Cessna 172 R - ALTERNATOR WARNING LIGHT ILLUMINATES DURING NORMAL ENGINE OPERATION.

Supplement POH
Cessna 172 R&S
(FAA-Version)
Page 3-15
Issue 3
Revision 2, Mar. 2022
ALTERNATOR WARNING LIGHT ILLUMINATES DURING
NORMAL ENGINE OPERATION.
(1) Ammeter – CHECK
(2) Alternator switch CHECK – ON
(3) Battery Switch CHECK – ON
(4) Electrical load – REDUCE IMMEDIATELY as follows:
i) NAV/ COM 2 – OFF
ii) Fuel Pump – OFF
iii) Landing Light – OFF (use as required for land-
ing)
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
(5) The pilot should:
i) Land as soon as possible.
ii) Be prepared for an emergency landing.
iii) Expect an engine failure
 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!