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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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 ...
8
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3answers
1k views

What does it mean when autoland is fail passive / fail operational?

The below explanation is what I've got from the internet about fail passive and fail operational: Fail operational - Where you have 3 autopilots engaged, such that any single failure will result in ...
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2answers
205 views

What does “short parked” mean?

Recently, when flying (as a passenger of a regular flight) from Stockholm/Arlanda, there was quite a long bus ride from the gate to the aircraft, because the latter was "short parked", according to ...
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 ...
19
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1answer
6k views

What is the difference between fail-safe and fail-soft?

I have heard the following terms related to safe system design but I cannot really see a difference between fail-safe and fail-soft (graceful degradation). To get a common understanding I will just ...
1
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0answers
55 views

What does “representative sample engine” mean for an overhaul extension?

If the PT6 turbo prop engine is required for an extension for overhauling due to operational reasons, the manual has to be searched if the extension is feasible for the company. The company states ...
4
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1answer
146 views

What is “scintillation” and are “qualified pilots” aware of it?

This answer to Has great eyesight been necessary for astronomers? mentions Astronomer Jocelyn Bell Burnell's recounting of a likely first visual observation of a pulsar. This can be found for example ...
0
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1answer
101 views

Launch control equivalent while take-off

What is the proper term used when the plane is stopped and the engine is ramped up and after a certain thrust is reached, it suddenly starts off with a jerk.
1
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2answers
87 views

Does it make sense to say an aircraft has an attitude of 3° or that it has a flight position of 3°?

I am trying to translate an aircraft manual, and there is a diagram showing what the HUD would look like given a "posición de vuelo de 3°". The diagram is captioned in Spanish as "vuelo horizontal a ...
3
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1answer
169 views

What does it mean when an aircraft engine is de-paired?

What does it mean when an aircraft engine is de-paired? e.g. the PW1000g engines being de-paired because of issues in the LPT or the Rolls Royce Trent 1000 engines due to excessive corrosion on some ...
12
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2answers
2k views

What is the correct name for this ILS Indicator?

What is the correct terminology for the name of the aircraft instrument that looks like this?
2
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1answer
98 views

Are the “centerbody”, “fan hub frame”, and “intermediate case” all the same thing or separate parts?

I'm curious about the frames & cases at the front of an engine. I've seen OEMs call them the centerbody, fan hub frame, and intermediate case. Are these all the same thing or are these each a ...
1
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0answers
71 views

What is the difference between flight watch and home reserve?

Can anyone explain the difference between 'flight watch' and 'home reserve' with regards to flight and duty periods. This is in regards to a charter operation, where crew members are on standby at ...
4
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1answer
99 views

Is the “wing area” of a biplane the projected area or the total area?

When you specify the wing area of a biplane, do you specify the planform area (the projected area) or do you specify the effective area of both the wings?
0
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0answers
102 views

What does pre/post modification mean in Airbus MPD?

What is the difference between POST MOD (with partial mod i.e SXXXX) and PRE MOD (with partial mod) in the applicability column of an Airbus MPD (Maintenance Planning Document)?
3
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4answers
3k views

How does bank angle differ from roll angle with respect to stability in fixed-wing aircraft?

I would like a clarification on bank angle and how its different from roll angle with respect to to fixed wing aircraft. It is my understanding that the bank angle is a result of rotating the aircraft ...
3
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2answers
532 views

What is a “slender delta” wing?

I am curious about delta wings. I read some articles and found the term "slender delta". Please help me to understand this term.
5
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3answers
1k views

Does tailless means no tail at all?

When I was reading about the HAL Tejas I observed that it was described as a "tailless" plane. However I could see a tail in the picture. After careful reading I am assuming that being tailless means ...
6
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4answers
17k views

What is fly-by-wire?

What exactly does the term "fly-by-wire" mean? Where did it originate? I understand that it refers to control systems. If an aircraft is not fly-by-wire, what is it? That is, what are the alternatives?...
7
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1answer
2k views

In a Practice Forced Landing (PFL), what are Low Key and High Key and how are their locations determined?

Please explain what are "low key" and "high key" in practice forced landings? Are they any particular locations with respect to the airfield? Are they the same for every aircraft? Will they change ...
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.
1
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6answers
261 views

Why is a reduction in lift called 'drag'?

Induced drag is high pressure air 'leaking' to the upper part of the wing (low pressure zone) creating a vortex which means the area of the wing tip with the vortex can't create lift. Drag on the ...
20
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3answers
4k views

What does the term “tanker” mean when used in regards to a passenger airliner?

In a comment on this answer: Airlines will tanker fuel if it's substantially cheaper at another airport I've wondered what that term meant before, and now this comment leads me to think that ...
0
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4answers
183 views

Is falling a mode of flying? [closed]

I frequently observe people arguing (on this very web site) about the question if falling is a mode of flying or not. It appears to me that the majority of people have a strong opinion that it is not. ...
1
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3answers
173 views

Is “wingman” strictly a military term?

Does it have to be a potential combat situation for a pilot flying on another's wing to be called a wingman. If two aircraft are being flown in formation to a destination simply for the purpose of ...
2
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2answers
136 views

In the modern aviation context, is the word “supercharger” generally assumed to mean a gear-driven system rather than an exhaust-driven system?

In the modern aviation context, is the word "supercharger" generally assumed to mean a gear-driven system rather than an exhaust-driven system? At one time the word "supercharger" often was used to ...
0
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1answer
203 views

What is the difference between an aileron and a flap?

I have already been searching Google for the difference between an aileron and a flap, but I am not much satisfied, so now I am asking here on SE. What is the difference between an aileron and flap? ...
7
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4answers
1k views

Cockpit vs Flight Deck?

Is there a distinction between a cockpit and a flight deck on an aircraft, or are the terms interchangeable? Boeing refers to the flight deck The new Flight-Deck Displays and Airbus refers to the ...
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 ...
22
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3answers
3k views

Why is the “Dutch” roll called so?

Why is the "Dutch" roll called so? When did this name enter common usage, and what is its origin? Please cite sources if possible!
3
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1answer
143 views

What does “wraparound” mean in the context of flight controls?

In the references regarding the flight control (for example in F-16) I see the word "wraparound". For example "Rudder coil wraparound", "IBU pitch wraparound", "IBU lateral wraparound"or "AMUX bus ...
11
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2answers
1k views

Why are Krueger flaps called flaps and not slats?

I always thought that flaps are trailing edge high lift devices and slats are leading edge high lift devices. This is also confirmed by the accepted answer for What is the difference between flaps and ...
14
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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 ...
4
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2answers
457 views

Why are some Tomahawk missiles' nose duck-nose shaped?

Why there is a duck-like shape in this Tomahawk missile's nose? I see this shape in most Tomahawk images; however, not every Tomahawk's nose is shaped like this. If it is an aerodynamic feature, ...
0
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2answers
201 views

Is there a specific aviation term for suicide by pilot?

CFIT, controlled flight into terrain, refers to an aircraft being unintentionally flown into the ground. Is there any term specific for suicide by pilot? CFIT would not apply to that situation.
2
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2answers
150 views

Does “nose dive” have a technical aviation meaning?

I've usually heard the term 'nose dive' used in a metaphorical sense -- "Wow, your stock portfolio is really in a nose dive!" Does it have any legitimate aviation meaning? More specifically, is it ...
2
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1answer
167 views

What's the difference between a “flight line” and a “tarmac”?

I was at a conference where there was a discussion on ontology for assets. There were two classification trees, one for assets on the flight line and one for assets on the tarmac. What is the nuance ...
0
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3answers
353 views

What is the area between the taxiway and runway shown in the picture below?

Is this the Arresting area? I'm not too sure what you call this area
7
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1answer
332 views

Why do we commonly use a “/” in acronyms in aviation world?

In non-aviation world, separation between letters in acronyms is either nothing (e.g. URL) or a point (e.g. A.M.). But in the aviation world, the "/" is common (e.g. G/S, V/S). I'm puzzled as: some ...
2
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1answer
107 views

What date and time definition is used for the second leg of a flight?

Let's take flight BA0015, from London to Syndney, via Singapore. This is data from FlightStats. The first leg has this data: ...
8
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1answer
417 views

Does the definition of visibility take object size into account?

Overall, visibility is the distance at which objects may be discerned. Does this definition take into account the size of the objects? Obviously large objects can be seen from farther away than small ...
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2answers
148 views

What is the real difference between aerospace and aeronautical?

I see people using these two words interchangeably. But I feel there is a huge difference between the both.
3
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5answers
899 views

Is (L/D)max achieved at a specific speed or AOA?

I'm little bit confused about the (L/D)max. So I've read this blog: https://joeclarksblog.com/?p=4155 and the author shows this graph: So if I understand it ...
15
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7answers
4k views

What is it called when you roll without yawing or pitching?

My instructor made me do an exercise that consists of banking the sailplane left and right around 30 degrees without moving from the axis. I need to aim for a specific point, and start with the ...
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 ...
3
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1answer
110 views

Term to differentiate between a flight and a flight instance?

What's a term to differentiate between a flight schedule (QF 72) and a particular instance of that flight schedule (QF 72 departing on July 25)? For example, I might ask "Which flight are you taking"...
10
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1answer
326 views

In the United States, are ultralights legally considered aircraft?

I sometimes hear it stated that in the United States, ultralight vehicles are not legally considered to be aircraft. For example, Wikipedia used to state: In the United States ultralights are ...
2
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1answer
98 views

What does “Controlling Object” mean in FAA documentation?

I was examining FAA's legacy files, which contain information for various airspace elements, and I noticed that there is a field in the airport layout file called "Controlling Object", for both base ...
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 ...
34
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3answers
63k views

What is the difference between “flight level” and “altitude”?

I have seen references to "FL180" and "FL300", and I know that they stand for Flight Level 180 and Flight Level 300. I've also seen references to "an altitude of 18000ft" or "an altitude of 30000ft". ...