Just to add to the above. On the NG
, Boeing likes to call them flap support fairings, though everybody calls them flap fairings, canoes or flap track fairings. They are made up of three parts, the fwd, aft and tailcone fairing. In the above picture you see all of the tailcone and about a foot of the aft fairing.
|Quoting Starlionblue (Reply 4):|
Most aircraft can despatch with one or more missing but there is a drag penalty since the "naked" mechanism is not very aerodynamic.
's have eight flap tracks numbered 1 through 8 aircraft left to right. 1 and 8 can dispatch with all three fairing sections or just the tailcone missing. 2,3,6 and 7 can dispatch with only the tailcone missing. 4 and 5 are in the wheel well/body fairing area and don't have fairings.
|Quoting HAWK21M (Reply 6):|
The Classic B737s had the outboard fairings with a retractable Landing light that did have some snags to the mechanism.
The Classics outboard flap fairings are also an integral part of the aft flap drive system, which may have looked good when it was designed, but in practice, not so much. IMO from a mechanics perspective, the flap design of the NG
was the single greatest improvement made over the classic.