Do you know and understand the color coding of a hydraulic system on an aircraft?
Hydraulic systems are an integral part of the mechanics of a large aircraft because hydraulics control the movement of key pieces of equipment like landing gear, brakes, flaps, and other controls. Your interviewer will be looking to hear that you have a basic understanding of the standardized color coding of pressures and flows that has been established across all industries. Prior to your interview, hopefully you have a good working knowledge of the coding system that you can bring to Air New Zealand. If you don't, be sure to research and be able to talk about it knowledgeably during the interview.
"Having worked closely with hydraulic systems throughout my career, I am very familiar with the coloring system that determines fluid states. Green is the intake fluid, red indicates pressurized fluid, and blue indicates minimal pressure that is typically in a return line. While less common, I am aware of the states of white, purple, yellow, and orange as well."