Transport Canada CF-2024-11

Requires marking certain tail rotor blades and inspections to detect any potential cracks until a terminating action can be determined. Prompted by several reports of tail rotor abrasion strip cracks. A subsequent investigation found that a supplier missed a crucial step in the fabrication of the abrasion strip that could result in the presence of stress risers leading to fatigue cracking of the part. Undetected cracking of the abrasion strip could lead to tail rotor blade failure and catastrophic consequences such as severe imbalance and destruction of the tail rotor gearbox and subsequent loss of directional thrust during takeoff and landing.