Before installing fabric

1. pre-dope any structure where fabric will be attached

2. repair any damage to structure

3. dope-proof other structure that may come in contact with dope

4. all of the above

Question

Before installing fabric

1. pre-dope any structure where fabric will be attached

2. repair any damage to structure

3. dope-proof other structure that may come in contact with dope

4. all of the above

BlackTom AI · Accepted Answer

All three preparatory actions are required before installing fabric on an airframe: pre-dope the attachment areas, repair any structural damage, and dope‑proof nearby structure to prevent chemical attack. These steps ensure a sound, durable fabric covering.

1) Relevant knowledge points and concepts
- Doping: application of nitrate/butyrate dope to fabric and attachment points to shrink and seal the covering and to provide adhesion.  
- Pre-dope (or sizing) of attachment areas: a thin sealing/priming coat applied to structure where the fabric will be bonded or stitched to ensure proper adhesion and reduce solvent penetration.  
- Repair of structure: fabric transmits aerodynamic and load forces to the underlying structure; any damage (cracks, rot, corrosion, loose fittings) must be corrected to restore strength and provide a stable substrate.  
- Dope‑proofing (barrier coating): dope solvents can soften or attack certain paints, adhesives, or wood finishes; applying a resistant barrier (varnish, dope-proof paint) protects components that must not be penetrated by dope.

2) Step-by-step reasoning
- Inspect structure thoroughly for damage; note all areas where fabric will attach and any adjacent surfaces that may contact dope.  
- Repair any damaged members (replace rotten wood, tighten or replace fittings, correct corrosion) so the fabric will have a sound load path.  
- Pre-dope the attachment areas so the fabric adhesive/seam will bond reliably and the substrate will be sealed against solvent wicking.  
- Apply dope‑proof coatings on surfaces that will be exposed to dope but should not be softened or discolored.  
- Only after these steps should fabric be installed and doped.

3) Intermediate steps: inspection → repair → pre-dope attachment points → dope‑proof adjacent surfaces → install fabric → apply final coats.

4) Why the correct answer is correct
Each listed action addresses a distinct, essential risk: structural integrity, adhesion, and chemical compatibility. Omitting any one increases the chance of failure (detachment, hidden structural weakness, or solvent damage).

5) Why the other options are incorrect
- Option 1 only (pre-dope) neglects structural repairs and dope‑proofing.  
- Option 2 only (repair) neglects adhesion preparation and chemical protection.  
- Option 3 only (dope‑proof) neglects necessary repairs and sealing of attachment areas. Each alone is insufficient.

Conclusion: therefore the correct choice is 4 (all of the above), which matches the provided answer.

Before installing fabric 1. pre-dope any structure where fabric will be attached 2. repair any damage to structure 3. dope-proof other structure that may come in contact with dope 4. all of the above单项选择题

类似问题

After rib lacing is complete, finishing tape is placed over the rib lacing prior to the next coat of dope.

What is one requirement for using fabric to cover an aircraft?

When covering an aircraft with a Standard Airworthiness Certificate and Ceconite® polyester fabric, following which requirements is mandatory?

After rib lacing is complete, finishing tape is placed over the rib lacing prior to the next coat of dope.

Before installing fabric Pre-dope any structure where fabric will be attached repair any damage to structure dope-proof other structure that may come in contact with dope all of the above

Where is surface tape required? over sewn or cemented seams it's not required over rib lacing

What is an antitear strip a covering patch a strip under the fabric cover and the reinforcing tape a strip of the same fabric used to cover the aircraft, used to prevent fabric tearing or lace breaking

When lacing fabric to a wing rib, what is the spacing for the first stitch? (Note: the first stitch is considered from the leading edge.) half the required lace spacing for the rest of the rib two times the required lace spacing for the rest of the rib the same as the rest of the rib.

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