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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737 ALT DISAGREE Non-Normal Checklist questions

1 choose IAS DISAGREE alert is not shown, and then: 2 Verify all altimeters are set to correct barometric setting. 3 choose DISAGREE alert stays illuminated: and here is the thing, WHY 4 Standby ...
cwcauc's user avatar
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1 vote
0 answers
44 views

Use of Type V platform for regular Air Cargo Transportation with MB-1 chain set

As background, military air transportation is regulated by Technical Orders, Field Manuals, etc. In this case, TO 13C7-1-5 is the one that regulates Platform Delivery System, used for cargo airdrop. ...
daniel Rubio Ferron's user avatar
5 votes
2 answers
2k views

Is it possible to “buddy start” a modern jet aircraft? I was on a 737-(200?) where thrust of one jet was used to start our aircraft

A long time ago I was on a 737 ( I believe -200 but it could been -300) with an inop APU and cross bleed. We taxied out on one engine and snuggled up behind another 737 - it looked like 15 feet from ...
Tangojul's user avatar
1 vote
1 answer
189 views

Could an passenger jet perform a complete power down & up IN FLIGHT? [duplicate]

I've read various references that it is not uncommon that modern passenger jets' computer systems need an occasional reboot to fix some erratic state. Of course, that is done on the ground and ...
ManoG1234609's user avatar
4 votes
1 answer
929 views

Why this Mooney is draining fuel when priming

Today at the flying club, I witnessed a Mooney startup. When the pilot primed the engine, there was a fair amount of fuel (I’m assuming) that was drained near the nose gear. What is the reason for ...
Boeing787's user avatar
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What is the effect of cold temperatures on aircraft gyroscopic instruments?

When it comes to cold temperatures, I know some effects on engine, for example it causes higher viscosity of oil and so higher oil pressure when engine is just started but still cold. But what is the ...
AIRWAYLOVER's user avatar
7 votes
1 answer
2k views

Why does the typical magneto switch have R on the left and L on the right?

I can't think if I've ever seen this be done with the L on the left and theR on the right. Even on my Rotax 914, which is, *ahem*...
Kenn Sebesta's user avatar
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5 votes
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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 ...
Sachin Chaudhary's user avatar
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1 answer
80 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 ...
Breaach's user avatar
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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,...
Breaach's user avatar
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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
manjit's user avatar
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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 ...
pilot162's user avatar
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7 votes
1 answer
316 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 ...
Jonathan Wilkinson's user avatar
2 votes
2 answers
99 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?
Wes's user avatar
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28 votes
2 answers
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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 ...
Mateo's user avatar
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8 votes
1 answer
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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 ...
Cpt Reynolds's user avatar
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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 ...
Mateo's user avatar
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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 ...
Corpsimmons's user avatar
4 votes
3 answers
2k 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 ...
RattMuscle's user avatar
1 vote
1 answer
606 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 ...
Austin A.'s user avatar
2 votes
2 answers
306 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 ...
Alexander's user avatar
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?
Boeing787's user avatar
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2 votes
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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 ...
rosaqq's user avatar
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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 ...
pilot162's user avatar
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6 votes
1 answer
812 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.
pilot162's user avatar
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-1 votes
1 answer
116 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 ...
Ace's user avatar
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4 votes
1 answer
2k 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 ...
Vikki's user avatar
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26 votes
1 answer
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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?
Boeing787's user avatar
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2 answers
220 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 ...
ANGELLO's user avatar
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?
Boeing787's user avatar
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4 votes
2 answers
822 views

How do aircraft inverters work and why are they necessary?

How do inverters in aircraft work? And why are they necessary?
Boeing787's user avatar
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0 votes
0 answers
126 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-...
Muhammad Shoaib's user avatar
0 votes
1 answer
158 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 ?
qsct's user avatar
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-2 votes
4 answers
925 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 ...
AirCraft Lover's user avatar
0 votes
1 answer
100 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? ...
Snezana knowles's user avatar
4 votes
1 answer
1k 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?
Boeing787's user avatar
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0 votes
1 answer
111 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.. ♥️
Ben Fabulous's user avatar
2 votes
2 answers
249 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 ...
zdeněk choleva's user avatar
-1 votes
1 answer
138 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 ...
William Cat's user avatar
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?
Boeing787's user avatar
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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 ...
CameronSS's user avatar
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2 votes
0 answers
747 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 ...
AerospaceDoctor's user avatar
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,...
Preston's user avatar
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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?
Adam's user avatar
  • 133
2 votes
1 answer
241 views

How do the hydraulics in an airplane have constant pressures? What is creating resistance to the pump flow to create constant pressure?

my question comes from the A320 specifically, and I also suppose Boeing jets. Whenever you check the hydraulic system pressures on an A320 it says 3,000 psi, even when you move the flight controls. ...
John's user avatar
  • 21
16 votes
1 answer
2k views

Why doesn’t ACARS just use HF if it has better range than VHF?

Why does ACARS default to VHF if HF has a better range? For example, when requesting ATIS from an airport, it will first try VHF, and if that fails, it will try HF. And if all hope seems lost, it ...
Boeing787's user avatar
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0 votes
1 answer
251 views

Ice Protection System for supersonic aircraft

How does a supersonic transport aircraft IPS system work? Does it work only for the engine nacelle or both engine and wing. I was thinking only for nacelle since the wings are usually highly swept. ...
itsChibi's user avatar
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3 votes
1 answer
603 views

What is needed in a plane to fly approach mode?

Do you need anything other than approach mode to be able to have the plane fly the ILS to minimums? Do you need a EFD (glass cokpit) or can it be done with steam gages as well?
Boeing787's user avatar
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0 votes
1 answer
725 views

Why does engine temperature rise upon applying carburetor heat?

When carb heat is applied, the mixture enriches due to hotter and less-dense air mixing with the fuel. But a richer mixture has the side effect of cooling the engine down. So why does carb heat cause ...
ADK's user avatar
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15 votes
1 answer
6k views

What does the "High Alt Landing" guarded push button on the A320 exactly do?

I am aware that not all variants of the A320 are equipped with the HIGH ALT LANDING guarded push button. I know that it is pushed before landing at high altitude airfields. Was wondering what it does ...
Tap's user avatar
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