T
RAINING
M
ANUAL
–
L
ANCAIR
IV/IVP
air with a controlled quantity of unheated air to provide for the selected
temperature. This air may then be routed for cabin heat, windshield defrost, or a
combination of the two. Fresh ram air enters an intake on the right side of the
vertical tail. An electric blower fan and ducting routes this fresh ram air to four
overhead eyeball outlets. For ground operations, the blower maintains airflow
through the system. Each outlet can be positioned to direct the flow of air as
desired. A system shutoff valve is installed in the duct between the tail ram air
scoop and the individual fresh air outlets.
PRESSURIZED
The Lancair IV-P aircraft has a determined maximum pressure differential,
(5PSID) which is the maximum differential between cabin and ambient altitudes
that the pressurized section of the aircraft can support. Cabin pressurization is
the compression of air in the aircraft cabin to maintain a cabin altitude lower than
the actual flight altitude. At FL 250 and 5 psid the cabin altitude is maintained at
9,000’ MSL.
The pilot must be familiar with these limitations.
The cabin altitude can be manually selected and is monitored by a gauge, which
indicated the pressure difference between the cabin and ambient altitudes. The
rate of change between those two pressures is automatically controlled.
Compressed air is drawn from four calibrated sonic nozzles placed in the
induction system. One set of two is located prior to the main intercooler. They
supply hot pressurized air to the mixing or inflow valve.
‐
55
–
©
Copyright
2007
LOBO
May
not
be
copied
without
permission.