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2-15-19. Flight Controls Hydraulic Systems Accumulators.
The No. 1 flight control system accumulator is within the
forward transmission fairing, on the right side. The No. 2
system accumulator is within the aft pylon, on the right
side. Determine either accumulator precharge as follows:
a. Access to the respective accumulator.
b. Note precharge on accumulator and ensure is
within limits as per figure 2-15-3.
c. If servicing is required, refer to TM
55-1520-240-23.
2-15-20. Utility System Accumulators.
There are five accumulators in the utility hydraulic system.
They provide pressure to start the APU, operate the
power brakes and swivel locks, and maintain line pressure
throughout the system.
a. The APU start accumulator is the largest in the
helicopter. It is mounted overhead in the ramp area at the
right of the aft transmission sump. The APU start module
accumulator is located aft and to the right of the APU start
accumulator. The utility reservoir pressurization (bootstrap)
accumulator is located forward of the No. 2 flight
control accumulator in the aft pylon, accessible through
the pylon right access panel. Determine accumulator
precharge as follows:
(1) Depressurize the accumulator by turning
the handle on the UTILITY RESERVOIR DEPRESSURIZE
valve to OPEN. The valve is on the right side of the
cabin, in the cargo ramp area.
TM 1-1520-240-10
2-15-16
(2) Press and hold the depressurization valve
on the APU start module accumulator until system pressure
is depleted. When the accumulator has been depressurized,
return the handle of the UTILITY RESERVOIR
DEPRESSURIZE valve to NORMAL.
(3) Not precharge on accumulators and ensure
is within limits as per figure 2-15-3.
(4) If servicing is required, refer to TM
55-1520-240-23.
b. The power steering and swivel lock accumulator
is located on the right side of the cabin, in the cargo ramp
area. Determine accumulator precharge as follows:
NOTE
An alternate method is to apply external power
to the helicopter and cycling the STEERING
CONTROL SWIVEL STEER switch on
the center console from LOCK to UNLOCK
several times.
(1) Depressurize the accumulator by starting
the APU and placing the APU GEN switch to ON.
(2) Place the HYD BRK STEER isolation switch
on the overhead switch panel to OFF. Cycle the STEERING
CONTROL SWIVEL STEER switch on the center
console from LOCK to UNLOCK approximately six
times.
(3) Note precharge on accumulator and ensure
precharge is within limits as per figure 2-15-3.
(4) If servicing is required, refer to TM
55-1520-240-23.
c. The brake accumulator is located within the aft
left side of the forward transmission fairing. Determine
accumulator precharge as follows:
(1) Depressurize the accumulator by pressing
the brakes approximately four times or until it becomes
hard to apply the brakes.
(2) Accumulator precharge should read between
600 and 850 psi.
(3) If servicing is required refer to TM
55-1520-240-23.
2-15-21. Ground Handling (Towing).
Refer to TM 55-1520-240-23.
2-15-22. Parking.
Park helicopter as directed in the following steps:
a. Apply wheel brakes. Then, set the parking brakes.
b. Place chocks as required.
CAUTION
Failure to position blades properly can allow
a blade to hit the fuselage. This may
damage the fuselage and blade.
c. Position rotary-wing blades 30 off centerline of
helicopter.
d. Unplug the battery after the last flight of the day.
TM 1-1520-240-10
Change 2 2-15-17
FLIGHT CONTROL, UTILITY, POWER STEERING AND SIGNAL ACCUMULATORS
APU START ACCUMULATOR
Figure 2-15-3. Accumulators Precharge Limits
TM 1-1520-240-10
2-15-18
e. Lock all doors and hatches.
f. Moor the helicopter (refer to TM
1-1500-250-23).
2-15-23. Mooring.
Refer to TM 1-1500-250-23.
2-15-24. Protective Covers.
The following protective covers should be stowed in the
helicopter (fig. 2-15-4 and 2-15-5). They are used as
necessary whenever helicopter is parked or moored.
a. Engine (LH) inlet cover or EAPS (LH) inlet cover.
b. Engine (RH) inlet cover EAPS (LH) inlet cover.
c. Engine outlet cover (2 ea).
d. Hydraulic cooler exhaust cover
e. Pitot tube covers (2 ea)
f. Aft transmission cooler and APU exhaust cover.
g. Transmission and hydraulic cooler intake.
h. Transmission and hydraulic cooler exhaust (LH
and RH).
i. Transmission and hydraulic cooler inlet (aft pylon).
j. Cockpit enclosure protective cover
k. Rotor hub protective cover (2 ea).
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