Reference

Carbon Block

• Does the AA-3026 need to be fitted at installation?

  Yes. It comes with material stock so you can bring side clearance to your beta ring within the maintenance manual range of 0.001 to 0.010 in.

• How do I fit a new carbon block to the beta ring?

  Remove material evenly from the side faces of the carbon block on a flat reference surface until side clearance to the beta ring is between 0.001 and 0.010 in., per the Pilatus maintenance manual.

• What are the signs of a worn PC-12 carbon block?

  Side clearance to the beta ring greater than 0.010 in., visible wear on the side faces, chipping or cracking, or a block that binds or won't rotate freely in the reversing lever.

• What comes in the AA-3074 assembly

  The complete assembly: the AA-3026 block assembly (carbon block and stainless bracket), the AA-3025 yoke assembly, an MS20392-2C53 clevis pin, and a cotter pin.

• When should I replace just the block assembly instead of the full carbon block assembly?

  When the yoke assembly, pins, and attach hardware are serviceable and only the carbon face is worn.

• Will my new carbon block need to be sanded?

  Possibly. The carbon block can be sanded as necessary to bring side clearance to the beta ring within the range specified in the Pilatus maintenance manual.