Technical data

13773-001
71-60
Page 1
AIR INTAKES
1. DESCRIPTION
This section describes that portion of the power plant which directs mass air flow to the engine.
Induction air enters the engine through a filter mounted on the left, forward side of the engine then flows
into the induction duct assembly mounted center, forward on the engine. The induction duct assembly
employs a flapper valve which, in the case of filter blockage, or induction ice, allows alternate air to enter
the induction duct body via a flexible duct open to the RH cylinder area beneath the baffling of the engine.
The alternate air valve is manually controlled from the cabin by pulling a control knob mounted on the left
side of the center console. From the induction duct body, induction air flows to the throttle body after which
the air is distributed to each cylinder via the intake manifold and separate intake tubes.
2. MAINTENANCE PRACTICES
A. Induction Air Filter (See Figure 71-601)
(1) Removal - Induction Air Filter
(a) Remove castellated nut, washer, cotter pin, and cover plate securing filter to assembly.
(b) Slide filter from assembly and remove from airplane.
(2) Installation - Induction Air Filter
(a) Slide filter onto assembly.
(b) Install cover plate, washer, castellated nut, and cotter pin.
B. Alternate Air Control Cable. (See Figure 71-601)
(1) Removal - Alternate Air Control Cable
(a) Remove engine cowling. (Refer to 71-10)
(b) Remove cotter pin, castellated nut, washers, and bolt securing alternate air control cable
to flapper valve control arm.
(c) Remove nut, washer, bolt, and clamp securing control-cable to induction duct assembly.
(d) Remove nut, washer, bolt, and clamp securing control-cable to #3 cylinder manifold.
(e) Remove nut and washer securing alternate air control knob and cable to console mount-
ing bracket.
Note: Prior to removal, note routing of cable through firewall and console ribs for
aid on reinstallation and remove as much sealant as possible surrounding
cable fitting on firewall.
(f) Gently pull throttle control cable aft, through firewall, ensuring that the control cable does
not inadvertently pull other components loose, and remove from airplane.
(2) Installation - Alternate Air Control Cable
(a) Acquire necessary tools, equipment, and supplies.
(b) Ensure cable fitting on firewall is clear and free of old sealant.
Description P/N or Spec. Supplier Purpose
High Temperature Silicone
Adhesive
RTV 736 Dow Corning Sealant
Fiber Frax 970J,TON-
0146
UniFrax Firewall Insulation
30 Nov 2000