Ground Service Plug Receptacle - Cessna 172R Pilot Operating Handbook

GROUND SERVICE PLUG RECEPTACLE
A ground service receptacle plug
is
integral
to the power
distribution module and allows the use of an external power source
for cold weather starting, and during lengthy maintenance work on
electrical and avionics equipment. The receptacle is located on the
left side of the airplane near the firewall. Access to the receptacle is
gained by removing the cover plate.
The ground service plug receptacle incorporates a special fused
plug which will close the battery contactor when external power is
applied with the master switch turned on. This circuit is intended as
a servicing aid when battery power is too low to close the contactor,
and should not be used to avoid performing proper maintenance
procedures on a low battery.
NOTE
If no avionics equipment is to be used or worked on, the
avionics power switch should be turned off. If maintenance
is required on the avionics equipment, it is advisable to
utilize a battery cart external power source to prevent
damage to the avionics equipment by transient voltage. Do
not crank or start the engine with the avionics power switch
turned on.
NOTE
Just before connecting an external power source (generator
type or battery cart), the avionics power switch and the
master switch should be turned off.
If there is any question as to the condition of the battery, the
following check should be made after engine has been started and
external power source has been removed.
Master Switch - - OFF.
Taxi and Landing Light Switches - - ON.
Engine RPM - - REDUCE to idle.
Master Switch - - ON (with taxi and landing lights turned on)
Engine RPM - - INCREASE to approximately 1500 RPM.
Ammeter and Low Voltage Annunciator - - CHECK.
I 7-36
Nov 3/97
SECTION 7 CESSNA
AIRPLANE & SYSTEMS DESCRIPTION
MODEL 172R
- -
- -
- -
- -
- -
- -