T-45A UJPT, E2-C2, ADV, & IUT Eng-26
Engineering Review
E.
Bleed air system
1.
Internal airflow: continuous flow of
compressor air, used internally in engine
for:
a.
Pressurizing oil seals to prevent oil
bleeding into engine airflow and hot
gases from entering oil system
b.
Cooling
(1) Engine shafts and bearing thrust
loading
(2) Rear face of N2 turbine
(3) Both sides of N1 turbine
(4) N1 turbine vane
c.
Anti-icing intake spinner
2.
delivery air (P3), tapped from four areas on
engine case for
a.
On-board oxygen generation system
(OBOGS)
b.
Environmental control system (ECS)
and overboard engine bleed
c.
Fuel tank pressurization
d.
P1 probe anti-icing
3.
Engine bleed air valve; reduces engine load
during start
Page 26-13
(8-03) Original
Previous Page
