CESSNA AIRCRAFT COMPANY FOR TRAINING USE ONLY
MODEL 152 7-26
RATE-OF-CLIMB INDICATOR
The rate-of-climb indicator depicts airplane rate of climb or descent in feet per minute. The pointer is
actuated by atmospheric pressure changes resulting from changes of altitude as supplied by the static
source.
ALTIMETER
Airplane altitude is depicted by a barometric type altimeter. A knob near the lower left portion of the
indicator provides adjustment of the instrument’s barometric scale to the current altimeter setting.
VACUUM SYSTEM AND INSTRUMENTS
An engine-driven vacuum system (see figure 7-9) is available and provides the suction necessary to
operate the attitude indicator and directional indicator. The system consists of a vacuum pump
mounted on the engine, a vacuum relief valve and vacuum system air filter on the aft side of the firewall
below the instrument panel, and instruments (including a suction gage) on the left side of the
instrument panel.
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