T-45C TS, ADV & IUT ENG-27/ENG-28
Engineering Review
E.
Bleed air system
1.
Internal air flow: continuous flow of compressor air,
used internally in engine for
a.
Pressurizing oil seals to prevent oil bleeding
into engine air flow and hot gases from entering
oil system
b.
Cooling
(1) Engine shafts and bearing thrust loading,
N2 turbine, and N1 turbine
c.
Anti-icing intake spinner
2.
air (P3), tapped from four areas on engine case for
a.
On-board oxygen generating system (OBOGS)
b.
Environmental control system (ECS) and
overboard engine bleed
c.
Fuel tank pressurization
d.
P1 probe anti-icing
F.
Bleed air vents: two bleed valves that have significant
effects on engine operation, one functions during engine
start, and the other functions during catapult launch
1.
The engine bleed valve relieves pressure from N2
compressor during engine start and prevents N1
compressor stalls (approx. 25% loss of thrust)
2.
A steam ingestion bleed valve vents additional bleed
air from the N2 during (approx. 10% loss of thrust)
a.
Catapult launch to preclude compressor surge
due to steam ingestion
(9-98) Original
Page 27-30
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