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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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Difference Between Air Data Computer and ADIRU on the Boeing 737

Altitude (ALT) Select or​‬ 1 – enables altitude​ reporting from ‭air‬ ‭data‬ computer No. 1. (FCOM) What exactly is this “air data computer”? The FCOM doesn’t seem to provide further details on it. ...
tedioustortoise's user avatar
10 votes
1 answer
2k views

What is this thin stream coming out from somewhere near the engine?

A friend of mine have recently had a flight from Rome to NYC, on a B-787 (Norse Atlantic), and he noticed this thin stream coming out from somewhere in the engine area, seen in this video. From his ...
ISAE's user avatar
  • 203
1 vote
1 answer
346 views

How does a pilot communicate with ATC during a hijacking?

How does a pilot communicate with ATC during a hijacking?
Arunabh's user avatar
  • 121
0 votes
0 answers
26 views

How does a winglet affect aircraft performance? [duplicate]

Winglets are small vertical surfaces attached to the wingtips. They help to reduce the drag caused by vortices at the wingtips, thus improving fuel efficiency. Source How does a winglet affect ...
Arunabh's user avatar
  • 121
3 votes
3 answers
2k views

Can commercial aircraft be equipped with ECM and ECCM equipment?

I've came across an article recently about a commercial aircraft that was traveling from Madrid to Toronto and could not ascend to a higher altitude due to GPS Jamming. With this apparent situation ...
Enzo C.'s user avatar
  • 343
8 votes
1 answer
427 views

Is APU bleed air blow back a genuine risk on the 737?

On a warm day, having the APU1 bleed on provides pressurised air for the air conditioning packs to operate, cooling the cabin. During engine start, this bleed air is redirected to the engine starter ...
tedioustortoise's user avatar
2 votes
1 answer
197 views

Cessna 172 Nose wheel steering

The POH states that ground steering is done by a spring loaded bungee system. How exactly does depressing the rudders apply pressure to the system to actually turn the wheel? Thanks
Mizz's user avatar
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0 votes
1 answer
84 views

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
  • 111
1 vote
0 answers
53 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
190 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
938 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
  • 6,484
0 votes
1 answer
92 views

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
1 answer
240 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 ...
Sachin Chaudhary's user avatar
0 votes
1 answer
101 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
  • 159
-1 votes
1 answer
167 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,...
Breaach's user avatar
  • 159
0 votes
0 answers
26 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
manjit's user avatar
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1 vote
1 answer
257 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 ...
pilot162's user avatar
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7 votes
1 answer
358 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
  • 511
28 votes
2 answers
5k 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 ...
Mateo's user avatar
  • 746
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 ...
Cpt Reynolds's user avatar
  • 4,817
2 votes
1 answer
307 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 ...
Mateo's user avatar
  • 746
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
3k 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
803 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
407 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
4k 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
  • 6,484
2 votes
1 answer
547 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 ...
rosaqq's user avatar
  • 123
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 ...
pilot162's user avatar
  • 2,227
6 votes
1 answer
825 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
  • 2,227
-1 votes
1 answer
122 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
  • 1
4 votes
1 answer
3k 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
  • 28.4k
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?
Boeing787's user avatar
  • 6,484
0 votes
2 answers
362 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
  • 6,484
4 votes
2 answers
997 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
  • 6,484
0 votes
0 answers
138 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
174 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
  • 63
-2 votes
4 answers
994 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
102 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
  • 6,484
0 votes
1 answer
113 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
277 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
141 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
  • 6,484
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
  • 595
2 votes
0 answers
858 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
  • 81

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