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Questions tagged [aircraft-systems]

The essential systems found on most aircraft, including including power plants, fuel systems, electrical systems, and flight instruments.

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Where exactly are the heating elements in the PA-28-180's pitot mast?

I am flying a PA-28-180 but have been unable to find where inside the pitot mast the heating elements would be. I would like to know this to verify my assumption it does not work in the airplane I am ...
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2answers
205 views

Why are fuel pump switches separate?

Since engines are run only when the fuel pumps are on and vice versa , why are there separate switches for this? Why can't it be automated ?
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73 views

What was the threshold for the change that required the MCAS feature on Boeing 737 Max 8 & 9 Aircraft? [on hold]

My understanding from another question on MCAS is that this was introduced primarily due to a change in the location of the engines. I think it's fair to say that you could stall, or create another ...
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1answer
75 views

How does a circulation control helicopter work

This essay describes that this helicopter uses circulation control of the rotor for cyclic and collective control, but not how circulation control works. https://ntrs.nasa.gov/archive/nasa/casi.ntrs....
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3answers
690 views

Is the Boeing 737 MAX 8 MCAS exceptional in operating when autopilot is off?

To the uneducated reader it seems strange the Boeing 737 MAX 8 MCAS system only operates when autopilot is off. I understand the reasoning behind why it was implemented to operate when autopilot is ...
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1answer
186 views

What are the “certain” flying scenarios in which the Boeing MCAS is supposed to assist pilots? [closed]

Boeing bulletin issued last November said "MCAS provides automatic nose-down inputs to assist pilots in certain manual, flaps-up flying scenarios, especially at slow airspeeds and high AOA." ...
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3answers
12k views

How difficult is it to simply disable/disengage the MCAS on Boeing 737 Max 8 & 9 Aircraft?

With regard to the Ethiopian crash of the 737 Max 8 aircraft, where according to preliminary reports, it appears to be related to the MCAS which is a safety system that pushes the nose down to correct ...
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2answers
77 views

Pitot tube pressure question

I have this question is the pressure measured in the entry of the pitot tube the same when the plane is flying headwind or turning a 360 degree turn while maintaining the same indicated airspeed?
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2answers
162 views

Do you have to lubricate the shock strut?

I have a school report about the lubrication on the shock strut and I was wondering if there is a specific type of lubrication they apply it on. This is for Cessna 150-152
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3answers
3k views

How does a single engine tail wheel landing gear airplane turn when it is on the ground?

Say Cessna 140 as in this video, look like no additional device to make it turnable when it on the ground. It is a single engine and a tail wheel landing gear. Then, how does it turn?
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2answers
1k views

Where do standard torque values in maintenance manuals come from? [closed]

Maintenance manuals of today's civil aviation aircraft (from both Boeing (e.g., B-737) and Airbus (e.g., A320)) have special chapter to describe "standard torque value" for fasteners and connections. ...
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1answer
161 views

What does a white diagonal line mean on an Airbus ECAM DU?

When my A321 powers up, the lower ECAM DU shows only a diagonal white line. What does it mean and what would be the fix?
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1answer
135 views

Can the real time operating system used in aviation equipment be certified by itself?

Can the real time operating system used in aviation equipment be certified by itself, or must it be a part of some software certification effort? I'm asking for getting a certificate of 178C. I don't ...
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1answer
104 views

Turbofan engine 2 spool - Turbine drives the compressor or Starter drives the compressor [duplicate]

I have read somewhere regarding turbofan engine 2 spool that says "LP or HP turbine will drive the LP or HP compressor" "During engine starting, the starter will drive the HP compressor via the ...
2
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1answer
140 views

In normal condition, is the Airbus A320 APU fuel supplied by the main engine boost pump only?

I have a question relating to APU fuel system. As said in material, there are 2 system supplying fuel for APU to operate. 1st one is primary and 2nd one is secondary. In the 1st system or low ...
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1answer
267 views

How is the F-22's nacelle/engine bay ventilated?

How is the aircraft skin around the engine bay in the F-22 cooled? As in the F-35, there are scoops below the wings, which provide ram air around the engine bay, but you don't see any scoop around in ...
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1answer
59 views

Hydromechanical/Electronic fuel control system [closed]

Can someone explain the picture below which represents hydromechanical/electronic fuel control? What's the function of the solenoid on the picture below? What are the differences between solely ...
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1answer
118 views

Where can I find drawings or diagrams of the Boeing 737-800's internal layout? [closed]

I am working on an alternative fuel system for my final school research. I am applying it to the 737-800. Now I could not find info on how the internals are situated. Of course pictures of the cabin ...
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1answer
151 views

Why were these crash location not located via ELT?

On Jan 14th 2019, at 9.10 Indonesia time, the CVR of the crashed Lion Air JT-610 has been found. Another vital device was found earlier. There are three modern airplanes crashed in to water in ...
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1answer
88 views

Difference between FMCF and AIMS on B777?

What is the Difference between Flight Management Computing Function and Airplane Information Management System on B777?
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2answers
140 views

In an airplane wing, which one is primary, and which one is secondary

I got this device detail of a wing. Those parts are: 1: wingtip fence, one of the wingtip device beside winglet. 2 & 3: aileron. 4: flap track. 5 & 6: slat. 7 & 8: flap. 9 & 10: ...
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2answers
102 views

Electrical systems in light aircraft

How does the electrical system in a light aircraft such as a Zenith CH-750 or Cessna 150 work compared with electrical systems in larger aircraft? Are the system is different than the electrical ...
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0answers
129 views

Using the APU for heating on the ground with engines shut down

I would like to refer one technical question to you that I couldn’t able to explain myself. It is from the FCOM Supplementary Procedures Chapter of a Boeing 737 Classic. This question concerns the use ...
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0answers
69 views

How does pendulous vane work?

The pendulous vane uses precession to correct a gyro by small jet air, but I do not know how it works. As far as I study, when gyro is tiled, one of the doors open and the other one is closed. This ...
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0answers
55 views

Hardware evaluation board for safety critical avionics software (especially Guidance and Autopilot)

Can anyone provide me examples of evaluation boards for prototype testing of guidance software including autopilot. I am looking for boards that are proven, stable and successful with support for any ...
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1answer
179 views

What is the exact purpose of the string attached between front fuselage & the tail section of the transport aircraft's? [duplicate]

]2 228]3]3 Usually I got to notice a string attached between front fuselage to rear tail section of the transport aircraft's, what exactly might be the purpose or function of it? But comparatively, I ...
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3answers
259 views

Is the purpose of variable pitch propellers to maintain an optimal angle of attack?

I recently had a discussion with an aviation expert, who works as a Flight Instructor, about constant speed propellers - variable pitch propellers - on light piston aircraft. I have always known that ...
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1answer
212 views

Why does Germany is not so advance in aircraft development? [closed]

I tried to see what countries are the most advance in developing aircraft. I found that Germany is not so advanced (CMMIW). Indeed, there is Dornier there beside has share in AirBus. I don't know ...
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1answer
281 views

Why do the A320's centre tank pumps stop working 5 minutes after the low level has been reached?

I'm new here and I'm in training course for Airbus A320. In the training material, it's said that the centre tank pumps are controlled to stop automatically 5 mins after the low level fuel has been ...
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1answer
820 views

What is the difference between redundancy and fault tolerance?

What is the difference between redundancy and fault tolerance in the context of aviation ?
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3answers
111 views

Can someone explain this glideslope question?

The glideslope deviation bar is covering the second upper dot. The required action to meet glideslope beam is to: What does this question mean?
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1answer
74 views

What are the potential threats of having the landing gear dirt from mud in a rectractable landing gear airplane?

Recently I have been flying an aircraft with the landing gear very dirt with mud due to the parking area of the airfield on grass and the meteo conditions in recent days. I wonder what are the threats ...
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1answer
73 views

TCAS II manoeuvres? [duplicate]

What manoeuvres does the TCAS II advise the pilot to make? Is it RA or TA ?
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44 views

How to compute actuator torque requirement for Variable pitch mechanism??

Suggest me any reference to compute the torque requirement for actuator/motor to control the pitch angle of propeller (Variable Pitch Propeller). Thanks in advance Arun Ravindran
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1answer
140 views

What is the material and font used on the panels of most cockpits?

I am working on a project for one of my aerospace engineering classes and was curious to see if anyone knew what type of material is used to make the panels of a cockpit (preferably a 737) as well as ...
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2answers
116 views

General Aviation Ice Protection

Does anyone know if regulation exists making it a requirement for general aviation aircraft to have ice protection systems? And any insights on why general aviation aircraft tend to use rubber boots ...
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1answer
265 views

What are those sensors on the forward (Airbus) A321neo fuselage?

What are those sensors on the forward (Airbus) A321Neo fuselage? If it helps, this is wow air’s TF-DTR.
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1answer
153 views

How was a looping possible with an Alaska Airlines plane? [duplicate]

Someone has stolen an empty airplane from Seattle Airport and crashed it down after performing some loopings. I am wondering how this was possible. (Source)
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2answers
170 views

Does the 2020 ADS-B -Out requirement apply to aircraft with only a wind-driven generator (electrical system)?

Since my J3 Cub was was not originally certificated with an engine-driven electrical system it's clear the 2020 ADS-B-Out mandate (U.S.) does not apply (except where specifically noted in FAR part 91)....
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30 views

Aircraft EFIS Configurability [duplicate]

What should be the general logic to automatically switch between different pages of EFIS during failure of single or multiple displays?
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3answers
346 views

Why does load shedding still occur in jetliners (e.g., 787) when there is so much power available?

I had a few questions about how electrical generator works on an aircraft, the 787 to be specific although I know it is similar for all aircraft. So the 787 engines have 2 VFSG each which are rated ...
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1answer
95 views

Lift and Drag Coefficients using load cell data

I have a MAV and I need to find out the lift and drag coefficients for the wing and tail. I am not available with a wind tunnel so I will be using a load cell along with a separate wind source. Now I ...
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92 views

What is the difference between an Instrument and Equipment?

In an aircraft, what things is an instrument and what things is an equipment? For example the ILS, is the Antennas located in the runway considered to be an instrument or an equipment? Or is there ...
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1answer
171 views

How do check valves regulate the air in a multi-engine airplane's vacuum system?

This is one of the examples of a pneumatic power system in a multi-engine airplane. In systems like this, if one dry air pump fails - let's say the right-hand one - then the check valve manifold ...
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1answer
150 views

What is the ambient temperature used in RTCA/DO 160?

I was going through RTCA/DO 160D for some work-related issue. I went through the whole document but nowhere does it define what the "ambient temperature" value is? In one place it defines +15 to +35 ...
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1answer
434 views

Are pressurized passenger aircraft usually completely airtight?

Various sources on the internet indicate that the passenger cabins on pressurised airplanes are not 100% airtight. I'm not talking about ventilation/pressure valves/cabin pressurisation system, but ...
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207 views

Will the new Boeing NMA be 'more electric' than the current B787?

I understand that the B787 is the 'most electric' aircraft to date, however there have been many issues with the plane, and I'm interested in knowing if the latest Boeing New Midsize Aircraft (NMA) - ...
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1answer
113 views

Why does an engine bleed system failure restrict operating elevation? [closed]

Why are airplanes not permitted to operate to/from airports at over 9,200 ft if Engine Bleed Air Supply System #2 is inoperative?
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2answers
332 views

Why is it necessary for pilots to have trim controls on fly-by-wire aircraft?

On Airbus family airliners why is it necessary for the pilots to have the facility to trim when there is no aerodynamic feedback through the flight controls?