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2. United Airlines Flight 1175 - Wikipedia

   en.wikipedia.org/wiki/United_Airlines_Flight_1175

   The other fan blade, which was identified as fan blade No. 10 and was the adjacent trailing blade, was fractured across the airfoil about 24 inches (61 cm) above the fairings. Laboratory examination of fan blade No. 11 revealed a low cycle fatigue (LCF) fracture that originated on the interior cavity wall directly below the surface. [3]

3. Fan disk - Wikipedia

   en.wikipedia.org/wiki/Fan_disk

   Diagram of a fan disk Fan disk assembly diagram, showing one blade and attachment hardware Cross section of fan disk Failed fan disk recovered from the center engine of UAL 232. A fan disk is the central hub of a fan in a turbofan engine. Fan blades are attached to the fan disk, which is rotated by a shaft driven by a gas turbine. [1]

4. United Airlines Flight 328 - Wikipedia

   en.wikipedia.org/wiki/United_Airlines_Flight_328

   It was redesigned exclusively for the 777 with a larger 112-inch (280 cm) diameter fan section using 22 hollow-core fan blades. The PW4000-112 fan blade is a wide-chord airfoil made of a titanium alloy, about 40.5 inches (103 cm) long and about 22.25 inches (56.5 cm) wide at the blade tip. A PW4000-112 fan blade can weigh a maximum of 34.85 ...

5. Centrifugal fan - Wikipedia

   en.wikipedia.org/wiki/Centrifugal_fan

   Figure 1: Components of a centrifugal fan An external motor belt driven inline centrifugal fan discharging inline to the exterior of a building through a duct. Unlike non-inline/non-concentric impeller casing design with a cutoff blade above, the concentrically symetric cylinder casing and impeller geometry of inline type redirects the outflow around so that it is parallel to the inflow of gases.

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