MD Helicopters MILVIZ MD530F, Rotorcraft Flight Manual, Page: 110 / 326

MD 500
(Models 369HE/HS/HM) ROTORCRAFT FLIGHT MANUAL CSP
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HE/HS
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1
Normal Procedures
FAA Approved
Revision 5
4
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6
e e Chip detector and wiring. CHECK
e e Control push−pull rod and bellcrank. CHECK
e e Tail rotor transmission oil level.
CHECK
e e Output shaft dust cover, retainer nut, tang washer
and rubber bumper.
CHECK
Check for torque stripe paint across retainer nut, tang washer, and
CAUTION
fork assembly. If torque stripe on nut and tang washer is not in
line with stripe on drive fork, the tang washer inner key tang may
be sheared. Advise maintenance.
e Tail rotor drive fork conical/sphericalbearings (if
installed):
e e
Pivot tail rotor hub and fork through full range of travel
and check for axial play between the conical bearing
inner and outer races. No play is allowed.
e Tail rotor drive fork elastomeric bearings (if installed):
CHECK
NOTE
: Check bearing for general condition. Elastomeric bearings are suspected of
being unserviceable if rubber deterioration or separation, or a vibration is noted.
Evidence of light swelling, pock marks and crumbs are surface conditions and
are not indications of bearing failure.
e e
Apply teetering force by hand to tail rotor blades
(stop−to−stop). Check for fork−to−bearing bond failure.
Failure is indicated by any motion between outer
bearing cage and fork (bearing turns in fork).
e e
Teeter blades stop−to−stop. Observe four radial molded
ridges on each bearing as teetering takes place. If ridges
assume continuous curved shape, bearings are intact.
Discontinuity in molded ridges indicates bearing failure.
e Tail rotor pitch bearing
CHECK
CHECK
e e
Hold tail rotor hub firmly and check lead−lag play at
tip of each blade. Play in excess of approximately 0.25
in. on either blade is not considered acceptable.
CHECK FOR WEAR
e
Tail rotor blades and abrasion strips CHECK
NOTE
: Visually check each tail rotor blade abrasion strip for evidence of debonding
along the abrasion strip/airfoil bond line.
e
Tail rotor blade pitch links CHECK
e
Tail rotor drive shaft coupling NO DAMAGE
ALLOWED
e e Rock tail rotor back and forth in plane of rotation and check main rotor blades
for coincidental movement.