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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2
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1answer
145 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 ...
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3answers
313 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
316 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
98 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: ...
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2answers
136 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.
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6answers
178 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
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5answers
355 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 ...
5
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3answers
494 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
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1answer
90 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
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1answer
90 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
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2answers
150 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 ...
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2answers
119 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
126 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 ...
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2answers
110 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?
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2answers
140 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 ...
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 ...
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2answers
408 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 ...
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1answer
227 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?
1
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1answer
100 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...
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1answer
83 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 ...
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1answer
168 views

What is the meaning of AFT in airworthiness directives?

What is the meaning of AFT in airworthiness directives?
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1answer
96 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?
3
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1answer
77 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 <...
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1answer
145 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, ...
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6answers
3k 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 ...
16
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2answers
5k 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 ...
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1answer
1k 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?
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5answers
11k 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 ...
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2answers
985 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?
3
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2answers
163 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 ...
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1answer
146 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 ...
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2answers
333 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 ...
5
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1answer
4k 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 ...
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1answer
2k views

What is the difference between redundancy and fault tolerance?

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

Why is it common to speak of “Concorde” rather than “the Concorde”?

Suppose you researching a book on the history of Boeing B-17. Suppose you researching a book on the history of the Boeing B-17. Which of those sentences sounds more complete and correct? OK, so ...
27
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2answers
7k views

What is a rubber engine?

I hear it a lot in engine design , I think that belongs to some phase about we can change the engine parameters according to requirements but I am not sure about it.
2
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1answer
80 views

What do “azimuth window” and “compass switch” refer to in this accident report?

I recently read the accident report on BEA 548, but I'm unsure of some technical terms used on p. 4 of the report (p. 14 of the linked PDF): Apart from the probability that in the particular ...
13
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3answers
2k views

What does “out of trim” mean?

Our flight was delayed from takeoff because the captain reported it to be "out of trim". What does this mean?
10
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1answer
284 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 ...
0
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1answer
61 views

Is the National Aviation Authority the same as the Civil Aviation Authority?

Are the NAA (National aviation authority) and the CAA (Civil aviation authority) the same organisation? According Wikipedia it looks like they are the same organisation.
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1answer
2k views

What is the difference between microburst and windshear?

When I read about these weather phenomena, I find that both of them depict the same thing, and have the same actions to avoid. So why are they differentiated? http://www.myairlineflight.com/windshear....
5
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1answer
676 views

What is the meaning of HOT-1, HOT-2, CAM, etc., in cockpit voice recorder transcripts?

When reading the the written down recordings of CVR like here, for instance, it is common to see abbreviations like HOT-1, HOT-2 or CAM. I guess that CVR records multiple channels and the codes ...
3
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1answer
512 views

What are the fins near the tail of a helicopter called?

My young sons are very enthusiastic about helicopters and I am repeatedly asked to name parts of their model aircraft. I would like to do so correctly, but my research has not always given definitive ...
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1answer
63 views

How to call a cartesian (END) coordinate system, that is referenced in surrounding air?

I'm looking for the correct/usual terminology for a coordinate system, that is moving with the wind. I do calculations in a Cartesian East-North-Down (END) system. When taking wind into account I'd ...
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1answer
259 views

What are the radius of containment (Rc) and horizontal protection limit (HPL) and how are they related to Type Code?

In ICAO Document 9871 (Technical Provisions for Mode S Services and Extended Squitter) page 30 they have mentioned it in the form of a table. But they haven't explained HPL and Rc in detail.
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1answer
131 views

AN-hedral or Cath-hedral? [closed]

We normally hear of wing geometry with dihedral. Most commonly, when speaking of a wing with negative dihedral, we hear the term anhedral. As I recall the prefix "an" indicates "without". On a few ...
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3answers
1k 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 ...
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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 ...
13
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4answers
3k views

What is the official term for a gas / petrol station for planes?

I'm talking specifically about small airports where they don't have the fancy equipment and they actually have to go to a specific place to refuel for example cars go to gas station / petrol station ...
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1answer
261 views

What is a CRM and what does it stand for? [duplicate]

I've always wanted to ask a pilot what a CRM was. Of course, I didn't really get lots of chances to ask pilots, no I thought of just asking here. What is a CRM and what does it stand for?