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CHEROKEE CRUISER
OPERATING TIPS
The following Operating Tips are of particular value in the operation of the Cherokee 140.
1.
Learn to trim for takeoff so that only a very light back pressure on the wheel is
required to lift the airplane off the ground.
2.
The best speed for takeoff 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 electronics equipment from a
momentary overvoltage condition (approximately 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 1 second and then
returning the ALT switch to ON.
If
after recycling the ALT switch the condition
persists, the flight should be terminated as soon as practical; reduce the battery load
to a minimum. The ALT light on the annunciator panel* will illuminate if the
alternator fails. Recycle the ALT switch and check the ALT FIELD circuit breaker.
If
the failure persists after this action, reduce electrical loads and land as soon as
practical,
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 through the filter.
If the vacuum gauge does not register 5"
±
.10" 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 12,000 feet, (2) Low engine RPM, usually on approach or during
training maneuvers. This is normal and should not be considered a
malfunction.
*
Serial nos. 28-7525001 through 28-7625275
OPERATING TIPS
REVISED: JULY 13, 1984
8-1
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