EASA SIB CASA-2018-11: Bell Helicopter 206 Helicopters - Unporting of Fuel Boost Pump

What to do

Operators should ensure minimum fuel quantities recommended in the RFMs are observed and strictly follow procedures related to the FUEL LOW caution light if installed. Installation of a low fuel warning device is recommended, especially for flights frequently conducted near minimum fuel levels. Avoid uncoordinated turns or maneuvers when fuel is low and incorporate the amended RFMs approved by Transport Canada, informing flight crews of these changes. No specific compliance deadlines are stated.

Summary

The Transport Canada Civil Aviation Safety Alert CASA 2018-11 addresses the risk of engine flameout due to unporting of fuel boost pumps in Bell Helicopter 206 series models, including 206A, 206B (including 206B3 commercial designation), and 206L variants. This alert highlights the danger during low fuel levels combined with uncoordinated flight maneuvers, which can cause fuel starvation and sudden loss of engine power. The document raises awareness for owners, operators, and maintainers of these helicopters to mitigate this safety risk.

What changed

Bell Helicopter Textron Canada Limited has amended the rotorcraft flight manuals (RFMs) for Bell 206A, 206B, and 206B3 models to include consistent terminology advising pilots to 'Land as soon as practical' when the FUEL LOW caution light illuminates. Warnings were added to address rotorcraft without a FUEL LOW caution light system, emphasizing avoidance of uncoordinated turns or maneuvers with low fuel. Similar amendments will be made to the 206L series RFMs to prevent fuel starvation during low fuel conditions.

Why it matters

This alert is critical for aviation professionals because fuel starvation leading to engine flameout can cause forced landings, especially during low altitude operations common in aerial survey and agricultural spray work. Understanding the fuel system design and adhering to updated flight manual procedures reduces the risk of sudden power loss. Operators and maintenance teams must ensure compliance to enhance flight safety and prevent accidents related to fuel boost pump unporting.