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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3
votes
1answer
114 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
336 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
102 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 ...
35
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3answers
64k 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". ...
1
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3answers
2k views

Definition of “Rotation Speed” vs “Lift Off Speed” vs “Fly Off Speed”

Is rotation speed and lift-off speed ever used interchangeably? (AMENDED Question) Is lift off speed and fly off speed the same? (See supplemental info below) I thought I clearly understood the ...
9
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2answers
1k views

Is an engine surge classed as an engine fire?

Sometimes flames come out from the exhaust due to bearing distress or turbine blade fracture. Can such flames/fire be considered an engine fire?
16
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2answers
18k views

What is the history of “Joker” and “Bingo” fuel terms?

Why do we use, in military aircraft, the words "Joker" and "Bingo" to indicate the fuel status of the aircraft? What is the history of these two terms?
5
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2answers
483 views

What qualifies as a “takeoff” and “landing” in currency requirements?

I just met my night-time currency requirements at KONT. Landing and taking off from a 12000 foot runway in a Cessna 152 got me to thinking (always dangerous, I know). There's more than enough room ...
-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?
4
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2answers
372 views

What is a “natural flight loop”?

I'm roughly (edit: very well) familiar with flight simulation, but recently I came across a new term. In this brochure (scroll to the second page) by Airbus about flight simulators, they talk about ...
2
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2answers
320 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 ...
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?
1
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2answers
183 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
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1answer
138 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 ...
2
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2answers
186 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 ...
20
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3answers
3k views

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 (...
15
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3answers
6k views

What's an “altitude engine”?

FAR 91.205(b)(8) says that you need a manifold pressure gauge for each "altitude engine", whatever that means. What's an "altitude" engine?
13
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1answer
1k views

Is GOCE a satellite or aircraft?

This vessel (GOCE) is in orbit and maneuvers by using air similar to a plane to create lift and turn. The solar powered ion thrusters powers it continuously inside the atmosphere for years. Is this ...
0
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1answer
235 views
1
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1answer
127 views

What's the difference between 'modification' and 'corrective action' in an AD or SB?

For example Modification of an airplane in accordance with the instructions of the specific SB as specified in Table 1 of this AD, as applicable...
0
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2answers
1k views

Why is there conflicting nomenclature for the 1,000 ft runway markings?

The two thick solid lines on runways at 1,000 ft from the end of the threshold are called "fixed-distance markers" in some documentation, and in others, it is called the "touchdown zone marker". Are ...
3
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2answers
1k views

What is the difference between a “compass swing” and “check swing” procedure?

What is the difference between a "compass swing" and a "check swing" procedure?
12
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6answers
4k views

What is Density Altitude?

I'm trying to get a deep understanding of the term: Density Altitude. So I have read the explanations in my instruction book, and online articles. One source explained it differently then the other ...
26
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2answers
103k views

What is the difference between centre of pressure, aerodynamic centre and neutral point?

I have just started learning some aerospace concepts, and I am not able to understand the difference between the three terms centre of pressure, aerodynamic centre and neutral point. What are their ...
4
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1answer
415 views

Do 'threshold' and 'end of the runway' mean the same thing?

While I studied aviation, I got confused by these two words. Can anybody explain whether they're the same or not, and if not, what is the difference?
0
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1answer
102 views

Can we use ECI coordinates for an airplane?

It is taught for navigation systems (like an airplane) on Earth we us ECEF (earth-centered, earth-fixed) and for space systems (like a satellite) we use ECI (earth-centered inertial). But why is ECEF ...
1
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1answer
100 views

What is the meaning of “regular pitch” when applied to a propeller?

I am looking at parameters of a propeller that looks like this: 3 blade xx inch diameter (regular pitch) What does "regular pitch" mean?
5
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1answer
7k views

Are QDM and QDR the same as 'inbound' and 'outbound' courses?

I'm about to take my last test to join an airline: the simulator. I've been told they ask to perform some QDR/QDM interceptions, as well as radial ones. About QDM/QDR: QDM: Magnetic course from the ...
6
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1answer
3k views

What is the difference between redundancy and fault tolerance?

What is the difference between redundancy and fault tolerance in the context of aviation ?
3
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1answer
100 views

Is the “PROB” in a TAF only applying to the next group or all following ones?

Let's assume I have a TAF that reads: [...] PROB40 TEMPO 0815/0822 5000 -SHSN BKN008 OVC015 TEMPO 0822/0909 1000 SN VV003 BECMG 0902/0904 16012KT Which of the <...
1
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1answer
203 views

What is the name for a flap that increases the wing's area but not its camber?

Flaps are high-lift devices mounted to the rear portion of an aircraft's wing. Some types of flaps increase lift by increasing the wing's camber, or, at least, that of its lower surface (plain flaps, ...
10
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2answers
751 views

Why do pilots refer to the Flight Service Stations as “Radio” in the the United States?

When using an aircraft radio to call a Flight Service Station ("FSS"), why do pilots refer to them as "radio?" I understand calling control towers "tower", ground control "ground", Air Route Traffic ...
7
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3answers
8k views

If the “Fuel Shutoff Valve” is ON, wouldn't fuel be cut off?

Ok, so this may be more of an english lanugage question, and I can confirm from context that when the fuel shutoff valve is ON fuel does indeed flow to the engine, but wouldn't that just make more ...
7
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2answers
404 views

What does “leave clear on its left” mean in UK regulations relating to collision avoidance on non-runway landings?

This doesn't seem to be plain English, could someone explain this with a simple example for me please? I'm not sure what 'Leave clear on it's left' means, and it's not clear whether the subject of the ...
4
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3answers
3k views

Is there a difference between a chart and map?

Does the use or meaning of "chart" or "map" vary worldwide? Is there a difference between a chart and map?
4
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2answers
307 views

What is the ICAO equivalent of a “point out”?

In FAA air traffic control, when we have an aircraft that is transitioning through someone else's airspace that we want to talk to we do a "point out": Point Out. A physical or automated action ...
12
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3answers
11k views

What is the difference between azimuth and heading?

What is the difference between azimuth and heading? I understand heading, track, radial, course and bearing but I don't know what azimuth is. I rarely hear it used. The Wikipedia definition is a ...
16
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2answers
6k views

What does it mean to “firewall” an aircraft engine?

I (think) I understand what a firewall is (at least, in a single engine aircraft where the engine is at the front of the fuselage), but what does it mean "to firewall" an aircraft's engines, as ...
3
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2answers
179 views

Why are waypoints not named uniquely?

Waypoint names are not unique. Why ? This is unnecessary (it would be possible to use unique names only). It introduces potential for confusion. So why are duplicate waypoint names permissible and ...
1
vote
1answer
2k views

What are ARTCC, RCO and FSS and what are differences?

I am confusing what ARTCC, RCO and FSS. and also what do they do? Do they control air traffic by communicating with pilots? Also, do they offer WX information in air born?
22
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5answers
14k views

What exactly do “captain”, “pilot”, “co-pilot” and “first officer” mean?

I know the co-pilot sits beside the pilot. But it's not clear for me, who is the captain and who is the first officer? And where they are sitting during the flight? Who is in right seat and who is in ...
3
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2answers
2k views

What is a “sidestep landing” in an instrument approach?

I have never seen a sidestep landing on an approach plate. What is a sidestep landing and when I can chose this approach?
1
vote
1answer
158 views

What is an “unsafe airline”? [closed]

Question: Is there any internationally accepted definition for what an "unsafe airline" is based on objective criteria (e.g. fatalities per million passengers) ? Or is there an international standard ...
8
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2answers
45k 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 ...
19
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2answers
16k views

What is the difference between a fix, a waypoint and an intersection?

It seems these terms are used interchangeably. Are they the same thing? Do they all refer to the points in space that are given 5-letter names?
6
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1answer
2k views

What are the components of a crew pairing?

I need to do some modeling for an FRMS system. By crew pairing I mean a sequence of flights that starts and ends at crew base. From my understanding, crew pairings are made of: Duty periods, which ...
2
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2answers
2k views

Why bother tracking TSN after an overhaul?

I've noticed that mechanics often like to keep track of "time-since-new" (TSN) on components that have already been overhauled. What would TSN matter when the component is tracked by TSO for ...
12
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3answers
12k views

What's the difference between racetrack and holding pattern?

Is there any difference between them or they are only synonymous?
5
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2answers
585 views

What does 'given rate' mean?

I was watching this video: At around 1:28 I heard the controller clear a plane to descend to a level "given rate". I was searching online but couldn't seem to find ...