The replacement of fabric on fabric-covered parts such as wings, fuselages, stabilizers, or control surfaces is considered to be a

Question

BlackTom AI · Accepted Answer

Replacement of fabric on fabric-covered parts is considered a minor repair unless the underlying structure is altered or repaired.

1. Relevant knowledge points and concepts
- The FAA distinguishes major versus minor repairs/alterations by whether the action could appreciably affect weight, balance, structural strength, performance, powerplant operation, flight characteristics, or other characteristics of the aircraft. 
- Major repairs/alterations generally require approved data and an FAA Form 337 (or equivalent) and more stringent approval. Minor repairs do not change the essential characteristics and are handled with routine maintenance entries and approvals by the certificated mechanic or repair station.
- Re-covering fabric is typically a cosmetic and protective operation that does not change the airframe’s structural members if performed without modifying ribs, spars, or attachments.

2. Step-by-step reasoning
- Step 1: Identify the work: removing and replacing fabric covering on wings, fuselage, stabilizers, or control surfaces.
- Step 2: Ask whether the work changes any structural member or affects performance/flight characteristics. Purely replacing the cover does not alter ribs, spars, joints, or control linkages.
- Step 3: Apply the regulatory/maintenance criterion: if the operation does not appreciably affect weight, balance, structural strength, performance, etc., it is a minor repair.
- Step 4: If during re-covering the underlying structure is repaired or altered (e.g., replacing a spar, rib, or hinge), then the action would affect structural strength and be classified as a major repair.

3. Intermediate steps / specifics
- No numerical calculations are required. The determination is based on whether structural members are altered. Example: removing and replacing fabric per approved methods = minor; replacing a damaged rib discovered under the fabric = major.

4. Why the correct answer is correct
- Because re-covering by itself changes only the surface covering, not the inherent structure or flight characteristics, it fits the definition of a minor repair. Only when underlying structure is repaired or altered does it become major.

5. Why other options are incorrect
- Option 2 (“minor unless the new cover is different in any way”) is incorrect because a different but approved covering material or color alone does not automatically make the job major; the key is structural effect, not minor differences in the cover.
- Option 3 (“major repair even though no other alteration”) is incorrect because classification as major requires an appreciable effect on structure, performance, etc.; mere replacement of fabric with no structural change does not meet that threshold.

6. Conclusion
- The correct classification is: minor repair unless the underlying structure is altered or repaired, which matches the provided answer.

The replacement of fabric on fabric-covered parts such as wings, fuselages, stabilizers, or control surfaces is considered to be a 单项选择题

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