CSP−900RMM−2 MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 202
Revision 22
29-00-00
(e). Operate flight controls through a
minimum of 25 full-stroke cycles
with the hydraulic system pressur
ized.
(f). Leakage at the gland seals or at
weep holes shall not exceed 1 drop
per 25 cycles.
(g). Depressurize system and remove
GSE cart (Ref. Figure 201).
(2). Operate pumps by ground running
helicopter on one engine at idle (65%)
RPM per current Rotorcraft Flight
Manual (Ref. Section 01-00-00,
Table 201) and inspect the pumps seal
drain for a maximum seepage of 5
drops in 3 minutes.
C. Hydraulic System Static Leak Test
NOTE: Leakages are based on a static leakage
rate of 10 drops per dynamic seal.
(1). When main rotor control actuator
leakage is observed on aircraft standing
idle, the following procedure shall be
used to determine if leakage is unac
ceptable:
(2). Wipe actuator and clean up any fluid
spillage.
(3). Re-inspect in 24 hours. Accumulated
leakage from any of the three servoac
tuators shall not exceed the equivalent
of one teaspoon or roughly a fluid spot
not exceeding eight inches in diameter.
D. Hydraulic System Operational Test
(Aircraft Ground Run)
(1). Ground run helicopter per current
Rotorcraft Flight Manual (Ref. Section
01-00-00, Table 201).
(2). Perform hydraulic system check per
current Rotorcraft Flight Manual
(Ref. Section 01-00-00, Table 201).
(3). Shut down helicopter per current
Rotorcraft Flight Manual (Ref. Section
01-00-00, Table 201).
E. Hydraulic System Functional Test (with
GSE Pressure).
(1). Apply power to dc buses and close IIDS
circuit breaker (Ref. Section 96-00-00).
(2). Verify 1 HYD 2 caution segments
illuminate on IIDS panel.
(3). Select HYD PRESS on IIDS alphanu
meric display (Ref. Section 95-00-00).
(4). Apply 1000 psig external hydraulic
pressure to system 1 (Ref. Section
29-00-00).
(5). Slowly decrease pressure to 200 psig
and then slowly increase pressure to
1000 psig.
NOTE: Hydraulic system 2 caution segment
should remain illuminated throughout this
portion of test.
(a). Verify pressure indication on IIDS
panel alphanumeric display.
(b). Verify that hydraulic system 1
caution segment illuminates before
250 psig and that segment goes out
at or before 510 psig.
(6). Remove external hydraulic pressure
and disconnect GSE cart from system 1
GSE ports (Ref. Section 29-00-00).
(7). Turn off dc power (Ref. Section
96-00-00).
(8). Repeat Steps E-1 through E-8 for
system 2.
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