Questions tagged [aircraft-systems]
The essential systems found on most aircraft, including power plants, fuel systems, electrical systems, and flight instruments.
412
questions
1
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1answer
99 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?
0
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0answers
75 views
Why do F15 air intakes move up and down? [duplicate]
I see it during startup. What is the propose of this?
28
votes
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
709 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
103 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.
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 ...
4
votes
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 ...
0
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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?
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 ...
2
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1answer
218 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
votes
1answer
143 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 ...
0
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1answer
193 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
0
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1answer
161 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....
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 ...
10
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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 ...
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
-2
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2answers
126 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
votes
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
votes
3answers
356 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 ...
9
votes
3answers
368 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 ...
1
vote
1answer
323 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 ...
0
votes
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 ...
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?
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....
1
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1answer
168 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 ...
asked Dec 15 '20 at 7:59
George Clooney In a Mooney
4,3412 gold badges20 silver badges47 bronze badges
-3
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1answer
103 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 ...
4
votes
1answer
273 views
Can the Master Caution illuminate without the System Annunciator Panel on the 737NG?
Does the master caution light illuminate only with the System Annunciator Panel?
Or is the master caution illumination also connected to the related system panels?
I mean if there is an indication on ...
-4
votes
1answer
142 views
Viewing and capturing real time values of Tachometer measuring instrument on television set and computer monitor in Aircraft and Automobiles [closed]
https://en.wikipedia.org/wiki/Tachometer
https://patents.google.com/patent/DE2500376A1/en
Is it possible to view and capture real time values of a Tachometer in Aircrafts, Automobiles, Spacecrafts, ...
1
vote
0answers
82 views
Does the order in which engines in commercial airliners are turned on matter? [duplicate]
I've seen videos on youtube where the pilots always turn on engines 4 and 3 (in a B747-4) first and then turn 2 and 1 on after pushback. Is there a reason behind this, and does the same reason apply ...
2
votes
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 ...
0
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0answers
87 views
Can I use Stihl fs250 engine for ultralight aircraft? [duplicate]
RPM 9000
Hp 2.2
Engine weight 6kg
Plane weight 40kg
Body weight. 70
Propellers(2blades) length 30 inches
Wings length 120 inches
0
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0answers
91 views
Make a 3 engine turboprop electric or steam hybrid aircraft?
Was thinking about this, have a 2 engine regular turboprop with a third electric engine for extra performance (imagine a DC3 like the Conroy Tri-Turbo-Three). The 3rd electric engine would be run from ...
0
votes
2answers
426 views
What type of BITE is involved after installing a new display on an aircraft?
There are 3 types of BITE (Built-In Test Equipment):
power up
interruptive
continues
which one of these is being used after installation of a new display on an aircraft?
2
votes
2answers
541 views
How does an outflow valve work mechanically?
Under Environmental control and oxygen systems chapter of Aircraft Maintenance and Repair book by M. Kroes, there's an topic of working of the outflow valve
The diagram is of a valve that also works ...
1
vote
1answer
113 views
What safety precautions are taken for an airline prototype test flight?
Regarding the software, the equipment and the personnel.
Can the crew jump out of the plane with parachutes or is it a bad idea?
Additionally, if you would compare the safety of today and the 1970/80s ...
18
votes
1answer
3k views
How does the fuel pump work in a PA-28 and when should I use it?
Just started flying again after 14 years and I'm taking this to the finish line this time. All my time, up till 10 am today, is in a C172. I did fly a PA 28-151 today and liked it.
I do have some ...
5
votes
2answers
253 views
Ventral masts- what are they?
I have kids working on a model of a Boulton Paul Defiant, a WWII-era fighter plane. When we found images of this plane, it shows two rods sticking vertically down from the belly of the plane. Some of ...
6
votes
2answers
2k views
Flex temperature isn't actually "fooling" the FADEC, right?
I'll be using Airbus terminology here because that's what I know, but I guess the concepts are universally applicable.
The way I understand flex temperature is: It's a user interface for pilots to ...
3
votes
1answer
361 views
Is it possible for Mig 21 at corner speed to extend the flaps to minimize the turn radius? Or this is not an option?
The corner speed is around 330knots if you want to turn better than the enemy is possible to lower the flaps?
-1
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1answer
427 views
What are the missing elements to mandate airliners to have an AoA indicator? [closed]
ONGOING EDIT NOTE (By OP) This question is right now being comprehensively reworked to make it less broad over the course of the next number of days. (That's being done mainly offline, so as to ...
8
votes
2answers
511 views
How can the fuel decrease evenly from both wing tanks when an A320 is running on APU only?
I stumbled over this sentence in a training material about fuel leak:
"If the fuel quantity symmetrically decrease in both wing tanks and the fuel quantity in the center tank decrease, the fuel leak ...
2
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4answers
3k views
How do slats actually work?
I want to know what is the difference between slats and flaps and the mechanism of the slats
This what I know and researched about flaps:
Flaps are a kind of high-lift device used to reduce the ...
6
votes
1answer
411 views
Why is parking brake set OFF before jacking?
I have a question about the procedure to jack the aircraft for wheel replacement. According to the manual, it required to set the Parking brake OFF before starting jacking at the Main Landing Gear.
...
0
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1answer
415 views
What do left handed F-16 pilots do about the right side stick? [duplicate]
I was just watching a video about the Thunderbirds and Blue Angels doing their city fly overs and realized that the F-16 has a right hand side stick, which begs the question "what do left handed F-16 ...
13
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1answer
459 views
Why does the P-3 Orion use an engine driven compressor instead of bleed air for pressurization?
In another question, an answer mentions that the P-3 Orion uses a gearbox driven compressor for cabin pressurization, even though the aircraft uses T-56 turbine engines that supply bleed air in other ...
0
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2answers
139 views
Is rudder deflection sufficient to maintain directional control on the runway at high speed, or is nose wheel steering needed?
If a fighter jet veers off the runaway, is nosewheel steering needed to counter, or can directional control be maintained with the rudder deflection alone? Is there a chance that the rudder ...
7
votes
1answer
427 views
Was the March 2019 Rafale jet ejection incident investigated?
This is one of the wildest stories I’ve ever heard of. Then again, this is CNN’s disaster-a-minute-for-ratings kind of reporting.
https://www.cnn.com/travel/article/france-fighter-jet-ejection-scli-...
3
votes
1answer
777 views
What if one of the navigation lights failed to function on a certified aircraft?
What is the implication if one of the navigation lights failed to function, would it affect the airworthiness certificate of the aircraft?
