When and how is finishing tape applied on a fabric covered aircraft?

Question

BlackTom AI · Accepted Answer

Finishing tape is doped on after the first or second coat of dope.

1) Relevant knowledge points and concepts
- Fabric-covered aircraft are treated with dope to seal, tighten, and provide a base for finishes. Dope (nitrate or butyrate) shrinks the fabric and bonds it to structure.
- Finishing (seam) tape is a narrow fabric strip applied over seams, lacing, and stitched areas to provide a smooth, airtight, and protective surface.
- Proper adhesion and wrinkle-free results require the fabric to have undergone initial shrinking and sealing before tape application, and the tape itself must be bonded with dope so it becomes integral with the fabric surface.

2) Step-by-step reasoning process
- After the fabric is attached and any seams or rib stitches are completed, initial coats of dope are applied. These first coats remove slack by shrinking the fabric and seal thread and fabric fibers.
- If finishing tape were applied before these initial coats, the tape would shrink differently or trap slack, causing wrinkles, lift, or poor adhesion as the fabric subsequently shrinks.
- Applying the tape after the first or second coat means the underlying fabric is already tensioned and sealed, so the tape conforms smoothly and bonds effectively when doped in place.
- Once the tape is set with dope, additional coats (primer/finish coats) are applied to build film thickness and finish the surface.

3) Application intermediate steps shown
- Apply 1–2 coats of dope to original fabric and allow to cure.
- Position finishing tape over seam; brush or flow a coat of dope to tack and wet the tape into place.
- Smooth out wrinkles; let dry.
- Apply subsequent coats (primer and finish) over the taped area to complete the finish.

4) Why the correct answer is correct
- The sequence ensures the tape bonds to a stable, shrunk fabric and becomes part of the doped skin, preventing lifting, air leaks, and surface irregularities.

5) Why the other options are incorrect
- "Sewed or laced on before dope is applied." Sewing/lacing of fabric panels is done earlier, but finishing tape itself is not merely sewn on before any dope; applying tape too early leads to poor conformity and adhesion.
- "Doped on immediately prior to the finish coat." Waiting until immediately before the final coat means the underlying fabric may not be sufficiently shrunk/sealed; standard practice is after the first or second coat so there is time for the tape to cure and for additional coats to produce a uniform finish.

6) Conclusion
Therefore, finishing tape should be doped on after the first or second coat of dope, which matches the provided correct answer.

When and how is finishing tape applied on a fabric covered aircraft? 单项选择题

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