Questions tagged [feature-identification]

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

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56
votes
3answers
20k 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.
30
votes
1answer
24k 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?
30
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1answer
3k 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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2answers
6k 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)
12
votes
1answer
2k 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 ?
227
votes
4answers
144k 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?
21
votes
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 ...
13
votes
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)
21
votes
2answers
6k views

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
15
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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 ...
46
votes
1answer
12k 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?
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
27
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1answer
4k views

What is this pattern on the A350 front window?

The image is extracted from this 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 it is or ...
9
votes
1answer
2k 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 ...
21
votes
1answer
1k 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, ...
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:
6
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3answers
963 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.
5
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3answers
461 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)
39
votes
2answers
7k views

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

As a passenger I noticed set of five indicators on ceiling at the front of the 737 passenger cabin. They are: red, yellow (or white), blue, white, red. Red ones seem to be coupled together (what ...
29
votes
2answers
17k 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
votes
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 ...
19
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2answers
4k 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?
18
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1answer
4k views

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

What is the circled object? (jetphotos.net)
15
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1answer
2k 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?
14
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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?
9
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2answers
3k 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?
6
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1answer
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.
1
vote
1answer
249 views

What is this feature on a Piaggio P.180? [duplicate]

(wikimedia.org) What is this feature on a Piaggio P.180? I believe it's called a dolphin tail, but why is it exactly there and what is it for and why don't all airplanes have this?
0
votes
0answers
106 views

What are these holes at the right front of the ATR72? [duplicate]

The ATR-72 has these 3 holes at the right front of the fuselage. They are marked as Captain, F/O and StandBy. It says do not obstruct, and the area inside the red lines must be smooth and clean. What ...