Textron Cessna C172S PIM, Pilot Operating Handbook

Page: 144 / 322

SECTION 4 CESSNA
NORMAL PROCEDURES MODEL 172S NAV III
GFC 700 AFCS
U.S.
STARTING ENGINE
(Continued)
RECOMMENDED STARTER DUTY CYCLE
Operate the starter motor for 10 seconds followed by a 20 second cool
down period. This cycle can be repeated two additional times, followed
by a ten minute cool down period before resuming cranking. After cool
down, operate the starter motor again, three cycles of 10 seconds
followed by 20 seconds of cool down. If the engine still does not start,
try to find the cause.
LEANING FOR GROUND OPERATIONS
For all ground operations, after starting the engine and when the
engine is running smoothly:
1. Set the throttle control to 1200 RPM.
2. Lean the mixture for maximum RPM.
3. Set the throttle control to an RPM appropriate for ground
operations (800 to 1000 RPM recommended).
NOTE
If ground operation will be required after the BEFORE
TAKEOFF checklist is completed, lean the mixture again
(as described above) until ready for the TAKEOFF
checklist.
172SPHBUS-00
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