T-45C TS, ADV & IUT ENG-27/ENG-28
Engineering Review
(3) FCOC heat exchanger unit provides oil
Sg 2, fr 72
cooling through heat exchange with engine
FCOC
fuel and integrated FCOC bypass valve
ensures adequate engine lubrication under
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cold temperature conditions
FCOC Bypass Valve
(4) Oil filter: filters all oil entering engine and
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Filter
gearboxes
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(5) Distribution: oil distributed to engine
Distribution Block
and external gearbox
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Differential Pressure
(6) Oil differential switch signals centralized
Switch
warning system (CWS) if the differential oil
pressure drops below 10 psi, causing OIL
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PRESS warning light to illuminate
OIL PRESS Light
(7) Scavenge system three oil pumps
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scavenge and return oil to oil tank from
Scavenger Pumps
three distribution areas
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D.
Engine starting system: engine is started on ground or
Fig 5:
by assisted relight in flight via GTS and ATS
Engine Starting System
Block Diagram
1.
Starting system component function
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a.
GTS: gas turbine air producer unit
GTS
(1) GTS starter motor and GTS igniters
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GTS Starter Motor
powered by 28 VDC essential services bus
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(2) GTS fuel obtained from aircraft fuel system
GTS Fuel System
downstream from LP fuel shutoff valve
(3) Started by pressing GTS start button
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GTS Start Button
(a) When GTS reaches speed, a green
GTS advisory light illuminates
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GTS Advisory Light
(b) GTS accelerates to 100% for engine
starting when ENGINE start switch is
momentarily set to START
(9-98) Original
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