EASA AD CF-2025-22: Communication — Electrical harness chafing condition

What to do

Operators of affected Bell 407 helicopters must perform a detailed visual inspection of electrical harnesses behind the instrument panel within 100 flight hours or 90 days from May 7, 2025, whichever occurs first. They must install protective sleeves, rotate connector housings, and install wire harness supports as specified. Any damaged wires or bundles found must be repaired before further flight following the applicable Bell Textron Canada Alert Service Bulletin.

Summary

Canadian Airworthiness Directive CF-2025-22 addresses an electrical harness chafing condition in Bell Textron Canada Limited Model 407 helicopters, specifically serial numbers 54300 through 54752, 54805 through 54999, and 56300 through 56366 and 56368. The directive requires inspection and corrective actions to prevent potential smoke or fire hazards in the cockpit caused by chafing of electrical harnesses near the instrument panel. This directive is issued under Canadian Aviation Regulation 521.427 and applies from May 7, 2025.

What changed

CF-2025-22 introduces mandatory inspections and corrective measures for electrical harness chafing in specified Bell 407 helicopters. It requires detailed visual inspections, installation of protective sleeves, rotation of connector housings, and installation of wire harness brackets to mitigate the risk of chafing. Repairs must be made before further flight if damage is found.

Why it matters

This directive is critical for maintaining flight safety by preventing electrical harness chafing that could lead to smoke or fire in the cockpit. Operators and maintenance teams must ensure compliance to avoid unsafe conditions and potential operational disruptions. Timely adherence supports regulatory compliance and aircraft airworthiness.

What to do

Summary

What changed

Why it matters

More for Bell 407