T
RAINING
M
ANUAL
–
L
ANCAIR
IV/IVP
IO-550
The IO-550 develops 300 horsepower at full throttle, 29.6 in. Hg., and 2700 rpm.
A cruise climb setting of 2500 rpm and full throttle initially yields 240 horsepower,
but power available will start decreasing after approximately 6,000 feet MSL.
The engine driven altitude compensating fuel pump will automatically lean engine
mixture for the airplane’s pressure altitude, so manual leaning is not necessary
until cruise altitude is reached. The manual mixture control also provides for idle
cut-off. A Dukes auxiliary boost pump is installed. The low-pressure position is
used for suppression of vapor at altitude. The high-pressure pump position is
used as a primer or as an emergency source for fuel pressure. The engine oil
system is the full pressure, wet sump type and it has a 12-quart capacity
PROPELLER
The engine drives a two, three, or four bladed constant speed propeller. A
governor, controlled by mechanical linkage from the cockpit, maintains the
selected rpm, regardless of varying airspeeds or flight loads. The governor
controls rpm by regulating oil pressure to the propeller hub. Propeller high pitch
(low rpm) is obtained by propeller governor boosted oil pressure working against
the centrifugal twisting moment of the blades and a spring. Loss of oil pressure
will cause the prop to go to high rpm and thus possible overspeed. The propeller
should be cycled occasionally, especially during cold conditions, to maintain
warm oil in the hub.
FLIGHT CONTROLS
The primary flight controls are the ailerons, rudder, and elevator. These control
surfaces are operable from either front seat by interconnected side stick controls
and rudder pedals. On the LIVP the controls run through the pressure bulkheads
to the non pressurized side of the cabin. A pressure compensator is used on
older used to compensate for the effects of an expanding cabin.
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©
Copyright
2007
LOBO
May
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permission.