In an aircraft powered by a turbine engine, which information must be located near the fuel filler opening?

• A. The words Jet Fuel, permissible fuel designations, or references to the AFM for permissible fuel designations; additionally, for pressure fueling systems, the maximum permissible fueling supply pressure and the maximum permissible defueling pressure.
• B. The words Jet Fuel only
• C. The permissible fuel designations or references to the AFM
• D. The words Jet Fuel and the permissible designations or references to the AFM; and, for pressure fueling systems, the maximum permissible fueling supply pressure and the maximum permissible defueling pressure

Answer: (A)

The main idea is that the fuel filler area must clearly show exactly which fuels are approved and how fueling should be done, so ground crews don’t misfuel or over/under-fuel the aircraft. For turbine-powered airplanes, you need the words Jet Fuel to identify the fuel type, plus the permissible fuel designations or a direct reference to the AFM that lists which fuels are allowed. If the system uses pressure fueling, you also must display the maximum permissible fueling supply pressure and the maximum permissible defueling pressure. This combination keeps fueling correct and safe by making the approved fuel options and the operating pressure limits immediately visible. Omit any of these pieces, and you could risk using the wrong fuel or over-pressurizing the system during fueling.