Service manual

SECTION 7
DESCR/OPERATION PA-46-350P, MALIBU
SECTION 7
DESCR/OPERATION PA-46-350P, MALIBU
REPORT: VB-1710 ISSUED: FEBRUARY 23, 1999
7-48 REVISED: SEPTEMBER 20, 1999
REPORT: VB-1710 ISSUED: FEBRUARY 23, 1999
7-48 REVISED: SEPTEMBER 20, 1999
7.25 ENVIRONMENTAL SYSTEM (Refer to Figure 7-43)
The environmental system consists of:
(a) A compressor bleed air and conditioning system.
(b) The ventilating air system.
(c) A supplemental electric cabin heater.
(d) An air conditioning system.
(e) The cabin air distribution system.
(f) The pressurization and control system.
Switches and push-pull knobs used to control and regulate the various
systems except the pressurization system are located on the right switch panel
above the right radio stack.
Compressor bleed air from the engine turbochargers supplies air for
heating the cabin during flight and ground operations and for pressurization.
The bleed air is first routed through an air-to-air heat exchanger, and then into
the cabin through the lower left and right cabin side panel ducts. The heat
exchanger utilizes ambient ram air to cool the bleed air, or hot air from an
exhaust shroud to heat the bleed air. Desired cabin comfort is maintained by
using the CABIN TEMP push-pull knob to manually adjust a flapper type
control valve located forward of the firewall. The position of this valve will
allow ambient air, or hot air, or a mixture of both, to enter the heat exchanger.
The cabin pressurization system isobaric outflow valve provides the
means by which smoke and impurities are vented from the cabin.
Cabin ventilating air during ground or unpressurized low altitude flight
operations is provided by the ambient ram air source to the bleed air heat
exchanger. An electric vane-axial ventilation/defog blower, located in the
left cabin air inlet duct below the forward baggage compartment floor, is
used to produce an air flow to the windshield defogger, and to supplement
the inflow of ventilating air during ground operations. The blower is
activated by selecting the VENT/DEFOG switch ON. Incoming ventilating
air can be heated by mixing it with hot air from the exhaust shroud.
NOTE
If electric supplemental heat is not used,
maximum cabin heat for ground operations and
unpressurized low altitude flight will be obtained
with the CABIN PRESS control full out.
7.25 ENVIRONMENTAL SYSTEM (Refer to Figure 7-43)
The environmental system consists of:
(a) A compressor bleed air and conditioning system.
(b) The ventilating air system.
(c) A supplemental electric cabin heater.
(d) An air conditioning system.
(e) The cabin air distribution system.
(f) The pressurization and control system.
Switches and push-pull knobs used to control and regulate the various
systems except the pressurization system are located on the right switch panel
above the right radio stack.
Compressor bleed air from the engine turbochargers supplies air for
heating the cabin during flight and ground operations and for pressurization.
The bleed air is first routed through an air-to-air heat exchanger, and then into
the cabin through the lower left and right cabin side panel ducts. The heat
exchanger utilizes ambient ram air to cool the bleed air, or hot air from an
exhaust shroud to heat the bleed air. Desired cabin comfort is maintained by
using the CABIN TEMP push-pull knob to manually adjust a flapper type
control valve located forward of the firewall. The position of this valve will
allow ambient air, or hot air, or a mixture of both, to enter the heat exchanger.
The cabin pressurization system isobaric outflow valve provides the
means by which smoke and impurities are vented from the cabin.
Cabin ventilating air during ground or unpressurized low altitude flight
operations is provided by the ambient ram air source to the bleed air heat
exchanger. An electric vane-axial ventilation/defog blower, located in the
left cabin air inlet duct below the forward baggage compartment floor, is
used to produce an air flow to the windshield defogger, and to supplement
the inflow of ventilating air during ground operations. The blower is
activated by selecting the VENT/DEFOG switch ON. Incoming ventilating
air can be heated by mixing it with hot air from the exhaust shroud.
NOTE
If electric supplemental heat is not used,
maximum cabin heat for ground operations and
unpressurized low altitude flight will be obtained
with the CABIN PRESS control full out.
FOR REFERENCE ONLY
NOT FOR FLIGHT