Cessna 172S Pilot Operating Handbook page 219

C ESSNA
MODEL 1 728
DIGITA L C LOCKIOATNOLT I N D I CATOR
The Astrotech Model TC-2 digital clock combines the features of
a clock, outside air temperature gauge (OAT) and voltmeter in a
single unit. The unit is designed for ease of operation with a four
button control system.
sequencing between temperature and voltage.
buttons control reading and timing functions related to the digital
clock. Temperature and voltage functions are displayed in the
upper portion of the unit ' s LCD window, and clock/timing functions
are displayed in the lower portion of the unit's LCD window.
The digital display features an internal light (back light) to ensure
good visibility under low cabin lighting conditions and at n ight. The
intensity of the back light is controlled by the PAN EL LT rheostat.
Jan 3 1 /02
S UPPLEMENT 24 - FAA APPROVED
S U P P L E M ENT
SECTION 1
GEN ERAL
The upper button is used to control
S ECTION 9 S UPPLEMENTS
-
The lower three
S24-3