T-45C TS, ADV & IUT ENG-09
Hydraulic System
C.
HYD 1 operational characteristics 1.4.8.2.1
Sg 2, fr 7, p 1
Hydraulic System Block
1.
Input power: supplied by EDP
Diagram (5 Overlays)
a.
EDP receives hydraulic fluid from HYD 1
reservoir under low pressure
b.
EDP produces output of 3000 psi
c.
Pressure switch senses output pressure and
provides HYD 1 failure signal to centralized
warning system (CWS) to illuminate HYD 1
caution light when pressure drops below
Overlay 1
HYD 1
1660 + 110 psi (after AFC-244), or below
Caution Light
600 + 50 psi (before AFC-244). When HYD 1
pressure rises above 2000 psi (after AFC-244),
or above 725 + 50 psi (before AFC-244), HYD 1
caution light goes out
Overlay 2
Power Supply Package
2.
Output distribution: controlled by FC priority valve
(PSP)
Overlay 3
a.
Output of EDP is applied to power supply
FC Priority Valve
package
(PSP) Output
Distribution
b.
FC priority valve normally supplies hydraulic
pressure to both FC services and general
services distribution
Overlay 4
FC Services
c.
Flight control services
(1) Left and right aileron power control units
(PCUs): tandem hydraulic cylinders, one
side supplied by HYD 1 and other by HYD 2
(HYD 1 supplies forward side of aileron
PCUs; HYD 2 supplies aft side)
(2) Stabilator PCU (also a tandem PCU)
Overlay 5
General Services
(3) System redundant with HYD 2
d.
General services
(9-98) Change 4
Page 9-11
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