Cessna 172R, Operating Handbook

Page: 497 / 500

CESSNA
MODEL 172R
SECTION
9
- SUPPLEMENTS
SUPPLEMENT
22
- FAA APPROVED
Power
is
supplied
to
the 12-volt Cabin Power System from a DC
to
DC power
converter
located in the tailcone of the aircraft. The
power
converter
receives
28 VDC
power
from the "CABIN
LTS/PWR"
circuit breaker located
on
the electrical switch/circuit
breaker panel. By using two small signal pins located in the Cabin
Power
System connector, the power converter will not supply power
to the
Cabin Power
connector when there is nothing
plugged in.
Refer
to 14
CFR
91.21
and Advisory Circular No. 91.21-1()
“Use
of Portable Electronic
Devices Aboard
Aircraft” for further
information
and requirements regarding the use of portable
electronic devices in aircraft.
SECTION 2
LIMITATIONS
The following limitations must be adhered to:
1. The 12 Volt Cabin
Power System is not certified for supplying
power
to
flight-critical communications or navigation devices.
2. Use of the 12
Volt Cabin Power System is prohibited during
takeoff and landing.
3.
Use of the 12 Volt Cabin Power
System is prohibited under
IFR unless the operator of the
aircraft
has
determined
that
the
use of the 12 VDC power supply and the connected portable
electronic device(s) will not cause interference with the
navigation or
communication
systems of the
airplane.
SECTION 3
EMERGENCY PROCEDURES
There is
no
change to
the airplane emergency procedures when
the 12
Volt Cabin Power System is installed. The system is
disabled by unplugging the power or adapter cable from the 12 Volt
Cabin Power System connector.
In the
event
of an alternator
failure,
load shedding of nonessential auxiliary equipment may be
accomplished by simply unplugging equipment from the
connector.
Dec 30/00
S22-5