Flexible hose used in aircraft systems is classified in size according to which dimension?

Flexible hose used in aircraft systems is classified in size according to which dimension?

• A. Outside diameter
• B. Inside diameter
• C. Nominal diameter
• D. Overall length

Answer: (B)

Sizing a flexible hose for aircraft systems is based on the inside bore because it sets how much fluid or air can flow and what fittings will match. The inner diameter determines the flow capacity and pairs directly with the hose fittings, so you select hose by the bore size to ensure proper connection and performance. The outside diameter varies with wall thickness and cover material and mainly affects the physical fit around clamps and routing, not the flow or the fittings. Nominal diameter is a general reference used in piping contexts, not the primary way aircraft hoses are sized, and overall length is just how long the hose is, not its capacity. So the inside diameter is the dimension that defines the hose size.

Sizing a flexible hose for aircraft systems is based on the inside bore because it sets how much fluid or air can flow and what fittings will match. The inner diameter determines the flow capacity and pairs directly with the hose fittings, so you select hose by the bore size to ensure proper connection and performance. The outside diameter varies with wall thickness and cover material and mainly affects the physical fit around clamps and routing, not the flow or the fittings. Nominal diameter is a general reference used in piping contexts, not the primary way aircraft hoses are sized, and overall length is just how long the hose is, not its capacity. So the inside diameter is the dimension that defines the hose size.