Which indicator shows that a Delta One seat is upright and locked during TTL?

Which indicator shows that a Delta One seat is upright and locked during TTL?

• A. Red indicator light
• B. Blue indicator light
• C. Green TTL light
• D. Amber indicator light

Answer: (C)

The key idea is that Delta One seats use color-coded lights to show different posture and lock statuses. The green TTL light specifically confirms the seat is upright and locked during TTL. When you see that green light, the seatback is fully raised, the locking mechanism is engaged, and the seat is in the proper configuration for the TTL phase. The other colors signal other states: red typically warns that the seat isn’t locked or is unsafe, amber usually indicates a caution or intermediate state, and blue denotes a different seat function rather than the upright-and-locked condition. In practice, crew use the green TTL light as the quick, clear signal that the seat is ready for that phase, and if it isn’t illuminated, the seat should be adjusted and re-locked until the green indicator appears.

The key idea is that Delta One seats use color-coded lights to show different posture and lock statuses. The green TTL light specifically confirms the seat is upright and locked during TTL. When you see that green light, the seatback is fully raised, the locking mechanism is engaged, and the seat is in the proper configuration for the TTL phase. The other colors signal other states: red typically warns that the seat isn’t locked or is unsafe, amber usually indicates a caution or intermediate state, and blue denotes a different seat function rather than the upright-and-locked condition. In practice, crew use the green TTL light as the quick, clear signal that the seat is ready for that phase, and if it isn’t illuminated, the seat should be adjusted and re-locked until the green indicator appears.