SEP 2012 R66 Maintenance Manual Chapter 21 Environment Control Page 21.11
21-30 Cabin Heat
21-31 Valve Assembly and Control Rigging
Refer to R66 Illustrated Parts Catalog (IPC) Figures 21-31 and 21-35.
A. Removal
1. Refer to Section 6-70. Remove hardware securing F794-1 and F794-2 (belly cover)
panels and remove panels. Remove engine cowling per Section 53-21.
2. Refer to Figure 21-3. Remove hardware securing A522-14 (heater valve) control
inner wire to G019-1 (heater) valve assembly arm.
3. Remove hardware securing AN742-3 clamps and control housing to F621-2 bracket.
4. Hinge aft right seat forward. Remove clamps, spacers, and hardware securing G391-2
and G391-5 line assemblies to aft right keel panel. Hinge seat back.
5. Loosen line assembly B-nuts from G400-2 muffler assembly & G396-1 union; disconnect
lines from valve assembly fittings and remove valve. Plug lines & cap fittings.
B. Installation
1. Refer to Figure 21-3. Remove caps and plugs, install G019-1 (heater) valve assembly
and connect G391-2 and G391-5 line assembly B-nuts to valve assembly fittings.
Hand-tighten B-nuts at valve assembly, G400-2 muffler assembly, and G396-1 union,
but do not torque.
2. Hinge aft right seat forward. Install clamps, spacers, and hardware securing line
assemblies to aft right keel panel. Verify security. Hinge seat back.
3. Position valve assembly so F621-2 bracket is vertical within 5°; special torque line
assembly B-nuts at valve assembly, muffler assembly, and union, and torque stripe
per Figure 5-1.
4. Perform control rigging per Part C, steps 3 thru 6.
5. Install engine cowling per Section 53-21.
C. Control Rigging
1. Refer to Section 6-70. Remove hardware securing F794-1 and F794-2 (belly cover)
panels and remove panels.
2. Refer to Figure 21-3. Remove palnut and loosen nut securing A462-4 fitting and
A522-14 (heater valve) control inner wire to G019-1 (heater) valve assembly arm.
3. As required, loosen hardware securing AN742-3 clamps and control housing to
F621-2 bracket. Position end of control housing flush-0.25 inch at or beyond edge
of aft clamp and install fasteners. Verify security.
4. Refer to detail in Figure 76-3. Push heater valve knob ON then pull up slightly to
create 0.03-0.10 inch clearance under knob. Position valve assembly arm in full
open detent. Verify sufficient inner wire beyond aft edge of fitting and special
torque fitting nut per Section 20-33.
5. 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.
6. Install (belly cover) panels, and install hardware. Verify security.
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