Aviation Stack Exchange is a question and answer site for aircraft pilots, mechanics, and enthusiasts. It only takes a minute to sign up.
Sign up to join this community
In this video, there is a shot of the side of a P-51 Mustang.
The side of the plane is painted with:
SERVICE THIS AIRPLANE WITH GRADE 100/150 FUEL. IF NOT AVAILABLE T.O. 06-5-1 WILL BE CONSULTED FOR EMERGENCY ACTION SUITABLE FOR AROMATIC FUEL
What does this mean?
They are instructions for a compatible fuel substitute for 100/150 octane fuel per Technical Order 06-5-1 if AvGas is unavailable to the service crews in an emergency.
In my opinion, it's a reminder that 1) fuel should be 100-150 octane, and 2) when not available, a gasoline rich in aromatic hydrocarbons (i.e. high-octane) could be used in emergencies, following the document T.O. 06-5-1.
