T-45C TS, ADV & IUT ENG-09
Question 2 220.127.116.11.1, 18.104.22.168
What information do the HYD 1, HYD 2, and BRAKE
pressure gauges provide and what should they display
when the hydraulic system is functioning normally?
1. HYD 1 indicates HYD 1 system pressure as provided by
the HYD 1 EDP. If HYD 1 is functioning normally, it should
indicate 3000 psi.
2. HYD 2 indicates HYD 2 system pressure as provided by
the HYD 2 EDP or the Emergency Hydraulic System. If
HYD 2 EDP is functioning normally, it should indicate
3000 psi. If the emergency hydraulic system is functioning
normally, it should fluctuate between 2500 and 3000 psi.
3. BRAKE indicates the nitrogen preload pressure in the
wheel brake/emergency flap accumulator. If the
accumulator is functioning normally, it should indicate 3000
psi when HYD 1 is operating and approximately 2800 psi
when the engine is shut down.
Sg 11, fr 2
* T-45C hydraulic system
* Hydraulic system no. 1 (HYD 1)
Electrical system: all Warnig and caution advisory
* Hydraulic system no. 2 (HYD 2)
panels lights, HYD 2 RESET button, and system
* Emergency hydraulic system
solenoid valves supplied by 28 VDC essential
Sg 11, fr 3, p 1
Engine accessory gearbox: provides mechanical
power to drive two hydraulic pumps
System Block Diagram
Flight controls supplied continuously