Hydraulic Power System Flashcards
What is the main function of the NH90 Hydraulic System?
A) Cooling avionics
B) Generating hydraulic power for flight controls and utility circuits
C) Managing electrical distribution
D) Supplying fuel to the engines
B) Generating hydraulic power for flight controls and utility circuits
- How many independent hydraulic circuits does the NH90 have?
A) One
B) Two
C) Three
D) Four
B) Two
Which of the following is powered by the NH90 Hydraulic System?
A) Avionics cooling fans
B) Navigation systems
C) Flight control actuators
D) Fuel injection system
C) Flight control actuators
What is the role of the Power Control Modules (PCMs)?
A) Store excess hydraulic fluid
B) Distribute hydraulic supply and monitor system performance
C) Generate hydraulic pressure
D) Control the electrical system
B) Distribute hydraulic supply and monitor system performance
What is the pressure provided by the mechanical hydraulic pumps?
A) 150 bars
B) 197 bars
C) 207 bars
D) 250 bars
C) 207 bars
Which pump supplies hydraulic pressure to HS1 in normal mode?
A) Mechanical pump 1
B) Electrical pump
C) Mechanical pump 4
D) Mechanical pump 2
A) Mechanical pump 1
Where is the hydraulic control panel (HCP) located?
A) Cockpit center console
B) Overhead control panel
C) Tail boom
D) Engine compartment
B) Overhead control panel
What does the amber “TEMP” warning light indicate?
A) Hydraulic fluid pressure is low
B) Hydraulic fluid temperature exceeds 135°C
C) Hydraulic pumps are inactive
D) Hydraulic system is operating normally
B) Hydraulic fluid temperature exceeds 135°C
What component is responsible for recharging the wheel brake and deck lock accumulators?
A) Mechanical pump 2
B) Electrical pump
C) Ancillary pump
D) Hydraulic shut-off valve
C) Ancillary pump
How much hydraulic pressure does the electrical pump provide?
A) 150 bars
B) 197 bars
C) 207 bars
D) 250 bars
B) 197 bars
What is the purpose of the Utility Shut-Off Valve (UTIL SOV)?
A) Isolate the utility circuit in case of leaks
B) Control fuel flow to engines
C) Monitor hydraulic pressure in circuit 1
D) Power the avionics
A) Isolate the utility circuit in case of leaks
What is the function of the Hydraulic Ground Power Unit (HGPU)?
A) Provide power to avionics
B) Store excess hydraulic pressure
C) Supply hydraulic power for system tests and maintenance
D) Control the flight control actuators
C) Supply hydraulic power for system tests and maintenance
What is the full capacity of PCM1’s hydraulic reservoir?
A) 2.00 liters
B) 3.00 liters
C) 7.00 liters
D) 10.00 liters
B) 3.00 liters
What is the purpose of the Hydraulic Swivel Manifolds (HSM)?
A) Prevent hydraulic fluid overheating
B) Supply the tail rotor actuator with hydraulic pressure
C) Regulate hydraulic flow to the main rotor
D) Store excess hydraulic fluid
B) Supply the tail rotor actuator with hydraulic pressure
What happens when the fluid level in PCM2 reaches the minimum threshold (1.2L)?
A) The system automatically shuts down
B) The UTIL SOV closes to preserve remaining hydraulic fluid
C) The pilot must manually shut down the system
D) The system switches to backup mode
B) The UTIL SOV closes to preserve remaining hydraulic fluid
What is the function of the Shut-Off Valves (SOV1 and SOV2)?
A) Increase hydraulic pressure
B) Isolate hydraulic circuits in case of failure
C) Activate the auxiliary hydraulic pump
D) Control the cooling system
B) Isolate hydraulic circuits in case of failure
Where is the electrical hydraulic pump located?
A) Inside the cockpit
B) Near the landing gear
C) In front of the MGB, between the PCMs
D) Inside the engine compartment
C) In front of the MGB, between the PCMs
What is the purpose of the amber hatched area on the electrical pump push button?
A) Indicates the pump is deactivated
B) Shows a pressure loss in the system
C) Signals that the electrical pump is running
D) Alerts the crew of system overheating
C) Signals that the electrical pump is running
Which hydraulic pump is driven by the Auxiliary Power Unit (APU)?
A) Pump 1
B) Pump 2
C) Pump 4
D) Electrical pump
C) Pump 4
What component prevents fluid loss when disconnecting hydraulic lines?
A) Hydraulic accumulator
B) Quick disconnect couplings
C) Pressure relief valve
D) Hydraulic reservoir
B) Quick disconnect couplings
What is the minimum pressure required for the hydraulic system to operate flight controls?
A) 100 bars
B) 135 bars
C) 162 bars
D) 207 bars
C) 162 bars
How long does it take for the electrical pump to activate after pressing its switch?
A) 2 seconds
B) 5 seconds
C) 10 seconds
D) 20 seconds
C) 10 seconds
What does the “F/C P” warning light indicate?
A) Flight control pressure loss
B) Overheated hydraulic fluid
C) Electrical system failure
D) Fuel pressure anomaly
A) Flight control pressure loss
What happens if hydraulic pressure in system 2 drops below 162 bars?
A) SOV1 and the T/R SOV automatically open to re-pressurize the system
B) The entire hydraulic system shuts down
C) The tail rotor actuator stops working
D) The landing gear remains locked in position
A) SOV1 and the T/R SOV automatically open to re-pressurize the system
What is the maximum pressure for the hydraulic system?
A) 150 bars
B) 197 bars
C) 207 bars
D) 250 bars
C) 207 bars
