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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50 views

How to know which NVIS Class is used in an aircraft?

I wonder if NVIS (Night Vision Imaging System) class for a fighter jet is fixed or not? Is it possible that the pilot can wear any NVG (Night Vision Goggle)? If I want to find out the NVIS Class that ...
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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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2answers
75 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 ...
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Can I use Stihl fs250 engine for ultralight aircraft? [duplicate]

RPM 9000 Hp 2.2 Engine weight 6kg Plane weight 40kg Body weight. 70 Propellers(2blades) length 30 inches Wings length 120 inches
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Make a 3 engine turboprop electric or steam hybrid aircraft?

Was thinking about this, have a 2 engine regular turboprop with a third electric engine for extra performance (imagine a DC3 like the Conroy Tri-Turbo-Three). The 3rd electric engine would be run from ...
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2answers
86 views

What type of BITE is involved after installing a new display on an aircraft?

There are 3 types of BITE (Built-In Test Equipment): power up interruptive continues which one of these is being used after installation of a new display on an aircraft?
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2answers
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How does an outflow valve work mechanically?

Under Environmental control and oxygen systems chapter of Aircraft Maintenance and Repair book by M. Kroes, there's an topic of working of the outflow valve The diagram is of a valve that also works ...
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2answers
128 views

Off/On Time vs. “Total AC Time” vs. Offset?

Can somebody please help explain to me the difference between all of these. I understand that "Off/On time" is probably the Hobbs time which is determined by the time my battery master ...
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1answer
73 views

What safety precautions are taken for an airline prototype test flight?

Regarding the software, the equipment and the personnel. Can the crew jump out of the plane with parachutes or is it a bad idea? Additionally, if you would compare the safety of today and the 1970/80s ...
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How does the fuel pump work in a PA-28 and when should I use it?

Just started flying again after 14 years and I'm taking this to the finish line this time. All my time, up till 10 am today, is in a C172. I did fly a PA 28-151 today and liked it. I do have some ...
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2answers
189 views

Ventral masts- what are they?

I have kids working on a model of a Boulton Paul Defiant, a WWII-era fighter plane. When we found images of this plane, it shows two rods sticking vertically down from the belly of the plane. Some of ...
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989 views

Flex temperature isn't actually “fooling” the FADEC, right?

I'll be using Airbus terminology here because that's what I know, but I guess the concepts are universally applicable. The way I understand flex temperature is: It's a user interface for pilots to ...
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Is it possible for Mig 21 at corner speed to extend the flaps to minimize the turn radius? Or this is not an option?

The corner speed is around 330knots if you want to turn better than the enemy is possible to lower the flaps?
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What are the missing elements to mandate airliners to have an AoA indicator? [closed]

ONGOING EDIT NOTE (By OP) This question is right now being comprehensively reworked to make it less broad over the course of the next number of days. (That's being done mainly offline, so as to ...
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2answers
294 views

How can the fuel decrease evenly from both wing tanks when an A320 is running on APU only?

I stumbled over this sentence in a training material about fuel leak: "If the fuel quantity symmetrically decrease in both wing tanks and the fuel quantity in the center tank decrease, the fuel leak ...
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4answers
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How do slats actually work?

I want to know what is the difference between slats and flaps and the mechanism of the slats This what I know and researched about flaps: Flaps are a kind of high-lift device used to reduce the ...
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HEPA filters and Coronavirus [duplicate]

I've been told that the Corovirus size is around 100 nanometers. I know that the HEPA filters in the aircrafts, say A320 type, can eliminate up to 99,999% of all viruses and bacteria. Can they also ...
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1answer
247 views

Why is parking brake set OFF before jacking?

I have a question about the procedure to jack the aircraft for wheel replacement. According to the manual, it required to set the Parking brake OFF before starting jacking at the Main Landing Gear. ...
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1answer
133 views

What do left handed F-16 pilots do about the right side stick? [duplicate]

I was just watching a video about the Thunderbirds and Blue Angels doing their city fly overs and realized that the F-16 has a right hand side stick, which begs the question "what do left handed F-16 ...
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1answer
347 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 ...
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2answers
108 views

Is rudder deflection sufficient to maintain directional control on the runway at high speed, or is nose wheel steering needed?

If a fighter jet veers off the runaway, is nosewheel steering needed to counter, or can directional control be maintained with the rudder deflection alone? Is there a chance that the rudder ...
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1answer
407 views

Was the March 2019 Rafale jet ejection incident investigated?

This is one of the wildest stories I’ve ever heard of. Then again, this is CNN’s disaster-a-minute-for-ratings kind of reporting. https://www.cnn.com/travel/article/france-fighter-jet-ejection-scli-...
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1answer
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What if one of the navigation lights failed to function on a certified aircraft?

What is the implication if one of the navigation lights failed to function, would it affect the airworthiness certificate of the aircraft?
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1answer
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Why does Thrust Reverser need to be operative during the cargo door operation?

It is stated that when the Electric Pump push button is depressed, the electric pump is automatically running as long as the cargo door selector valve is set to either OPEN or CLOSE position. During ...
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Why some airliners landing gear levers have “up” and “off” positions? [duplicate]

As I understand the difference between both is that "off" cuts the hydraulic pressure that retracts the gear, but why can't this be handled by the system itself and needs pilot intervention? Are they ...
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219 views

What is the maximum height for deploying a parachute? [closed]

i see a detachable plane cabin project .When an airplane crashes, the human toll is generally heavy. Based on this observation, Vladimir Tatarenko, a Ukrainian engineer who worked in particular for ...
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534 views

What is meant by a “pressure system” in FAR 91.205?

FAR 91.205 states: § 91.205 Powered civil aircraft with standard category U.S. airworthiness certificates: Instrument and equipment requirements. (a) General. Except as provided in ...
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1answer
279 views

Why is engine #1 still used when taxiing with one engine?

According to the answer in this post Taxiing with one engine: Is engine #1 always used or do they switch? Engine #1 is used because it pressurizes the green HYD system which powers the Nose Wheel ...
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1answer
137 views

Can APU start in-flight using RAT or battery power?

Is it possible for a passenger jet to start its APU using power from the RAT? If so, are there plausible benefits to doing so (like supplying hydraulic pressure to the wheel brakes)? Do modern ...
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51 views

A320 IR2 MEL OPS Procedure

The A320 34-10-05B IR2 MEL OPS procedure additionally calls for Air Data switching to FO3. When ADR 2 is working fine why replace its data on the FO PFD when only IR data is lost?
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378 views

Do helicopter rotors have anti-ice systems like propellers and wings?

Icing disrupts the aerodynamic qualities of wings and props, is there a similar danger with helicopter rotors? Are there de-icing systems to prevent this?
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1answer
119 views

What is the difference between the Flight Control Systems of different F16 models?

it is mentioned that the F16 A/B variants had an analog FCS, while the C/D version introduced a digital FCS starting from block 40. Can somebody elaborate on the differences between them and point me ...
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97 views

How does MCAS communicate with other systems to know if the flaps are retracted or not?

How exactly does MCAS communicate with the flaps setting to know if the flaps have been retracted? I just noticed on the preliminary report for ET302, the flaps were set at 5 degrees. It doesn’t say ...
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1answer
263 views

Does the Ground Proximity Warning System (GPWS) see through clouds?

Or can it only detect terrain on a clear day or night? I’m mostly asking because of PIA268 I know GPWS is much more reliable in todays time, and I’m unsure if the accident flight even had a GPWS ...
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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 ...
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2answers
5k views

How do pilots know that the switch/knob they just switched on/off actually did what it's supposed to do?

With the plethora of switches/knobs/buttons etc present in airplane cockpits, how can pilots be really sure that a button they just pushed (either to enable/disable some electronic system or move some ...
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207 views

How efficient would it be to have a plane with the cockpit in the back?

Would it be efficient to have a passenger planes cockpit move to the back of the plane, rather than the front? What I have in mind is cameras on the fuselage and nosecone that connects to the cockpit ...
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1answer
105 views

Why will windshear inop illuminate after landing in an MD-83?

Why will windshear inop illuminate on the annunciator panel after landing or before starting taxi in a McDonnell Douglas MD-83?
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3answers
274 views

How to identify different pipes / hoses on aircraft engines?

When looking at an aircraft engine (without any cowlings) is there an easy way of identifying what pipes are for fuel, air, oil, hydraulics etc..? Maybe certain fluid pipes are different size ...
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488 views

How does the engine wash improve engine performance?

According to maintenance manual, we usually carry out engine wash (CFM56) with pure water as scheduled task. Pure water is injected into the engine from the LP compressor inlet while the engine is ...
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2answers
219 views

Maximum Flaps extended speed Vfe for full or partial flaps?

I fly Piper Archer/Warriors and the POH states "Maximum Flaps Extended Speed (VFE) – Do not exceed this speed with the flaps extended." I try not to but I occasionally may exceed Vfe with one notch ...
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1answer
4k 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 ...
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In aircraft air conditioning systems what are the differences between the air cycle machine system and the displacement blower type system?

I have seen reference to both these different air conditioning systems but can't understand what the key differences are and where each system would likely be found.. I.e is one system preferable over ...
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1answer
679 views

Is a stall warning Horn required to fly?

I need an answer in reference to 23.207. I looked there and couldn't say 100% if it was a yes or a no. Thank you for all your time. cheers
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1answer
158 views

Do aircraft need special modifications for polar routes?

Does an aircraft need special modification for polar routes?
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2answers
270 views

What happens when auto-pilot fails over the ocean?

Let’s assume the current location puts the aircraft 2 hours from the nearest airport, but the destination is 2 1/2 hours away. Would the pilots hand fly the rest of the way? Are they allowed to fly ...
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1answer
108 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.
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1answer
128 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 ...
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1answer
648 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 ...
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1answer
59 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 ...

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