Supplement POH
Cessna 172 R&S
(FAA-Version)
Page 3-16
Issue 3
Revision 2, Mar. 2022
AMMETER SHOWS BATTERY DISCHARGE DURING
NORMAL ENGINE OPERATION FOR MORE THAN
5 MINUTES
(1) Alternator switch CHECK – ON
(2) Battery Switch CHECK – ON
(3) Electrical load – REDUCE IMMEDIATELY as follows:
i) NAV/ COM 2 – OFF
ii) Fuel Pump – OFF
iii) Landing Light – OFF (use as required for
landing)
iv) Taxi Light – OFF
v) Strobe Light – OFF
vi) Nav Lights – OFF
vii)Beacon – OFF
viii)Interior Lights – OFF
ix) Intercom – OFF
x) Pitot Heat – OFF (use as required)
xi) Autopilot – OFF
xii)Non-essential equipment – OFF
(4) The pilot should:
i) Land as soon as possible
ii) Be prepared for an emergency landing
iii) Expect an engine failure
Note: When the AED Ammeter indication
decreases to the far left and the voltage
indication is decreasing simultaneously, the
battery is being discharged.
CAUTION: If the FADEC was supplied by battery only
until this point, the RPM can momentarily
drop, when the alternator is switched on. In
any case: leave the alternator switched ON!
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