A non-destructive inspection apparatus for inspecting a structure, the structure including a first portion (4,6) and a second portion (5,7) with a radius portion (8,9) defined therein between, the radius portion having a concave curved feature and a convex curved feature and the structure having opposing surfaces (702, 704), the apparatus comprising: a non-destructive inspection probe having a first ultrasonic sensor holder and a second ultrasonic sensor holder, the first sensor holder including a first ultrasonic linear array inspection sensor positionable relative to the first portion of said structure, a second ultrasonic linear array inspection sensor positionable relative to the second portion of the structure and a convex curved ultrasonic linear array inspection sensor positionable relative to the concave curved radius feature of the structure, wherein a curved linear array sensor is an inspection sensor including a plurality of transducers that are oriented in a convex or concave curved shape to inspect a curved radius feature, the sensors of the second sensor holder including a third ultrasonic linear array inspection sensor positionable relative to the first portion of the structure, a fourth ultrasonic linear array inspection sensor positionable relative to the second portion of the structure and a concave curved ultrasonic linear array sensor positionable relative to the convex curved radius feature of the structure, the first and second sensor holders being configured such that when the structure is received therein between, one of the sensors (710a, 710b, 710c, 712a, 712b and 712c) of each of the sensor holders (708a, 708b) is positionable relative to a respective opposing surface of each of the portions such that each portion of the structure is inspectable substantially at the same time. a non-destructive inspection probe having a first ultrasonic sensor holder and a second ultrasonic sensor holder, the first sensor holder including a first ultrasonic linear array inspection sensor positionable relative to the first portion of said structure, a second ultrasonic linear array inspection sensor positionable relative to the second portion of the structure and a convex curved ultrasonic linear array inspection sensor positionable relative to the concave curved radius feature of the structure, wherein a curved linear array sensor is an inspection sensor including a plurality of transducers that are oriented in a convex or concave curved shape to inspect a curved radius feature, the sensors of the second sensor holder including a third ultrasonic linear array inspection sensor positionable relative to the first portion of the structure, a fourth ultrasonic linear array inspection sensor positionable relative to the second portion of the structure and a concave curved ultrasonic linear array sensor positionable relative to the convex curved radius feature of the structure, the first and second sensor holders being configured such that when the structure is received therein between, one of the sensors (710a, 710b, 710c, 712a, 712b and 712c) of each of the sensor holders (708a, 708b) is positionable relative to a respective opposing surface of each of the portions such that each portion of the structure is inspectable substantially at the same time.