Starting Engine - Cessna 172S Nav III Information Manual

CESSNA SECTION 4
_ MODEL 172S NAV III NORMAL PROCEDURES
PREFLIGHT INSPECTION (Continued)
If the airplane has been stored outside in windy or gusty areas, or
tied down adjacent to taxiing airplanes, special attention should be
paid to control surface stops, hinges, and brackets to detect the
presence of potential wind damage.
If the airplane has been operated from muddy fields or in snow or
— slush, check the main and nose gear wheel fairings for obstructions
and cleanliness. Operation from a gravel or cinder field will require
extra attention to propeller tips and abrasion on leading edges of the
horizontal tail. Stone damage to the propeller can seriously reduce
the fatigue life of the blades.
Airplanes that are operated from rough fields, especially at high
— altitudes, are subjected to abnormal landing gear abuse. Frequently
check all components of the landing gear, shock strut, tires, and
brakes. If the shock strut is insufficiently extended, undue landing
_ and taxi loads will be subjected on the airplane structure.
To prevent loss of fuel in flight, make sure the fuel tank filler caps
are tightly sealed after any fuel system check or servicing. Fuel
_ system vents should also be inspected for obstructions, ice or water,
especially after exposure to cold, wet weather.
STARTING ENGINE
In cooler weather, the engine compartment temperature drops off
rapidly following engine shutdown and the injector nozzle lines
^ remain nearly full of fuel.
In warmer weather, engine compartment temperatures may increase
rapidly following engine shutdown, and fuel in the lines will vaporize
and escape into the intake manifold. Hot weather starting
procedures depend considerably on how soon the next engine start
is attempted. Within the first 20 to 30 minutes after shutdown, the
w fuel manifold is adequately primed and the empty injector nozzle
lines will fill before the engine dies. However, after approximately
30 minutes, the vaporized fuel in the manifold will have nearly
dissipated and some slight "priming" could be required to refill the
nozzle lines and keep the engine running after the initial start.
Starting a hot engine is facilitated by advancing the mixture control
promptly to 1/3 open when the engine starts, and then smoothly to
full rich as power develops.
(Continued Next Page)
I172SPHAUS-03 U.S. 4-25