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Questions tagged [feature-identification]

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

12
votes
1answer
574 views

What is this “Micro T-tail” on the F-102?

I just noticed this unusual thing on the F-102 Delta Dagger. It looks like a micro T-tail. What is it actually, and what is its purpose?
21
votes
1answer
976 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, ...
5
votes
1answer
387 views

KC-130: What are the four tanks/tube on the wings in between the engines used for?

On the KC-130, what are the 4 tanks/tube on the wings in between the engines used for? I've seen them in photos but without explanation. I cannot find any mention of them whatsoever. If not storage ...
1
vote
1answer
821 views

What is the purpose of a small wing near the cockpit on the front of some planes?

I saw a plane leaving Luton Airport that I have never seen before. It seemed to have an extra small rectangular wing near the front of the plane. What is it?
28
votes
1answer
2k 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 ...
40
votes
1answer
2k views

Can experts identify the model using this part (FOD prevention purposes)?

We found this part of an aircraft recently and, in order to improve the safety levels at our airport, we would like to know what possible aircraft model (or models) are compatible with this cover so ...
0
votes
0answers
87 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 ...
5
votes
1answer
628 views

What are these teardrop shaped thingamabobs on the bottom of the Panavia Tornado?

What are these two teardrop shaped thingamabobs on the bottom of the Panavia tornado? They could be hardpoints but I haven't found any photos where anything would have been mounted there. They don't ...
3
votes
1answer
575 views

What are the “panels” on the wingtips of the Panavia Tornado?

I am wondering about the purpose of the panel marked with the number 156 in this picture: The same black panel can be seen on the wingtips here: And also here: What purpose does this panel serve? ...
5
votes
2answers
422 views

What is the round thing on the tip of an MD-90 wing?

I like to pretend I know about airplanes, but have always wondered what the round things on the tip of MD-90 wings are. Here is an image of what I am talking about: To be clear, my question is what ...
38
votes
2answers
6k 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 ...
15
votes
2answers
781 views

What is this nose cowl mounted display?

(YouTube) A crop duster's nose mounted display. It looks like a poor man's HUD to keep the display and the outside view at roughly the same focus distance, but what is its function?
1
vote
0answers
140 views

What is this “hole” in the A350 fuselage? [duplicate]

As usual, I was looking at pictures of planes flying around me. And then I noticed a weird hole in this Singapore Airlines A350 fuselage: Source Registration number of this plane is 9V-SMD. ...
11
votes
2answers
3k views

What is this on the starboard engine of the Dash 8?

On the inside of the starboard engine of the Bombardier Dash 8 Q400 there is a small aerofoil shaped object* protruding from the casing. There also appears to be pipes protruding from the end of it. ...
12
votes
4answers
3k views

What is this ring-shaped device behind this DC-8's jet engine?

What is this ring-shaped device behind this Douglas DC-8's jet engine? (YouTube)
-1
votes
2answers
212 views

What are these vertical slats under the wings of the Be-200? [duplicate]

This is a photo of the Be-200, an amphibious aircraft, taking from a youtube video. I would like to know what are all those vertical slats underneath the wings? What is their purpose? To me they seem ...
3
votes
1answer
387 views

What is this in the window? [duplicate]

Every time I have flown and sat in a window seat, I have noticed this small tube at the base of the window. It looks like it might be either metal or a small air pocket, but I'm not sure. I've been ...
8
votes
1answer
2k 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 ...
7
votes
2answers
2k views

What is the crank on the ceiling of this aircraft?

What is the crank the pilot is operating above his head? Also what type of aircraft is this? image source
21
votes
2answers
5k 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
6
votes
1answer
1k 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.
3
votes
1answer
630 views

What are these diagonal devices above the leading edge of the V-22 Osprey's wing?

The Osprey has some kind of aerodynamic devices sticking up along the top of the leading edge. This picture from the Wikipedia page of the wings rotated shows them against its silhouette:- Public ...
8
votes
1answer
1k views

What is this display on the 737 Classic?

Source: YouTube I noticed that display (yellow circle) between the two CDUs. What is it for? It is not a default installation on the 737-3/4/500. It looks like a Navigation Display/MFD, but why have ...
14
votes
1answer
1k 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.
9
votes
2answers
2k 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?
44
votes
1answer
11k 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?
13
votes
1answer
895 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
2
votes
1answer
2k views

What is this protrusion on the door?

There's something below the door on almost every commercial aircraft. What is inside that box? The protrusion can be seen from the interior of the aircraft. Source
5
votes
1answer
1k views

What is this metal plate below the door?

What is this metal plate for? (source) You can also see it here: (source) Is found on many aircraft so what is that piece of metal right there?
6
votes
3answers
855 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.
18
votes
2answers
5k 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
29
votes
2answers
15k 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" ...
13
votes
1answer
918 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)
15
votes
1answer
2k 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 ...
5
votes
3answers
1k views

What are these holes in the engine inlet?

In the next picture can be seen within the housing, near the inlet:
21
votes
1answer
1k 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
2answers
2k views

What is this thing between the engines on the F-14 Tomcat?

On the F-14 as you can see from a picture there is some exhaust like thing in between engines. What is this?
9
votes
1answer
999 views

What are these parts on STOL/bush planes?

I've seen these (note the parts pointed to by the red arrows in the image) on the landing gear struts of Super Cubs and plenty of other STOL bush planes with large tundra tires. It looks like maybe ...
8
votes
1answer
1k 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 ...
29
votes
2answers
3k views

What are these boxes built into the tails of some fighters?

In looking at European-designed fighters of the 4th and 4.5th generation, I keep seeing a common design feature; a box-like structure built into the tail, often in the top half or third. Some examples:...
27
votes
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 ...
15
votes
2answers
5k 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)
3
votes
2answers
1k views

What is the use of saw-teeth present on the nacelle outlets of modern turbofans? [duplicate]

I've noticed that there are saw-teeth on modern jet engines such as the GEnx and the Rolls Royce Trent 1000. What is their purpose?
10
votes
1answer
799 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-6 for? Source: Wikipedia
55
votes
3answers
17k 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.
27
votes
1answer
23k 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?
218
votes
4answers
140k 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?