Engineering
Human Factors in Designing an Airplane Cockpit Display
Quick fact
A well-designed cockpit display can cut a pilot's reaction time to a warning by nearly half, and the difference between a good and bad display layout has been linked to real accident causes—like the 1977 Tenerife disaster and the 1997 SilkAir crash, where display design and pilot confusion played a role.
Why this is interesting
You're in the cockpit of a modern airliner, and the screens are filled with numbers, symbols, and colors. How do pilots find the one critical piece of information in a split second when every millisecond counts?
Read the full explanation
Understanding Human Factors in Designing an Airplane Cockpit Display
Imagine you're driving a car and the dashboard has every gauge in random positions—you'd struggle to find your speed. Cockpit displays are the ultimate version of this challenge. Pilots perform multiple tasks simultaneously: flying, navigating, communicating, monitoring systems, and responding to emergencies. The display must present the most critical data in the pilot's central field of view, use clear symbols and colors, and avoid information overload. Human factors engineering brings in knowledge of human perception and cognition. For example, the human eye is more sensitive to certain colors, so red is reserved for warnings, amber for cautions, and green for normal operation. Displays also use spatial layout—like putting the attitude indicator in the center—because pilots naturally look there. The goal is to create a display that matches the pilot's mental model: the way they already think about the aircraft's state. The design process involves iterative testing with actual pilots. They are observed in simulators to see how quickly they find data, how often they make errors, and how they respond to failures. Designers use checklists like 'can the pilot read it at a glance?' and 'does it show the most important information first?' This ensures the interface works for humans, not just for the engineers who built it.
A deeper explanation
The underlying principle of cockpit display design is to reduce the cognitive work a pilot must do to get the information they need. This is achieved through a hierarchy of information: the most safety-critical data (like attitude and altitude) are always present and visually dominant. Secondary data (like engine parameters) are available but less prominent. This hierarchy is built on the concept of 'change detection'—the display should draw attention to what changed, not just what is static. Another key mechanism is 'coding'—using shape, color, and position to convey meaning. For example, a sharp red and black arc indicates a dangerous speed range on the airspeed indicator. The human visual system processes these pre-attentively, meaning we notice them without conscious effort. This is why warning lights and master warnings are placed in the pilot's central vision and flash to capture attention. Error prevention is also built into the design. For example, digital readouts that change too quickly are hard to read, so designers may use 'trend indicators' to show changes over time. Also, redundant displays—like having both a primary and backup attitude indicator—ensure that if one fails, the pilot still has the crucial information. The importance of these principles is underscored by accidents. In the 1977 Tenerife disaster, a combination of a poorly designed communication display and pilot confusion contributed to the deadliest aviation accident ever. Modern displays are designed to be 'intuitive,' meaning that a pilot should be able to quickly understand the aircraft's state without deep analysis. This reduces workload and frees up mental capacity for decision-making, which directly enhances safety. By aligning the display with human capabilities, engineers create a system that feels like an extension of the pilot's own senses.