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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Where is PTM message documentation?

In aviation there are passenger transfer messages like these: PTM AY1101/28JUN HELVNO PART1 AY1106/29 HEL 1N 0B AY1108 HEL 1Q 0B ENDPTM Where can I find ...
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2 votes
1 answer
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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. ...
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1 vote
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How to Calculate Duct Pressure of Boeing 747 ECS?

I am creating a home flight simulation expansion of the Boeing 747 classic series and I have come across an interesting and hard to answer question involving the ductwork of the airplane. The 747 uses ...
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-3 votes
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95 views

Where does the Foot Warmer of an Airbus heating? [closed]

1 or 2? The foot warmer of my company's aircraft is not working.
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16 votes
1 answer
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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 ...
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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. ...
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3 votes
1 answer
502 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?
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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 ...
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15 votes
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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 ...
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Can flaps on Airbus/Boeing airliners be deployed at high speeds during cruise, still?

Brief Background of the Incident Mayday Season 22 Features an Episode "Terror over Michigan" (Episode 6) based on the events of TWA Flight 841. The Episode revolves around a Boeing 727 ...
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Who is the manufacturer of the power inverter used by Ampaire electric aircraft?

Please see the picture within this article.
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2 votes
1 answer
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What windshield washer fluids do aircraft use?

What are the fluids currently used on commercial aircraft that have an in-flight windshield washer system (not just a wiper)? And if they exist, are there fluids more "ecological" that could ...
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9 votes
5 answers
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What downsides could there be to not letting your engine's oil temperature get above the given limit to taxi/take off before you do so?

I'm not a pilot, and I'm sure most pilots who fly piston aircraft would know this, but what could happen if you operate an aircraft with an oil temperature lower than what the checklist says you ...
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2 votes
1 answer
132 views

Are there any external reviews of airplanes' control system software?

Is an airplane's control software source code open (or to some extent) to external review? I don't imagine it is open-sourced, but if it is completely a black box, how can we know that any accident is ...
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8 votes
6 answers
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Why is it that only prop planes have mixture?

Prop driven planes have mixture control yet jets don't. Why is this? Even turbine powered props like the SOCATA/Daher TBM have mixture control.
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3 votes
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Are Airbus A320 Cabin Door Exterior & Interior Levers Linked?

Was looking at this video on Airbus A320 Cabin door procedures and was wondering if the exterior door lever is mechanically linked to the interior lever? It seems as if the exterior lever will open ...
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2 votes
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How do I find out if my aircraft satisfies a particular ICAO equipment/surveillance/PBN code?

I have a new, G1000-equipped C172S that just arrived, and I’m trying to figure out the specific ICAO equipment/surveillance/PBN/etc. codes for the aircraft. I’ve been trying to find out where to find ...
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1 answer
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What are the speeds of the windshield wipers on an A320?

In the Airbus A320, the overhead panel wiper selector knob has three settings: Off, Slow and Fast. At what speed do the wipers operate in Slow and Fast mode?
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3 votes
1 answer
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Why do you have to turn off the prop sync when changing the engine rpm? [closed]

I understand how prop sync works, I just don't understand why you have to have to turn it off to switch the rpm. Is there something that I am missing?
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5 votes
1 answer
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The Fokker Universal has a crank you have to spin rapidly upon startup. What is it?

The Fokker Universal is one of my favorite aircraft. There is only one complete representation of it in existence at a museum in Canada. A video series I saw on YouTube tells the story of its ...
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2 votes
1 answer
198 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?
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Why do F15 air intakes move up and down? [duplicate]

I see it during startup. What is the propose of this?
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28 votes
2 answers
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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.
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5 votes
1 answer
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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 ...
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12 votes
1 answer
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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 ...
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0 votes
1 answer
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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.
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1 answer
145 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 ...
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4 votes
1 answer
202 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 ...
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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?
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6 votes
1 answer
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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 ...
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2 votes
1 answer
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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.
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4 votes
1 answer
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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 ...
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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
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1 answer
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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....
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28 votes
1 answer
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 ...
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10 votes
2 answers
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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 ...
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3 votes
0 answers
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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
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-2 votes
2 answers
152 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.
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3 votes
4 answers
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 ...
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9 votes
3 answers
646 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 ...
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9 votes
3 answers
470 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 ...
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1 vote
1 answer
611 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 ...
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0 votes
1 answer
182 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 ...
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1 answer
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What does pneumatic operated and electrically controlled means? [duplicate]

I was going through A 320 FCOM and didn't understand this term
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0 answers
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....
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1 vote
1 answer
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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 ...
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-3 votes
1 answer
134 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 ...
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4 votes
1 answer
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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 ...
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-4 votes
1 answer
153 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, ...
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1 vote
0 answers
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 ...
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