CESSNA SECTION 3
MODEL 172S NAV III EMERGENCY PROCEDURES
GFC 700 AFCS
U.S.
VACUUM SYSTEM FAILURE
LOW VACUUM ANNUNCIATOR COMES ON
1. Vacuum Indicator (VAC) - CHECK EIS ENGINE PAGE (make
sure vacuum pointer is in green band limits)
IF VACUUM POINTER IS OUT OF THE GREEN BAND
DURING FLIGHT OR THE GYRO FLAG IS SHOWN ON
THE STANDBY ATTITUDE INDICATOR, THE STANDBY
ATTITUDE INDICATOR MUST NOT BE USED FOR
ATTITUDE INFORMATION.
172SPHBUS-01
3-23
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