Questions tagged [feature-identification]

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

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8
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3answers
2k views

What is this device below the door of a 737 (and other aircraft)?

The other day I made a question about the External Power Hatch. Now I would want to know what's that hole below the door.
19
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1answer
11k views

What are these antenna-like protrusions for on an airliner?

This is a JetBlue A320: I've always wondered what these are for, but could never find the answer. I'm guessing a few of them are for receiving information from satellites.
59
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3answers
24k views

What are these things hanging off the trailing edge of the wing?

What are these things hanging off the trailing edge of the wing? I've seen them in almost all of the aircraft I've flown in, and can't remember if they're exclusively Boeing or Airbus.
16
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2answers
9k views

What exactly are those openings in the bellies of many jetliners?

I have circled the areas (in yellow) under the belly of the 737. What exactly are those? (airliners.net)
47
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3answers
29k views

What is this flange on the engine?

Flying home from the Denver ComiCon, on a 737, I saw an angled flange on the engine. Could you describe its purpose? Photos by CGCampbell licensed CC0
30
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1answer
27k views

Why is there a hole in one of the layer of an airplane's windows?

On a commercial airliner, there is a hole in one of the layer of the passenger windows. See here: and here: Or in more detail: Can you explain the physical reasons for this design choice?
32
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1answer
5k views

What does this black triangle placard on board an A320 denote?

Just out of interest whilst travelling aboard a British Airways A320-232 G-MIDT on the 9.45 BA shuttle service (LGW-GLA) in seat 10F I noticed a placard above the window of seat 9F. Given this seat ...
15
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1answer
1k views

What are the circles/holes ahead of the wing of an MD-82?

In the picture below I noticed there are three circles or holes of some kind ahead of the wing, what are those? (airliners.net)
239
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4answers
148k 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?
30
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1answer
6k views

What is this pattern on the windshield of aircraft?

The image is extracted from this Airbus A350 video (at 3m40s, when taking off) I circled in purple the strange pattern formed by few black straight lines. I'm quite puzzled as I have no idea of what ...
26
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1answer
2k views

What is this device they bring on board from the jet bridge when we park?

Every time I deplane a Virgin America A320, I notice that they grab something from the jet bridge, and stuff it between the jump seats. I haven't seen any other commercial airlines with things like ...
12
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1answer
6k views

What are these spinning discs next to the throttle of the Boeing P-8 Poseidon?

The source video can be found here and the GIF is from 0:21 onwards. What are those 2 spinning things next to the throttle ?
22
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2answers
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What is this 'ball' in front of the cockpit of some fighters, e.g., an Su-57?

What is the lump/ball thing visible below and to the left of the canopy in this image of a PAK FA (which became the Sukhoi Su-57), and what is it for? It's also seen on other fighters. Image source
17
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1answer
3k views

What is this device protruding from the rear of this 787?

While looking at the photos from this question I noticed a small protrusion from the side of the plane. You can see it in the photo: and in the diagram from l@aeroalias answer: In the diagram it ...
13
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1answer
3k views

What is the purpose of this helicopter fin antenna?

I'm an airplane guy, but I've got a quick helicopter question. I've seen a few helicopters with what seems to be a fin shaped antenna on the middle of the fuselage just above the windshield. I've also ...
19
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1answer
5k views

What is this device on the nose of a Bombardier Global 6000?

What is the circled object? (jetphotos.net)
47
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1answer
15k views

What is this hatch above the cockpit of a 747?

There is a little door on the upper deck above the cockpit: Source: Airliners.net, (modified to indicate location of hatch). What is that door? What is its purpose?
17
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2answers
5k 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
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1answer
1k views

What is this object on an MD-11?

There is something above the engine on the tail of this MD-11: What is that? Source
15
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4answers
6k views

What are these grilles in the passenger cabin of this 787?

Below the windows, ahead of the seat, there are small grilles. Look: Source: Airliners.net What are those for?
10
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1answer
5k views

What is the function of the protruding outlet on the Trent XWB?

Original by Bernd Sieker from Germany (Trent XWB) [CC BY-SA 2.0], via Wikimedia Commons Above is a photo of the Rolls-Royce Trent XWB highlighting the aft facing outlet in question. In a video for ...
10
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1answer
3k views

What are the protrusions on the sides of the fuselage of the F-16I?

I've noticed that the F-16I has these protrusions on the sides of its fuselage. What purpose do they serve?
24
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3answers
3k 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:
21
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1answer
2k views

Why did some Caravelles have a very long dorsal fin?

(Source) Why did some Sud Aviation Caravelles have a very long dorsal fin stretching half the fuselage? Initially I thought it's to keep the fin low to fit in existing hangars as a selling point, ...
13
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2answers
2k views

What are the flaps on the exhaust of military airplanes for?

I have been looking over some pictures of military airplanes, and I noticed that some of the more modern air planes have flaps on the exhaust I was wondering if anyone knew what the purpose of the ...
10
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1answer
1k views

What is the bend in the tip of the blade of the new Black Hawk?

The newer Black Hawks have this angle added to the end of their rotor blades. What is it for? How does it increase or decrease performance? Could this be used on airplane propellers? (...
8
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3answers
2k views

What are these holes in the engine inlet?

In the next picture can be seen within the housing, near the inlet:
5
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1answer
2k views

Can you identify this antenna on a Cessna 172N?

Does anybody know what this antenna is used for? I suspect a glideslope antenna but I am not totally sure.
5
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3answers
931 views

What is this tab above the DC-10's #2 engine? [duplicate]

What is this big rectangular tab (?) thingy extending backwards just above the DC-10's #2 engine? What does it do? (wikimedia.org, picture modified to point out the tab thingy)
2
votes
1answer
475 views

What is this square hole for? [duplicate]

When waiting to depart Edinburgh today I noticed a square hole (looked to be something that can be opened and closed) on the rear of the right side of the aircraft. Never seen it before and no idea ...
42
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2answers
11k views

What are these five indicators at the front of the 737 passenger cabin?

As a passenger I noticed a set of five indicators on the ceiling at the front of the 737 passenger cabin. They are red, yellow (or white), blue, white, red. The red ones seem to be coupled together (...
31
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2answers
22k views

What is this on top of the Air Force One?

Clarification: It wasn't Air Force One that visited Switzerland, it was the 747-200 E4 carrying Ashton Carter. Source What is this thing on top of the plane (In red circle): On other "Air Force One" ...
39
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1answer
7k views

Which aircraft had such a luxurious-looking navigator's station?

I'm reading the BBC's How Fiji changed the way we travel; The little Pacific island nation was the first to incorporate GPS into its aviation system – and in doing so forever changed the way we get ...
31
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1answer
4k views

What are these Lights on the Center Column between Cockpit Windows on the A320?

I have always noticed there is what appears to be three lights on the center column, which separates the pilot and copilot window of the Airbus A320 family. From the looks, the center light is red and ...
14
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1answer
2k views

What are the tube shaped structures on the back of the fuselage of this 737?

A previous question asked what the little metal plates between the horizontal and vertical stabilizer were (they are vortex generators), however I am much more interested in what the gray tube shaped ...
11
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1answer
879 views

What is the purpose of these movable panels on the MiG-35?

The MiG-35 has movable panels on the LERX (leading edge root extensions). There are a number of images around the web showing these panels deployed during slow flight and retracted otherwise. When do ...
46
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4answers
12k 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 ...
35
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1answer
16k views

What are those bumps on top of the Antonov-225?

What are those bumps on top of the Antonov-225? What are they for? And what are they called?
18
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2answers
6k views

What's this hole on the ATR-72?

There is a hole on the belly fairing circled in yellow. I guess is an air intake but I tried searching some info and couldn't find anything. Source
15
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1answer
3k views

What is that ceiling compartment of a Boeing 737?

Does somebody know what that big box in the roof of the 737 cabin is?
12
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1answer
1k views

Does the B-1B Lancer have controllable canards?

These three pictures shows the B-1B Lancer's canards and its elevators. I am not sure to call that feature a canard as the jet also has elevators. In my limited understanding, canard and elevator are ...
8
votes
1answer
585 views

What is the device at the tail of the F-16 Block 60?

The F-16 Block 60 has a lot of advancements, one of which is the device at the tail. What is it? For clarification, I believe all these vents (second image) are for said device.
4
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1answer
3k views

What is this flat plate sticking out of the tail of Learjet 24D?

What is this protrusion on the tail of Learjet 24D (shown just above the avro museum logo) and what is its function? Learjet 24D Tail closeup Zoomed out image of the Learjet tail Source: images ...
20
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2answers
5k views

What are those arrow markings on the wing?

I recently flew on a Boeing 737-800 and found these arrow markings on the wing. What are they for?
16
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1answer
9k views

What are these panels underneath the wing root of a A380?

What are these open panels underneath the wing root of a A380 (right above the person standing under the aircraft)? Are they ram air exhausts of the air conditioning packs?
15
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2answers
4k views

What is this plane and what are the rockets on the back used for?

While reading this question I saw an image of a plane marked as a US Marines plane of some sort with thrusters or rockets of some sort attached to the sides just past the CG. What plane is this and ...
15
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1answer
3k views

What is this pipe on the tail of this helicopter?

In this picture of a CH-53 you can see a pipe or rail on the tail section of the aircraft. What is that?
10
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1answer
2k views

What is this part of an aircraft (looks like a long thick pole sticking out of the back)?

On the website of Kenn Borek Air (an airline specializing in Arctic / Antarctic operations), on this page at the bottom, you can see the following picture: It looks like a long thick pole sticking ...
9
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2answers
2k views

What are these two tail elements of the Avro RJ100?

What are these two tail-side elements of British Aerospace Avro RJ100 and what is their function: Photo source: Eric Verplanken, jetphotos.net.
8
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1answer
2k views

What is the function of this fixed protrusion on the tail?

(wikimedia.org) Above you can see a small fixed (?) part on the Embraer 190, just above the KLM logo. It is on both sides of the tail. What is the function of this part?