HYDS Flashcards
What systems( Actual other systems) do the three hydraulic pumps provide pressure to?
Flight control system, APU system, rescue hoist system
The hydraulic pumps are essential for various operational components in these systems.
What is the hydraulic pressure supplied by the hydraulic pumps / what’s actuators are the expectation to the rule?
-> Where are they located?
–> What’s there PSI?
Approximately 3,000 psi
The exception is the pitch and roll trim actuators in the pilot-assist servo assembly, which operate at 1,000 psi.
True or False: Each hydraulic system can operate independently of the others.
True
The systems are designed to be redundant and can function autonomously.
What does the Leak Detection/Isolation (LDI) system assist with?
Isolation of hydraulic leaks
This system plays a critical role in maintaining hydraulic integrity.
The HYD warning will illuminate when…
This indicates multiple compound malfunctions in the hydraulic systems.
What components make up the No. 1 hydraulic system?
- No. 1 hydraulic pump
- No. 1 transfer module
- First stage of the primary servos
- First stage of the tail rotor servo
The No. 1 hydraulic system is crucial for rotor operation.
What indicators are marked on the level-indicator window of the reservoir? AKA what are do the colors mean on the Hyd Pump
- Underserviced (red)
- Normal (green)
- Overserviced (blue)
These indicators help in monitoring hydraulic fluid levels.
What occurs when the automatic low-level sensing switch detects low fluid levels on the #1 side specifcally? ( Think Caution)
1 RSVR LOW caution appears
This alerts the operator to potential issues in the hydraulic system.
What does the No. 1 transfer module do?
Routes hydraulic fluid from the No. 1 hydraulic pump to servos
It ensures proper distribution of hydraulic fluid.
What happens if No. 1 hydraulic system pressure is lost / where does it go?
The transfer/shuttle valve routes backup pump hydraulic fluid
This maintains functionality of the servos.
What is the role of the pressure switch in the No. 1 transfer module?
Illuminates the #1 HYD PUMP caution and signals LDI
This is essential for monitoring system pressure.
What does the No. 2 hydraulic system supply hydraulic pressure to?
The second stage of the primary servos and the pilot-assist servo assembly
What are the main components of the No. 2 hydraulic system?
- No. 2 hydraulic pump
- No. 2 transfer module
- Second-stage primary servos
- Pilot-assist servo assembly
What happens when the fluid level is low in the No. 2 hydraulic pump? ( Think cautions)
2 RSVR LOW caution appears
What is the function of the No. 2 transfer module?
Routes hydraulic fluid from the No. 2 hydraulic pump to the second stage of the primary servos and the pilot-assist servo assembly
How can hydraulic pressure to the pitch and roll trim actuators be secured?
By depressing the TRIM pushbutton on the AFCS CONTROL panel
What hydraulic pressure is approximately secured to the pitch and roll trim actuators?
Approximately 1,000 psi
What hydraulic pressure is approximately secured to the boost servos and SAS actuators?
Approximately 3,000 psi
How is hydraulic pressure to the boost servos secured?
By depressing the SAS/BOOST pushbutton on the AFCS CONTROL panel
What is the function of the SERVO switches?
Secure hydraulic pressure to an improperly operating primary servo stage
There are two switches, one on each collective.
What happens when either 1ST OFF or 2ND OFF is selected?
The associated servo shutoff valve is energized closed and hydraulic pressure to the respective stage is secured.
What is the purpose of the electrical interlock?
Precludes the securing of hydraulic pressure to both first and second stages simultaneously.
The backup hydraulic system is what source to the rescue hoist system?
The only source of hydraulic pressure.
What occurs if the BACKUP PUMP PWR circuit breaker is out and the backup pump is needed?
The hydraulic system must be configured so that the backup pump will not activate upon resetting the circuit breaker.
