followed by flight at high altitude and low temperature. Under these unusual
conditions, small amounts of emulsified water can precipitate from the fuel stream
and freeze in sufficient quantity to induce partial icing of the engine fuel system.
While these conditions are quite rare and will not normally be a problem for
owners and operators, they do exist in certain areas of the world and consequently
must be dealt with whenever encountered.
Therefore, to alleviate the possibility of fuel icing occurring under these unusual
conditions, it is required to add an ethylene glycol monomethyl ether (EGME or
DIEGME) compound to the fuel supply.
The introduction of an EGME or DIEGME compound into the fuel provides two
distinct effects:
-
It absorbs the dissolved water from the fuel,
-
Alcohol lowers the fuel’s freezing temperature.
EGME or DIEGME must be carefully mixed with the fuel in a concentration of
between a minimum of 0.06% and a maximum of 0.15% by volume.
provides EGME or DIEGME / fuel mixing ratio information.
CAUTION
Do not permit the EGME or DIEGME to come in contact with the airplane finish
or fuel tank.
Proper mixing of the EGME or DIEGME with the fuel is extremely important. An
excessive concentration (greater than 0.15% by volume maximum) will result in
detrimental effects to the fuel tanks through deterioration of the protective
primer, sealants and system seals, and engine components. Use only blending
equipment recommended by the manufacturer to obtain proper proportioning.
Prolonged storage of the airplane will result in a water buildup in the fuel which
leeches out the additive. An indication of this is when an excessive amount of
water accumulates in the fuel tank sumps. The concentration can be checked
using a differential refractometer. It is imperative that the differential
refractometer’s technical manual be followed explicitly when checking the additive
concentration.
Fuel and Fuel Additives in Ukraine and CIS countries
It is possible to use kerosene GOST 10227 RT with the addition of anti-icing
additive:
-
Liquid И - GOST 8313-88
The above-mentioned additive is added in the quantity equal to 0.3% per volume.
Section 8
Handling, Servicing and Maintenance
Pilot's Information Manual
PIM TBM 960 - Edition 0
Rev. 00
Page 8.7.4
PIM - DO NOT USE FOR FLIGHT OPERATIONS