Piper Cherokee Arrow II Pilots Operating Manual page 158

ARROW
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13. 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" Hg f .lo" 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.
1 4 . The shape of the wing fuel tanks is such that in certain maneuvers the fuel may move
away from the tank outlet. If the outlet is uncovered, the fuel will be interrupted and
a temporary loss of power may result. Pilots can prevent inadvertent uncovering of
the outlet by avoiding maneuvers which could result in uncovering the outlet.
Extreme running turning takeoffs should be avoided as fuel flow interruption
may occur.
Prolonged slips or skids which result in excess of 2000 feet of altitude loss, or
other radical or extreme maneuvers which could cause uncovering of the fuel outlet
must be avoided as fuel flow interruption may occur when tank being used is not full.
15. T h e rudder pedals are suspended from a torque tube which extends across the
fuselage. The pilot should become familiar with the proper positioning of his feet on
the rudder pedals so as to avoid interference with the torque tube when moving the
rudder pedals or operating the toe brakes.
16. Anti-collision lights should not be operating when flying through overcast and clouds,
since reflected light can produce spacial disorientation. Do not operate strobe lights
when taxiing in the vicinity of other aircraft.
1 7 . In an effort to avoid accidents, pilots should obtain and study the safety related
information made available in FAA publications such as regulations, advisory
circulars, Aviations News, AIM and safety aids.
OPERATING TIPS
REVISED: DECEMBER 8,1975