Hydraulic System Flashcards
What controls each of the hydraulic sytems.
Each hydraulic system has one HMC (Hydraulic Monitor & Control) to provide monitoring and control.
What differences exist between the Green and Yellow hydraulic generation systems?
The two systems are identical for generation.
What is the purpose of the hyraulic FSOV?
How many are there?
The FSOV isolates the reservoir from the pump.
There are two per engine, one per hydraulic sytem.
How many hydraulic reservoirs are there?
There are two reservoirs, one per system.
When do the FSOVs close?
The FSOV closes when:
- The ENG FIRE p/b is pressed
- The ENG SUPPLY p/b is pressed
If the FSOV is closed in flight, how is it reopened?
The FSOV requires maintenance action on the ground to be reopened.
What is the consequence of losing one hydraulic pump on a system?
Landing gear retraction time is longer than normal.
Other sytems operate normally.
How many electric hydraulic pumps are there?
There is one electric hydraulic pump per system.
When can the electric pump be used?
One the ground only with the engines off.
The motor requires a fixed 400hz frequency and must be disconnected from the bus when engines operate due to the frequency wild output of the main engine generators.
Which hydraulic system operates cargo doors?
The Yellow system operates cargo doors.
What are the two main parts of the HMC?
The HMCs comprise of:
- HMCA (Hydraulic Monitoring and Control Application) for control and monitoring functions plus interfaces to most systems.
- HMCRF (Hydraulic Monitoring and Control Remote Functions) for conversion of analogue/discrete signals for sytem use.
How many hydraulic oil/fuel heat exchangers are there?
Two per system, one each system per wing tank.
Which system controls the inboard ailerons?
The Yellow system.
Which system controls the outboard ailerons?
The Green or Yellow systems.
Which system controls spoilers 1,2,5 and 7?
The Yellow system.
What does this symbol mean on the HYD SD page?
The FSOV is open.
What does this symbol mean on the HYD SD page?
The FSOV valve is closed.
Associated with one of the following ECAM alert:
- ENG 1(2) FIRE
- HYD G(Y) RSVR OVHT
- HYD ENG 1(2) G(Y) PMP FAULT
What does this symbol mean on the HYD SD page?
The FSOV valve is set to close but remains abnormally open.
What does this symbol mean on the HYD SD page?
The EDP is on and the pressure is normal.
What does this symbol mean on the HYD SD page?
The EDP is automatically depressurized due to a fuel low level in a wing tank.
The automatic depressurization can occur in the case of fuel low level in a wing fuel tank and if the temperature of one hydraulic RSVR is above 80 °C.
In this case one EDP per hydraulic system (GREEN and YELLOW) is automatically depressurized to minimize heat injection into the hydraulic system.
However before landing or in the case of high hydraulic consumers demand, the depressurized EDP is automatically running.
What does this symbol mean on the HYD SD page?
The EDP is manually depressurized and ENG 1(2) PUMP pb-sw is OFF or is automatically depressurized due to high temperature.
When an abnormal temperature is detected in one EDP, the ECAM alert HYD ENG 1(2) G(Y) PMP FAULT is triggered and the EDP is automatically depressurized until the end of the flight.
What does this symbol mean on the HYD SD page?
Next The EDP is set to OFF but remains abnormally pressurized.
What does this symbol mean on the HYD SD page?
The EDP is running, and a low hydraulic pressure is detected.
Associated with the following ECAM alert: HYD ENG 1(2) G(Y) PMP PRESS LO
What does this symbol mean on the HYD SD page?
The EDP is running, and a high hydraulic pressure is detected.
Associated with the following ECAM alert: HYD ENG 1(2) G(Y) PMP FAULT
What does this symbol mean on the HYD SD page?
The pump is manually disconnected from the engine accessory gearbox, via the mechanical declutch mechanism.
What does this symbol mean on the HYD SD page?
The engine is running.
What does this symbol mean on the HYD SD page?
The engine is not running.
What does this symbol mean on the HYD SD page?
The elctric pump is failed and automatically set to off.
What does this symbol mean on the HYD SD page?
The electric pump is failed and manually set to off.
What does this symbol mean on the HYD SD page?
The elec pump is running with the p/b set to on.
What does this symbol mean on the HYD SD page?
The elec pump is running in automatic mode.
What does this symbol mean on the HYD SD page?
These are system pressure and label icons.
One shows a normal system pressure (green)
One shows abnormal system pressure (amber)
