AD Proposed for Bell 407 Fuel System Standpipe

The FAA has proposed adopting a new airworthiness directive (AD) for Bell Model 407 helicopters with serial numbers 54832 through 54931 inclusive, 54933 through 54939 inclusive, and 54942 through 54954 inclusive with a fuel system standpipe assembly (standpipe) part number 407-062-032-103 installed. 

Transport Canada AD CF-2023-11 advises that, due to a quality escape, the affected standpipes may have been delivered with sharp edges at the internal weld joints. If not corrected, this condition could lead to fuel quantity system wiring damage, loss of or erratic fuel quantity indication or a potential for fuel tank ignition.

The proposed AD would require inspection of the interior of the standpipe as shown in Bell Alert Service Bulletin 407-21-124, and inspection of the fuel quantity harness assembly. Depending on the results of the inspections, corrective actions before further flight may be directed.

Comments on this proposed AD are due April 5, 2024.