Cessna 1973 172 - Taxiing and Engine Start Procedures

engine) it will not fire at all, and additional priming will be necessary.
As soon as the cylinders begin to fire, open the throttle slightly to keep
it running.
After starting, if the oil gage does not begin to show pressure within
30 seconds in the summertime and about twice that long in very cold
weather, stop engine and investigate. Lack of oil pressure can cause
serious engine damage. After starting, avoid the use of carburetor
heat unless icing conditions prevail.
NOTE
Additional details for cold weather starting and operation
may be foimd under Cold Weather Operation in this section.
TAXIING.
When taxiing, it is important that speed and use of brakes be held to
a minimum and that all controls be utilized (see Taxiing Diagram, figure
2-4) to maintain directional control and balance.
The carburetor heat control knob should be pushed full in durir^ all
ground operations unless heat is absolutely necessary. When the knob is
pulled out to the heat position, air entering the engine is not filtered.
Taxiing over loose gravel or cinders should be done at low engine
speed to avoid abrasion and stone damage to the propeller tips.
BEFORE TAKE-OFF.
WARM-UP.
If the engine accelerates smoothly, the aircraft is ready for take-off.
Since the engine is closely cowled for efficient in-flight engine cooling,
precautions should be taken to avoid overheating during prolonged engine
operation on the ground. Also, long periods of idling may cause fouled
spark plugs.
MAGNETO CHECK.
The magneto check should be made at 1700 RPM as follows. Move
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