Robinsons R66 - 18-20 Tail Rotor Dynamic Balance; 18-21 Preparing Helicopter for Tail Rotor Dynamic Balance

18-20 Tail Rotor Dynamic Balance
NOTE
Calibrate track and balance equipment per manufacturer's
recommendation, at least once a year, or if equipment is
dropped, misused, or calibration is suspect.
NOTE
The Chadwick-Helmuth Vibrex system, the TEC ACES system,
the Dynamic Solutions Systems’ MicroVib system, or equivalent
equipment is required to perform dynamic rotor balancing and
in-flight track checks.
18-21 Preparing Helicopter for Tail Rotor Dynamic Balance
NOTE
Use the following balance procedures in conjunction with
approved equipment manufacturer’s balancing instructions.
WARNING
Ensure cable(s) cannot entangle tail rotor.
1. Clean tail rotor blades per Section 20-10. Inspect tail rotor rod ends and elastomeric
bearings per Sections 5-33 and 5-34.
2. Track tail rotor blades per Section 64-10.
3. Refer to Figure 18-6. If using photocell to obtain clock angle, install a target tape
spanwise on inboard side of one arm of tail rotor hub; if using Strobex, install a target
tape spanwise on outboard side of hub.
4. Using appropriate hardware, attach bracket(s) to vibration transducer, and photocell, if
used. Secure bracket to tail rotor gearbox output shaft cap at forward, top attachment
bolt. Orient vibration transducer vertically.
5. Connect cable(s) to transducer, and photocell, if used. Route cable(s) forward and into
cabin; wrap around tailcone several times, and secure with duct tape. If using Strobex,
route cable to a position located approximately 20 feet to left of tail rotor. Place
sandbags (or similar) on cable to prevent cable movement.
6. Connect cable(s) to balancer. Verify security of installation.
SEP 2012 R66 Maintenance Manual Chapter 18 Track and Balance Page 18.17