FAA Requires Inspection and Repair of Electrical Harnesses on Bell 407 Helicopters

The Federal Aviation Administration is requiring owners and operators of certain Bell Textron Canada Model 407 helicopters to inspect and repair electrical wiring. The rule, published as a final Airworthiness Directive, mandates a one-time visual inspection of harnesses behind the instrument panel to check for chafing. If damage is found, the wiring must be repaired. The directive also requires rotating a connector housing, installing a wire harness bracket and support, and adding a protective sleeve to the wire bundle on specific helicopters. This action follows a safety determination by Transport Canada, the aviation authority for Canada. The FAA adopted the rule as proposed after receiving no public comments. The rule takes effect on June 25, 2026.

Why it matters: This rule addresses a specific safety risk: electrical wires rubbing against metal parts could wear through insulation, potentially causing a cockpit fire or loss of control. For helicopter operators, the practical effect is a mandatory maintenance check. The FAA estimates the inspection alone will cost about $680 per aircraft, with additional costs for parts and labor to install brackets and sleeves. The total estimated cost to U.S. operators is approximately $345,000 across the 333 affected helicopters. The rule is mandatory; operators cannot fly these helicopters without complying with the inspection and repair requirements.

Who it affects

• Owners and operators of Bell Textron Canada Model 407 helicopters with serial numbers 54300 through 54752, 54805 through 54999, 56300 through 56366, and 56368.

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The Federal Aviation Administration issued this final Airworthiness Directive in the Federal Register; operators should review the full text of Docket No. FAA-2026-0736 before scheduling maintenance.

Agency: Transportation Department, Federal Aviation Administration
Source: Federal Register — read the official document