76-12 FCU Fuel Cutoff Control Rigging (continued)
5. Push fuel cutoff control knob ON and verify FCU fuel cutoff lever-to-maximum fuel
stop clearance is 0.030-0.090 inch. Reposition fitting on wire as required until FCU
fuel cutoff lever rests in detent when control is OFF and has required clearance from
maximum fuel stop when control is ON.
6. Install fitting palnut, standard torque per Section 20-32, and torque stripe per Figure
5-1. Trim control wire 0.10-0.30 inch beyond aft edge of fitting.
7. Install engine cowling assembly per Section 53-21.
76-20 Power Turbine Governor (PTG)
Refer to R66 Illustrated Parts Catalog (IPC) Figures 76-5 and 76-7.
A. Removal
1. Remove engine cowling assembly per Section 53-21.
2. Refer to Figure 76-2. Remove cotter pin and washer securing C522-11 (power turbine
governor) control inner sleeve and D333-13 fitting to PTG input lever.
3. Remove fasteners securing control housing and AN742-4 clamps to F046-1 lower frame,
as required.
4. Remove PTG per RR300 Series Operation and Maintenance Manual (OMM).
B. Installation
1. Install PTG per RR300 Series Operation and Maintenance Manual (OMM).
2. Perform PTG control rigging per Section 76-21.
76-21 PTG Control Rigging
1. Remove engine cowling assembly per Section 53-21. Detach center back rest assembly
hook and loop tape (Velcro) at bottom; slide back rest assembly up and out of keyhole
slots. Remove F474-2 middle seat cover (see Section 6-70).
2. Refer to Figure 76-2. Verify PTG input lever rigging angle is 93.0° ± 7.5°. As required,
remove hardware securing serrated levers and reposition to proper angle. Install
hardware, special torque nut per Section 20-33, and torque stripe per Figure 5-1.
3. Refer to Figure 76-3. Remove palnut and loosen nut securing A462-4 fitting and C522-
11 (power turbine governor) control inner wire to F822-1 bellcrank assembly.
4. Position PTG pointer to indicate 45° on PTG protractor. Position aft end of control
housing 1.44-1.50 inches from forward edge of D333-13 fitting and install fasteners
securing housing and AN742-4 clamps to F046-1 lower frame.
5. Position forward end of control housing flush-0.25 inch at or below edge of bottom
AN742-3 clamp and install fasteners securing housing and clamps to F381-6 bracket.
6. Turn BATTERY switch ON. With collective stick full down, “beep” collective toggle
switch to full down. Turn BATTERY switch OFF.
25 OCT 2010 R66 Maintenance Manual Chapter 76 Engine Controls Page 76.5
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