limitations arc imposed when alternate or emergency fuels are
used. For the purpose of recording. Fuel mixtures shall be
identified as to the major component of the mixture. except
when the mixture contains leaded gasoline. The use of any
emergency fuels will be entered in the FAULTS/REMARKS
column of DA Form 2408-13, Aircraft Maintenance and
Inspection Record, noting the type of fuel. additives, and
duration of operation.
Use of Kerosene Fuels. The use of kerosene fuels (JP-
5 type) in turbine engines dictates the need for observance of
special precautions. Both ground starts and air starts at low
ambient temperature may become difficult due to low vapor
Mixing of Fuels in Aircraft Tanks. When changing
from one type of authorized fuel to another, for example JP-4 to
JP-5, it is not necessary to drain the aircraft fuel system before
adding the new fuel.
Fuel Specifications. Fuel having the same NATO
code number are interchangeable. Jet fuels conforming to
ASTM D-1655 specification may be used when MIl,T-5624
fuels are-not available. This usually occurs during cross-
country flights where aircraft using NATO F-44 (JP-5,) are
refueling with NATO F40 (JP-4) or Commercial ASTM type B
fuels. Whenever this condition occurs, the engine operating
characteristics may change in that lower operating temperature,
slower acceleration, lower engine speed, easier starting, and
shorter range may be experienced. The reverse is true when
changing from F-40 (JP-4) fuel to F-44 (JP-5) or Commercial
ASTM Type A-1 fuels. Most commercial turbine engines will
operate satisfactorily on either kerosene or JP-4 type fuel. The
difference in specific gravity may possibly require fuel control
adjustments; if so, the recommendations of the manufacturers
of the engine and airframe are to be followed.
2-94. SERVICING OIL SYSTEM
An integral oil tank occupies the cavity formed between the
accessory gearbox housing and the compressor inlet case on the
engine. The tank has a calibrated oil dipstick and an oil drain
plug. Avoid spilling oil. Any oil spilled must be removed
immediately. Use a cloth moistened in solvent to remove oil.
Overfilling may cause a discharge of oil through the accessory
gearbox breather until a satisfactory level is reached. Service
oil system as follows:
Open the access door on the upper cowling to
gain access to the oil filler cap and dipstick.
A cold oil check is unreliable. If
possible, check oil within 10 minutes
after engine shutdown. If over 10
minutes have elapsed, motor the engine
(starter only) for 15-20 seconds, then
recheck. If over 10 hours have elapsed,
start the engine and run for 2 minutes,
then recheck. Add oil as required. Do
Remove oil filler cap.
incorporated, into the filler neck.
Replenish with oil to within 1 quart below
MAX mark or the MAX COLD (on dipstick
(cold engine). Fill to MAX or MAX HOT (hot
Check oil filler cap for damaged performed
packing, general condition and locking.
Insure that oil filler cap is correctly
installed and securely locked to prevent
loss of oil and possible engine failure.
6. If oil level is over 2 quarts low, motor or run
engine as required and as is necessary.
7. Install and secure oil filter cap.
8. Check for any oil leaks.
2-95. SERVICING HYDRAULIC BRAKE SYSTEM
Gain access to brake hydraulic system reservoir..
Remove brake reservoir cap and fill reservoir to
washer on dipstick with hydraulic fluid.
Install brake- reservoir cap.
Change 2 2-84