*
SECTION
7
CESSNA
-
AIRPLANE AND SYSTEMS DESCRIPTION MODEL 2088
(675
SHP)
AIR INDUCTION SYSTEM
The engine air inlet is located at the front of the engine nacelle to the
f-
left of the propeller spinner. Ram air entering the inlet flows through
ducts and an inertial separator system and then enters the engine
,
.
through a circular plenum chamber where it is directed to the
compressor by guide vanes. The compressor air inlet incorporates a
screen which will prevent entry of large articles, but does not filter the
inlet air.
INERTIAL SEPARATOR SYSTEM
An inertial separator system in the engine air inlet duct prevents
,
~
moisture particles from entering the compressor air inlet plenum when
in bypass mode. The inertial separator consists of two movable vanes
,
.
and a fixed airfoil which, during normal operation, route the inlet air
through a gentle turn into the compressor air inlet plenum. When
separation of moisture particles is desired, the vanes are positioned so
that the inlet air is forced to execute a sharp turn in order to enter the
inlet plenum. This sharp turn causes any moisture particles to separate
from the inlet air and discharge overboard through the inertial separator
outlet in the
left side of the cowling.
Inertial separator operation is controlled by a T-handle located on the
lower instrument panel. The T-handle is labeled BYPASS-PULL,
NORMAL-PUSH. The inertial separator control should be moved to the
BYPASS position prior to running the engine during ground or flight
operation in visible moisture (clouds, rain, snow, ice crystals) with an
OAT of 5°C
(40°F)
or less. It mav also be used for ground operations or
takeoffs from dusty, sandy
f~elb condlt~ons to minlm~ze ingest~on of
fore
qn
panicles
Into the compressor. The normal pos~tlon 1s used for all
The T-handle locks in the NORMAL position by rotating the handle
clockwise
114
turn to its vertical position. To unlock, push forward
slightly and rotate the handle 90" counterclockwise. The handle can
then be pulled into the BYPASS position. Once moved to the BYPASS
position, air loads on the movable vanes hold them in this position.
NOTE
When moving the inertial separator control from BYPASS to
NORMAL position during flight, reduction of engine power
will reduce the control forces.
(Continued Next Page)
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Revision
23
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