Which of the following are acceptable to use when utilizing chemical cleaning and/or depainting/stripping agents on aircraft?

1. Synthetic fiber wiping cloths when using a flammable agent.

2. Cotton fiber wiping cloths when using a flammable agent.

3. Atomizing spray equipment.

Question

Which of the following are acceptable to use when utilizing chemical cleaning and/or depainting/stripping agents on aircraft?

1. Synthetic fiber wiping cloths when using a flammable agent.

2. Cotton fiber wiping cloths when using a flammable agent.

3. Atomizing spray equipment.

BlackTom AI · Accepted Answer

Synthetic fibers can build and hold static charge, so they are generally not acceptable with flammable cleaning agents; natural cotton fibers dissipate static and are the preferred wiping material when using flammable solvents.

1) Relevant knowledge points and concepts
- Flammability and ignition: Flammable solvents produce vapors that can ignite from small ignition sources, including electrostatic discharge (ESD).
- Fiber properties: Synthetic (e.g., polyester, nylon) cloths are insulative and prone to static buildup; cotton is a natural, more conductive fiber that dissipates charge.
- Atomization and aerosol risk: Spraying or atomizing a flammable agent produces fine droplets and increases vapor concentration and surface area, greatly raising fire/explosion hazard.

2) Step-by-step reasoning
- Evaluate synthetic fiber cloths (statement 1): Using a flammable solvent on synthetic cloth can permit electrostatic charge to accumulate; a spark from ESD can ignite the solvent vapor—therefore unsafe.
- Evaluate cotton fiber cloths (statement 2): Cotton wicks solvent and does not readily generate static sparks, reducing ignition risk; regulatory guidance and maintenance best practices recommend cotton wiping cloths for flammable solvents—therefore acceptable.
- Evaluate atomizing spray equipment (statement 3): Atomizing converts solvent into a fine mist, creating a flammable aerosol that easily forms an ignitable mixture with air and can travel to ignition sources (flashback). Use of atomizing spray for flammable agents is not acceptable except under tightly controlled, certified conditions—generally prohibited in typical aircraft maintenance settings.

3) Intermediate considerations
- No numerical calculations apply, but hazard multiplication occurs: atomization increases exposed surface area and vapor concentration, increasing probability of ignition compared to wiping.

4) Why the correct answer is correct
- Cotton minimizing static discharge makes statement 2 acceptable with flammable agents, aligning with safety guidance.

5) Why other options are incorrect
- Statement 1 (synthetic cloths): Incorrect because synthetic fibers generate static and can ignite vapors.
- Statement 3 (atomizing spray): Incorrect because atomization raises flammability/explosion risk.

Conclusion: Only statement 2 is acceptable. This matches the provided correct answer: 2.

Which of the following are acceptable to use when utilizing chemical cleaning and/or depainting/stripping agents on aircraft? 1. Synthetic fiber wiping cloths when using a flammable agent. 2. Cotton fiber wiping cloths when using a flammable agent. 3. Atomizing spray equipment. 单项选择题

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