T
These windows are
sometimes removed and
plugged, usually during
maintenance overhauls,
and can be distinguished
by the metal plug which
differs from the smooth metal in later
aircraft that were not originally fitted with
the windows.
Next Generation 737 blended winglet on a Westjet 737
Upgrade packages
Winglets
The 737 has four different winglet types: 737-200 Mini-winglet, 737 Classic/NG Blended
Winglet, 737 Split Scimitar Winglet, and 737 Max Advanced Technology Winglet. The
737-200 Mini-winglets are part of the Quiet Wing Corp modification kit that received
certification in 2005.
Blended winglets are in production on 737 NG aircraft and are available for retrofit on
737 Classic models. These winglets stand approximately 8 feet (2.4 m) tall and are
installed at the wing tips. They help to reduce fuel burn (by reducing vortex drag), engine
wear, and takeoff noise. Overall fuel efficiency improvement is up to five percent through
the reduction of lift-induced drag.
Split Scimitar winglets became available in 2014 for the 737-800, 737-900ER, BBJ2 and
BBJ3, and in 2015 for the 737-700, 737-900 and BBJ1. Split Scimitar winglets were
developed by Aviation Partners Inc. (API), the same Seattle based corporation that
developed the blended winglets; the Split Scimitar winglets produce up to a 5.5% fuel
savings per aircraft compared to 3.3% savings for the blended winglets. Southwest
Airlines flew their first flight of a 737-800 with Split Scimitar winglets on April 14, 2014.
The next generation 737, 737 Max, will feature an Advanced Technology (AT) Winglet that
is produced by Boeing. The Boeing AT Winglet resembles a cross between the Blended
Winglet and the Split Scimitar Winglet.
Boeing B737
June 2017
www.alliance-airways.net
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