Cessna 208B - Engine Malfunctions; Fuel Control Unit Malfunction in the Pneumatic or Governor Sections; Lossofoilpressure

CESSNA
MODEL 208B (675 SHP)
ENGINE MALFUNCTIONS
SECTION 3
EMERGENCYPROCEDURES
LOSS OF OIL PRESSURE
The complete loss of oil pressure, as evidenced by the low oil pressure
annunciator being illuminated and confirmed by the oil pressure gage
reading, implies that the pilot will eventually lose control of the propeller
as the propeller springs and counterweights drive the propeller blades
into feather. Also, the engine will eventually seize. Therefore, if the pilot
elects to continue to operate the engine afler loss of oil pressure,
engine and propeller operation should be closely monitored for
indication of the onset of propeller feathering or engine seizure and the
engine failure checklist should be completed at that time.
Operation of the engine at a reduced power setting (preferably at the
minimum power required for the desired flight regime) will generally
prolong the time to loss of enginelpropeller thrust.
Operation of the engine with the oil pressure in the yellow arc is not
considered critical, but is a cause for concern and should be tolerated
onlv for the
com~letion of the fliaht. Continued monitorino of the oil
pr&sure gage wiil provide an eaTy indication of dropping oil pressure
due to insufficient oil supply or a malfunctioning oil pump, and will give
the
p~lot additional time to divert to a suitable emergency landng area
-.
with'the engine operating.
.
FUEL CONTROL UNIT MALFUNCTION IN THE
PNEUMATIC OR GOVERNOR SECTIONS
-,
A malfunction in the pneumatic or governor sections of the fuel control
*,
unit may cause engine power to decrease to minimum flow idle.
Symptoms of this type of failure would be an ITT indication in the typical
1 idle range of 500°C to 600°C, N of 48% or above (increases with
alt~tude), and no engine response 8 power lever movement. If this type
*
of malfunction has occurred, the emergency power lever (fuel control
manual override) may be used to restore engine power. To use the
%,
manual override system, place the power lever at its IDLE position and
move the emergency power lever forward of its IDLE gate and advance
as required.
(Continued Next Page)
-3
I Revision 23
U.S. 3-37