# All Questions

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43 views

### Why is the TPA listed on the Chart Supplement (AF/D) sometimes lower than 1,000 AGL? [duplicate]

I'm looking at B19 in Maine, and it recommends a Traffic Pattern Altitude (TPA) of 995 MSL (800 AGL). Wouldn't 1,000 AGL be safer?
2k views

### Could an airliner abort a landing after using the brakes system while landing?

Everyone knows that doing a go-around is a normal procedure, although the go-around happens usually before applying the brakes system (spoilers, ground/air brakes, and/or thrust reversers), but, could ...
85 views

### How accurately do I need to maintain my altitude while VFR-on-top?

Is holding altitude as stringent a requirement when flying VFR-on-top? If the deviation exceeds say 200 feet off a given VFR altitude (i.e. 5500’ heading eastbound) is this as big of an issue for ATC?
51 views

### Is there a benefit to representing a SID/STAR in 3D?

There are several examples of 2D representations of SIDs and STARs on the web. I have yet to encounter a 3D representation of one. Does one currently exist? Are there any benefits of representing a ...
88 views

### Does an airfoil in supersonic flow have zero circulation?

In incompressible flow, the Kutta-Joukowski theorem can be used to relate the lift (per unit span) to the circulation around an airfoil. However, if we look at an airfoil or the flat plate (see below) ...
205 views

### Is it true that high-bypass engines are inherently inefficient at higher speeds?

Power consumption=Kinetic energy=$1/2mv^2$. Thrust=momentum change=$mv$. I keep being told that aircraft engines are most efficient when their exhaust velocity closely matches the freestream. The ...
118 views

### Is QNE pressure altitude? [closed]

In trying to understand pressure altitude better, am I wrong or right when I say this? I am at an airfield. The pressure altitude at that airfield is 200 ft a.m.s.l. If I set subscale 1013 mb on my ...
133 views

### What does “Request Boxing Vectors” means?

I have heard on a request from a pilot: "- Request boxing vectors!" What's the meaning of this non standard phraseology?
78 views

### Can you identify these antenna/items on the belly of a Cessna 172? [duplicate]

Not sure what all these antenna are for. I have my checkride soon and want to make sure I can name everything that might be pointed out. Thank you.
212 views

### What year did the seat belt sign come in to use?

What year did commercial airlines start using a lighted seat belt sign?
298 views

### What is this part on a Cessna 172 engine?

Can any one tell me what this tube with the red is? This is a photo of a 1977 Cessna 172 engine. Looks like the tube is directly connected to the top of the crankshaft.
123 views

### Are being +30 and having a Ph.D. considered as barriers to become an air traffic controller in NAV CANADA? [closed]

The requirements to apply to the training phase of NAV CANADA (to become an air traffic controller) are listed here, in which no upper bound corresponding to the age and the education level of a ...
25 views

### What is the maximal delay between the publication of an investigation report recomending a study and the beginning of this study?

This question is focused on EASA regulations, mainly because the question arise when reading an investigation report written by the BEA. Investigation reports results in lots of recommendations to ...
190 views

### Why haven't we seen virtual reality jet piloting system yet? [closed]

Swedish technology aims to allow truck drivers to work from home. Why haven't we seen virtual reality jet piloting system yet? What are the barriers to the introduction of such technology?
59 views

### Why do planes generally curve north and not south? [duplicate]

I know that the shortest distance on a sphere is a curve and not a straight line, so that's why planes curve when they fly. But why is that planes curve north and not south? For example, when if I hop ...
466 views

### What is this airstrip in Mali?

While randomly browsing on Google Earth and Bing Maps I found an airstrip in Mali. Normally you assume a small village/mining site in the vicinity of the airport but other than the ruins of a supposed ...
202 views

### These “FICON” NOTAM's contractions aren't in the FAA contraction list. What do they mean?

These NOTAMs for KSGF state "Snow" when the icon on the left is hovered over with a mouse. The contraction "FICON" does not appear in the Notam Contractions list. It is currently the middle of June ...
96 views

### Is flap down the same as flap extended to 25degrees? [closed]

Is Flap down command is same as setting the flap angle to 25degrees. Recently I am reading the information related to Flap and got confused with different terminology. Trying to get relation between ...
4k views

### In an engine failure, should I expect less range than with the engine in idle?

I fly a C172 (fix pitch propeller) and when my instructor and I practice a simulated engine failure, we do not turn off the engine, instead we set the engine to idle. In an actual engine failure, ...
46 views

### Where is the 36 month ATPL theory exam validity before CPL/IR test listed and described?

The provider of my EASA Integrated Training Course states that my ATPL theory exams are only valid for 36 months before a CPL or IR skills test. Where is this regulation listed and described? ...
201 views

### Does the payload of an ICBM or regular airplane bomber explode if the ICBM or bomber is shot down?

As the top says, does the payload of an ICBM or regular airplane bomber (please excuse my ignorance) explode if the ICBM or bomber is shot down? So, say a defense laser in space (yes, I know; this is ...
297 views

### 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 ...
2k views

### Why do aircraft piston engines require priming?

Aircraft piston engines generally require priming, but automobile engines don't seem to need it. Why doesn't cranking the engine with the starter pull in fuel mixture that would ignite without help of ...
211 views

### Could a flight ever be considered to be operating under Visual Flight Rules and Instrument Flight Rules at the same time?

In the US, could a flight ever be considered to be operating under Visual Flight Rules and Instrument Flight Rules at the same time? If not, where in the FARs is this spelled out? Consider the ...
69 views

### What is the linkage connecting the body landing gear on the C-130?

I can't seem to find a diagram that includes this tube linking the front and rear body gear on each side. Is it structural, or hydraulic, or maybe something else entirely? Image source: https://www....
211 views

### Why does the A320 still have this old fashioned nose?

Another answer stated that Airbus was less focused on just brand image, and more on aerodynamics, explaining the more rounded nose of it's 320 vs the 737's. But it still has flat cockpit panes which ...
88 views

### Does a glider pilot need to file an IFR flight plan to legally fly in cloud in class E airspace in the US?

Does a glider pilot need to file an IFR flight plan to legally fly in cloud in class E (controlled) airspace in the US? Or could he or she contact ATC and receive a clearance to enter cloud without ...
166 views

### How much does each engine on a Boeing 747 weigh? [closed]

The Boeing 747 weighs 404,600 lbs in total, but how much of that does each engine take up?
35 views

### How the maximum service interval is related to UAVs?

I´ve been reading about the aircraft´s maximum service interval but this concepts is hardly related to the day to day aircraft (civil and military ones of course). How does this concept is related to ...
2k views

### How can I read airport maps when choosing a seat as a passenger?

When I choose seats on an airplane, I usually go for a window seat since I love the view, especially the views of a city on takeoff/landing. Sometimes I get good a view of the city and sometimes I ...
133 views

### What does an XXXX ident mean?

A couple of guys who I met online yesterday claim to have been in the military. One of them was tracking flights earlier and saw a plane with a callsign of XXXX. He said that this was very bad and is ...
172 views

### Help identifying airfield and aircraft from movie “My Spy”

Here's a couple of stills from the movie "My Spy" - the climactic scene takes place at a single-strip airfield with a paved or tarmac 09 runway. My tentative identification of the (clearly unflyable) ...
72 views

### How do the vortex created by wing tips affects the lift? [duplicate]

I’ve been reading about how improve the aircraft performance and I found that for low aspect ratios, the vortex created by the wing tips decrease the lift generated by the wings. Why is this happening?...
3k views

### Would deploying the Space Shuttle's landing gear early have improved safety? [duplicate]

Due to the space shuttle orbiter’s high weight (potentially up to 110 tonnes [121 short tons] in certain abort scenarios, although nominally around 85 tonnes [94 short tons]) and abysmal subsonic ...
239 views

### What is the function of Boeing C-17 Globemaster III in Indian military?

Why does India need Boeing C-17 Globemaster IIIs? What purpose do they serve in Indian military?
101 views

### What can be approach of balancing canard glider model?

There are a lot of instructions out there about balancing classic wing configuration glider models. The center of gravity should be approximately 25% to 30% from the front edge of the wing, which is ...
51 views

### Does thin airfoil theory work at very high angles of attack?

Thin airfoil theory says that lift coefficient is directly proportional to the angle of attack in radians. I haven't been able to find any limit, short of stall, for applying this theory. It would ...
45 views

### Why does Vmca decrease with increasing altitude?

A question from a mock MEP class rating test: Many thanks for your help.
105 views

### What is needed to go from a student pilot license to a private pilot license?

I will be 16 in a few weeks and I really want to get flying so I am currently thinking that I should get a Student Pilots license and then get a Private Pilot License next summer when I am 17 but I ...
190 views

### Why does Pakistan continue to use F-16s?

Why does Pakistan continue to use F-16s even though they have their own JF-17s? What features do Pakistani F-16s have which their JF-17s don't?
110 views

### What are the forces acting on an air particle along curved streamline(wing upper surface)? [closed]

What forces act at air particle at curved streamline (at first 1/4 upper wing surface) , looking from inertial and non-inertial frame of reference? (show free body diagram) Pressure gradient normal ...
146 views

### Why should I not use a “lifting tail” on my ultralight design?

In my misspent youth I designed and built many rubber, gas, and RC models. When I wanted good climb and glide I used a aft CG [60 to 80%] and a lifting tail. I had no stability or control problems, ...
359 views

### How to choose the right ILS when the runway has more than one?

I'm wondering how is the right choose when an runway has ILS x, Y, Z. What should I consider in order to pick one of those for landing?
112 views

### why are the Comet's engines pointing outwards?

As it's visible from the images below, when looking at the plane from the top, the engines point outwards and they are banana-shaped, why is that? (unfortunately I couldn't find a real photo ...
161 views

### Where does fuel from the boost pumps go before engine start?

For example let’s take the PT6A-27. In every video related to engine start I see, the fuel boost pump is turned on, and then the fuel pressure goes up. Example: My ...
1k views

### Why does directional stability decrease at supersonic speeds?

As an aircraft accelerates through the transonic region from full subsonic to to full supersonic flow its directional or yaw stability decreases. What causes this reduction?
81 views

### At what point of the design process the manufactures build their first prototype?

I would like to know when the aircraft manufactures decide to put in practice their designs building the first scaled prototype (or maybe the actual size). Does the design have to accomplish a list of ...
61 views

### Relationship between wing aspect ratio and speed [duplicate]

For some reason, I cannot find a relatively straightforward source online which discusses the relationship of wing aspect ratio and how it affects speeds of an aircraft. Specifically, is there a ...