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Section Title
18-10 Main Rotor Track and Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.1
18-11 Preparing Helicopter for Main Rotor Track and Balance . . . . . . . . . . . . . . 18.3
18-12 Flight Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.5
18-13 Track Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.7
18-14 Balance Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.10
18-15 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.11
18-16 Autorotational RPM Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.12
18-20 Tail Rotor Dynamic Balance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.17
18-21 Preparing Helicopter for Tail Rotor Dynamic Balance . . . . . . . . . . . . . . . . 18.17
18-22 Ground Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.19
18-23 Balance Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.19
18-30 Main Rotor Flight Control Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.21
18-40 Main Rotor Blade Angle Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.23
18-41 Collective Travel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.24
18-42 Cyclic Travel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.26
18-50 Tail Rotor Flight Control Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.28
18-51 Pedals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.28
18-52 Forward Bellcrank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.28
18-53 Intermediate Bellcrank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.28
18-60 Tail Rotor Blade Rigging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.29
18-70 Fan Shaft and Engine Shaft Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.33
18-71 Preparing Helicopter for Fan Shaft and Engine Shaft Balancing . . . . . . . . . 18.33
18-72 Ground Checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18.34
MAY 2015
CHAPTER 18
Chapter 18 Track and Balance
Page
Page 18.i
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Summary of Contents for Robinson R66
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Page 1: Table Of Contents
CHAPTER 18 TRACK AND BALANCE Section Title Page 18-10 Main Rotor Track and Balance ........18.1 18-11 Preparing Helicopter for Main Rotor Track and Balance . - Page 2 Intentionally Blank Page 18.ii Chapter 18 Track and Balance MAY 2015...
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Page 3: Track And Balance
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. Page 18.1 25 OCT 2010 R66 Maintenance Manual Chapter 18 Track and Balance... - Page 4 FIGURE 18-1 MAIN ROTOR BALANCING EQUIPMENT INSTALLATION Page 18.2 Chapter 18 Track and Balance R66 Maintenance Manual 25 OCT 2010...
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Page 5: Preparing Helicopter For Main Rotor Track And Balance
If strobe light is used, battery power may be accessed thru auxiliary power socket located on circuit breaker panel. Neatly stow and secure excess cables. 7. Verify security of installation. Page 18.3 25 OCT 2010 R66 Maintenance Manual Chapter 18 Track and Balance... - Page 6 C298-3 Weights C117-11 0.025 inch BALANCE TRACK (KNOTS) CLOCK HOVER Adjustment: CLOCK HOVER Adjustment: CLOCK HOVER Adjustment: CLOCK HOVER FIGURE 18-2 MAIN ROTOR TRACK AND BALANCE CHART Page 18.4 Chapter 18 Track and Balance R66 Maintenance Manual 25 OCT 2010...
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Page 7: Flight Checks
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. - Page 8 Fine Adjustment Fitting Only • One full turn changes blade track 0.25 inch. • One full turn changes blade angle 0.40º. FIGURE 18-3 MAIN ROTOR PITCH LINK Page 18.6 Chapter 18 Track and Balance R66 Maintenance Manual 25 OCT 2010...
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Page 9: Track Adjustment
18-13 Track Adjustment A. Main Rotor Blade Pitch Link Refer to R66 Illustrated Parts Catalog (IPC) Figure 62-5. NOTE Shorten high pitch blade when adjusting track in a hover. NOTE During rigging, adjust both pitch links exactly the same for collective adjustments. - Page 10 FIGURE 18-4 MAIN ROTOR BLADE TRIM TAB Page 18.8 Chapter 18 Track and Balance R66 Maintenance Manual 25 OCT 2010...
- Page 11 CAUTION Do not use other helicopter manufacturers' trim tab bending tools. Use of these tools will damage Robinson blades. CAUTION MT352-1 gage must contact trim tab trailing edge. If gage does not contact tab trailing edge, tab is bent beyond limit.
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Page 12: Balance Adjustment
1. Balance rotor assembly chordwise by adjusting chord arm weights or washers per Figure 18-2. Total weight not to exceed four A255-2 weights (or equivalent). (1) A255-1 Weight (8) AN970-4 Washers (1) A255-2 Weight (3) A255-1 Weights Page 18.10 Chapter 18 Track and Balance R66 Maintenance Manual 25 OCT 2010... -
Page 13: Troubleshooting
5. Radical Changes to MR teeter hinge bearings worn. Replace bearings per Section 62-21. Cyclic Trim Brinelled spindle bearing Send blade(s) to RHC for spindle bearing (rough movement). replacement. Page 18.11 25 OCT 2010 R66 Maintenance Manual Chapter 18 Track and Balance... -
Page 14: Autorotational Rpm Adjustment
Take at least 3 RPM readings at 500 to 1000 foot altitude intervals. Record the following in-flight data: Hourmeter Pressure Test % Test # Reading Altitude Page 18.12 Chapter 18 Track and Balance R66 Maintenance Manual 25 OCT 2010... - Page 15 6. Repeat previous steps as required until the RPM correction is ± 1% of chart RPM. Page 18.13 25 OCT 2010 R66 Maintenance Manual Chapter 18 Track and Balance...
- Page 16 One full turn of rod ends = approximately 3½% RPM change One full turn of rod end = 1⅙ turns of barrel Example: OAT=20°C, Hp=2000 ft, GW=1800 lb, RPM=103% FIGURE 18-5 AUTOROTATION RPM ADJUSTMENT Page 18.14 Chapter 18 Track and Balance R66 Maintenance Manual 25 OCT 2010...
- Page 17 Intentionally Blank Page 18.15 25 OCT 2010 R66 Maintenance Manual Chapter 18 Track and Balance...
- Page 18 FIGURE 18-6 TAIL ROTOR BALANCING EQUIPMENT INSTALLATION Page 18.16 Chapter 18 Track and Balance R66 Maintenance Manual 25 OCT 2010...
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Page 19: Tail Rotor Dynamic Balance
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. Page 18.17 SEP 2012 R66 Maintenance Manual Chapter 18 Track and Balance... - Page 20 (7) NAS1149F0663P Washers (1) A141-14 Washer NAS1149F0432P Washers (2) NAS1149F0632P (1) NAS1149F0663P Washer BALANCE CLOCK ADJUSTMENT: CLOCK ADJUSTMENT: CLOCK ADJUSTMENT: CLOCK ADJUSTMENT: FIGURE 18-7 TAIL ROTOR DYNAMIC BALANCE CHART Page 18.18 Chapter 18 Track and Balance R66 Maintenance Manual SEP 2012...
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Page 21: Ground Checks
RHC before further flight. 18-23 Balance Adjustment Refer to R66 Illustrated Parts Catalog (IPC) Figure 64-1. Refer to Section 64-11 for tail rotor assembly static balance procedure. A. Pitch Horn-to-Pitch Link Fastener (Chordwise Balance Adjustment) Chordwise dynamic balance is achieved by varying NAS6604 bolt length and nut-side washers on tail rotor blade pitch horn-to-pitch link fastener. - Page 22 FIGURE 18-8 SWASHPLATE AND COLLECTIVE CONTROL RIGGING FIGURE 18-9 A205-5 SWASHPLATE FORK RIGGING Page 18.20 Chapter 18 Track and Balance R66 Maintenance Manual 25 OCT 2010...
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Page 23: Main Rotor Flight Control Rigging
7. Refer to Figure 18-9. Adjust swashplate A205-5 lower fork assembly (non-rotating) to 3.70 ± 0.03 inch, and upper fork assembly (rotating) to 3.85 ± 0.03 inch. Page 18.21 25 OCT 2010 R66 Maintenance Manual Chapter 18 Track and Balance... - Page 24 FIGURE 18-10 MAIN ROTOR BLADE RIGGING Page 18.22 Chapter 18 Track and Balance R66 Maintenance Manual 25 OCT 2010...
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Page 25: Main Rotor Blade Angle Rigging
4. Position MT525-1 fixture on top of the blade’s tape at 49.5 inches, and tight against the leading edge. Position protractor on top of fixture, point protractor face toward the blade with hanging tape, and take blade angle reading. Page 18.23 SEP 2012 R66 Maintenance Manual Chapter 18 Track and Balance... -
Page 26: Collective Travel
0.030 inch per Figure 18-8. Adjust all swashplate push- pull tubes exactly the same amount as required (one full turn = 0.48°). Lengthening all push-pull tubes increases blade angles. Page 18.24 Chapter 18 Track and Balance R66 Maintenance Manual SEP 2012... - Page 27 0.030 inch per Figure 18-8. Adjust all swashplate push- pull tubes exactly the same amount as required (one full turn = 0.48°). Lengthening all push-pull tubes increases blade angles. Page 18.25 SEP 2012 R66 Maintenance Manual Chapter 18 Track and Balance...
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Page 28: Cyclic Travel
(one full turn = 0.6°). NOTE Remeasure cyclic left blade angles after making adjustment for cyclic right blade angles. Page 18.26 Chapter 18 Track and Balance R66 Maintenance Manual SEP 2012... - Page 29 18-42 Cyclic Travel (continued) C. Cyclic Forward 1. Position collective stick full down. Position cyclic stick in the lateral neutral (5 inches to left of right stop) position, and against forward stop. Apply control frictions; sandbag cyclic stick as required. 2.
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Page 30: Tail Rotor Flight Control Rigging
18-50 Tail Rotor Flight Control Rigging Refer to R66 Illustrated Parts Catalog (IPC) Figures 67-29 thru 67-39. 18-51 Pedals 1. Refer to Figure 67-4. Insert a 3/16-inch diameter rigging pin through the hole in the right-hand keel panel and the rigging pin holes in the C317-7 bellcrank. -
Page 31: Tail Rotor Blade Rigging
18-60 Tail Rotor Blade Rigging 1. Level helicopter laterally, and longitudinally via main rotor hub, per § 8-12. 2. Place left (or right) pedal against its stop. Position tail rotor blades parallel to the tailcone. 3. Refer to Figure 18-11. Tape a tracking stick to tailcone at blade tip. A tracking stick can be made using a 1”... - Page 32 18-60 Tail Rotor Blade Rigging (continued) 11. If the blade angle range for left and right pedal settings cannot be obtained using the preceding steps, pedal total travel is either too great or too small. Use the following procedure to check and adjust pedal travel: a.
- Page 33 Intentionally Blank Page 18.31 MAY 2015 Chapter 18 Track and Balance...
- Page 34 FIGURE 18-12 FAN SHAFT AND ENGINE SHAFT BALANCING Page 18.32 Chapter 18 Track and Balance MAY 2015...
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Page 35: Fan Shaft And Engine Shaft Balancing
18-70 Fan Shaft and Engine Shaft Balancing 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’... -
Page 36: Ground Checks
18-72 Ground Checks NOTE Run-up and shutdown helicopter throughout procedure as required per R66 Pilot's Operating Handbook (POH) Section 4. NOTE Use the following balancing procedures in conjunction with approved equipment manufacturer’s balancing instructions. WARNING Fan shaft and engine shaft balancing equipment must be removed for flight.
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