Questions tagged [aircraft-systems]
The essential systems found on most aircraft, including power plants, fuel systems, electrical systems, and flight instruments.
346
questions
0
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1answer
52 views
What is the difference between staged and unstaged fuel manifolds? [closed]
Also, I would like to know the difference between pilot, primary and secondary fuel flow.
3
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1answer
90 views
Why do some airplanes have a vertical rudder hinge while some others are canted?
I was thinking that canted rudder hinges are used for modern aircraft while the vertical ones are used for old slow airplanes. But it seems that I was wrong since the SST Tupelov Tu-144 and the ...
2
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1answer
439 views
What is this “stick” on top of Cessna 152's wing, and how does it work? [duplicate]
What is this device? What is it for? Seems that some variants have only one, while some others have two.
Added: As some have two, so what are they? The answers and comments have not explained which ...
1
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1answer
52 views
Where can Cirrus Aircraft VisionJet Oleo Struts Material and Dimension Specifications be found? [closed]
I am looking to get hold of Cirrus Aircraft VisionJet Oleo Struts Material and Dimension Specifications. Can anyone point me to or share where I can obtain these details. So far, I have been able to ...
2
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1answer
247 views
Why couldn’t Boeing just use the stab trim system to do MCAS job?
If I’m incorrect in the question, please correct me. From what I’ve read and gathered the stab trim system essentially did the same before hand? It relies on AoA? And if so, did the computer for that ...
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2answers
166 views
Why did this old Japan Nakajima J1N airplane use a Yagi rather than a parabolic antenna?
Picture source.
As per my understanding, a Yagi antenna is a directional antenna with limited gain, which it broadcasts or receives the microwave signal to and from the front side. It can only ...
2
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1answer
86 views
How does a flux gate compass system work?
I have heard of gyroscopes and AHRS being used for heading indication, but I haven't heard of a flux gate compass system until recently.
What are the principles of its operation and what types of ...
15
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3answers
2k views
What does “synoptic” mean in avionics?
I came across a mention of a display of "graphical aircraft system synoptics" on this page. I think in context that it means "status display" or "summary page"- the page that shows flap position, ...
6
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1answer
207 views
Why does the B737NG need electrical power for aircraft towing?
I have read the AMM for towing and one of the mentioned steps is to supply electrical power. Is it because you need power to turn on the hydraulics in order to pressurize your brakes?
For B737NG
9
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0answers
116 views
Which commercial aircraft can fly Micro-SLOP procedures?
"Strategic Lateral Offset Procedures (SLOP) are approved procedures
that allow aircraft to fly on a parallel track to the right of the
centre line relative to the direction of flight to mitigate ...
3
votes
1answer
113 views
What type of jack is the flight interphone on transport category aircraft?
Recently became an A&P and part of my job is to be on the ground communicating to the pilots during push backs. Started shopping for a headset and have seen various ones with different adapters ...
1
vote
2answers
123 views
What is the future for auto-pilots? [closed]
What is going to change with auto-pilots on commercial aircraft in the next decade or so? Will airlines allow an auto-pilot to control an aircraft when it lands and takes off? Will we start using
5
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1answer
2k views
What's inside the packs? (Airbus a320)
I have some questions about ATA 21, how packs works?... I mean, what's inside them?, what are their mechanims? And How the warm air becomes into cold air?. (On a airbus A320)
I'm starting my major at ...
0
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1answer
110 views
How exactly are checklists shared between the pilots?
Plane startups are shared between the crew
But how exactly? Does the captain do the startup and then ask the copilot if everything is correct? How exactly does it work? Is it aircraft specific or ...
2
votes
1answer
75 views
Why is the alternate static pressure lower than the standard static vent pressure regardless of the venturi effect on both?
I understand that the higher relative airspeed around the body of an aircraft in comparison to the air within the cabin causes the cabin to experience a lower pressure.
However, I was just thinking ...
1
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0answers
85 views
TACtical Air Navigation - Bearing Information
In the TACAN system , how does a change in bearing , would translate to a change in the time (or frequency) domain.
I'll try to elaborate:
I'm aware , of the TACAN operation in general.
let's say ...
7
votes
3answers
4k views
How strong someone should be in order to fly without “power steering”?
Planes these days use fly by wire systems while older ones had a mix of hydraulics with electronic assistance like the MD-11 (And maybe 737-800?).
But what would happen if you lost the electronic ...
5
votes
1answer
275 views
Sukhoi Superjet 100 avionics
The Sukhoi Superjet 100 features flight control system with characteristics copied from Airbus. Side-sticks, same control laws. But does it actually use any of the hardware or software from Airbus (...
3
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2answers
174 views
Why does only one hydraulic intake line from the reservoir have a filter on the Arrow II?
This is a portion of an Arrow II landing gear hydraulic system diagram.
I noticed that there are two intake check valves, one located on each side of the pump, that would allow flow from the ...
2
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0answers
99 views
What is the difference between a pressure switch, high-pressure control, and low-pressure control in a landing gear hydraulic system?
This is an Arrow II landing gear diagram.
In the diagram, the high and low pressure controls look like check valves. The pressure switch is unclear.
What are these three items, and what purpose ...
1
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2answers
359 views
What is the purpose of the shuttle valve in a Piper Arrow's landing gear system?
This is the PA-28R-201 landing gear hydraulic system diagram.
I am wondering how this shuttle valve functions. Research I have done indicates that a shuttle valve blocks one attachment to the valve ...
0
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3answers
95 views
How does thrust relate to horsepower on turbocharged engines?
Could someone please help me understand the difference between horsepower and thrust on turbocharged engines? I believe I have a good understanding regarding the purpose and operation of a ...
3
votes
1answer
406 views
How can the landing gear of an A320 be lowered in the event of a simultaneous hydraulic and electrical failure?
What is the process for lowering the landing gear of an A320 when the hydraulic and electrical systems are not operational? What happens to the aircraft when you lower the landing gear with ...
3
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1answer
129 views
What are the triggers of the MD-80's takeoff configuration warnings?
I'm helping develop sounds for a MD80 simulation and I've noticed the MD has up to 5 alarms that fire when you advance the throttle and the aircraft is not properly prepared for takeoff:
"Beep beep ...
1
vote
1answer
175 views
Robinson R22/44/66 Headset Plug For Bose A20 Headset
What type of headset connector plug is used on R22/44/66 Helicopters?
Is Bose A20 Headset a good one to be used on helicopter?
-1
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2answers
180 views
How are aircraft brakes applied? [duplicate]
I read somewhere that when both rudder paddles are pushed simultaneously it produces a braking effect. Is this true?
If yes, please provide a detailed description of the above mentioned system.
0
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0answers
54 views
Transponder code at gate [duplicate]
Why do you have to select 2000 on the transponder first, prior to selecting the unit off? Is this an ATC consideration?
0
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2answers
163 views
Why is the rotor system of an aircraft and the rotor system of a helicopter different? [closed]
Both aircraft with propeller(variable pitch) and helicopter rotor system can change pitch.
Of course, for helicopter, there is not only collective pitch control but also cyclic control.
The aircraft ...
12
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4answers
588 views
Why would Boeing's MCAS be preferable to a modified Feel and Centering Unit?
According to some sources, the purpose of MCAS on Boeing's 737 MAX variants is to increase the back-force needed to further raise the nose when flying manually at high angles of attack, in order to ...
4
votes
1answer
548 views
Why do Airbus and Boeing have different approaches to bleed air systems? [closed]
Reading Wikipedia and other questions like this, made me curious as to why Boeing uses bleedless architecture for its B787, while Airbus thinks differently for its A350 XWB (and Rolls-Royce thinks the ...
4
votes
2answers
455 views
What is an example of a system like MCAS?
The related question "Is it common for automated control systems to use non-redundant sensors?" does not ask about a specific example, nor are specific examples provided in the answer.
The criteria ...
1
vote
1answer
243 views
Where exactly are the heating elements in the PA-28-180's pitot mast?
I am flying a PA-28-180 but have been unable to find where inside the pitot mast the heating elements would be.
I would like to know this to verify my assumption it does not work in the airplane I am ...
1
vote
2answers
264 views
Why are fuel pump switches separate?
Since engines are run only when the fuel pumps are on and vice versa , why are there separate switches for this? Why can't it be automated ?
1
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1answer
117 views
How does a circulation control helicopter work
This essay describes that this helicopter uses circulation control of the rotor for cyclic and collective control, but not how circulation control works.
https://ntrs.nasa.gov/archive/nasa/casi.ntrs....
4
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3answers
2k views
Is the Boeing 737 MAX 8 MCAS exceptional in operating when autopilot is off?
To the uneducated reader it seems strange the Boeing 737 MAX 8 MCAS system only operates when autopilot is off. I understand the reasoning behind why it was implemented to operate when autopilot is ...
-1
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1answer
229 views
What are the “certain” flying scenarios in which the Boeing MCAS is supposed to assist pilots? [closed]
Boeing bulletin issued last November said
"MCAS provides automatic nose-down inputs to assist pilots in certain
manual, flaps-up flying scenarios, especially at slow airspeeds and
high AOA."
...
47
votes
3answers
23k views
What is the technique or procedure to disable/disengage the MCAS on Boeing 737 Max 8 & 9 Aircraft? [closed]
With regard to the recent crashes involving the Boeing 737 Max 8 aircraft, where according to preliminary reports, it appears to be related to the MCAS, which is a safety system that pushes the nose ...
0
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2answers
94 views
Pitot tube pressure question
I have this question is the pressure measured in the entry of the pitot tube the same when the plane is flying headwind or turning a 360 degree turn while maintaining the same indicated airspeed?
0
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2answers
203 views
Do you have to lubricate the shock strut?
I have a school report about the lubrication on the shock strut and I was wondering if there is a specific type of lubrication they apply it on.
This is for Cessna 150-152
9
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3answers
3k views
How does a single engine tail wheel landing gear airplane turn when it is on the ground?
Say Cessna 140 as in this video, look like no additional device to make it turnable when it on the ground. It is a single engine and a tail wheel landing gear. Then, how does it turn?
9
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2answers
1k views
Where do standard torque values in maintenance manuals come from? [closed]
Maintenance manuals of today's civil aviation aircraft (from both Boeing (e.g., B-737) and Airbus (e.g., A320)) have special chapter to describe "standard torque value" for fasteners and connections. ...
2
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1answer
278 views
What does a white diagonal line mean on an Airbus ECAM DU?
When my A321 powers up, the lower ECAM DU shows only a diagonal white line. What does it mean and what would be the fix?
3
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1answer
225 views
Can the real time operating system used in aviation equipment be certified by itself?
Can the real time operating system used in aviation equipment be certified by itself, or must it be a part of some software certification effort?
I'm asking for getting a certificate of 178C. I don't ...
2
votes
1answer
141 views
Turbofan engine 2 spool - Turbine drives the compressor or Starter drives the compressor [duplicate]
I have read somewhere regarding turbofan engine 2 spool that says
"LP or HP turbine will drive the LP or HP compressor"
"During engine starting, the starter will drive the HP compressor via the ...
4
votes
1answer
307 views
In normal condition, is the Airbus A320 APU fuel supplied by the main engine boost pump only?
I have a question relating to APU fuel system.
As said in material, there are 2 system supplying fuel for APU to operate. 1st one is primary and 2nd one is secondary.
In the 1st system or low ...
3
votes
1answer
532 views
How is the F-22's nacelle/engine bay ventilated?
How is the aircraft skin around the engine bay in the F-22 cooled?
As in the F-35, there are scoops below the wings, which provide ram air around the engine bay, but you don't see any scoop around in ...
-1
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1answer
499 views
Hydromechanical/Electronic fuel control system [closed]
Can someone explain the picture below which represents hydromechanical/electronic fuel control? What's the function of the solenoid on the picture below? What are the differences between solely ...
3
votes
1answer
331 views
Where can I find drawings or diagrams of the Boeing 737-800's internal layout? [closed]
I am working on an alternative fuel system for my final school research. I am applying it to the 737-800. Now I could not find info on how the internals are situated. Of course pictures of the cabin ...
0
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2answers
242 views
Why were these crash location not located via ELT?
On Jan 14th 2019, at 9.10 Indonesia time, the CVR of the crashed Lion Air JT-610 has been found. Another vital device was found earlier.
There are three modern airplanes crashed in to water in ...
1
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1answer
191 views
Difference between FMCF and AIMS on B777?
What is the Difference between Flight Management Computing Function and Airplane Information Management System on B777?
