Piper Malibu PA-46-310P Pilot Operating Handbook page 131

PIPER AffiCRAFf CORPORATION
PA-46-310P, MALIBU
SECTION4
NORMAL PROCEDURES
The engine power setting table defines the cruise power at the desired
mixture setting of 50 lean of peak. Operation at the same manifold pressure
and a richer mixture setting will produce a higher horsepower, increased
engine temperatures and in the case of 75
%
power will exceed the approved
horsepower for leaning the engine. Do not operate the aircraft in cruise with a
mixture setting other than 50 lean of peak T.I. T.
For maximum service life, cylinder head temperature should be
maintained below 420F during cruise operation. If cylinder head
temperatures become too high during flight, reduce them by decreasing
power.
Following level-off for cruise, the pressurization system should be
checked.
The pilot should monitor weather conditions while flying, and be alert for
meteorological conditions which might lead to icing. Even aircraft equipped
with a complete deicing option are not approved for flight in heavy icing ,
heavy snow, or freezing rain. (See Section 9.) Immediate steps shall be taken
to exit any area where such icing conditions are inadvertently encountered.
Saturated air accelerating through the induction system filter can form ice
although ambient temperatures are above freezing. If induction system icing is
suspected, place the induction air control in the ALTERNATE position.
Alternate air should also be selected before entering clouds. Manifold pressure
may decrease significantly when alternate air is selected depending on altitude,
power setting, and other factors. This loss of manifold pressure can exceed 8
inches of Hg. when selecting alternate air at cruise power settings during icing
conditions. If ice is forming on the filter manifold pressure could continue to
deteriorate after selecting alternate air. When manifold pressure stabilizes
attempt to regain cruise power with throttle and or RPM adjustments. The
primary filter may retain ice after leaving icing conditions, making the
selection of PRIMARY induction air impractical until ice melts or sublimates.
During flight, keep account of time and fuel used in connection with
power settings to determine how the fuel flow and fuel quantity gauging
systems are operating.
There are no mechanical uplocks in the landing gear system. In the event
of a hydraulic system malfunction, check valves should prevent the gear
from extending. However, some hydraulic system malfunctions may cause
the gear to free-fall to the gear down position. The true airspeed with gear
down is approximately 70% of the gear retracted airspeed for any given
power setting. Allowances for the reduction in airspeed and range should be
made when planning extended flight between remote airfields or flight over
water.
In order to keep the airplane in best lateral trim during cruise flight,
fuel should be used alternately from each tank at one hour intervals or less.
ISSUED: JANUARY 11, 1984
REVISED: AUGUST 20, 1993
REPORT: VB-1200
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