What form must the engineering log be hand-written on?

The correct form for the engineering log to be hand-written on is 3120/2. This form is specifically designated for recording the detailed activities and operations of engineering personnel, which is essential for maintaining accurate records in gas turbine systems. Handwritten logs are important for ensuring that information is documented during operations, maintenance, and inspections, allowing for traceability and compliance with regulatory standards.

The other forms serve different purposes within the engineering documentation process, which is why they are not applicable for this specific task. For instance, the 3110/1 typically pertains to a different aspect of documentation within the engineering field, potentially dealing with maintenance requests or similar activities, and the 3120/1 and 3120/3 may address other log or reporting requirements not specifically suited for the engineering log. Thus, 3120/2 is the correct choice for maintaining an accurate engineering log.