Well, in this case quite a few. But that is not because they were changing a light bulb, but the entire light itself. And their efforts will do a lot to reduce emissions on the latest upgrade to the Boeing 737 family.
Boeing first flew the 737 in 1968. Since then the aircraft has become the most common in the world, with over 8,000 being sold. But the aircraft you see today is a lot different to the one flown in the late 60's. In particular, Boeing started flying their 737 Next Generation (NG) series in 1998.
And with a flight test carried out this week, the 737's that will be rolling off the production line from 2011 will be even more advanced. Specifically, the new generation of 737NG will save even more fuel (and CO2 emissions) than those operating today. In fact, around 7% more fuel efficient than those 737NGs introduced in 1998.
Aerodynamic and engine changes included in the efficiency package will reduce fuel consumption by 2%. One percent of the savings comes from reducing resistance as air flows around the aircraft. The upper and lower anti-collision lights change from round to a more aerodynamic, elongated teardrop shape. Wheel-well fairings are re-contoured to smooth the air flow near the main landing gear. A redesign of the environmental control system, exhaust vent and streamlined wing slat and spoiler trailing edges round out the aerodynamic changes.
Engine maker CFM is introducing an engine enhancement programme to coincide with the changes to the 737's airframe. Low- and high-pressure turbine modifications will result in a 1% reduction in fuel consumption.
You can see some of the work being done to increase efficiency on the new 737 in the video below, and perhaps understand why it takes so many people to change a light!
Fonte: Enviro Aero
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