Cessna 172S Nav III Information Manual

SECTION 4 CESSNA
NORMAL PROCEDURES MODEL 172S NAV III
(CRUISE (Continued)
FUEL VAPOR PROCEDURES
The engine fuel system can cause fuel vapor formation on the
ground during warm weather. This will generally occur when the
outside ambient air temperature is above 80~F. Vapor formation
may increase when the engine fuel flows are lower at idle and taxi
engine speeds. The following procedures are recommended when
I engine idle speed and fuel flow fluctuations show that fuel vapor
may be present:
1. With the mixture full rich, set the throttle at 1800 RPM to 2000
RPM. Maintain this power setting for 1 to 2 minutes or until
smooth engine operation returns.
2. Retard the throttle to idle to verify normal engine operation.
3. Advance the throttle to 1200 RPM and lean the mixture as
described under FUEL SAVINGS PROCEDURES FOR
FLIGHT TRAINING OPERATIONS.
4. In addition to the above procedures, the Auxiliary Fuel Pump
may be turned ON with the mixture adjusted as required to aid
vapor suppression during ground operations. The Auxiliary
Fuel Pump should be turned OFF prior to takeoff.
| 5. Just prior to TAKEOFF, apply full throttle, for approximately 10
seconds to verify smooth engine operation for takeoff.
NOTE
When the engine is operated above 1800 RPM, the
resulting increased fuel flow also makes for lower
fuel temperatures throughout the engine fuel system.
This increased flow purges the fuel vapor and the
cooler fuel minimizes vapor formation.
(Continued Next Page)
14-38 U.S. 172SPHAUS-03

Cessna 172S Nav III Specifications

General

Manufacturer	Cessna
Model	172S Nav III
Engine	Lycoming IO-360-L2A
Horsepower	180 hp
Cruise Speed	124 knots (143 mph, 230 km/h)
Service Ceiling	13, 500 ft (4, 115 m)
Takeoff Distance (Ground Roll)	960 ft (293 m)
Landing Distance (Ground Roll)	575 ft (175 m)
Seating Capacity	4
Type	Single-engine, high-wing
Propeller	2-blade, constant-speed
Fuel Capacity	56 gallons
Wingspan	36 ft 1 in
Length	27 ft 2 in
Height	8 ft 11 in
Stall Speed	47 knots
Range	640 nautical miles
Rate of Climb	720 ft/min (3.7 m/s)
Avionics	Garmin G1000
Maximum Takeoff Weight	2, 550 lbs (1, 157 kg)