CESSNA SECTION
3
MODEL 2088 (675 SHP) EMERGENCY PROCEDURES
ELECTRICAL POWER SUPPLY SYSTEM
MALFUNCTIONS
(Continued)
STANDBY ELECTRICAL SYSTEM MALFUNCTIONS
An operational check of the standby electrical system is performed by
following the Normal Procedures, Before Takeoff checklist. With the
generator supplying the electrical load and the standby power switch in
the ON position, both the amber annunciators,
STBY ELECT PWR ON
and
STBY ELECTR PWR INOP, should be extinguished. The volff
ammeter should indicate zero amps in the ALT position. If the STBY
ELECT PWR INOP annunciator is illuminated, it indicates that the
alternator has no output. If a line voltage surge or temporary condition
has tripped the ACU (alternator control unit), then cycling the standby
power switch to OFF, then back ON, may reset the ACU and restore
standby power.
If, due to a power system malfunction, the standby electrical system is
carrying part of the electrical load (more than
10
amps), the STBY
ELECT PWR ON annunciator will be illuminated and the voltlammeter
(in ALT position) will indicate the amount of current being supplied by
the standby electrical system.
To attempt to restore main power, refer to the Section
3
emergency
procedures for Loss Of Electrical Power. If this attempt is successful,
the standby electrical system will revert to its normal no-load condition
and the
STBY ELECT PWR ON annunciator will extinguish. If main
electrical power cannot be restored, reduce nonessential loads as
necessary to remain within the 75-amp capability of the standby
electrical system. Loads in excess of this capability will be indicated by
illumination of the VOLTAGE LOW annunciator and the
volffammeter
showing discharge current (in the BATT position).
*
--
1
Revision
23
3
U.S.
3-43
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