Technical data

13773-001
21-60
Page 4 30 Nov 2000
B. Heat Box Control Cable
(1) Removal - Heat Box Control Cable
(a) Remove engine cowling to gain access to heat box cable. (Refer to 71-10)
(b) Solvent clean adhesive (with alcohol) from cable pass-through on the forward side of the
firewall. (Refer to 20-30)
(c) Loosen lower cable stop bolt from heat box actuation arm.
(d) Loosen cable stop bolt from the inner core wire. Slide cable stop off heater cable core
wire.
(e) Loosen clamp fastened to angle bracket and engine mount. Slide cable out of clamp.
(f) Remove MFD. (Refer to 34-40)
(g) Remove co-pilot kick plate. (Refer to 25-10)
(h) Remove adhesive from cable pass-through on aft side of firewall.
(i) Remove the bolt, washers, and nut securing core wire to the linkage shaft.
(j) Remove bolt, washers, and nut securing the cable and clamp to the cable bracket.
Remove clamp.
(k) Pull heat box cable, cable stop, and Fiber Frax paper out of the cable pass-through.
(2) Installation - Heat Box Control Cable
(a) Acquire necessary tools, equipment, and supplies.
(b) Insert the heat box cable (wrapped with Fiber Frax) through cable pass-through and into
position. (Refer to 20-10)
(c) Slide cable through the clamp mounted to the angle bracket and engine mount.
Note: Make sure clamp is positioned properly and that the controls do not inter-
fere with any other components.
(d) Secure cable and clamp to the angle bracket.
(e) Slide lower cable stop over the inner core wire.
(f) Secure the lower cable stop bolt and inner core wire to the heat box actuation arm.
(g) Apply silicone adhesive over entire cable pass-through on both sides of firewall. (Refer to
20-10)
(h) Secure cable to linkage shaft with bolt, washers, and nut.
(i) Wrap clamp around upper end of the heat box control cable.
(j) Tighten bolt, washers, and nut to secure cable and clamp to the cable bracket.
(k) Adjust and secure the inner core wire cable stop. (Refer to 21-60)
Description P/N or Spec. Supplier Purpose
Fiber Frax paper 1/8” 970J, TON0146 UniFrax Firewall insulation
Dow Corning Silicone
Sealant
RTV 736 Any Source Provide air-tight
seal between cabin
and engine com-
partment
Isopropyl Alcohol TT-I-735 Isopro-
pyl Alcohol,
Grade A or
Grade B
Any Source Clean cable pass-
through free of
adhesive