SYSTEM DESCRIPTION (cont)
(2) Engine Exhaust Subsystem.
The engine exhaust subsystem directs and cools engine exhaust
gases and removes foreign particles from the engine. During engine operation, exhaust gas from the engine is
forced through the primary nozzle into the secondary nozzle. The flow of exhaust gas from the primary to the
secondary nozzle draws ambient (outside) air into the nacelle which creates an ejector pumping action. The
ambient air in the nacelle is drawn into the secondary nozzle which causes the air to mix with the exhaust gas as
it leaves the primary nozzle. The air mixing reduces the temperature of the exhaust gas and the remaining heat is
absorbed by the secondary exhaust nozzle. The fins on the secondary exhaust nozzle emits the remaining heat
which lowers the temperature of the exhaust gas leaving the nozzle. The air duct receives air and foreign particles
(if any) from the inlet particle separator (IPS) blower. The duct routes particles to the primary nozzle where it
mixes with the exhaust gas.
COOLING LOUVER ACTUATOR
Right Engine Cooling Louver Operation
ENGINE INLET AIR
Engine Cooling and Exhaust Operation