged on an aircraft?

How is a lead acid battery and a Ni-Cd battery charged on an aircraft, such as an A320? Is it constant current or voltage?
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3answers
7k views

How much electrical power does one generator produce on a large turbofan?

From my related question, now I want to know just how much power does the generator produce? In other words, what is the max rating of the generator? It looks so small and that surprised me, but since ...
17
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2answers
7k views

Where is the generator in a large turbofan of a commercial airliner?

So, where do you put the electrical generator? If it's gonna be coaxial, the only place is the rear (it will be burnt) or the front (it will get in the way of intake). If it's gonna be coupled to a ...
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1answer
653 views

How are the navaids that are on the airport ground powered?

How are navaids (such as the ILS localizer) that are on the airport ground powered? Are they connected to the airport's power? Do they have their own backup power?
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3answers
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Do propellers generate static electricity in flight and how is that handled?

How is the risk of tribocharging (static electricity generation) by the propeller managed on an airplane? Regardless of airplane size, it seems the rotation of the propeller or engine blades could ...
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3answers
2k views

What's the point of separating the Alternator and Battery switches?

What's the point of having a different button for the battery? Why does the alternator turn on simultaneously with the battery? I need an easy and short explanation, if possible.
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3answers
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What is the shed bus in the Phenom 100?

I recently came across a part of the electrical system of aircraft named SHED BUS. I am specifically asking for the Embraer Phenom 100. Source (Page 122), Added ...
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2answers
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How stable is the “customer” power on a commercial aircraft?

This question on Travel.SE got me thinking... Just how stable is the power that's available via the outlets in the passenger cabin on a modern, commercial aircraft? My assumption in my answer that it'...
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1answer
616 views

What causes a “BATT DISCHARGE” CAS message on the Phenom 100E?

In the Phenom100 POH the descriptions for the "BATT DISCHARGE" CAS message is "During a normal system operation, at least one battery is discharging." I'm a bit confused as to what exactly does ...
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3answers
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What happens when disengaging the electricity generators on a B747?

This answer says: If let's say, you [...] disengage the electricity generator of every engine (which cannot be re-engaged without mechanical maintenance), [...]. What exactly happens in the ...
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1answer
197 views

What happens when a capacitor is supplied with a higher voltage than intended? [closed]

When a capacitor is supplied with a voltage of a higher frequency than intended, what will happen? Does the capacitor 'overheat' or 'resonate'?
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3answers
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Would “wind turbine generators” in the bypass stream save fuel for jetliners?

What is the location of an aircraft's alternator, in a large airliner like a Boeing 747 or Airbus A380? How much power does it produce in kilowatts? And what is the possibility of installing it with ...
3
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1answer
729 views

Can a turbofan have a fan driven electrically so as to run at optimal speed?

I just watched this pretty dumbed-down video about the idea of putting a gearbox in a turbofan so the fan can run at its optimum slower speed while the core runs at its optimum high speed. And I ...
3
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2answers
802 views

What does the ATR72-600 MFD System display look like?

I'm curious how MFD System display looks in real life in ATR72-600, especially electrical mode. I've found three different images showing it, but they seems to be ambiguous. Last one attached comes ...
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2answers
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How do virtual circuit breakers work?

In AW189, B787 and few other aircraft/helicopter, the physical breaker has been replaced by virtual breaker, which can be controlled by the MFD (Multi-Function Display). I tried to google the answer, ...
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3answers
6k views

How does the A350/380 operate on Variable Frequency AC generators?

To keep a constant frequency of 400 Hz, most aircraft have a CSD (Constant Speed Drive) associated to the AC generator. On most types (e.g. A320, A330, B737, B747, B777) an Integrated Drive Generator (...
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2answers
271 views

What is the meaing of the circuit breaker marking “Audio/Mkr” in a PA-28-181?

On the PA-28-181 that I fly, there's a circuit breaker called Audio/Mkr. What is that? In the aircraft, there's also a dual GNS430 if that makes it any more specific. I was thinking it could be ...
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2answers
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Why do aircraft use 400 Hz AC instead of the 50 or 60 Hz of wall outlets? [duplicate]

Large aircraft electrical systems usually use 400 Hz alternating current (AC), while common household electrical outlets deliver AC at 50 or 60 Hz. Why the difference?
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1answer
782 views

Are parked airliners always connected to a ground power unit?

I'm wondering if commercial passenger planes, like the A320, are always connected to the ground power unit (GPU) when they are at the gate? Even if for a quick turnaround.
5
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1answer
2k views

How does an aircraft recharge its batteries?

I assume aircraft have batteries that power up all electronic devices on board. But how are these batteries recharged? When the aircraft is on the ground, it can be connected and recharged in the ...
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2answers
4k views

How does the Piper Archer III electrical system work?

I can't seem to understand how the electrical system works: What does the ammeter display? What is said on my POH is that the ammeter displays the alternator output. My question is what output is ...