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-l 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.
2-95. SERVICING OIL SYSTEM
An integral oil tank occupies the cavity formed
between the accessory gearbox housing and the com-
pressor inlet case on the engine. The tank has a cali-
brated oil dipstick and an oil drain plug. Avoid spill-
immediately. Use a cloth moistened in solvent to
remove oil. Overfilling may cause a discharge of oil
through the accessory gearbox breather until a satis-
factory level is reached. Service oil system as fol-
Open the access door on the upper cowling
to gain access to the oil filler cap and dip-
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 not overfill.
Remove oil filler cap.
Insert a clean funnel, with a screen incorpo-
rated, 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
Check oil filler cap for damaged preformed
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.
If oil level is over 2 quarts low, motor or run
engine as required, and service as necessary.
Install and secure oil tiller cap.
Check for any oil leaks.
2-96. SERVICING HYDRAULIC BRAKE SYSTEM
Gain access to brake hydraulic system reser-
2. Remove brake reservoir cap and till reser-
voir to washer on dipstick with hydraulic
Install brake reservoir cap.
2-97. INFLATING TIRES.
Inflate tires as follows:
Inflate nose wheel tires to a pressure
between 55 and 60 PSI.
2. Inflate main wheel tires to a pressure
between 73 and 77 PSI.
2-98. SERVICING THE CHEMICAL TOILET.
The toilet should be serviced during routine
ground maintenance of the aircraft following any
The waste storage container should be
its disposable plastic liner
replaced, and the container replaced in the toilet
cabinet. Toilet paper, waste container plastic liners,
and dry chemical deodorant packets should also be
resupplied within the toilet cabinet as needed.
SERVICING THE AIR CONDITIONING SYS-
Servicing the air conditioning system consists of
checking and maintaining the correct refrigerant
level, compressor oil level, belt tension and condi-
tion, system leak detection, and replacement of the
evaporator air filters. It is imperative that the main-
tenance of the air conditioning system, except for fil-
ter replacement, be accomplished only by qualified
refrigerant system technicians. Flexible fiberglass fil-
ters cover the evaporator coils and should be
replaced after 300 hours of operation. Install filters
Forward Evaporator Filter Replacement:
Remove the access door in the nose
wheel well keel under the refrigerant