TB 55-9150-200-24
2-6. Emergency Fuel.
a. Insure that the approval of the pilot is obtained prior to servicing an aircraft with an emergency fuel. The aircraft
should be placarded in a conspicuous manner indicating the type emergency fuel used..
b. Gasoline fuel is used in some turbine engines under emergency conditions.
c. The use of straight unleaded gasoline may shorten the operating life of combustion parts; therefore, its use
between scheduled internal inspections is limited. Refer to table 2-3 notes. When the allowable operating time has been
reached, the use of unleaded gasoline must be discontinued pending result of internal inspection. Unleaded gasoline
leaves combustor parts clean; therefore, no special cleaning is required between scheduled hot end inspections. Two
parts of unleaded gasoline mixed with one part of kerosine produces a fuel which is preferred above that of straight
unleaded gasoline. This mixture should be identified in the fueling record.
d. Leaded gasoline, either straight or mixed with unleaded fuel in any proportion, will deposit a layer of lead
compounds on combustor parts. These attack the underlying metal and also act as an insulator which reduces
combustion efficiency and causes the formation and deposition of carbon. Therefore, the operating time between
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