Cub Crafters CC11-100 Pilot Operating Handbook page 95

CUB CRAFTERS
CC11-100

Switch to the right magneto, noting the rpm, and
turn back to both.
The drop should not exceed 150 rpm on either magneto
or show greater than a 75 rpm difference between
magnetos. The engine should run smoothly on either
magneto. If there is no drop in rpm, there may be a fault
in the system and it should be checked. Do not run the
engine on one magneto for longer than 10 seconds. If
both magnetos are switched off while the engine is
running, do not turn them back on. Cut the mixture and
re-start the engine. If the magnetos are turned back on
while the engine is running, damage may be done to the
exhaust system and the engine should be inspected prior
to flight.
Apply the carburetor heat to be sure that it is operating.
You will note a drop of about 50 to 75 rpm when it is
applied. This will also clear any ice that may have formed
during taxiing. Bear in mind that when the carburetor heat
is applied, unfiltered air is entering the engine. Therefore,
its use on the ground should be kept to a minimum.
The presence of ice may be recognized by the fact that
the engine may momentarily run roughly when the
carburetor heat is applied. This may be followed by an
increase in rpm. When the carburetor heat is removed,
the rpm may increase beyond 1700 rpm.
Check all engine parameters. Apply an electrical load (for
example, by switching on the landing light) and observe
that there is an increase in the electrical current drawn
from the alternator (if an ammeter is installed).
Retard the throttle to idle to verify that the engine runs
smoothly at minimum rpm (at least 600 rpm). Advance it
to 1000 rpm.
Issued: 08/01/06
Date of Revision: 11/23/18
NORMAL PROCEDURES
REPORT SC10000AFM
Page Number 4-21
SECTION 4