T-45C TS, ADV & IUT ENG-09
Sg 10, fr 2/3
The T-45C has two hydraulic systems (HYD 1 and HYD 2) which
operate independently of one another to power the flight controls.
Additionally, HYD 1 powers general services. HYD 1 is the larger
of the two and provides hydraulic power to the flight controls
(ailerons and stabilator) and general services (flaps, slats, speed
brakes, NWS, landing gear/gear doors, wheel/parking brakes,
launch bar, arresting hook). HYD 2 supplies hydraulic power to
the flight controls and emergency package assembly.
Both systems are powered by EDPs that produce a constant
output pressure of 3000 psi. If either system fails, the other
system has enough hydraulic power to operate the flight controls.
Additionally, the Emergency Hydraulic System acts as a backup to
HYD 2 if the HYD 2 EDP is unable to maintain sufficient
pressure. Because the RAT is not designed to provide constant
pressure levels, control responses may be sluggish if only the
RAT is operating. If HYD 2 fails, HYD 1 will of course maintain
pressure to the flight controls and the general services. However,
if HYD 1 fails, HYD 2 is designed to power only the flight controls.
The general services will rely on emergency backup systems, if
Because output pressure in both hydraulic systems is
continuously monitored, a malfunction in the hydraulic system
is relayed to the CWS, which then causes the MASTER ALERT
light to flash, sounds either the warning or caution tone, and
illuminates the appropriate warning/caution lights on the Warning
and caution advisory panels.
Cockpit controls and indicators include the HYD 1 and HYD 2
pressure gauges, the BRAKE pressure gauge, the the HYD 2
RESET button, and the following warning and caution lights on
the WCP: HYD 1, HYD 2, RAT, and HYD FAIL. Additionally,
there are several indicators on the exterior of the aircraft (the
wheel brake/emergency flap accumulator pressure gauge, HYD 1/
HYD 2 FC accumulator pressure gauges, HYD 1/HYD 2 filter
indicators, and the HYD 1/HYD 2 reservoir indicators.