Rockwell Commander 112 - Alternate Air Control; Engine Accessories; Mixture Control; Propeller Control

Rockwell Commander 112

293 pages

Save Page as PDF

To Next Page

To Next Page

To Previous Page

To Previous Page

Loading...

SECTION

IV

POWER PLANT

AND

PROPELLER

MAINTENANCE

MANUAL

ROCKWELL

COMMANDER

112/B/TC

/TCA

it

reaches

opposite

end

stop.

g.

If

required,

make

minor

aqjustments

at

throttle

control

lever

until

it

aligns

with

other

control

levers

at

full

forward

position

with a

0.03

inch

clearance.

MODELS

112TC/TCA.

RIGGING.

The

procedure

for

rigging the

throttle

control

cable

is

as

follows:

a.

Secure

throttle

control

cable

clevis

ends

to

carburetor

and

turbocharger

wastegate

on

engine.

b.

Secure

throttle

control

cable

ball

joint

to

throttle

lever

in

control

quadrant.

c . Move

throttle

control

lever

through

full

range

of

travel.

Check

lever

hits

both end

stops.

d.

Move

throttle

control

lever

to full

forward

stop

less

0.03

inch

clearance.

e.

Adjust

clevis

ends

on

throttle

and

wastegate

so

throttle

and

wastegate

contact

stops

simultaneously.

f.

Adjust

ball

joint

at

throttle

control

lever

until

it

contacts

forward

end

stop.

g.

Move

throttle

control

lever

aft

and

ascertain

it

reaches

opposite

end

stop.

h.

If

required

make

minor

adjustments

at

throttle

control

lever

until

it

aligns

with

other

control

levers

at

full

forward

pOSition with a

0.03

inch

clearance.

MIXTURE CONTROL

MODELS

112/B.

The

mixture

control

lever

is

mounted

on the

right

side

of the engine

control

quadrant.

The

RICH

pOSition of the

mixture

control

lever

is

used

for

starting,

takeoff,

landing,

and

most

ground

ope-

rations.

LEAN

is

used

for

stopping the engine. The

range

between RICH

and

LEAN

permits

manual

lean-

ing of the fuel

mixture

to

obtain

best

power

and

min-

imum

fuel

consumption

during

flight. A fuel flow

gage

registers

the

amount

of

metered

fuel going to

the engine

and

aids

in

determining

the

proper

mixture

control

setting.

MODELS

112TC/TCA.

The

mixture

control

lever

is

mounted on the

right

side

of

the

engine

control

quadrant

0

The

RICH

position

of the

mixture

control

lever

is

used

for

starting,

takeoff,

landing,

and

most

ground

opera-

tions.

LEAN

is

used

for

stopping

the

engine.

The

range

between RICH and LEAN

permits

manual

lean-

ing

of the fuel

mixture

to

obtain

best

power

and

min-

imum

fuel

consumption

during

flight.

RIGGING.

The

procedure

for

rigging

the

mixture

control

cable

is

the

same

as

the

throttle

control

cable

rigging.

PROPELLER

CONTROL

The

propeller

control

lever

is

located

between

the

throttle

and

mixture

control

levers

and

is

distinguish-

ed by

rectangular

grooved

knobs.

The

control

lever

is

mechanically

linked to a

propeller

governor

and

controls

engine

rpm

and

propeller

pitch

by

altering

the

propeller

governor

setting.

Forward

movement

of

the

control

lever

decreases

propeller

pitch and

4-18

increases

engine

rpm,

and

aft

movement

increases

pitch

and

decreases

rpm.

Retarding

the

control

lever

into

the

LO

position

reduces

oil

pressure

to

the

pro-

peller,

allowing

centrifugal

force

of the

propeller

and

compressed

springs

to

reduce

propeller

pitch.

RIGGING. The

procedure

for

rigging

the

propeller

control

cable

is

the

same

as

the

throttle

control

cable

rigging.

ALTERNATE

AIR

CONTROL

MODELS

112/B.

Induction

air

is

controlled

by the

for-

ward

and

aft

movement

of

the

alternate

air

control,

located

on the engine

control

quadrant.

Placing

the

control

lever

in

forward

(COLD)

position

allows

filtered

ram

air

to

enter

the

system.

This

ram

air

is

directed

to the induction

air

box

and

then

on into

the

servo

regulator

for

the

fuel/air

mixing

process.

Placing

the

control

lever

in

the

aft

(HOT) pOSition

closes

the

ram

air

source

and

opens

the

hot

air

source.

The

hot

air

is

provided

in

the

event

of fuel

injector

nozzle

impact

icing

or

icing

of the

external

filter

element.

MODELS

112TC/TCA.

Induction

air

is

controlled

by

the

forward

and

aft

movement

of

the

alternate

air

con-

trol,

located

on

the

engine

control

quadrant.

Placing

the

control

lever

in

forward

(COLD) pOsition

allows

filtered

ram

air

to

enter

the

system.

This

ram

air

is

directed

to

the

induction

air

box

and

then

on

into

the

turbocharger

and

carburetor

for

the

fuel/air

mixing

process.

Placing

the

control

lever

in

the

aft (HOT)

pOSition

closes

the

ram

air

source

and

opens

the

hot

air

source.

The

hot

air

is

provided

in

the

event

of

carburetor

icing

or

icing

of

the

external

filter

element.

RIGGING.

The

procedure

for

rigging

the

alternate

air

control

cable

is

the

same

as

the

throttle

control

cable

rigging.

ENGINE ACCESSORIES

STARTER

A

Bendix-type

starter

is

installed

on

the

forward

lower

left

side

of the engine.

The

starter

drive

pin-

ion

engages

the engine flywheel

ring

gear

to

provide

direct

cranking

of the engine.

The

starter

contactor

installed

on the

battery

box

in

the

tailcone,

is

ener-

gized

by

a key

operated,

spring-loaded,

ignition-

starter

switch.

When

starting

the

engine, avoid

en-

ergizing

the

starter

for

more

than

30

seconds,

and

allow

several

minutes

for

the

starter

unit

to

cool

be-

tween

starting

attempts.

INSPECTION

AND

REPAIR.

Before

removing

any

unit

in

a

starting

circuit,

it

should

be

first

determined

where

the

fault

lies

within

the

circuit.

Check

that

the

battery

is

fully

charged

and

inspect

the

wiring

for

Copyright Commander Owners Group 2013 All Rights Reserved

**unofficial copy**

Table of Contents