Questions tagged [aircraft-systems]

The essential systems found on most aircraft, including power plants, fuel systems, electrical systems, and flight instruments.

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3
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2answers
391 views

What is the difference between the flight control systems of different F-16 models?

It is mentioned that the F-16 A/B variants had an analog flight control system (FCS), while the C/D versions introduced a digital FCS starting from block 40. Can somebody elaborate on the differences ...
2
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1answer
125 views

Can both AC ground and DC ground connect to the same Ground STUD

Can both AC ground and DC ground connect to the same Ground STUD in a plane?
16
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6answers
9k views

Which is more accurate for height measurement: GPS or barometer?

I am not a pilot and have come to this site to ask a question about the measurement of height. This is as a result of the comments made as a result of a question in the Physics Stack Exchange forum "...
2
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2answers
218 views

What information is recorded in aircraft sensor and maintenance logs?

I was wondering what the sensor and maintenance logs in an aircraft look like and what are the values logged? Like maybe the engine temperature, altitude, exhaust temperature, etc. I know the data is ...
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0answers
76 views

Why do F15 air intakes move up and down? [duplicate]

I see it during startup. What is the propose of this?
3
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1answer
1k views

Why doesn't the A320 pack flow indicate HI as it should?

When on ground with APU bleed on and both engines off I have noticed a number of times that the pack flow isn't at the HIGH setting why? As per the FCOM it states that when APU bleed is on the PACK ...
28
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2answers
5k views

Why does the mixture knob spin?

On my first intro flight. I noticed the instructor twisting the mixture knob. I didn't think of asking, but now Im curious.
5
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1answer
711 views

What do a "sheared pump drive" and a "possible sticky vacuum regulator" mean?

The POH for a PA28 (engine driven vacuum pump) says a decrease in pressure on the gyro suction gauge may indicate a possible sticky vacuum regulator. A zero pressure indication means a sheared pump ...
12
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1answer
2k views

What is the purpose of the tiny doors used by the 787's laminar control?

The recent Oct 2021 YouTube video (The Insane Engineering of the 787 by Real Engineering) in the related question remarks: [...] tiny doors whose purpose are a mystery to me with little to no ...
0
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1answer
140 views

Who make the fuel system, cabin pressurization system, and firefighting system?

Who makes the fuel, cabin pressurization, and engine firefighting system for an aircraft with engines on, or in, the wings? Fuel tanks and fuel pipes, pressurized air pipes and heat exchanger, and ...
0
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1answer
104 views

How aircraft manufacturer decide where to mount the engines on the wing?

How do aircraft designers decide how far from the fuselage should engines be? I am specifically talking about engines that are mounted on, in, or under the wing.
4
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1answer
126 views

How does a C208B's climate control system that utilizes bleed air for cabin heat work?

I'm studying the systems on my first turbine-engine aircraft, specifically, a C208B. I know that there is "bleed air heat" that mixes with re-circulated cabin-air. I know that the bleed air ...
47
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1answer
9k views

What does this plus (cross) sign on this electrical panel mean?

I'm looking at a picture of the electrical panel of a Phenom 100 and on it I see a + sign, does anyone have any ideas as to what it's supposed to mean?
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0answers
71 views

What are the steps to change the map light bulb in a Cessna T182T?

T182T has "eye socket" map light. I have removed the ceiling panel and a ring that holds the whole fixture in, but I cannot access the bulb. How do I change the bulb in the map light?
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3answers
3k views

What is the transient bleed valve in a gas turbine engine?

What is a transient bleed valve and what's its purpose ? Also, can you explain the purpose of bleed valves in general?
6
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1answer
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 ...
0
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1answer
196 views

What are these components in a DHS/CBP Predator drone?

In the following diagram showing the "DHS/CBP UAS Platform Configuration", what are these components and what are they used for? PPDM SPMA RCM RVT encoder
9
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3answers
370 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 ...
2
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1answer
219 views

What are these holes at the rear of 747s?

What are these two holes at the rear of most 747s? I've found plenty of answers for the holes on the front of the wing box, but no answers about these back holes.
4
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1answer
147 views

If an airplane has a Vertical Speed Indicator is there a requirement that it be periodically checked for accuracy?

I believe I understand that there is no specific US FAA requirement for aircraft to carry a Vertical Speed Indicator (VSI). I believe I understand the basic operation of a VSI. It measures the rate ...
2
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2answers
1k views

What is the difference between an APU and an ATS?

Is there a big difference between what an Auxiliary Power Unit (APU) and an Air Turbine Starter (ATS) system actually does? My understanding is that an APU provides power for the electrical systems ...
0
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1answer
165 views

Can liquid hydrogen be pumped directly into a jet engine without a heat exchanger? Is it burned as a gas or a liquid in the combustion chamber? [closed]

This NASA research paper on H2 engines includes a diagram of Wesley Kuhrt's 1956 design for a hydrogen-fuelled engine, which has no heat exchanger: (Image by United Technologies Corporation, via NASA....
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8answers
19k views

Where do I start learning about Avionics programming? [closed]

I am a student in his last semester going for a B.S. in Computer Science. I would like to eventually transition into the space exploration industry (NASA, SpaceX, Boeing, Lockheed Martin, etc). I know ...
0
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1answer
236 views

How long does the gear extension/retraction takes on the ATR-42?

Which is typical time of landing gear extension in normal conditions ? I would like to know it especially for the ATR-42 but any other typical value is welcome ! Furthermore can you provide any link ...
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7answers
10k views

Do safety-critical avionics systems run Linux?

I have heard diverse things about this. Some people claim that running Linux on safety-critical avionics systems is a very bad idea. On the other hand some people (who are rather unfamiliar with ...
11
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1answer
5k views

How can aircraft determine true north for inertial navigation systems?

Aircraft use GPS and inertial navigation systems in combination. Sometimes INS needs alignment (i.e. to be told where it is AND what orientation it has). How can an aircraft be be aligned to true ...
3
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0answers
154 views

How Jozza Bombsight worked?

I'm looking some information about the so called Jozza Bombsight used for example on board of the Savoia-Marchetti SM-79 during WWII. Thank you
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2answers
1k views

What are the advantages of using DC electric power over AC, as e.g. done in the EMB 135/145?

In this question I can see the advantages of using AC electric power over DC in large aircraft. However, Embraer decided to produce a "DC aircraft": the ERJ 135/145. What are the advantages ...
28
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1answer
4k views

Why does the B-29 have eight oil needles?

In the image above, quiet flyer and I realized that there are 2 needles in every oil gauge, and there are 4 oil gauges. Well, why in the world are there 8 needles in total? And the optimal range arcs ...
9
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3answers
362 views

Why don't all cylinders have priming lines?

Questions about the primer for carburetor engines. Why does the primer only spray fuel to three (sometimes just one) of four cylinders. (Like Piper Cherokee or Seminole) And is it true that priming ...
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2answers
127 views

Will my CRI CRI twin engine plane fly if I replace the engine with a single 15hp gasoline engine? [closed]

I'm using a lighter materials to rebuild plane, to cut down plane weight to 56kg and a 1.2m 3blades propeller.
3
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4answers
2k views

What component of an aircraft generates its electric power?

What component of an aircraft generates the electric power to start the aircraft's engine? For a Rotax 912 engine, I think the magneto generates the electricity, but I'm not sure; I also think about ...
9
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3answers
6k views

What is the difference between a pitot tube and a pitot-static tube?

What is the difference between a Pitot tube and a Pitot-static tube? If an aircraft fitted with Pitot tube and static holes on the fuselage, is it necessary to consider the static pressure ...
22
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3answers
8k views

What is this smoke coming from an F/A-18 shortly before takeoff?

Watching a video of F/A-18 fighter-jets taking off, I noticed some sort of gas blowing out behind the canopy shortly before the start of the takeoff roll. Here's a screenshot: In some videos the ...
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1answer
335 views

What is the difference between aircraft integration and assembly?

I have never had a clear understanding of the difference between aircraft assembly and integration. My understanding is that putting together the airframe alone is assembly and putting together the ...
2
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1answer
156 views

Why does the A320 IR2 MEL OPS procedure suggest to switch to ADR3?

The A320 34-10-05B IR2 MEL OPS procedure additionally calls for Air Data switching to FO3. When ADR 2 is working fine why replace its data on the FO PFD when only IR data is lost?
0
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1answer
126 views

Is flap-asymmetry protection on airliners still active even on the ground?

On aircraft with flaps, a general certification requirement is that it must not be possible for the aircraft to suffer a loss of lateral control secondary to an asymmetric-flap condition. This ...
22
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7answers
37k views

Why do most single propellers have a clockwise rotation?

Why do most single propellers have a clockwise rotation (seen from the pilot's point of view)? There are though multi-engine planes that have each propeller rotating different directions, but in the ...
15
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4answers
6k views

What are these grilles in the passenger cabin of this 787?

Below the windows, ahead of the seat, there are small grilles. Look: Source: Airliners.net What are those for?
11
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1answer
10k views

What is the capacity of the vent surge tank in an A320?

If the wing tanks of an A320 are fully filled and the fuel expands due to high temperatures then the fuel overflows into the vent tank. My question is, does the fuel get stored in the vent tank? If ...
0
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1answer
42 views

What does pneumatic operated and electrically controlled means? [duplicate]

I was going through A 320 FCOM and didn't understand this term
0
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0answers
41 views

What is the formula to calculate TAS from IAS [duplicate]

I have seen in flight simulators, that the Indicated Air Speed (I.e. IAS) isn't the same as the True Air Speed (I.e. TAS) Is there a formula coded into the aircraft to calculate this?
20
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6answers
13k views

Why is air mixed with bypass air on the A/C of an aircraft?

Air is taken from the compressors, then it is cooled by the air that comes from the ram air inlet. After that, it is compressed and cooled again by an expansion turbine. When finally air is condensed, ...
0
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0answers
37 views

What licenses should I get for the (flight) equipments that I want to make? [duplicate]

For making and selling all equipments of aircrafts what or which licenses should I get? and from where? Will I be able to sell them all around the world? Edit: This question is different than this one....
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3answers
22k views

Why is Python used on aircraft although it may not be certifiable?

I recently had a discussion with people who were active in the aviation industry and told me that one of the main languages/tools they use is Python. On the other hand I have always known that people ...
1
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1answer
169 views

Does ELMS inhibit cabin pressure alarms on the 777, and would the MEC Override Vent be stuck open following an electrical failure?

I found this article rather interesting, but like most things on the internet, they can be wrong. I couldn't think of a better site to address this question. This user says: when ELMS takes over ...
50
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3answers
29k views

What is the technique or procedure to disable/disengage the MCAS on Boeing 737 Max 8 & 9 Aircraft?

What is the technique or procedure to disable the MCAS and manually fly the Boeing 737 MAX 8/9 Aircraft? To clarify my question, what I'm asking is can the pilot disengage the MCAS and if so, how do ...
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2answers
450 views

In an airplane wing, which control surfaces are primary, and which ones are secondary?

I got this device detail of a wing. Those parts are: 1: wingtip fence, one of the wingtip device beside winglet. 2 & 3: aileron. 4: flap track. 5 & 6: slat. 7 & 8: flap. 9 & 10: ...
5
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2answers
2k views

Is a stall warning horn required to fly?

I need an answer in reference to 14 CFR 23.207. I looked there and couldn't say 100% if it was a yes or a no.
-3
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1answer
105 views

Fighter Jets speed [duplicate]

How does an aircraft measures (or calculates) its speed while in air? Which equipment or sensors are used for measurement of speed? Does it takes Earth as a reference frame for its speed measurement ...

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