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Questions tagged [feature-identification]

For questions about identifying a feature or design on an aircraft or airport.

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5 votes
1 answer
2k views

What is this black teardrop-shaped object under the C-47 Skytrain cockpit?

I was recently at the Airborne Museum in Sainte-Mère-Église, France, and I saw a C-47 Skytrain for the first time in person. I saw that, under the cockpit, there was a black, teardrop-shaped object. I ...
10 votes
1 answer
157 views

Is there any version of CFM56 with can combustors?

This lamp is sold online: They claim it's made from a CFM56 combustion chamber. It looks like a can combustor, and I read everywhere that CFM56 uses an annular combustor. Is there a version of CFM56 ...
14 votes
2 answers
2k views

What are those things on the B747 engine pylons?

I noticed some dots and lines on the Boeing 747 engine pylons. What are they? The above image is as seen in this video at 2:18.
11 votes
1 answer
2k views

What are those little pieces for on the C27J?

Here is a picture I took. You can see some pieces on the vertical stabilizer, but only on one side. I imagine this is for an aerodynamic purpose, but I am not sure. What do you think about its purpose?...
9 votes
3 answers
3k views

Is there a specific purpose for the silver "swoosh" on Air Force One?

Air Force One, just ahead of where the wing joins, has a silver "swoosh" on the bottom of the fuselage: Air Force Two, or other congressional aircraft painted with the blue/white livery that I was ...
-2 votes
1 answer
167 views

What are these strakes on the belly of the F-16 for?

What are these 2 things doing under the F-16? Are they for aerodynamics? Source.
18 votes
3 answers
10k views

What is this little "rod" thing on the back of the F-22 for?

I was curious what this little extra surface on the back of the F-22 is for. I can't see any use of it protruding past the engine nozzles, so what is it for? Also, does the structure have any problems ...
17 votes
2 answers
4k views

What is this strake near the nose of the MD-80 for?

What is this for on the MD-80? Is it a stabilizer?
14 votes
2 answers
3k views

What engine are these fan blades from?

I bought these from a metal scrapper and paid about $30.00 total figuring they're worth more than that in cool factor. Problem is they aren't nearly as cool if I can't figure out what engine (and ...
1 vote
1 answer
197 views

PZL M28 Skytruck exhaust alignment

Watching a short documentary on PZL M28 Skytruck, I noticed it has quite oddly aligned exhaust pipes. They point almost directly downwards, with only slight aft tilt: Picture credit: Łukasz Golowanow ...
9 votes
1 answer
2k views

What is this display for on the Embraer E175?

Caught my attention, never had I seen a display in this kind of overhead position in an aircraft. What is it for?
5 votes
1 answer
1k views

What exactly are these two cones on top of this Sikorsky S-61 helicopter?

Haven't notice this thing on the Sikorsky, what is it? Another picture from another angle:
10 votes
1 answer
404 views

What are these "holes" in the F-104 for?

In this video there are two "holes" that I'm curious about. One is rectangular in the all white section of the plane that flutters open/close during flight. The other is somewhat oval and is ...
6 votes
1 answer
884 views

What are the bulges (with what look like air intakes) on the lower fuselage of the An-22?

On both side of the lower fuselage of the AN-22 there are long bulges. While the undercarriage doors are visible, they only account for a small proportion of the length, making me doubt they're just ...
3 votes
0 answers
132 views

What is the protruding element on the vertical tail of this Airbus Zero E concept?

The TurboFan concept of Airbus Zero E has a protruding element on the top of its vertical tail, see the image below. Image source Zoomed image Only this variant of the Zero E has it, is it related ...
4 votes
1 answer
190 views

What are these two sticks on chart holders?

Many different airplanes feature two small sticks on both sides of chart holders. These can be moved within a limited range. I've heard different versions about their use and haven't found any ...
6 votes
1 answer
289 views

What is this component below the fuselage of the Fokker F28 used for?

There is a long straight component with three attachment points below the fuselage of the Fokker F28 Fellowship: (image modified from Wikimedia) It looks like it is installed on both sides of the ...
13 votes
2 answers
2k views

What is this hole above the intake of engines of Mil helicopters?

Almost all the helicopters designed and manufactured by Mil have a hole above the intake. e.g. What is it for? APU? Other helicopters made by this company:
2 votes
0 answers
133 views

What is this thing sticking out under the F-22 Raptor's fuselage? [duplicate]

I was looking through some pictures I took of the Lockheed Martin F-22 Raptor performing a demo flight at Oshkosh 2023 and I noticed this thing sticking out from the bottom of the Raptor's fuselage. ...
7 votes
2 answers
2k views

What’s the purpose of the small “hole” in front of wing root on A320-214?

Someone knows what’s the purpose of this little “hole”?
3 votes
1 answer
263 views

Manual or other information regarding Kollsman Instruments B40331-10-276 altimeter

I just purchased a used altimeter from eBay because it'll look pretty on a shelf, and I may add a computer interface to it. However, I need help finding information on it. This (from what I've been ...
6 votes
1 answer
1k views

What is this tank on the wheel of a Westland Wessex HAS31B?

What is this tank on the wheel of a Westland Wessex HAS31B? I'm talking about the white tank on the left of the picture. Photo taken in Darwin aviation museum, own work, public domain.
5 votes
1 answer
517 views

Drain line under drag chute door of F-4 phantom

What is this drain line under the drag chute door on the F-4?
14 votes
1 answer
1k views

What is the metal plating on the back of the A-6 for?

What is the perforated metal plating on the back of the A-6/EA-6A for? Source: Wikipedia
10 votes
1 answer
5k views

Why is this screw on the wing of DASH-8 Q400 sticking out, is it safe?

Was flying with the Dash-8 Q400 and saw the screw sticking out? It's on the wing near the wheel compartment as shown in the picture. Even if safe, it doesn't look pleasant to the passenger. Are loose ...
5 votes
1 answer
2k views

What is this probe on the Airbus A330 engine nacelle?

What is the purpose of the little probe seen under the A330neo?
14 votes
2 answers
2k views

What are the reflective structures above and to the rear of the engines on a VC-25?

In this video at 7:04 we see the following view of a VC-25 (an aircraft frequently known as "Air Force One"): What are the two shiny, gold-coloured structures above and to the rear of the ...
9 votes
1 answer
780 views

Why is the forward fairing of the pylon very shiny and metallic in appearance in A350?

One can notice the forward fairing of pylon is very shiny and metallic. This is quite unique and I do not find it in other aircraft. Why is this? Does it serve any specific aerodynamic purpose or does ...
45 votes
4 answers
15k views

What is this hole at the front of the engine pylon on a Boeing 707?

Images of the Boeing 707 show a hole at the front of the engine pylon just above the engine. Can someone please tell me what is the purpose? Also why do images show the hole absent on the left outer ...
7 votes
1 answer
2k views

What is the purpose of the air inlets on an A320neo's pylon (LEAP-1A)?

What is the purpose of the air inlets on an A320neo's pylon (LEAP-1A)? Passive cooling, air bleed like in the 707, or something else?
5 votes
1 answer
208 views

What is this missile extended beneath an F-104 Starfighter?

On a video posted on YouTube there is a short clip of some sort of rocket-powered device - presumably a missile - extended beneath an F-104 on a mechanical sling. It must have been lowered into ...
2 votes
0 answers
75 views

What is this thing apparently attached to the bottom of this Caravelle's engine, and why is it there?

This Caravelle 10B appears to have something mounted on, or stuck to, the lower surface of its No. 2 engine nacelle. (Image originally by clipperarctic at Flickr, via Russavia at Wikimedia Commons; ...
7 votes
2 answers
2k views

What is this hole at the bottom of the DA40NG body?

This is the bottom of the fuselage of a DA40NG aircraft and where the right wing attaches to the fuselage. What is the thing I'm pointing at with the red arrow in the picture? As it is written in the ...
11 votes
3 answers
2k views

What is that missing instrument on a Beechcraft 1900C?

(Full image) Beechcraft 1900C. I cannot find the name of the missing instrument even in the manuals.
26 votes
3 answers
7k views

What is this part which is mounted on the wing of Embraer ERJ-145?

Take a look at the yellow parts which are mounted on the wing of an Embraer ERJ-145. What is it? Two closer images: From bottom:
3 votes
2 answers
1k views

Why does the F-4's rear seat have a weather scope eyepiece?

In the front seat. The pilot has a flat screen radar scope that shows both the planes and the weather. But on the rear seat. The weather scope has an giant eyepiece. Perhaps glare protection? (...
4 votes
1 answer
1k views

What is name of this part on a helicopter?

What is name of this highlighted part of helicopter and what is its use?
8 votes
2 answers
1k views

What is the purpose of the vertical splitter and the NACA duct at the MQ-9 Reaper engine scoop?

The engine scoop/intake on the MQ-9 features a vertical splitter at the inlet face, as well as another smaller NACA duct on the top cowl surface just aft of the inlet lip. I am guessing the former ...
4 votes
2 answers
728 views

What does this handle from the movie Flight (2012) do?

I wanted to ask about something that, as an aviation enthusiast I have never seen before, from the movie Flight with Denzel Washington. Perhaps the reason is is because it's a movie. You pull these ...
48 votes
1 answer
13k views

What does this plus (cross) sign on this electrical panel mean?

I'm looking at a picture of the electrical panel of a Phenom 100 and on it I see a + sign, does anyone have any ideas as to what it's supposed to mean?
1 vote
0 answers
87 views

What is this aircraft-like object at Sea-Tac Airport? [duplicate]

Looking at the Seattle-Tacoma International Airport on Google maps, I noticed at 47°27'47.8"N 122°18'15.5"W something that looks like a jet aircraft, but with folded wings and a tiny ...
248 votes
4 answers
154k views

What is the dark spot visible below the cockpit on A-10s?

On most A-10s I have seen, the area under the cockpit is darker than the rest of the plane. Is there a reason for this?
2 votes
1 answer
305 views

What is the purpose of this box behind the yoke on a 737?

I was looking at the 737 cockpit when I found this apparatus behind the yoke. I have never seen it before and I have no idea what is does. Can anyone help me?
0 votes
2 answers
379 views

What is this sheet on a Super Étendard?

What is this sheet on a Super Étendard ? As seen on
18 votes
2 answers
11k views

Are these two objects in cockpit of Antonov - AN 225 Mriya fans for air? What is their purpose?

In the above image, we can see two black objects that look like ceiling fans. This is just a reference image, but I am pretty sure that I have also seen small table fans mounted in cockpits of large ...
15 votes
1 answer
4k views

What are the two vents on the 777's left side behind the wing for?

— wikimedia.org; cropped Those have always caught my eye and I always dismissed them as equipment cooling vents. But, after finally remembering to check the flight manual, it turns out the equipment ...
6 votes
1 answer
2k views

What is this nose projection on the Tupolev Tu-95?

The Tupolev Tu-95 has this long and quite substantial appearing projection from it's nose just under the cockpit windscreen: What is this? I initially though this might be a cannon but being a heavy ...
6 votes
1 answer
435 views

What are those pylon looking things on the rear of this DC-8 wing?

(image source: airliners.net) What are those humps on the rear of the wing? Are they external fuel tanks?
2 votes
1 answer
287 views

Is this electrical socket found in aircraft?

I work for a a Public Utility in IT Asset Management, and we have been buying these auto air adapters (Dell's description) from Dell for our field workers. Each one comes with an adapter that goes ...
18 votes
2 answers
3k views

Why does this Strikemaster have a textured leading edge?

I was at Duxford recently, and spotted a Jet Provost Strikemaster that had a rough texture applied to a portion of the leading edge of the wing. Why was this applied?

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