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Airworthiness Directives; Rockwell International (Aircraft Specification No. A-2-575 Previously Held by North American and Recently Purchased by Boeing) Models AT-6 (SNJ-2), AT-6A (SNJ-3), AT-6B, AT-6C (SNJ-4), AT-6D (SNJ-5), AT-6F (SNJ-6), BC-1A, SNJ-7, and T-6G Airplanes; and Autair Ltd. (Aircraft Specification No. AR-11 Previously Held by Noorduyn Aviation Ltd.) Model Harvard (Army AT-16) Airplanes

Unsafe Condition: Fatigue cracks in the inboard and outboard, upper and lower wing attach angles (except for the nose angles) of both wings.

Why matched: Airworthiness Directives; Rockwell International (Aircraft Specification No. A-2-575 previously held by North American and recently purchased by Boeing) Models AT-6 (SNJ-2), AT-6A (SNJ-3), AT- 6B, AT-6C (SNJ-4), AT-6D (SNJ-5), AT-6F (SNJ-6), BC-1A, SNJ-7, and T-6G Airplanes; and Autair Ltd. (Aircraft Specification No. AR-11 previously held by Noorduyn Aviation Ltd.) Model Harvard (Army AT-16) Airplanes

Airworthiness Directives; Noorduyn Models Army UC-64, -64A, and -64B Aircraft

Unsafe Condition: Defective or deteriorated wood in the horizontal stabilizer ribs due to lack of drain holes, leading to water accumulation and structural damage.

Why matched: Airworthiness Directives; Noorduyn Models Army UC-64, -64A, and -64B Aircraft