Cessna SkyHawk SP 172S NAV III 2005 Pilot Operating Handbook page 92

CESSNA
MODEL 172S NAV III
VACUUM SYSTEM FAILURE
SECTION 3
EMERGENCY PROCEDURES
LOW VACUUM ANNUNCIATOR COMES ON
1. Vacuum Indicator (VAC) - CHECK EIS ENGINE page tol
make sure vacuum pointer is in green arc limits.
CAUTION
IF VACUUM POINTER IS OUT OF THE GREEN
ARC DURING FLIGHT OR THE GYRO FLAG IS
SHOWN ON THE STANDBY ATTITUDE
INDICATOR, THE STANDBY ATTITUDE INDICATOR
MUST NOT BE USED FOR ATTITUDE
INFORMATION.
HIGH CARBON MONOXIDE (CO) LEVEL
ANNUNCIATOR
(if installed)
CO LVL HIGH ANNUNCIATOR COMES ON
1. CABIN HT Knob - OFF (push full in)
2. CABIN AIR Knob - ON (pull full out)
3. Cabin Vents - OPEN
4. Cabin Windows - OPEN (163 KIAS maximum windows open
speed)
CO LVL HIGH ANNUNCIATOR REMAINS ON
5. Land as soon as practical.
172SPHAUS-03
U.S. 3-21