Fuel Grades and Additives

This is a jet-fuel twin, and its approved grades span four national standards. The additive rules are exact — each has a ppm ceiling, mixing types is forbidden, and the anti-icing additive may not be used with every approved grade.

At a glance

• Recommended minimum cetane number36 (EN ISO 5165 / ASTM D613)
• KATHON FP 1.5 (anti-microbial)maximum 100 ppm
• BIOBOR JF, initial treatmentmaximum 270 ppm
• BIOBOR JF, permanent usemaximum 135 ppm
• PRIST Hi-Flash (anti-icing)maximum 1500 ppm

Approved fuel grades

• JET A and JET A-1 (ASTM D 1655);

• TS-1 and RT, to the Russian and Ukrainian standards;

• No. 3 Jet Fuel (China, GB 6537-2006);

• JP-8 (F34) (USA, MIL-DTL-83133G-2010);

• blends of the listed grades.

NOTE — A minimum cetane number of 36 is recommended, determined in accordance with EN ISO 5165 / ASTM D613.

Only uncontaminated fuel from reliable sources may be used, and any mixture of different types of fuel additive is not permitted.

Anti-microbial additives

• KATHON FP 1.5 — maximum 100 ppm.

• BIOBOR JF — maximum 270 ppm for initial treatment, and maximum 135 ppm for permanent use after that initial treatment.

CAUTION — Where the fuel additive dosage is unknown or excessive, purge the fuel system until the dosage falls back inside the permitted limits.

A higher dosage of a specified additive is allowed for cleaning the fuel system, following the additive supplier's instructions. The engine must not be operated during cleaning.

Anti-icing additive

The permitted anti-icing fuel additive is PRIST Hi-Flash, to a maximum of 1500 ppm.

CAUTION — The use of PRIST Hi-Flash is restricted to JP-8 (F34), JET A and JET A-1 (ASTM D 1655), and to nothing else.

Check yourself

• Which fuel grades are approved, and may they be blended?

• What is the ppm ceiling for KATHON FP 1.5, and what are the two figures for BIOBOR JF?

• What must be done if the additive dosage is unknown or excessive?

• Which additive is the anti-icing one, at what maximum, and which grades may it be used with?

• What cetane number is recommended?

Study aid — always fly your aircraft's current AFM/POH.