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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22
votes
6answers
4k views

What does “Ground loops are costly. Fly them until they stop” mean?

In one of the earliest scenes of William A. Wellman's 1942 film Thunder Birds, a sign can be seen in a room of a USAAF base (some relax or briefing room, apparently), which says: Ground loops are ...
10
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2answers
4k views

What is the piece that covers the top part of tires?

I would like to know the name and the usefulness of this piece that covers the top of the tire of some planes, such as some Cessnas.
3
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1answer
169 views

What is the term for an aileron that’s also used as a ground spoiler?

Ailerons and spoilers1 have a considerable amount in common; both are wing-mounted panels, hinged at their leading edges, that move up and/or down to alter the aircraft’s aerodynamic characteristics. ...
8
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4answers
2k views

What exactly is a “coordinated” turn?

I am wondering what turn coordination really means and what makes a turn uncoordinated? I know that when the turn is coordinated, there is no slip and skid, an aircraft is flying a perfect circle ...
0
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1answer
59 views

What is the meaning of “transition area” as used by the FAA? Has the meaning changed over time since the term was introduced?

What is the meaning of "transition area" as used by the FAA? Does it currently have a specific meaning? Does the FAA still use the term at all? Has the meaning changed over time since the term was ...
23
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1answer
14k views

What does “Boeing” mean?

We know about the existence of Boeing planes like the 737, 747, and other planes. But where did the name "Boeing" come from?
1
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1answer
109 views

Does the phrase “.78/280/250” have a standard meaning to an airline pilot, in the context of a long descent?

Does the phrase ".78/280/250" have a standard meaning to an airline pilot, in the context of a long descent? Specific context-- the table in this answer-- Is the descent performance of the PMDG 737-...
13
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1answer
770 views

What is an airliner's “green dot speed”, and how does it vary with weight, and why?

A related question told us, quoting from an Airbus performance manual, Green dot speed (minimum gradient) is a function of weight. Comments under the question stated that the "green dot speed" ...
1
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2answers
116 views

How do STOVL and V/STOL aircraft differ?

Wikipedia's page for STOVL begins with A short take-off and vertical landing aircraft (STOVL aircraft) is a fixed-wing aircraft that is able to take off from a short runway (or take off vertically ...
11
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4answers
4k views

What is an aircraft magneto?

I know that magnetos are related to the engine and that on many planes, they are used to start the engine. But what exactly do they do in the engine?
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2answers
81 views

“Gross” and “net” planned runway length for the Haifa airport

My city's mayor was just boasting on how she'd gotten an approval for an airport runway of length "2100 m gross, 1900 m net length", and that this would be enough to connect the city - Haifa - to hubs ...
1
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2answers
105 views

What is the difference between Review and Analysis in DO-178C?

In the context of DO-178C, what is the difference between review and analysis of the outputs of the software development processes? Are they both the same?
25
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7answers
7k views

At what point does an aircraft become an airliner?

For me, the term 'airliner' conjures up an image of a passenger jet that is capable of hosting a large number of passengers¹ but I'm finding it difficult to source a reputable definition or etymology ...
0
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3answers
272 views

What's the meaning of “the break is a level” in a recovery operation of an aircraft carrier?

The break is a level, 180° turn made at 800 feet (240 m), descending to 600 feet (180 m) when established downwind. Landing gear/flaps are lowered, and landing checks are completed. (source: wikimili....
1
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3answers
195 views

What is “company compensation fuel” and “pad fuel”?

I tried to find the definition of these fuels but I could't. Does anyone know about company compensation fuel or pad fuel? In which document can I find the definition of these fuels?
2
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1answer
173 views

What does “mission mixing” mean for long-range aircraft?

I know very little, like long-range aircraft will be used for short-range and medium-range operations. But what is the purpose of using them like that? Also I want to get complete details of "mission ...
8
votes
3answers
2k 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 ...
1
vote
2answers
244 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 ...
1
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0answers
57 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 ...
5
votes
1answer
159 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
103 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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3answers
122 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
votes
1answer
192 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 ...
1
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0answers
72 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 ...
2
votes
1answer
110 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 ...
0
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4answers
201 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
178 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
votes
2answers
144 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 ...
4
votes
1answer
114 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
votes
1answer
553 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? ...
0
votes
1answer
200 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
votes
1answer
165 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
2k 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 ...
0
votes
2answers
210 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
155 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
votes
1answer
189 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
372 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
votes
1answer
343 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
votes
1answer
119 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: ...
1
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2answers
155 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.
2
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7answers
350 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 ...
3
votes
5answers
1k 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 ...
7
votes
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 ...
3
votes
1answer
122 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"...
2
votes
1answer
105 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 ...
2
votes
2answers
441 views

What is the difference between an engine “shut down”, “cut-off” and “cut down”?

Explain please for non-native speakers the difference between these engine (jet or piston) terms: shut down cut-off cut down I'm studying at a civil aviation university to become a pilot and a ...
1
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2answers
198 views

What exactly rotates along the lateral axis? Is 'rotate' mathematically correct?

Researching the etymology of 'rotate' (that OED lacks!), I chanced on Anas Maaz's Quora answer: What many does not know is 'rotate' is just not a fancy word, but it involves a real physical ...
2
votes
1answer
142 views

What is an “aeronautically qualified witness”?

Many older NTSB AARs, in their history-of-flight-and/or-accident-sequence sections, make mention of observations by an “aeronautically qualified witness” or witnesses, without any further explanation ...
-1
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2answers
114 views

How can we define that an Engine or Airplane is ETOPS compliance?

What is the process for obtaining ETOPS certification for an engine or aircraft?
2
votes
2answers
214 views

What do compressor/turbine stages mean, and why we need a different number of stages?

I am new to aviation. I realize that LP (Low Pressure) and HP (High Pressure) compressors/turbines have a various number of stages. What do stages mean? What is the reason to have a different number ...

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