Time for a new 20 questions...

1st yes or no question?

Is it made of wood?

Nope.

2nd question?

Is it man made?

Yes it is.

3rd?

Does it have any moving parts?

No, not any more. (free clue!)

4th?

is it made of metal ?

A lot of it is, yes. (Free clue #2!)

5th?

Was it any time used for transport?
For the forum to think about:
If its made mostly of metal and it doesn't have moving parts anymore (so at some time it did have moving parts), I would assume 1 of 3 things its either broken/welded together or rusted together.
So maybe a relic on the bottom of the ocean,or something in a museum,maybe a historic clock that doesn't work any more etc
Just my initial thoughts.

is it over 100 years old?

Yes, it was used for transport. (5th)

It is not over 100 years old. (6th)

7th question?

does that mean the item itself is over 100 years old or that this specific type of transport is not over 100 years in use?

i suppose the Titanic would be too easy, and would have a lot of wood too?

Also on something so large there must be somthing that still moves, ie a door or hatch ...

Was it used for `flight`?

Lothar the "Titanic" was done not so long ago.

Does it lie on the bottom of the ocean?

(The item is less than 100 years oldandthis typeof item is less than 100 years old)

It was used in flight (7th)

It does not lie on the bottom of the ocean (8th)

9th question?

lies on the bottom of the ocean... lol.. well it "was" used in flight. The wright brothers did their thing about 1903 i think which makes that particular one over 100 years old. Balloons are a good alternative except they don't use a while lot of metal save for the gas burner and I'd consider it to have moving parts. No modern means of flight lacks moving parts but I supposed thats why mog said used in flight. It is probably a mechanism used to aid flight.

Probably not an instrument but for all we know it could be a lunch tray used on an air line in the 1930's.