CESSNA SECTION 3
MODEL 172S NAV III EMERGENCY PROCEDURES
GFC 700 AFCS
U.S.
STATIC SOURCE BLOCKAGE
(ERRONEOUS INSTRUMENT READING SUSPECTED)
1. ALT STATIC AIR Valve - ON (pull full out)
2. Cabin Vents - CLOSED
3. CABIN HT and CABIN AIR Control Knobs - ON (pull full out)
4. Airspeed - Refer to Section 5, Figure 5-1 (Sheet 2) Airspeed
Calibration, Alternate Static Source correction chart.
EXCESSIVE FUEL VAPOR
FUEL FLOW STABILIZATION PROCEDURES
(If flow fluctuations of 1 GPH or more, or power surges
occur.)
1. FUEL PUMP Switch - ON
2. Mixture Control - ADJUST (as necessary for smooth engine
operation)
3. Fuel Selector Valve - SELECT OPPOSITE TANK (if vapor
symptoms continue)
4. FUEL PUMP Switch - OFF (after fuel flow has stabilized)
172SPHBUS-00
3-15
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