Bell 212

TAIL ROTOR
64-1. TAIL ROTOR. A two-blade, controllable pitch tail rotor hub
and blade is located on the right side of the
tail rotor gearbox. It is composed of two
assemblies, the hub and theblades, and is driven from the transmission through the tail rotor gearbox.
system for tail rotor. Helicopter S/N
30680 through 31134 are equipped with flap bearing wear indicator. 64-2.TROUBLESHOOTING. NOTE Helicopter S/N 30650 through 31134
are equipped with dynamic balance Potential troubles which may occur in tail rotor are listed in table 64-1 with probable causes indicated and correctiveaction
recommended. Table 64-1. Tail rotor troubleshooting
INDICATION OF
TROUBLE PROBABLE CAUSE CORRECTIVE ACTION
I High frequency vibration. Tail rotor out of track. Check tracking of tail rotor(Chapter 18). Tail rotor out of balance. Check and balance tail rotor I (Chapter 18). Loose tail rotor retaining nut. Torque retaining nut 850 to
900 inch-lbs. (96.05 to-101.7 Nm). Tail rotor pitchchange links Replace damaged links. bent. Worn or loose pitch change Replace bearing and/or wear
tube bearing. sleeve on tube. 90° gearbox mounting loose. Inspect gearbox mounting
for loose rivets orstuds or elongated bolt holes. Repair mounting. Inability to make normal Faulty rigging. Rig tail rotor controls. right and left turns in flight. Controls creeping. Hydraulic cylinder in tail Replacefaulty hydraulic
rotor controls leaking cylinder.
internally. 64-3. OPERATIONAL CHECK. Operational check of tail rotor hub and blade consists of tracking and dynamic balance of
tail rotor hub andblade (Chapter 18). 64-00-00 Rev.5 Page 3/43-N
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B HT-212-M M HUB AND BLADE ASSEMBLY (212-010-701) 64-4. HUB AND BLADE ASSEMBLY (212-010-701). Accomplish the following maintenance
procedures for the 212-010-701 hub and
blade assembly. For the 212-01 1-701 hub and blade assembly, refer to paragraph 64-10. 64-5. MAINTENANCE. 64-6....