T-45A UJPT, E2-C2, ADV, & IUT Eng-02
Engine
(5) Distribution: oil distributed to
Overlay 5
engine turbine bearings, engine
Distribution Block
internal gearbox, and external
gearbox
(6) Oil differential pressure switch
Overlay 6
Differential Switch
(a) Measures pressure differential
between internal gearbox oil
feed and internal gearbox
scavenge oil
(b) Signals centralized warning
Overlay 7
system (CWS) if the
differential oil pressure drops
WarningLight
SUCTION OIL
OILPRESS
PRESSURE OIL
BYPASSOIL
INTERNAL
below 10 psi, causing OIL
GEARBOX
RETURN OIL
VENT AIR
DIFF
DIST
SWITCH
BLOCK
TURBINE
PRESS warning light to
REAR
O
F
illuminate
ENGINE
FILTER
PUMPS
PUMP
FCOC
OIL
TANK
BYP
FRONT
OF
(c) Incorporates a 10-second
ENGINE
EXTERNAL
GEARBOX
OIL SYSTEM
delay to avoid signaling
OIL PRESS WARNING LIGHT
transient pressures
NOTE: Momentary illumination of
the OIL PRESS warning light is
acceptable under positive g flight
following a period of zero or
negative g. This is caused by
system pressure recovery, which
may take up to six seconds.
NOTE: Loss of oil pressure will
result eventually in engine seizure.
If more than idle rpm is needed,
the optimum setting is 80 to 85
percent. Engine seizure is
delayed by: minimizing rpm,
minimizing throttle movements,
maintaining 1 g flight. OIL PRESS
may be accompanied by vibration
associated with bearing failure
which may lead to engine seizure.
(8-03) Original
Page 2-17
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