SECTION 7
CESSNA
AIRPLANE AND SYSTEMS DESCRIPTION MODEL
2088 (675 SHP)
ELECTRICAL SYSTEM
(Continued)
VOLTIAMMETER AND SELECTOR SWITCH
A volffammeter and four-position rotary-type selector switch are
mounted on the left side of the instrument panel so that electrical
system operation can be monitored. The selector switch has GEN, ALT,
BATT, and VOLT positions and selects either generator current,
standby alternator current, battery charge or discharge current, or
system voltage, respectively, on the
volffammeter. The ALT position of
the selector switch is used for the standby alternator system which may
not be installed on some airplanes. In that case, the position will be
inoperative. Refer to Standby Electrical System in Section 9 of this
handbook for further details.
ANNUNCIATOR LIGHTS
Six liahts on the annunciator Danel indicate the condition of the
standard electrical system to the'pilot. These lights are GENERATOR
OFF. VOLTAGE LOW. BATTERY OVERHEAT
(if installed). STARTER
ENERGIZED,
BATTERY
HOT (if installed);
IGNITION
ON and
INVERTER
INOP (if installed). These liahts should be observed at all
times during
airblane operation aid if any light illuminates
unexpectedly, a malfunction may have occurred and appropriate action
should be undertaken to correct the problem. For details of other lights
on the annunciator panel, refer to the Annunciator Panel paragraph in
this section.
GROUND SERVICE PLUG RECEPTACLE
A ground service plug receptacle permits the use of an external power
source for cold weather startina and durina lenathv maintenance work
on the electrical and
avionics equipment. Elxternal power control
circuitry is provided to prevent the external power and the battery from
being connected together during starting. The external power
receptacle is installed on the left side of the engine compartment near
the firewall.
The ground
service circuit incorporates polarity reversal and
overvoltaae orotection. Power from the external Dower source will flow
only
if
thegiound serv ce plug 1s correctly connected to the a~rplane If
tne olua 1s acc~dentallv connected backwards or the around servlce
voltage?^
too high, no bower will flow to the electrical system, thereby
preventing any damage to electrical equipment.
1
7-90 U.S. Revision
23
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