Cessna 177 SERIES Service Manual

Removal and
Installation
Removal and Installation of
Beginning with 1971
Models) .... 2D5/16-27
Lithium Four Cell Battery
Pitot Heater ....................... 2D5/16-27
Pack ..........................
2D12/16-34
Description . ................... 2D5/16-27 "G" Switch Operational Check ........ 2D13/16-35
Cigar Lighter
. ..................... 2D9/16-31
Trouble Shooting . ............ 2D13/16-35
Description
..................... 2D9/16-31
Emergency Locator Transmitter
Removal and Installation
.......... 2D9'16-31 (Beginning
with 1978 Models) ....... 2D15/16-37
Emergency Locator Transmitter
Description ...................
2D15/16-37
(Thru 1977 Models) ................ 2D10/16-32 Operation ........................ 2D15/16-37
Description ......................
2D10/16-32 Checkout
Interval ................ 2D15/16-37
Operation ........................ 2D10/16-32 Removal and Installation of
Checkout Interval
................ 2D10/16-32
Transmitter .................... 2D15/16-37
Removal
and Installation of
Removal and Installation
of
Transmitter ............... ..... 2D12/16-34
Antenna .......................
2D15/16-37
Removal and Installation of
Removal
and Installation of
Antenna ......................
2D12/16-34 Battery
Pack ................. 2D15/16-37
Removal and Installation
of "G"
Switch Operational Check ........ 2D17/16-39
|
Magnesium
Six Cell Battery
Trouble Shooting .................
2D17/16-39
Pack .......................... 2D12/16-34
Electrical Load Analysis Chart
....... 2D19/16-41
16-1
ELECTRICAL SYSTEMS.
16-8. DESCRIPTION. A power relay
is installed
behind the instrument panel on all aircraft utilizing
16-2. General.
This section contains
service
in-
a split bus bar.
The relay is a normally
closed type,
formation
necessary to maintain the Aircraft Electri-
opening when external power is connected
or when
cal Power Supply
System, Battery and External Pow- the
starter is engaged, thus removing battery from
the
er Supply System, Aircraft Lighting System, Pitot electronic side of the split bus bar and pre-
Heater, Cigar Lighter and Electrical Load Analysis. venting transient voltages from damaging the elec-
tronic installations. (See figure 16-1.)
16-3.
ELECTRICAL POWER
SUPPLY SYSTEM.
16-9. MASTER SWITCH.
16-4.
DESCRIPTION.
Electrical
energy
for the
air-
craft is supplied by a 14-volt, direct current, single- 16-10. DESCRIPTION. The operation of the battery
wire,
negative
ground
electrical
system.
A
single
and alternator
system
is controlled
by a
master
12-volt battery supplies power for
starting, and furn- switch. On models
prior to 1970 the switch is a rock-
ishes a reserve
source of power in the event of alter-
er type with double-ploe, single-throw contacts.
The
nator failure thru 1977 models. Beginning with 1978 switch, when operated, connects the battery contactor
models the electrical system is 28-volt and a 24-volt coil to ground and the alternator field circuit to the
battery is utilized. An engine-driven alternator is the battery, activating the power systems. On 1970
normal source of power during flight and maintains a models and on, a new master switch is utilized.
battery charge controlled
by a voltage regulator. An This switch
is an inter-locking split rocker with the
external power receptacle is offered as optional equip- battery mode on the right hand side and the alternator
ment to supplement the battery system for starting mode on the left hand side. This arrangement allows
and ground operations. the battery to be on the line without the alternator,
however, operation of the alternator without the bat-
16-5. SPLIT BUS BAR.
tery on the line is not possible.
The switch is la-
beled "BAT" and "ALT" above the switch, and is lo-
16-6. DESCRIPTION .Electrical power is supplied cated on the left hand side of the switch panel.
through a split bus bar. One side of the bus bar sup
plies puwer to the electrical equipment while the other 16-11. AMMETER.
side supplies the electronic installations. When the
master switch is closed, the battery contactor en- 16-12. DESCRIPTION. The ammeter is connected
gages and the battery power is supplied to the electri- between the battery and the aircraft bus. The meter
cal side of the split bus bar. The electrical bus feeds indicates the amount of current flowing either to or
battery power thru a relay, thru 1977 models and an from the battery. With low battery and the engine
avionics master switch beginning with 1978 models, operating at cruise speed, the ammeter will show the
to the electronic bus. full alternator output. When the battery is fully
charged and cruise
is maintained with all
electrical
16-7. SPLIT BUS POWER
RELAY.
equipment
off, the ammeter will
show a minimum
charging rate.
16-2
Change
8

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)