Questions tagged [terminology]

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

Filter by
Sorted by
Tagged with
11
votes
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 ...
6
votes
0answers
147 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.
6
votes
3answers
1k 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.
12
votes
5answers
8k 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 ...
0
votes
2answers
801 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, ...
5
votes
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
votes
1answer
500 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
votes
3answers
28k 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
votes
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 (...
9
votes
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
votes
1answer
936 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
votes
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 "...
4
votes
2answers
3k 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
votes
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
votes
4answers
13k 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
votes
2answers
567 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
votes
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?
8
votes
2answers
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
votes
1answer
947 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
votes
0answers
632 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
votes
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
votes
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
votes
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
votes
1answer
840 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 ...
5
votes
2answers
14k 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.)
16
votes
3answers
7k views

Why is it called “Dry Thrust”?

When reading the specifications of a jet aircraft anywhere on the Internet, it usually states that its engine produces X pounds of "dry thrust". Why is it called "Dry" Thrust? As opposed to what?
8
votes
1answer
435 views

What is a “confidence maneuver”?

Order JO 7110.65T Section 6 Part 5-6-1 says Vector aircraft: a. In controlled airspace for separation, safety, noise abatement, operational advantage, confidence maneuver, or when a pilot ...
4
votes
1answer
431 views

What is the difference between a volume-limited-payload and a maximum-zero-fuel-weight-limited-payload?

Reading [Long Range Aircraft-AEA Requirements]. In appendix, Para 1.2 Definitions and specifications, the definition for "Payload" states Payload should be the Volume Limited Payload (...) or the ...
12
votes
3answers
19k views

What is the origin of the term “pax”?

Pax in commercial transport is used as something like persons or passengers, in the context of counting people, e.g. 150 pax onboard. (Amadeus capture, source) I observed that in German writers tend ...
8
votes
1answer
188 views

What is weight-climb speed?

I have a question about a document published by the Association of European Airliners. The name of the document is “Long Range Aircraft - AEA Requirements.” In the Appendix titled "Definitions and ...
11
votes
3answers
9k 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 ...
10
votes
3answers
13k views

What is the difference between a positioning flight and a ferry flight?

What's the difference (for the purpose) between positioning and ferry flight?
6
votes
1answer
992 views

What is the name for a flight crew that includes extra members for a longer flight?

For short haul flights, airlines fly with BASIC CREW. For long haul flights, the crew must be composed for another crew or "extra" crew members, less than a crew. What's the designation of the crew, ...
7
votes
3answers
657 views

What exactly does it mean, that plane has diverted due to the needs of a passenger?

Twitter account for Flightradar24 has reported twice in past 24 hours about two different British Airways flights that has diverted their original route "due to the needs of a passenger" (here and ...
1
vote
1answer
399 views

What is the aviation term for what the navy calls “fire control system”?

The weapons systems, including computers etc, in a naval ship can be referred to as the Fire Control System. I'm not sure if FCS would be considered an appropriate acronym for fire control; I'm using ...
6
votes
1answer
395 views

Why is this chart called a Short Field Effort Takeoff Ground Roll and not simply a Short Field Takeoff Ground Roll?

What does the word 'effort' mean in this context?
2
votes
4answers
27k views

What is the true meaning of the word “wilco” when used on the radio? What is its origin?

Pilots often learn to use the word "wilco" on the radio through contextual interpretation. During my experience as a pilot communicating on the radio I have often observed pilots using the word "wilco"...
10
votes
2answers
6k views

What is the true meaning of the word “roger” when used on the radio? What is its origin?

When pilots learn to talk on the radio they can generally learn that the word "roger," when used on the radio, is a way to acknowledge that a message was received. What is the textbook definition of ...
18
votes
2answers
13k 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?
1
vote
1answer
405 views

What is the meaning of segment in MTRs?

Military Training Routes (MTRs) with no segment above 1,500' AGL shall be identified by four number characters (IR1206/VR1207) MTRs that include one or more segments above 1,500' AGL shall be ...
7
votes
2answers
5k views

What's the difference between fog, fog banks, and fog patches?

My meteorology textbook (from Pooley's Air Pilot's Manual series) has a list of abbreviations used in met reports and forecasts. They include: FG for "fog" BCFG for "fog patches" PRFG for "fog banks" ...
22
votes
2answers
11k views

Why do we call it an apron?

Where did the term apron come from? Follow up question as suggested by @Pyritie.
19
votes
2answers
5k views

Why do we call it a ramp?

Airport ramps are close to level, not inclined. What is the history and etymology of this aviation term?
5
votes
2answers
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 ...
5
votes
2answers
2k views

Should people flying UAVs be called “Operators” or “Pilots”?

I'm wondering if there is any formal/official definition* pertaining to the title given to people controlling Unmanned Aerial Vehicles? Are they "more" correctly titled Operators or Pilots? *As set ...
6
votes
3answers
927 views

Jettison and Dump fuel - Do they have separate meanings?

According to the definitions, is there any difference between Jettison and Dump fuel? Does one of them use a different procedure, or they are simply synonyms?
1
vote
2answers
997 views

What's the technical name of the side window on Boeing and on Embraer?

On Airbus, the window beside the Captain and the First Officer has the technical name of SIDE WINDOW. What's the name on other aircraft, or they have the same specification?
4
votes
1answer
11k views

What is the difference between an air carrier and a commercial operator?

I am currently studying for my commercial and I've been seeing both of these terms used interchangeably. Is there a difference?
15
votes
4answers
40k views

What is the difference between a nacelle and a cowling?

I see these terms used almost interchangeably. To my understanding they both refer to the covering of an engine. Is there a technical difference between the two?
8
votes
4answers
11k views

What are the differences between air brakes, spoilers and lift dumpers?

So many people use these words interchangeably, but after a little searching on Google, I found they are not quite the same thing. All the links I read explain things in a misleading way which pushed ...