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an engine and that oil is not available, the other type may be
used in an emergency.
e. Remove the filler cap. Fill the tank with oil until the
indicator shows full. Do not overfill tank.
f. Install the filler cap. Close both access panels.
2-15-14. APU Oil System.
Service the APU as follows:
CAUTION
Do not use the APU drip pan as a handhold.
Damage to equipment will result.
a. Remove the filler cap from the left side of the APU
(fig. 2-15-2).
CAUTION
Do not overfill. Damage to the APU can
result from overfilling.
b. Add oil to the APU oil tank until the level reaches the
FULL mark on the sight gage. Under normal conditions, the
APU shall be serviced with one type of oil only. If one type
of oil is in an APU and that oil is not available, the other type
may be used in an emergency.
c. Reinstall and check security of the filler cap.
TM 1-1520-240-10
2-15-15
2-15-15. Transmission Oil System.
Service the forward transmission, engine/combining transmission,
and aft transmission as follows:
a. Access to oil filler and location of sight gage of each
transmission (fig. 2-15-2) are as follows.
(1) The oil filler and sight gage for forward transmission
are accessible within the hinged fairing on the right
side of the forward pylon. The filler neck is in the top forward
area of the transmission. The sight gage is located in the
bottom area below the filler neck; it can be viewed from
above and can also be seen through a viewing port in the
canted bulkhead at sta. 95 above the pilot’s seat.
(2) The oil filler and sight gage for aft transmission
is on forward right side of the transmission sump. It is accessible
from the cargo ramp area.
(3) The common oil filler for the combining transmission
and both engine transmissions is on the combining
transmission oil tank. It is accessible within the fairing of aft
pylon leading edge.
b. Refer to DA Form 2408-13-1 and table 2-15-1 for
the type of oil to use. Under normal conditions, the transmissions
shall be serviced with one type of oil only. If one type
of oil is in an transmission and that oil is not available, the
other type may be used in an emergency.
NOTE
To prevent overfilling the engine and combining
transmissions, check oil level within 30
minutes of shutdown. If the transmissions
have been shut down for more than 30 minutes,
run the helicopter for a minimum of 5
minutes to verify oil level before servicing.
NOTE
To prevent overfilling the forward and aft
transmission, check oil level after the aircraft
has been shut down for 30 minutes.
c. Fill the forward transmission, engine/combining and
aft transmissions to the FULL mark next to each sight
gage.
2-15-16. Hydraulic Systems Servicing.
2-15-17. Hydraulic Systems Fluid Servicing.
The utility systems and both flight control hydraulic systems
are serviced by a common fill module on the right side of the
helicopter above the ramp (fig. 2-15-2). The fluid level indicators
are on the MAINTENANCE PANEL above the fill
module. One indicator is for both flight control hydraulic
systems. The other indicator is for the utility system. Direct
level checks can also be made from the reservoir piston
rods. Service any system as follows:
a. Check the sight gage on the fill module reservoir for
fluid level. If fluid cannot be seen on the sight gage, fill the
reservoir.
b. Check the fluid level in the flight control reservoirs by
selecting each system at the FLT CONTR switch on the
MAINTENANCE PANEL. Then press the LEVEL
CHECK switch. Check the fluid level in the utility reservoir
by pressing the LEVEL CHECK switch.
c. Turn the system select valve to the position for
the system to be serviced.
d. Using the handpump on the fill module, pump
fluid into the system until the fluid in the reservoir is at the
FULL mark. Keep the sight gage on the fill module full of
fluid by adding fluid to the reservoir as required.
e. Turn the system select valve to OFF.
2-15-18. Hydraulic Systems Accumulator Precharge.
Figure 2-15-3 depicts the relationship between proper
accumulator precharge and ambient temperature. To
check that an accumulator is properly precharged, read
free air temperature from the FAT gauge. Enter the bottom
of the chart at the indicated temperature and move
vertically to the pressure indicated on the accumulator
pressure gage. If the indicated pressure is within the
minimum and maximum limits, the accumulator is properly
precharged. If the indicated pressure is not within
limits, refer to TM 55-1520-240-23 to service the accumulator.
　
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