Environmental System - Piper Malibu PA-46-310P Pilot Operating Handbook

SECTION 7
DESCR/OP'4:RATION
PIPER AIRCRAFT CORPORATION
PA-46-310P, MALIBU
7.25 ENVIRONMENTAL SYSTEM
The environmental system consists of an engine bleed air and condi-
tioning system. cabin air distribution system, pressurization and control
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system, ventilating air system and optional air conditioning system.
The engine bleed air system provides the air supply for pressurizing the
cabin. Temperature of the bleed air is controlled using an air-to-air heat
exchanger which utilizes ambient air to cool the bleed air, hot air from
an
exhaust shroud to heat the bleed air, or a mixture of ambient and hot air
to
obtain the bleed air temperature necessary to maintain the desired cabin
comfort level.
The cabin air distribution system consists of left and right side panel
ducting, windshield defrost, footwarmer, and ventilation blowers. The side
panel ducts provide for overall air distribution throughout the length of the
cabin as well as individual controllable air outlets at each seat (eyeball
outlets). The defrost control will allow part of the bleed air to be diverted to
the windshield defrost outlet. Separate and individual controls for the two
footwarmcr outlets are also provided. The outlets are located between the
rudder pedals on each side of the cockpit. The ventilation blowers supply
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airflow to the portion of the side wall ducts containing the individual seat
outlets (eyeballs).
The cabin pressurization and control system consist of an outflow valve
(isobaric), safety valve, cabin altitude and rate selector, electrically operated
vacuum solenoid valve, surge tank and associated interconnecting plumbing
and wiring. Cabin altitude, differential pressure, and rate of change are
displayed on a single 3-inch diameter indicator. Pilot warning (displayed on
the annunciator panel) is provided to indicate a cabin altitude above 10,000
feet.
Cabin ventilating air for ground and unpressurized flight operation is
supplied from the ambient air source to the bleed air heat exchanger through
a ram air selector valve and check valve. A vane-axial blower is provided in
the left duct below the forward baggage floor. This will supplement air flow
primarily in ground operation. This air source is capable of being heated by
mixing with hot air from the exhaust shroud.
REPORT: VH-1200
7-32
ISSUED: JANUARY 11, 1984
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