Cessna 172 R - ABNORMAL ENGINE BEHAVIOR

Supplement POH
Cessna 172 R&S
(FAA-Version)
Page 3-7
Issue 3
Revision 2, Mar. 2022
ABNORMAL ENGINE BEHAVIOR
If the engine acts abnormal during flight and the system does
not automatically switch to the B-FADEC, it is possible switch to
the B-FADEC manually.
(1) Select an appropriate airspeed to avoid engine overspeed.
(2) "Force-B" switch to B-FADEC
(3) Flight may be continued, but the pilot should:
i) Select an airspeed to avoid engine overspeed
ii) Land as soon as possible
iii) Be prepared for an emergency landing
 WARNING: It is only possible to switch from the
automatic position to B-FADEC (A-FADEC
is active in normal operation, B-FADEC is
active in case of malfunction). This only
becomes necessary when no automatic
switching occurred in case of abnormal
engine behavior.
 WARNING: When operating on FADEC backup battery
only, the "Force B" switch MUST NOT BE
activated. This will shut down the engine.