SECTION
7..
..'
,
, AIRPLANE & SYSTEMS DESCRIPTION
CESSNA
MODEL 172S
I
EXTERNAL
POWER RECEPTACLE"
"
"~'
i
'An external power receptacle'is integral to the power distribution
module and allows the use of an external electrical power source'for
cold weather sta[ling" and' during lengthy maintenance work, on
electrical and avionics equipment:.'The receptacle is located on the
I
leftside of the .engine cowling, just forward of the firewall and,
midway up the ,side. . Access to the, receptacle isgainl3d
by
removing the covet plate '(earlier serial number airplanes) or,
opening the hinged accessdoor (Iate(serial:numb!lr ':Iirplanes),
"
The power' distribution module (J-Box): incorporates a circuit
which will close the ':battery contactor when 'external
power is
applied through the ground service plug receptacle with the master
switch' turned on. This feature' 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 mai'ntenance procedures ona low
battery.
.
NOTE
I
I
I
7-36
, • If no avionics equipment is to be used or serviced,
the avionics master switch should be in the OFF
position. If maintenance is required on the avionics
equipment, use a regulated external power source
to prevent damage to the avionics equipment by
transient voltage. Do not crank or start the engine
with the avionics master switch in the ON position.
• Before. connecting an", external power source'
j
(generator type or batteiy cart), the avionics master
•.
switch and the master switch should be turned off,
, Revision 4
Содержание Cessna 172S Skyhawk SP
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