Questions tagged [terminology]

For questions about words, phrases and definitions that are specific to aviation or used in a different way in aviation.

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6
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1answer
1k views

What are the correct names for the two faces of an airfoil?

Usual case When representing a wing airfoil, often: The lift is positive The upper surface is the one with low pressure. So the airfoil faces can just be called upper and lower surfaces and we ...
6
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2answers
1k views

What is meant by a fused radar track?

Can anyone explain what a fused track is from the perspective of radar?
12
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3answers
12k views

What is the difference between a propeller and a rotor?

I have been making the mistake of using words "propeller" and "rotor" interchangeably when they are not the same thing. What is the difference between a propeller and a rotor?
8
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2answers
44k views

How do terms apron, ramp, tarmac, taxiway, parking area, gate, hardstand relate to each other?

The terms apron, ramp, tarmac, taxiway, parking area, gate, hardstand are used in a way that I cannot understand. Boeing Everett Factory. Photo by Andrew Hunt at Airliners.net (url unknown). Cropped ...
3
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2answers
452 views

Is there anything in any airport called a “warm apron”?

I heard a pilot said they are located at big airports like LAX. But I couldn't find any information about it.
3
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1answer
124 views

What is the name of the figure consisting of a slow revolution around longitudinal axis? [duplicate]

"An airplane performing one slow revolution around its longitudinal axis is performing one of these..." This was a clue on Jeopardy today. The contestant responded with, "What is a barrel roll?" ...
0
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1answer
735 views

What is altitude above surface / ASFC?

ASFC is an acronym frequently seen in official European publications, e.g. used by the French AIS: Also in some ICAO ones, e.g in Annex 4 (Aeronautical Charts) to the Chicago Convention: The ...
12
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1answer
2k views

What exactly are “suitcase handles” in a cockpit?

I was watching Seconds From Disaster about Alaska Airlines 261 (the one with the vertical stabilizer issue) and at one point the copilot tells the pilot to "try the suitcase handles". Is that pilot ...
7
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2answers
5k views

What is the difference between a Boeing Line number and a Block number?

We know that every Boeing aircraft has a Line number, Block number, and MSN number. I want to know what what does it mean by this Line Number or Block number. and what are the difference among these ...
2
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1answer
2k views

What is a GDS (in the context of the airline industry)?

I have been looking at this article and throughout the article they mention GDS's but do not explain the terminology. Does somebody know what they are talking about - For e.g. - Three GDSs emerge ...
0
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1answer
114 views

What does “Constant wind condition during flight” mean?

What is constant wind condition during flight? Is it zero wind velocity at an instant (say at level flight) or wind with constant speed, say 20 m/sec (at steady level flight or whatever it is) Which ...
8
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2answers
1k views

What is the name for the Mitsubishi A6M Zero's one-piece wing/fuselage?

The Wikipedia article on Mitsubishi A6M Zero fighter cites an article from Life magazine published on Nov 4, 1942: The Zero's fuselage and wings were constructed in one piece, unlike the American ...
5
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3answers
11k views

What is a flat rated engine?

I've heard that a "Flat Rated Engine" is an engine where the power is reduced to keep the internal temperature within certain limits when the ambient temperature is above a certain point. Is that ...
3
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1answer
176 views

What is that term to describe the wing motion range?

What is that term naming the range of motion of the wings when on the ground (hanging/drooping) then bends upwards during flight?
3
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2answers
2k views

What is the difference between fuel exhaustion and starvation?

Is there any technical difference between fuel exhaustion and starvation? And what does it mean if a pilot says he has a "fuel shortage"?
2
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1answer
145 views

Where to find comprehensive description of Special Use Airspaces (SUAs)? [closed]

Can you suggest me some document or website where I can learn about Special Use Airspaces? My goal is to understand the following topics: SUA definition Types of SUAs SUA pubblication SUA creation ...
3
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1answer
488 views

What is the difference between directs and shortcuts in the Route Availability Document?

I am studying about directs and shortcuts in aviation. While flying, an airplane can move from an airway to another by using directs or shortcuts. What I want understand is the difference between ...
7
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2answers
969 views

Does the “bat wing” aircraft paint design have a proper name?

I would like to do a web search for different planes that have utilised the "bat wing" paint application noticeable on the wings below? What keywords should I search for?
3
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2answers
1k views

What is the regulatory definition of AOG?

What is the legal or regulatory definition of AOG (Aircraft on Ground)? For example, this is sometimes stamped on a repair order.
3
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2answers
276 views

Which is the technically correct term: Nose Gear or Nose Landing Gear?

Talking about landing gear system, came across my mind the correct and technical name. Is it NOSE GEAR or NOSE LANDING GEAR?
4
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1answer
254 views

What is the difference between SUA (Special Use Airspace) and FUA (Flexible Use Airspace)?

The EUROCONTROL Concept of the Flexible Use of Airspace (FUA) is that: an ASM concept currently applied in the ECAC area and based on the fundamental principle that airspace should no longer be ...
5
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2answers
1k views

What is an Airline?

What is a good definition for the term "Airline"? The term is used extensively, and it's meaning is well understood at the one end of the spectrum: air carriers flying passengers on large aircraft on ...
0
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0answers
253 views

Is there a term for the general design used in most modern fighters?

Is there a term that encompasses the overall design of modern fighters (e.g. F-15, F/A-18, F-14, Su-27, Su-30,33,35,37, Mig-29, J-11, etc.), with dual vertical stabilizers, leading edge extensions, ...
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1answer
1k views

What is the difference between SUA and SAA?

I would like to understand the difference between Special Use Airspace (SUA) and Special Activity Airspace (SAA). I found the following definitions. Eurocontrol Lexicon for SUA (from FAA): ...
5
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2answers
1k views

What is the difference between Flight Test and Test Flight?

What is the difference between Test Flight and Flight Test? Are they the same thing or synonymous?
11
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2answers
2k views

What is the origin for “squawk” having two different meanings in aviation?

In Aviation, a "Squawk code" is a common term for a "Transponder Code". "Squawk 2345 and Ident" But it is also commonly a way to report problems with an airplane. "After I landed, I Squawk'd the ...
7
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1answer
184 views

How are “charter” and “passenger” flights defined in the AIDX standard?

I'd like to know the difference between these flight types in the IATA AIDX standard; specifically, for use in fuel order notifications.
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3answers
2k views

How would one define or explain the term “unloading the controls?”

I've heard people say "unload the controls" or "unload the wing/propeller." What does this mean exactly? It is usually followed by releasing back pressure on the elevators or starting/ending a turn.
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6answers
10k views

Are “Tally-ho” and “no joy” acceptable ATC terms for civil operations?

I keep meaning to ask this question. I heard "Tally-ho" used for the first time by a pilot on Liveatc.net. I know these are pretty standard phrases in military aviation but I wondered if civil pilots ...
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2answers
1k views

What is a hypernym for the ascending and descending legs of a flight?

If an airline flight is everything that happens in between your starting and ending gates. What is the generic term for each time the plane ascends or descends during an air route? In layman terms, ...
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2answers
2k views

What, exactly is “on the MEL”?

The MEL, minimum equipment list, defines whether fault of some equipment on the aircraft prevents it from being dispatched for flight or not. However, sometimes (e.g. in comments to this question) ...
2
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1answer
688 views

What is the difference between landing weight and end-of-mission weight?

Raymer says: Landing is much like taking off, only backwards!....Note that the aircraft weight for landing analysis is specified in the design requirements, and ranges from the takeoff value to ...
16
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3answers
33k views

What is the difference between GPS, GNSS and RNAV?

I would like to know the fundamental difference between GPS, GNSS and RNAV. How are they related each other? Are all/some of them synonyms?
20
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3answers
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How exactly should I understand the term “accidental hull loss”?

How can the IATA claim that the year 2015 saw no accidental hull losses, if we had the Germanwings Flight 9525 accident? Even if this one is not considered "an accident" then there are a few others (...
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2answers
2k views

Is induced drag essentially nothing more than a specific type of form drag?

If I were standing outside on a windy day holding a flat rectangular object such as a food tray up in the wind, orthogonal to the direction of flow, the drag created would be classified, mostly, as ...
7
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1answer
973 views

Is “lower pressurization” the correct term for the 787 Dreamliner?

In this blog, the FA refers to the 787 Dreamliner as having "lower pressurization": http://theflightattendantlife.com/the-boeing-787-8-a-flight-attendant-takes-you-on-an-inside-tour-of-the-dreamliner/...
16
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3answers
3k views

Is it still “landing” in a seaplane?

This probably sounds like a silly question, but I was watching floatplanes land on Lake Union, Seattle, and it got me wondering whether a plane that touches down onto water is still talked about as "...
5
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2answers
4k views

What is the difference between MCP and METO?

I was reading the Cessna 150H POH earlier today and noticed that the manual mentions something like "Normal cruising is done at 65% to 75% of METO power." The Cessna 172S POH charts refer to cruising ...
6
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4answers
2k views

Does the expression “stall speed” have a definition?

I read, not only on this site, that the stall speed of an airfoil doesn't exist, and I usually make the effort to stay away from this expression. While an airfoil can stall at any airspeed, it's ...
5
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4answers
16k views

Why do “angels” mean MSL, not AGL?

In military aviation, crews will sometimes refer to "angels" meaning MSL altitude. However, one might guess that it is a pronunciation of AGL (AnGeL), above ground level. Did it originally mean AGL ...
5
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2answers
596 views

What is the most accurate geometric plane for referencing terrestrial flight attitude?

I have found various definitions for attitude. Merriam Webster: inclination of the three principal axes of an airplane in flight to the relative wind. Wikipedia - Attitude Indicator: the orientation ...
5
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1answer
94 views

What are the names of the forces acting upon the side of a vessel?

People often refer to the four forces in navigation as weight, lift, thrust and drag. Are there separate names for the forces acting upon the side of a craft?
11
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3answers
2k views

Is there a name for change in attitude with respect to time?

I'm in the process of writing a flight-dynamics software program, but I'm not sure what to call the derivatives of the aircraft attitude. If it was in one dimension, they would be the "angular ...
5
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1answer
1k views

What are endplates? How do they work?

Winglets have been discussed fairly regularly, but not much can be found on the topic of endplates. What are endplates, how do they work, and how do they relate to winglets?
3
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0answers
695 views

In simple terms, what are LNAV, VNAV, and Baro-VNAV approaches? [duplicate]

In simple words, what are LNAV, VNAV, and BARO-NAV? Are they all precision approaches and will they cancel the traditional approaches?
3
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1answer
2k views

What term is the EASA equivalent of the DER in the FAA safety assurance process?

When the FAA approves a hardware or software (or mixed) system for use in an aircraft requiring Type Certification, A Designated Engineering Representative (DER) is selected to work with the ...
7
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3answers
2k views

What is a seal in aeronautics?

I've read phrases like "All gas turbine engines use pressurized seals for their shaft bearing compartments to keep [...]" but I do not understand what "seals" means. In spanish we haven't a word for ...
6
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1answer
3k views

In Raymer diagram “Take off parameter- Take off distance”, what is the difference among “balanced field length”, “over 50 ft”, “ground roll”?

Raymer in his book suggests a method to find wing loading W/S (for example we consider jet with 2 engines) (starting from specific thrust $\frac TW$, $CL_{to}$, density/reference density etc.). In ...
3
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1answer
999 views

What is radar minima?

I was studying the Aeronautical Chart User's Guide and I came across the term 'radar minima' several times under the graphics depicting charted airports. Blue – Airports with an Instrument Approach ...
7
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2answers
17k views

What is the difference between Cruise and Service ceilings?

I am looking at aircraft performance data. There are charts for "Cruise Ceiling" and "Service Ceiling." What is the difference? (The cruise altitude is lower.)