18-12 Flight Checks
NOTE
Run-up and shutdown helicopter throughout procedure as
required per R66 Pilot's Operating Handbook (POH) Section 4.
NOTE
Refer to Section 18-15 for track and balance troubleshooting
procedures.
WARNING
Tail rotor balancing equipment must be removed for flight.
WARNING
Do not exceed V
NE
of helicopter during flight checks.
1. Prepare helicopter for main rotor track and balance per Section 18-11.
2. Make a photocopy of Figure 18-2; use copy to record flight data. Check main rotor
blade track in a hover and record data. Maximum blade spread in a hover is 0.25 inch.
Adjust track per Section 18-13 as required, record change, and recheck blade track in a
hover. Repeat step as required until blade track is within limits.
3. Check main rotor balance in a hover and record data. Maximum vibration allowance
is 0.2 ips (inches per second). Adjust balance per Section 18-14 as required, record
data, and recheck balance in a hover. Repeat step as required until main rotor balance
is within limits.
4. Fly helicopter at 50, 60, 70, 80, 90, 100, 110, 120, 130, and 140 knots. Check main
rotor blade track at each airspeed and record data. Maximum blade spread between
airspeeds is 3/8 inch. Adjust trim tab(s) per Section 18-13 as required and record data.
Repeat step as required until blade track is within limits.
5. Recheck main rotor balance in a hover per step 3.
6. Perform autorotation RPM check per Section 18-16. Recheck main rotor balance in a
hover per step 3.
7. Evaluate collective trim, longitudinal cyclic trim, and lateral cyclic trim. Adjust as
required. Recheck main rotor balance in a hover per step 3.
8. Remove track and balance equipment. Torque stripe fasteners. Reinstall removable
controls, as required.
25 OCT 2010 R66 Maintenance Manual Chapter 18 Track and Balance Page 18.5
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