What is the important step before making a cold-patch repair to a deicer boot?

The most important step before making a cold-patch repair to a deicer boot is to consult the manufacturer's service manual. This is essential because the service manual contains specific guidelines and procedures that are tailored for the particular aircraft and deicer boot in question. It provides critical information on the recommended materials, techniques, and safety precautions needed to ensure the repair is effective and does not negatively impact the performance or integrity of the deicer system.

Following the manufacturer's guidelines ensures that the repair adheres to the standards required by aviation authorities and mitigates any risks related to improper repair methods or incompatible materials. By referencing the service manual, technicians can ensure they use the correct type of cold-patch material and follow the necessary steps to prepare the deicer boot surface adequately for the repair.

While other steps, such as applying temporary sealants or warming the boot, may be relevant in specific contexts, they should be carried out in accordance with the steps outlined in the service manual. Making assumptions about the repair process without the manufacturer's instructions could lead to ineffective repairs or even failure of the deicer system during operation.