-.
SECTION 7 CESSNA
AIRPLANE AND SYSTEMS DESCRIPTION MODEL
2088
(675
SHP)
ENGINE ACCESSORIES
(Continued)
OIL
BREATHER DRAIN CAN
,
-
Some Model 2088 airplanes have an oil breather drain can mounted on
the right lower engine mount truss. This can collects any engine oil
discharge coming from the accessory pads for the alternator drive
pulley,
starterlgenerator, air conditioner compressor (if installed), and
the propeller shaft seal. This can should be drained after every flight. A
drain valve on the bottom right side of the engine cowling enables the
pilot to drain the contents of the oil breather drain can into a suitable
container. The allowable quantity of oil discharge per hour of engine
operation is
14
cc for airplanes with air conditioning and
11
cc for
airplanes without air conditioning. If the quantity of oil drained from the
can is greater than specified, the source of the leakage should be
identified and corrected prior to further flight.
PROPELLER
The airplane may be equipped with either a Hartzell, composite
material, three-bladed propeller or a
McCauley aluminum material,
three-bladed propeller. Both propellers are constant-speed,
full-
feathering, reversible, single-acting, governor-regulated propellers.
With either propeller, a setting introduced into the governor with the
propeller control lever establishes the propeller speed. The propeller
utilizes oil pressure which opposes the force of springs and counter-
we~ghts to obtaln correct p~tch for the englne load
0.1
pressure from the
propeller governor
drlves the blades toward low pltch (increases RPM)
wnile tne springs and counterweights drive the blades toward hlgh pitch
(decreas.ng RPM). Tne source of oil pressure for propeller operation is
furnished
by
the engine oil system, boosted in pressure by the governor
gear pump, and supplied to the propeller hub through the propeller
flange.
To feather the propeller blades, the propeller control lever on the control
pedestal is placed in the FEATHER position; counterweights and spring
tension will continue to twist the propeller blades through high pitch and
into the streamlined or feathered position. Unfeathering the propeller is
accomplished by positioning the propeller control lever forward of the
feather gate. The unfeathering system uses engine oil pressure to force
the propeller out
of
feather.
(Continued Next Page)
1
7-68 U.S.
Revision 23
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