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CESSNA
SECTION
7
MODEL 152
AIRPLANE & SYSTEMS
DESCRIPTIONS
1 July 1978
7-24
Normally, both sides of the master switch should be used simultaneously; however, the BAT
side of the switch could be turned ON separately to check equipment while on the ground.
The ALT side of the switch, when placed in the OFF position, removes the alternator from the
electrical system. With this switch in the OFF position, the entire electrical load is placed on
the battery. Continued operation with the alternator switch in the OFF position will reduce
battery power low enough to open the battery contactor, remove power from the alternator
field, and prevent alternator restart.
AMMETER
The ammeter, located on the upper right side of the instrument panel, indicates the flow of
current, in amperes, from the alternator to the battery or from the battery to the airplane
electrical system. When the engine is operating and the master switch is turned on, the
ammeter indicates the charging rate applied to the battery. In the event the alternator is not
functioning or the electrical load exceeds the output of the alternator, the ammeter indicates
the battery discharge rate.
ALTERNATOR CONTROL UNIT AND LOW-VOLTAGE WARNING LIGHT
The airplane is equipped with a combination alternator regulator high-low voltage control unit
mounted on the engine side of the firewall and a red warning light, labeled LOW VOLTAGE,
under the ammeter on the instrument panel.
In the event an over-voltage condition occurs, the alternator control unit automatically removes
alternator field current which shuts down the alternator. The battery will then supply system
current as shown by a discharge rate on the ammeter. Under these conditions, depending on
electrical system load, the low-voltage warning light will illuminate when system voltage drops
below normal. The alternator control unit may be reset by turning the master switch off and
back on again. If the warning light does not illuminate, normal alternator charging has
resumed; however, if the light does illuminate again, a malfunction has occurred, and the flight
should be terminated as soon as practicable.
NOTE
Illumination of the low-voltage light and ammeter discharge indications
may occur during low RPM conditions with an electrical load on the
system, such as during a low RPM taxi. Under these conditions, the light
will go out at higher RPM. The master switch need not be recycled since
an over-voltage condition has not occurred to de-activate the alternator
system.
Содержание 152 1979
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Страница 82: ...CESSNA SECTION 6 MODEL 152 WEIGHT BALANCE EQUIPMENT LIST 1 July 1978 6 2 ...
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