SECTION III CHEROKEE "E"
ground.
2. The best speed for take-off is about 60 MPH under normal
conditions. Trying to pull the airplane off the ground at too low
an airspeed decreases the controllability of the airplane in event
of engine failure.
3. Flaps may be lowered at airspeeds up to 115 MPH. To
reduce flap operating loads, it is desirable to have the airplane
at a slower speed before extending the flaps.
4. Before attempting to reset any circuit breaker, allow a
two to five minute cooling off period.
5. Before starting the engine, check that all radio switches,
light switches, and the pitot heat switch are in the off position
so as not to create an overloaded condition when the starter is
engaged.
6. The overvoltage relay is provided to protect the elec-
tronics equipment from a momentary overvoltage condition (ap-
proximately 16.5 volts and up), or a catastrophic regulator failure.
In the event of a momentary condition, the relay will open and
the ammeter will indicate "0" output from the alternator. The
relay may be reset by switching the''ALT''switch to "OFF" for
approximately one second and then returning the "ALT" switch to
"ON."
7. The vacuum gauge is provided to monitor the pressure
available to assure the correct operating speed of the vacuum driven
gyroscopic flight instruments. It also monitors the condition of the
common air filter by measuring the flow of air thru the filter.
If the vacuum gauge does not register 5" + .1" Hg at 2000
RPM, the following items should be checked before flight:
a. Common air filter, could be dirty or restricted.
b. Vacuum lines could be collapsed or broken.
c. Vacuum pump, worn.
d. Vacuum regulator, not adjusted correctly. The pressure,
even though set correctly, can read lower under two conditions: (1)
Very high altitude, above 12000 feet, (2) Low engine RPM usually on
approach or during training maneuvers. This is normal and should not
be considered a malfunction.
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