Cessna 172R Pilot Operating Handbook page 329

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SUPPLEMENT
DIGITAL CLOCKJO.A.T.
SECTION 1
GENERAL
The Davtron Model 803 digital clock combines the features of a
clock, outside air temperature gauge (0.A.T.) and voltmeter in
a
single unit. The unit is designed for ease of operation with the
use
of three buttons. The upper button is used to control sequencing
between temperature and voltage. The lower two 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
night. The intensity of the back light is controlled by the PANEL LT
rheostat. In addition, the display incorporates a test function which
allows checking that all elements of the display are operating.
SECTION 2
LIMITATIONS
There is no change to the airplane limitations when the digital
clock/O.A.T. is installed.
SECTION 3
EMERGENCY PROCEDURES
There is no change to the airplane emergency procedures when
the digital clock/O.A.T, is installed.
Feb 28/97
S9-3
CESSNA
SECTION 9 - SUPPLEMENTS
MODEL 172R
SUPPLEMENT 9 - FAA APPROVED