Cessna 177 SERIES Service Manual

16-13.
BATTERY
POWER
SYSTEM.
imately
33 ampere
hour
capacity.
The
battery
is
mounted
in the
tailcone and
is equipped
with non-spill
16-14.
BATTERY.
filler
caps.
Since
the same
battery
box is
used
for
both
batteries,
a spacer
is utilized
to
fill the
unused
16-15.
DESCRIPTION.
Thru
1977
models
the battery
portion
of the
battery
box when
the smaller
standard
furnished
as standard
equipment,
is 12-volt
and is
battery
is installed.
Beginning
with
1978
models
a
approximately
25
ampere-hour
capacity.
A larger
24-volt
battery
is installed.
This
battery
has an
heavy
duty battery
is offered
as
optional
equipment.
approximate
17 ampere
hour
capacity.
The heavy
duty battery
is also
12-volt
but is
approx-
16-16.
TROUBLE
SHOOTING
THE
BATTERY
POWER
SYSTEM
TROUBLE
PROBABLE
CAUSE
REMEDY
BATTERY
WILL
NOT
SUPPLY
Battery
discharged.
1.
Measure
voltage
at "BAT"
POWER
TO
BUS OR IS
INCAP-
terminal
of battery
contactor
ABLE
OF
CRANKING
ENGNE.
with
master
switch
and
a suit-
able
load
such as
a taxi
light
turned
on.
Normal
battery
will
indicate 11.5
volts or more
on
a 14 volt
system
or
23 volts
or
more
on a 28
volt system.
If
voltage is
low proceed
to step
2. If
voltage
is normal,
pro-
ceed to
step
3.
Battery
faulty.
2.
Check
fliud
level
in
cells
and charge
12-volt
battery
at
14 volts
or
24-volt
battery
at
28 volts for
approximately
30
minutes
or until
battery
voltage
rises to
14 volts on
12-volt bat-
tery
or
28 volts
on 24-volt
bat-
tery.
If tester
indicates
a good
battery,
the
malfunction
may
be
assumed
to be
a discharged
bat-
tery.
If the
tester
indicates
a
faulty
battery,
replace
the
battery.
Faulty
contactor
or wiring
3. Measure
voltage
at master
between
contactor
or
master
switch terminal
(smallest)
on
switch.
contactor
with master
switch
closed.
Normal
indication is
zero volts.
If voltage
reads
zero,
proceed
to step 4.
If a
voltage
reading is
obtained
check
wiring between
contactor
and
master switch.
Also check
master switch.
Open
coil on contactor.
4. Check continuity between
"BAT"
terminal and
master switch
termin-
al of contactor.
Normal indication
on
14 volt aircraft
is 16-24 ohms.
Normal indication
on 28
volt air-
craft
is 50-70 ohms.
If ohmmeter
indicates
an open
coil, replace
con-
tactor. If ohmmeter
indicates
a
good
coil,
proceed
to
step
5.
16-4
Change
7

Cessna 177 SERIES Specifications

General

Manufacturer	Cessna
Engine Type	Piston
Wingspan	35 ft 6 in (10.82 m)
Seating Capacity	4
Number Built	4, 295
Engine	Lycoming O-360
Horsepower	180 hp
Maximum Takeoff Weight	2, 500 lb (1, 134 kg)