Originally Posted by
rhklenke
From AMA document 5010-a, "SAFETY REGULATIONS FOR MODEL AIRCRAFT POWERED BY GAS TURBINES":
The fuel system shall have two fuel shut off provisions, one of which is manual and the other one must be remotely operated. An ECU operated shut down is compliant as a remote shut off if it closes with loss of power.
Thus, for most of us in the US with standard off-the-shelf engines, the ECU-controlled fuel solenoid is required.
Bob
The AMA rule does not use the word valve. It just says you must have 2 ways to shut of fuel flow.
The fuel pump does meet the requirements of the AMA rule. It is remotely operated, it is operated by the ECU, Loss of power will shut down flow since we are using positive displacement pumps. I still have, and will continue to have a fuel solenoid in all of my jets. But as the rule is written, if you do not need the solenoid valve for startup, I don't know that it is required per the rule.