CESSNA SECTION 7
MODEL
2088
(675 SHP) AIRPLANE AND SYSTEMS DESCRIPTION
VACUUM SYSTEM AND INSTRUMENTS
(Continued)
VACUUM-LOW WARNING ANNUNCIATOR
A red vacuum-low warning
annunciator
s installed on the annunc ator
panel to warn the pilot of a possible low-vacuum condition existing in
the vacuum system.
Illumination of the annunciator warns the pild to
check the suction gage and to be alert for possible erroneous
vacuum-
driven gyro instrument indications. The annunciator is illuminated by
operation of a warning switch which is activated anytime suction is less
than approximately 3.0 in. Hg.
OUTSIDE AIR TEMPERATURE (OAT) GAGE
An outside air temperature (OAT) gage is installed in the upper left side
of the windshield. The gage is calibrated in degrees Fahrenheit and
Celsius.
STALL WARNING SYSTEM
The airplane is equipped with a vane-type stall warning unit, in the
leading edge of the left wing, which is electrically connected to a stall
warning horn located overhead of the pilot's position. The vane in the
wing senses the change in
airflow over the wing, and operates the
warning horn at airspeeds between
5
and
10
knots above the stall in all
configurations.
The stall warning system should be checked during the preflight
inspection by momentarily turning on the battery switch and actuating
the vane in the wing. The system is operational if the warning horn
sounds as the vane is pushed upward. Aircraft equipped with a stall
warning ground disconnect switch will require that the elevator be off
the forward stop before the stall warning horn is enabled.
A "pull-off' type circuit breaker, labeled STALL WRN, protects the stall
warning system. Also, it is provided to shut off the warning horn in the
event it should stick in the on position.
(Continued Next Page)
U.S.
7-109
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