Supplement POH
Cessna 172 R&S
(FAA-Version)
Page 3-17
Issue 3
Revision 2, Mar. 2022
TOTAL ELECTRICAL FAILURE
(all equipment inoperative, except engine)
(1) Alternator switch CHECK – ON
(2) Battery Switch CHECK – ON
(3) Land as soon as possible
i) Be prepared for an emergency landing
ii) Expect an engine failure
WARNING: If both alternator and main battery fail, con-
tinued 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 other electrical equipment will not
operate.
WARNING: If the aircraft was operated on battery
power only until this point (alternator
warning light illuminated), the remaining
engine operating time may be less than 30
minutes.
WARNING: Do not activate the FORCE-B switch, this
will shut down the engine.
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