Stator vanes are attached by which method?

• A. Dovetail
• B. Bolts
• C. Welds
• D. Clamps

Answer: (A)

Stator vanes must stay securely in place under high-temperature cycling and constant vibration, while still allowing individual vanes to be removed for inspection and maintenance. The dovetail attachment provides a positive, self-locking connection between the vane root and a matching pocket in the stator frame. The angled shoulders of the dovetail bite into the slot and resist radial and tangential movement, keeping the vane firmly located even under engine loads. At the same time, the geometry accommodates thermal expansion and contraction without inducing sharp stress concentrations at the vane root, which helps prevent cracking.

Bolts would introduce through-holes and potential loosening under vibration, creating maintenance and reliability concerns. Welds permanently fix the vane and make removal difficult, with risks from thermal cycling and inspection challenges. Clamps may not provide the robust retention needed in a high-vibration, high-heat environment. The dovetail design therefore offers the best combination of secure attachment, serviceability, and durability for stator vanes.