Cody P
  • Member for 5 years, 9 months
  • Last seen this week
How does an auto-pilot control altitude changes?
4 votes

Short answer: it depends on which mode your flight guidance system is in. It can be either number 2 or 3, although sometimes even something else entirely. Whether you're using a target altitude or ...

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Was this Gulfstream way below the glideslope?
3 votes

There's a few very important details to keep in mind here, although I've never flown this approach and I don't have an approach chart. Keeping these details in line it may be closer than desirable but ...

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Can a Boeing 777 be hacked?
3 votes

"Hack" has a variety of definitions, from reading private data off a non-critical system, to disrupting or confusing an avionics mode, to taking control of the plane and locking out pilots. This ...

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What is an autopilot washout filter?
Accepted answer
3 votes

A washout filter is a building block of a control system. As such, it's hard to say exactly where it'd be used, but I'll make some guesses about where it could go. In general it's used for removing ...

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What is this black symbol on a VFR chart?
Accepted answer
3 votes

It appears to be the old Hi-Way drive in theater, given its placement near the highway and direction. It may no longer be such a good landmark as it closed in 2011, though the distinctive clearing is ...

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How loud is a private corporate jet?
Accepted answer
3 votes

It's certainly reasonable to think a business jet cabin is quiet. Several business jet makers pride themselves on having models with quiet cabins. It varies a lot depending on the business jet, and ...

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What is the time derivative of the angle of attack?
2 votes

First we can use the definitions of w, u, alpha, and beta to define $$ \frac{w}{u} = \tan\alpha $$ $$ u = Vcos(\alpha)cos(\beta) $$ Now lets look closer at the first equation you provided using ...

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How is device control software checked for quality?
2 votes

Is there any procedure for QA'ing an airline manufacturer's code? DO-178C requires developing a rigourous and complex quality assurance process. This is handled largely through both internal auditors ...

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What are the issues with building modular aircraft?
2 votes

One reason that aircraft aren't modular is that many aspects of aircraft design are done looking at the whole airplane, not just at its parts. Some examples are: There are various aerodynamic ...

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Why don't aircraft (commercial and military) use reflective visor windshields?
Accepted answer
2 votes

I'll assume you're referring to astronaut helmets only because of their sunglasses-like reflective properties against visual light, not other wavelengths. There are some small efforts by ...

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Why does thrust-to-weight ratio depend from max Mach number?
2 votes

Related: https://engineering.stackexchange.com/questions/8101/how-can-we-prove-that-thrust-to-weight-ratio-depends-by-max-speed In a short answer: In practice Mmax and Thrust to weight ratio are not ...

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Why is the surge line curved?
2 votes

Simply put, it's supposed to follow a constant flow/fanspeed curve but multiple stages and the mechanics of surging make it a lot more complex in practice. The surge line slope on multistage ...

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How to calculate DDM in a ILS dual frequency system?
1 votes

I don't think you're supposed to just average the two together somehow by themselves. The two signals are designed to be used in different zones and in practice have very different signal strengths at ...

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Can I use the autoland mode if the airport is unknown to the FMC database?
1 votes

Right now the only technology to perform a full autoland relies on ILS (and in increasingly rare cases MLS), and then only when the airport and plane allow CAT III operations. Since ILS relies only ...

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Is there a way to avoid the effects of turbulence?
1 votes

I can only answer the second half about guidance systems from a controls system approach. Turbulence is movement through the air and constitutes a disturbance to the system. It's like trying to walk ...

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Can small airplanes dump fuel during flight?
1 votes

Usually no, although in some cases you may be able to dump fuel by exploiting features of the fuel system. Why not on smaller planes? Fuel jettisoning systems were only ever required for transport-...

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