5-42 Run-Up (continued)
16.
Check hydraulic system operation. Using cyclic-mounted hydraulics switch,
turn hydraulics OFF. Using small longitudinal cyclic inputs, there should be
approximately one-half inch of freeplay before encountering stiffness and
feedback. Return cyclic to neutral. Turn hydraulics ON. Controls should
be free with no feedback or uncommanded motion (“motoring”). Complete
flight checks with hydraulics on.
17.
Air conditioning (if installed): Verify system blows cold air on both low and
high settings. Verify no EMI/RFI with other instruments and systems. After
a flight with air conditioning on, verify water drains from drain tube in ship’s
belly (may be little or no water in very dry conditions).
5-43 Flight Check
1.
Hover:
a. Verify normal gage indications.
b. Verify controllability in left and right pedal turns.
c. Verify hydraulic system zeros cyclic stick forces.
d. Verify acceptable and normal vibration levels.
2. Level Flight:
Conduct at typical cruise altitude (weather permitting) and maximum
continuous torque. Loading to typical operating conditions or nominal
weight and CG in middle of envelope will provide the most useful evaluation.
a. Verify tail rotor pedal position when yaw string is centered.
Right pedal 0.25 to 0.75 inch forward of left pedal.
b. Verify tail rotor elastic trim cord zeros pedal forces (cord
applies left pedal force).
c. Verify hydraulic system zeros cyclic stick forces and collective
is balanced with no feedback.
d.
Verify acceptable control forces (feedback) with hydraulics
off.
e. Verify acceptable and normal vibration levels.
MAY 2015 Chapter 5 Inspections Page 5.11
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