How does the type of aircraft skin (e.g., composite, aluminum) influence the choice of cleaning agents used during GSE maintenance?

The type of aircraft skin, whether composite or aluminum, significantly influences the choice of cleaning agents used during Ground Support Equipment (GSE) maintenance due to the different chemical sensitivities of these materials. Aluminum is susceptible to corrosion, particularly from alkaline or acidic cleaners. Strong alkaline cleaners can etch the aluminum surface, causing pitting and weakening the metal. Similarly, acidic cleaners can dissolve the aluminum oxide layer that protects the metal from further corrosion. Therefore, when cleaning GSE that comes into contact with aluminum aircraft skin, it's crucial to use pH-neutral cleaning agents. These cleaners are formulated to be gentle on aluminum and will not cause corrosion. Composite materials, such as carbon fiber reinforced polymer (CFRP), are generally more resistant to corrosion than aluminum. However, they can be damaged by solvents, such as acetone or MEK (methyl ethyl ketone), which can dissolve the resin matrix that holds the carbon fibers together. Using abrasive cleaners on composite surfaces can also scratch or damage the resin matrix, compromising the structural integrity of the material. When cleaning GSE that comes into contact with composite aircraft skin, it's important to use cleaning agents that are specifically approved for use on composite materials. These cleaners are typically water-based and free of harsh solvents or abrasives. Always consult the aircraft manufacturer's maintenance manual for specific recommendations on cleaning agents and procedures. The manual will provide guidance on the types of cleaners that are safe to use on the aircraft's skin and will also outline any specific precautions that should be taken. It's also important to consider the environmental impact of the cleaning agents. Choose environmentally friendly cleaners whenever possible to minimize pollution and protect the environment. Incorrect cleaning agents can cause structural damage, corrosion, and void warranties.