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
3k views

Unclear about how you can have high RPM but no power

I did see this question: Manifold pressure vs power vs rpm But I'm still a bit unclear about the following. I've only flown cherokee pa28s, so I might not have empirical knowledge of the following. I ...
7
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2answers
250 views

What is the difference between the series and parallel yaw-damper systems for the 707?

Some excerpts from the Pan Am 707 AOM indicate that the 707 can have one of two different yaw-damper systems, "series" and "parallel", with differing capabilities: YAW DAMPER The ...
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1answer
409 views

What is Automatic Radial Centering on a VOR indicator?

As the title says - some steam VOR indicators got an ARC indicator lamp. According to the POH of an aircraft featuring such a VOR indicator this means Automatic Radial Centering. What is that ? I ...
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3answers
346 views

What is the difference between "cruise" and "en-route"?

I have a little misunderstanding about the two concepts: Cruise and En-route. Could you guys help me to compare the similarities and differences between these two concepts, maybe in some aspect like ...
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3answers
286 views

What is the definition of Height Above Threshold (HAT)?

I could use some help settling a disagreement about the definition of HAT. So my company uses the word HAT to mean “height of the aircraft above TDZE…at any given distance…at any given time” So as an ...
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0answers
104 views

What is the difference between "origin date" and "departure date"?

In different sources e.g. OAG's API:s (Application Programming Interface), there are both (scheduled) "departure date" and "origin/origination date". In general (so not ...
4
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2answers
1k views

What does "time at temperature" mean in the maintenance manual of the J79 engine?

I was reading the maintenance manual of the General Electric J79 and saw these two charts: and What does "time at temperature" mean?
2
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1answer
249 views

What is the metal sheet in front of the engine called on a Cessna 182 or similar?

I need to know the name of that metal sheet covering the front of the engine in small Cessnas (specifically the Cessna 182), just behind the propeller. I mean the one where the cowl plugs are put into:...
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1answer
1k views

What does the term "Thru Pax" mean?

I am trying to find the meaning for a group of words used by professionals in the airline industry and this was one of them.
4
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1answer
249 views

Is there a name for the fast decline + pull to climb pattern?

I'm a hobby photographer and I've noticed some patterns in the bird flights, so I tried to poke a bit into the aviation terminology for it. Phalacrocorax carbo does this movement similar to the ...
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2answers
235 views

Pilots use of the term "with" then a letter when talking to ground [duplicate]

In ground comms when taxiing a pilot may say for example: "Kennedy ground, DELTA412 HEAVY, is in KILO-FOX, short of ALPHA with PAPA". I get that this means they waiting a KF exit of the ramp ...
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3answers
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What does the expression "Normally with hull loss" mean?

This is a question from a non-english speaking person. I encountered the expression "Normally with hull loss" in this safety categorization: (image source: EASA CS-25) Why is that not only &...
6
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1answer
529 views

Why is turbine inlet temperature called "TET"?

I assume that at some point giggling engineering students caused their instructor to change "turbine inlet temperature" from TIT to TET, but I wonder if anyone knows the real reason and ...
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0answers
80 views

What is inflated wind speed?

According to NOAA, inflated wind speed is "the true wind speed (in knots) adjusted to improve forecasts of higher wind speeds. Wind speeds greater than the mean wind speed observed are increased, ...
2
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2answers
87 views

How does the FAA define "Endorsement"?

I've looked in Part 61.1 and Part 1.1 (definitions), and looked for it in Advisory Circular 61-65H, "Certification: Pilots and Flight and Ground Instructors", and a definition of "...
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1answer
332 views

What is the origin of the following aviation slang terms?

I'm researching some aviation slang terms. I have difficulty in finding the origin of the following words and phrases. I would be grateful if you can help me. The words and the phrases and their ...
2
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1answer
200 views

What is an executive pilot?

I've been reading the transcripts from the July 17 and 18 1962 "Qualifications for Astronauts" hearings before the special subcommittee on the selection of astronauts that was organized to ...
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4answers
3k views

Why does NASA say $v^2$ is velocity squared rather than speed squared?

Lift and drag forces scale as the square of the relative flow speed, $v$. But speed is the magnitude of the velocity vector; that is, speed is the square root of the sum of the squared velocity ...
2
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2answers
162 views

In a jet engine, what is the significance of the stagnation pressure/temperature?

I'm reading a paper on jet engines that repeatedly mentions the stagnation pressure and temperature. What does this mean? Is it the point where the jet engine stalls in performance/efficiency/thrust, ...
2
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1answer
345 views

What is the difference between equilibrium and steady flight?

If I'm flying a regular Cessna 172 and its perfectly trimmed and flying in circles holding the same altitude, is the aircraft in equilibrium? Or steady flight? (The definition of equilibrium flight ...
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3answers
5k views

What is a "runaway supercharger"?

During World War 2, my uncle was a navigator for a B-17G bomber based in the UK. On return from a bombing run over Frankfurt, the crew was forced to bail out over Belgium at 3000 feet altitude. My ...
0
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1answer
99 views

What is "ACO transition"?

In MSFS2020, I frequently hear terms like "Cleared to ACO transition" and I can set an ACO in my flight plan. What exactly is an ACO and its obviously not a unique point because they seem ...
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1answer
89 views

What are RW values in Venule increments?

In US AIP differences from ICAO: 12.3.1.7 d/e/f U.S. controllers do not give wind speed, visibility, or RVR values in metric terms. RVR values are given in 100- or 200-foot increments while RW values ...
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1answer
507 views

What is the correct definition of "spanwise" and "chordwise" with a swept wing?

What is the correct definition of "spanwise" and "chordwise" with a swept wing? For example, in the context of "spanwise airflow" and "chordwise airflow"? a) ...
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2answers
533 views

What is “Weather and Chaff” information provided to pilots by ATC?

This one appears in an entry under "Additional Services" in the FAA Pilot/Controller Glossary and claims that ATC provides a wide range of additional services to pilots, including "...
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2answers
185 views

What is the full-form of ATA?

I was going through FCOM of A320 and came to know that FCOM chapters are called as ATAs. So first of all what is its full- form and secondly why do we call the chapters ATAs ?
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1answer
161 views

Fly a fixed wing single propeller airplane like a helicopter?

Has anyone tried to "helicopter" an airplane? And succeeded? And posted this video on the internet where I can find it? What I'm talking about with what I would call a "helicopter&...
0
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1answer
333 views

What is the difference between a service manual and a maintenance manual?

What is the difference between service manual and maintenance manual? Because sometimes I found one, sometimes I found another, the content is similar but not the same. What are the differences and ...
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2answers
367 views

What are differences between vortex, swirl, eddies and wake?

These terms seem to have the same meanings. Can anyone differentiate them?
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2answers
562 views

What does scheduled departure time exactly mean?

I am trying to understand the (sometimes subtle) differences between various terminologies concerning flight schedules. What I find difficult to understand is how exactly the scheduled departure time ...
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3answers
1k views

How are the wings of a mono- bi- or triplane referred to with regard to position?

Apologies if this is an elementary question. If I look at a diagram for parts of a plane, they don't distinguish verbally between left/right. If I try Googling for, say, "right wing" or &...
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2answers
143 views

Why are flight instructors in the US called CFIs?

I live in EASA-land (Europe), here we call our flight instructors simply that, "FIs". That they hold an instructors certificate is simply implied. Why are flight instructors in FAA-land (US) ...
2
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2answers
209 views

Is there a standard term for "3D groundspeed"?

Does the term "groundspeed" always refer only to the magnitude of the horizontal component of an aircraft's velocity vector with respect to the earth, or does it sometimes include the ...
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2answers
608 views

What, if any, would be the most correct term for the aerodynamic flight control surfaces of SpaceX's Starship?

SpaceX's Starship uses a unique flight control scheme during descent that I have not seen anywhere except with skydivers: it falls straight down belly-first using four aerodynamic control surfaces at ...
5
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2answers
425 views

What exactly do "attempt" and "cycle" mean in these starter duty limitations?

Can someone please explain me this A320 Starter Duty Limitation in simple terms? E.g. for the CFM56 Starter: No running engagement when N2>20% 4 cycles of max 2 mins Pause between start attempts . ...
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1answer
1k views

What is the origin of the "Pickle" switch for release of ordnance?

I am looking for proper proof of the theory that it is called so due to the Norden sight of the B17, which was said to assist the bomber in putting a bomb into a pickle jar, and hence it stuck.
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1answer
62 views

What classification of aerial vehicle would a manned quadcopter or octocopter be?

US here, if it makes a difference (w.r.t. FAA regulation, etc.). There's a new upcoming class of aerial vehicles, similar to drones, however they are gigantic and they are manned -- that is, manned (...
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2answers
53 views

Degree of motion terminology for special aviation movements

I perfectly understand yaw, pitch and roll. I'm wondering what a few special terms are for other unusual movements, such as those executed by a helicopter, drone or even perhaps something like a ...
7
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1answer
294 views

What use was there for Boeing to include customer numbers in their aircraft model names, and why did they end this practice?

Inspired by this question (thanks Hot Network Questions!). The tl;dr is that Boeing included a unique numeric model number designation, referring to the customer that had purchased a particular plane, ...
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2answers
3k views

Does a Boeing 747-830 exist and if it does, is there any difference to a 747-8 (748)

Two years ago I've uploaded a video of the Lufthansas Boeing 747 "D-ABYA" to Youtube. I am currently receiving some angry comments on that video because the title reads "747-830 with ...
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2answers
2k views

From an ATC perspective, what is an "arrival gate"?

I have seen reference to ATC assigned "arrival gates". As a passenger, an "arrival gate" is something like B12 or ...
3
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1answer
144 views

What is the difference between a spin and an uncontrolled roll in an high speed dive?

A comment I had on another (now deleted) question states that Air china 006 didn't spin. For me it was a spin (unwanted roll due to asymmetrical stall). The comment states it was "it was a slow ...
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2answers
1k views

What is the standard date format used in aviation?

As English is the standard language used in aviation and Zulu/UTC time is used as standard too or at least between pilots to calculate flight time and fuel. Is there any standard date format used in ...
2
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3answers
189 views

What is the correct term for the type of performance chart where curved lines are followed?

What is the correct term for the type of performance chart where, from a starting location, curved lines are followed to various reference points to eventually find a solution? For a specific example, ...
2
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2answers
616 views

What are the differences between "Off/On Time", "Total AC Time", and "Offset"?

Can somebody please help explain to me the difference between all of these. I understand that "Off/On time" is probably the Hobbs time which is determined by the time my battery master ...
2
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1answer
9k views

What does "running torque" mean?

I would like to know the meaning of the phrase and especially the meaning of "running torque": Torque the inner plug to between 75 and 85lbf.in. Loosen half a turn and RETORQUE to between 15 and ...
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3answers
4k views

What is the purpose of classifying fighters?

Fighters are classified by generation, as explained in this answer. Given this Wikipedia sum up, some fighters are not clearly in a defined generation, especially for 4th generation subclasses. Thus ...
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3answers
3k views

What does "Raven" [phonetic] means when used by ATC?

What is the meaning of "Raven" [phonetic] heard in use at Reagan National Airport? Most recently heard: The ATC will say "proceed direct raven" or "direct raven maintain" whatever altitude; or "...
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6answers
1k views

Is there a more specific term than 'flight line' for straight lines flown during flight?

I work for a small software startup, where its just my boss and I. Prior to this job, I had no experience with aircraft. We have a client that uses our software to fly a pattern over an area, where ...
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1answer
129 views

What does ''Reduced Coordination Airspace'' mean?

What does ''Reduced Coordination Airspace'' mean? There is a definition in here, page 4 bottom image.

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