Questions tagged [aircraft-systems]
The essential systems found on most aircraft, including power plants, fuel systems, electrical systems, and flight instruments.
464
questions
0
votes
1
answer
108
views
What is output by the Seminole's twin alternator system?
The Seminole's alternator system is a 14V 70 amp system. I understand that if one alternator fails, the other one will be able to produce 14V and withstand 70 amps.
When both alternators are operative,...
CommunityBot
- 1
5
votes
0
answers
162
views
Why For A320, On ground, reopening of the pack valve is delayed for 30-60 seconds
I've read in FCOM that, during engine start reopening of the pack flow valve is delayed for 30-60 s to allow second engine start? But isn't it that the pack flow remains closed only for the side the ...
- 689
7
votes
2
answers
688
views
How does the MiG-23 fuel system work?
In what order are the fuel tanks on the MiG-23 used? In other words, which tank is used first, then second etc.?
- 103
0
votes
1
answer
63
views
Manifold Pressure System
Hi to all. I read about how MAP works and have a question. Do constant speed planes like the c182 or pa44 have an additional Venturi (apart from the one in the carburetor) in the induction system past ...
- 126k
0
votes
0
answers
22
views
How to identify DF11 messages in AST48 field data
I have the radar output (Asterix) data.
How to identify the interrogator code sent by aircraft transponder in all call reply
- 1
1
vote
1
answer
172
views
What does the "EMERG BATT switch" and the associated phrase "(if starting battery installed)" mean?
What does the "EMERG BATT switch" and the associated phrase "(if starting battery installed)" mean? I could not understand what the "EMERG BATT switch" and its associated ...
- 2,049
7
votes
1
answer
179
views
Why is my WAAS equipped aircraft telling me to descend sooner than the FAF (KDVT 25L LPV)
I ran into a weird issue today with our G1000 WAAS-equipped aircraft. The aircraft wanted me to begin decent .9nm before the FAF on the KDVT 25L LPV approach. The LPV is considered a non-precision ...
- 12k
2
votes
2
answers
95
views
Longitudinal/Lateral CG envelope for hoist operations
Does a Rotorcraft hoisting CG chart show what the CG will be as the load is hoisted from top to bottom or vice versa?
- 21.8k
28
votes
2
answers
4k
views
How do water bombers pick up water?
I saw a couple of CL-415s near my lake house a few days ago, and it got me wondering, how do they pick up water? What method do they use to get water into the water tanks? How long does it take to ...
- 72.8k
8
votes
1
answer
1k
views
777-300ER venting something from left engine outboard side - what is it?
Crossposting from Metabunk with permission from the thread opener marko.posavec.
Their photo shows British Airways Boeing 777-300ER G-STBF in flight with something producing a contrail or the like ...
- 126k
2
votes
1
answer
160
views
How was the Douglas DC-6 pressurized?
It's my understanding that modern airliners are pressurized using bleed air from the compressor stage. But how did piston-engined aircraft like the DC-6 get pressurized? I couldn't find any answers ...
- 12k
6
votes
4
answers
2k
views
Is the DC-6 Supercharged? And what is a Turbosupercharger?
What it says on the tin. Is the DC-6 supercharged? I thought all planes that fly above around 10,000-15,000 feet need forced induction, but wikipedia doesn't list the DC-6s engines as supercharged or ...
- 21.8k
5
votes
1
answer
3k
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 ...
4
votes
3
answers
1k
views
What are Baro-Aiding and Baro-VNAV systems?
I've tried searching online as to what the architecture of these systems look like, and I can't seem to find any hardware information. And if it's not a hardware but instead a software, which software ...
- 3,250
1
vote
1
answer
334
views
On a Diamond DA-42, under what circumstances will the propeller auto feather?
I will be doing a multi-engine course in a 2006 Diamond DA-42 soon and I'm curious if this is true for the aircraft and under what circumstances the propeller would auto feather. For example, if the ...
- 72.8k
1
vote
2
answers
180
views
How is RNP's onboard performance monitoring and alerting system represented in the cockpit?
I'm trying to understand what is exactly onboard performance monitoring and alerting system related to RNP. Does it display some extent of deviation or just beeps as alarm?
And if that system exists ...
- 3,250
7
votes
2
answers
3k
views
Why is there water coming from underneath the plane?
If you look at 2:10 in this video, you will notice water or something coming from the belly of the challenger 600. Why is this?
- 126k
8
votes
3
answers
1k
views
1978 C152 Battery Discharge in-flight
For the past few months our flying club has been plagued with a problem. The problem is that when we start the plane, we initially have a good surcharge on the ammeter. Then, either we run-up, takeoff,...
9
votes
3
answers
744
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 ...
- 101
10
votes
1
answer
6k
views
Does the Antonov An-225 have an Auxiliary Power Unit (APU)?
Most APUs are installed in the rear, see the above image of an Airbus A380 as an example. On the An-225, no APU exhaust is visible at the rear of the aircraft.
So does the An-225 have an APU, and if ...
- 49.8k
2
votes
1
answer
300
views
How many master cylinders are there in a typical dual brakes Cessna 172?
After searching in the AFMs of the several C172 my flight school operates, all of them describe the system very basically with no diagrams, as exemplified in the following picture:
Is there one ...
- 121
1
vote
0
answers
270
views
Does an Airbus FAP display any indication of a full waste tank?
I have doubt about controls on FAP regarding Waste Tank.
I understand when crew person clicks on Input On button, FAP displays the quantity of Water and Waste tank.
But what happens when Waste Tank ...
- 15.6k
0
votes
0
answers
44
views
How does the air taken from the Gearbox Air Inlet provide the Gearbox cooling? (Also about "Main Gearbox Cooling Air Inlet")
How does the air taken from the Gearbox Air Inlet provide the Gearbox cooling? Is the air taken from the outside transmitted directly to the Gearbox, or is there a separate system?
Also, I couldn't ...
- 2,049
18
votes
2
answers
3k
views
What is the purpose of the fin at the Boeing 787 APU exhaust?
The fin is located under the Boeing 787 APU exhaust as shown in the picture below. Does anybody know the application of this thing or it is used for 'guiding' the APU exhaust? Thanks.
7
votes
2
answers
2k
views
What is this hole at the bottom of the DA40NG body?
This is the bottom of the fuselage of a DA40NG aircraft and where the right wing attaches to the fuselage. What is the thing I'm pointing at with the red arrow in the picture?
As it is written in the ...
- 15.6k
6
votes
1
answer
751
views
What exactly is the winter baffle in parentheses, where is it used and what does it do?
What exactly is the winter baffle in parentheses, where is it used and what does it do? The image is taken from the preflight checklist of the DA40NG aircraft.
- 126k
-1
votes
1
answer
102
views
FMC and MCDU not talking
I have a test bed in which the FMC and MCDU are hooked up to one another.
FMC menu was populated on MCDU and was able to be navigated.
After making some changes to the FMC GPS #2 lines, the FMC ...
- 19.4k
3
votes
1
answer
1k
views
How is the 737 NG/MAX able to operate at a pressure differential greater than that at which the cabin-pressure relief valve operates?
So I was reading about the 737's cabin-pressurization system, and then I came across these two bits of information:
Limitations
Max differential pressure:
Series
Max Diff
1/200's [sic]
7.5psi
...
- 2,959
26
votes
1
answer
4k
views
What would happen if an airplane climbed beyond its preset cruise altitude that the pilot set in the pressurization system?
What would happen? Would the cabin pressure increase too much and cause damage?
- 54.3k
0
votes
2
answers
175
views
When carburettor heat knob is partially open, is the primary air filter closed fully or partially?
I know that when the carburetor heat knob is fully opened, the primary air filter is closed. But what happens to the primary filter when carburettor heat is partially open? Is the primary filter ...
- 54.3k
4
votes
1
answer
1k
views
Did Malaysia flight 370 have a ELT on board?
Couldn't be ELT be used to track its position? And don't airliners have ACARS to identify a crash?
- 54.3k
49
votes
1
answer
12k
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?
4
votes
2
answers
555
views
How do aircraft inverters work and why are they necessary?
How do inverters in aircraft work? And why are they necessary?
- 319
0
votes
0
answers
111
views
Why is the APU controller and ECB located aft without ventilation on Boeing and Airbus aircraft?
On Boeing and Airbus aircraft, the APU controller and electronic control box (ECB) is located aft. Why is it located here, where no ventilation is available?
Why it is isolated from different line-...
- 54.3k
43
votes
4
answers
12k
views
Why do flight control cables not slacken during the cold temperatures at cruise?
Image source
Flight controls in airliners have long cable lengths in between the cockpit controls and the control surfaces. For instance in the picture above: the pilot operates the yoke, which ...
- 8,532
0
votes
1
answer
124
views
Where does the air used in an air cooled oil cooler come from in jet engines?
For example, in a turbofan engine the air is taken from the ambient air outside the engine or is it taken from the compressed air from one of the compressor stages ?
- 126k
4
votes
1
answer
744
views
Why do some planes cage their attitude indicator while parked?
I've noticed that some planes cage their attitude indicators when Parked and uncaged them after start. As seen in this Lear 35 checklist. Why is this?
- 23.1k
-2
votes
4
answers
727
views
Why do helicopters need two pedals? Why is one not enough?
Picture source
Why do helicopters have two pedals (as shown in the picture); why is one not enough? As we know, the pedals provide directional control through the tail rotor, to yaw left or right. As ...
- 2,959
0
votes
1
answer
97
views
Can the ECS pipe/hose run through the aircraft fuel tank?
Hope you can help?
We are in the process of redefining aircraft fuel tank and there might be a possibility that we may need to run the ECS (Environmental control system) pipe through the fuel tank? ...
- 31.6k
0
votes
1
answer
106
views
Safe to use Volkswagen golf mk1 for my ultralight aircraft project? [closed]
Good day house, I'm trying to understand if I should use the Volkswagen golf mk1 (60hp) engine for my ultralight projects..
All advise will be greatly appreciated.. ♥️
- 17k
15
votes
3
answers
1k
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 ...
- 1
2
votes
2
answers
170
views
What is the difference between a reverse and non-reverse bootstrap ACM?
I'm doing a project for my school about aviation and I ran into reverse bootstrap air cycle machines (ACMs).
What is the difference between reverse and non-reverse bootstrap ACMs? Also, which ...
- 126k
-1
votes
1
answer
134
views
How does an aircraft work with ILS [closed]
In what situation will an aircraft show you "LOC*" in FMA?
What signal does the aircraft received when LOC*?(how does the aircraft know it is on LOC*)
And which heading will the aircraft ...
- 3,408
38
votes
3
answers
44k
views
Are fighter jets designed to be so inherently unstable that a human can't fly one unassisted?
I'm told that in order to be more maneuverable fighter jets are designed in a way that makes them impossible for a human to control without the help of a flight computer. Is this actually true? ...
- 1
3
votes
3
answers
3k
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?
- 13
6
votes
4
answers
2k
views
Why is it that some planes require the AC to be turned off during engine start and take off?
I've noticed that some pilots turn off the climate control for start up and takeoff, like the Sr22. Why is this? And has this been phased out with new technology?
- 1,112
16
votes
1
answer
3k
views
Why are the speed brakes on the F-86 deployed when parked?
The lovely F-86 Sabre always seems to have its speedbrakes deployed when parked, to the point that most of the results I found looking for a good photo for this question were scale model forums ...
- 27k
2
votes
0
answers
541
views
Which Aircraft Utilise Fly-By-Light Controls?
Although I can find reference to the Eurocopter EC135 being a test bed for fly-by-light, I am not sure if it has entered production with the system [1]. The only confirmed aircraft I can find is the ...
- 487
1
vote
2
answers
287
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 ...
CommunityBot
- 1
11
votes
3
answers
4k
views
What is the artificial horizon in between the pilots for?
There's always a third artificial horizon, generally closer to the left (Captain's) side, but I've never understood what it's for. Is it just a backup, or does it serve some extra purpose?
- 111