Supplement POH
Cessna 172 R&S
(FAA-Version)
Page 3-9
Issue 3
Revision 2, Mar. 2022
ELECTRICAL FIRE IN FLIGHT
The first sign of an electrical fire is an unmistakable sharp, acrid
smell. As the fire grows, electrical load might be higher than
normal or circuit breakers start to trip. In this event proceed as
follows:
(1) STBY BATT Switch – OFF (G1000 Avionics)
(2) Avionics Master – OFF
(3)
Fresh Air Nozzles, Cabin Heat and Ven
tilation – OFF
(closed)
(4) Fire Extinguisher – Activate (if available)
(5) All electrical consumers – Switch OFF, leave Alternator,
Battery and Engine Master ON
(6) If there is evidence of continued electrical fire, consider
turning off Battery and Alternator.
(7) Fresh Air Nozzles, Cabin Heat and Ventilation – ON (open)
(8) Check Circuit Breaker, do not reset if open
If the fire has been extinguished:
(9) STBY BATT Switch – ON (G1000 Avionics)
(10) Avionics Master – ON
WARNING: After the fire extinguisher has been used,
make sure that the fire is extinguished before
exterior air is used to remove smoke from the
cabin.
WARNING: If the FADEC Backup battery is not installed
this will shut down the engine and require an
emergency landing (refer to “EMERGENCY
LANDING WITH ENGINE OUT”). The engine
has been demonstrated to continue operating
for a maximum of 30 minutes when powered
by the FADEC Backup battery only.
WARNING: Turn on electrical equipment required to
continue flight depending on the situation and
land as soon as possible. Switch circuit
breakers ON one at a time, with delay after
each.
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