Supplement POH
Cessna 172 R&S
(FAA-Version)
Page 3-13
Issue 3
Revision 2, Mar. 2022
ELECTRICAL POWER SUPPLY SYSTEM MALFUNCTIONS
WARNING: If the power supply from both alternator and
main battery is interrupted, continued engine
operation is dependent on the remaining
capacity of the FADEC backup battery. The
engine has been demonstrated to continue
operating for a maximum of 30 minutes when
powered by the FADEC backup battery only.
In this case, all electrical equipment will not
operate:
- land immidiately
- do not switch the „FORCE-B“ switch, this
will shut down the engine
CAUTION: The engine requires an electrical power
source for its operation. If the alternator fails,
continued engine operation time is dependent
upon the remaining capacity of the main
battery, the FADEC backup battery and
equipment powered.
The engine has been demonstrated to
continue operating for approximately 120
minutes based upon the following
assumptions:
CAUTION: This table only gives a reference point. The
pilot should turn off all nonessential items and
supply power only to equipment which is
absolutely necessary for continued flight
depending upon the situation.
Deviating from this recommendation, the
remaining engine operating time may change.
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